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mac80211: check power constraint IE size when parsing
[linux-2.6.git] / net / mac80211 / util.c
blobed7543960b16b4574ab8032415636182493d231b
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * utilities for mac80211
12 */
13
14 #include <net/mac80211.h>
15 #include <linux/netdevice.h>
16 #include <linux/export.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/etherdevice.h>
21 #include <linux/if_arp.h>
22 #include <linux/bitmap.h>
23 #include <linux/crc32.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26 #include <net/rtnetlink.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wme.h"
33 #include "led.h"
34 #include "wep.h"
35
36 /* privid for wiphys to determine whether they belong to us or not */
37 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
38
39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
40 {
41 struct ieee80211_local *local;
42 BUG_ON(!wiphy);
43
44 local = wiphy_priv(wiphy);
45 return &local->hw;
46 }
47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
48
49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
50 enum nl80211_iftype type)
51 {
52 __le16 fc = hdr->frame_control;
53
54 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
55 if (len < 16)
56 return NULL;
57
58 if (ieee80211_is_data(fc)) {
59 if (len < 24) /* drop incorrect hdr len (data) */
60 return NULL;
61
62 if (ieee80211_has_a4(fc))
63 return NULL;
64 if (ieee80211_has_tods(fc))
65 return hdr->addr1;
66 if (ieee80211_has_fromds(fc))
67 return hdr->addr2;
68
69 return hdr->addr3;
70 }
71
72 if (ieee80211_is_mgmt(fc)) {
73 if (len < 24) /* drop incorrect hdr len (mgmt) */
74 return NULL;
75 return hdr->addr3;
76 }
77
78 if (ieee80211_is_ctl(fc)) {
79 if(ieee80211_is_pspoll(fc))
80 return hdr->addr1;
81
82 if (ieee80211_is_back_req(fc)) {
83 switch (type) {
84 case NL80211_IFTYPE_STATION:
85 return hdr->addr2;
86 case NL80211_IFTYPE_AP:
87 case NL80211_IFTYPE_AP_VLAN:
88 return hdr->addr1;
89 default:
90 break; /* fall through to the return */
91 }
92 }
93 }
94
95 return NULL;
96 }
97
98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
99 {
100 struct sk_buff *skb;
101 struct ieee80211_hdr *hdr;
102
103 skb_queue_walk(&tx->skbs, skb) {
104 hdr = (struct ieee80211_hdr *) skb->data;
105 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
106 }
107 }
108
109 int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
110 int rate, int erp, int short_preamble)
111 {
112 int dur;
113
114 /* calculate duration (in microseconds, rounded up to next higher
115 * integer if it includes a fractional microsecond) to send frame of
116 * len bytes (does not include FCS) at the given rate. Duration will
117 * also include SIFS.
118 *
119 * rate is in 100 kbps, so divident is multiplied by 10 in the
120 * DIV_ROUND_UP() operations.
121 */
122
123 if (band == IEEE80211_BAND_5GHZ || erp) {
124 /*
125 * OFDM:
126 *
127 * N_DBPS = DATARATE x 4
128 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
129 * (16 = SIGNAL time, 6 = tail bits)
130 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
131 *
132 * T_SYM = 4 usec
133 * 802.11a - 17.5.2: aSIFSTime = 16 usec
134 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
135 * signal ext = 6 usec
136 */
137 dur = 16; /* SIFS + signal ext */
138 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
139 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
140 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
141 4 * rate); /* T_SYM x N_SYM */
142 } else {
143 /*
144 * 802.11b or 802.11g with 802.11b compatibility:
145 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
146 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
147 *
148 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
149 * aSIFSTime = 10 usec
150 * aPreambleLength = 144 usec or 72 usec with short preamble
151 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
152 */
153 dur = 10; /* aSIFSTime = 10 usec */
154 dur += short_preamble ? (72 + 24) : (144 + 48);
155
156 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
157 }
158
159 return dur;
160 }
161
162 /* Exported duration function for driver use */
163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
164 struct ieee80211_vif *vif,
165 enum ieee80211_band band,
166 size_t frame_len,
167 struct ieee80211_rate *rate)
168 {
169 struct ieee80211_sub_if_data *sdata;
170 u16 dur;
171 int erp;
172 bool short_preamble = false;
173
174 erp = 0;
175 if (vif) {
176 sdata = vif_to_sdata(vif);
177 short_preamble = sdata->vif.bss_conf.use_short_preamble;
178 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
179 erp = rate->flags & IEEE80211_RATE_ERP_G;
180 }
181
182 dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
183 short_preamble);
184
185 return cpu_to_le16(dur);
186 }
187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
188
189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
190 struct ieee80211_vif *vif, size_t frame_len,
191 const struct ieee80211_tx_info *frame_txctl)
192 {
193 struct ieee80211_local *local = hw_to_local(hw);
194 struct ieee80211_rate *rate;
195 struct ieee80211_sub_if_data *sdata;
196 bool short_preamble;
197 int erp;
198 u16 dur;
199 struct ieee80211_supported_band *sband;
200
201 sband = local->hw.wiphy->bands[frame_txctl->band];
202
203 short_preamble = false;
204
205 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
206
207 erp = 0;
208 if (vif) {
209 sdata = vif_to_sdata(vif);
210 short_preamble = sdata->vif.bss_conf.use_short_preamble;
211 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
212 erp = rate->flags & IEEE80211_RATE_ERP_G;
213 }
214
215 /* CTS duration */
216 dur = ieee80211_frame_duration(sband->band, 10, rate->bitrate,
217 erp, short_preamble);
218 /* Data frame duration */
219 dur += ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
220 erp, short_preamble);
221 /* ACK duration */
222 dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
223 erp, short_preamble);
224
225 return cpu_to_le16(dur);
226 }
227 EXPORT_SYMBOL(ieee80211_rts_duration);
228
229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
230 struct ieee80211_vif *vif,
231 size_t frame_len,
232 const struct ieee80211_tx_info *frame_txctl)
233 {
234 struct ieee80211_local *local = hw_to_local(hw);
235 struct ieee80211_rate *rate;
236 struct ieee80211_sub_if_data *sdata;
237 bool short_preamble;
238 int erp;
239 u16 dur;
240 struct ieee80211_supported_band *sband;
241
242 sband = local->hw.wiphy->bands[frame_txctl->band];
243
244 short_preamble = false;
245
246 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
247 erp = 0;
248 if (vif) {
249 sdata = vif_to_sdata(vif);
250 short_preamble = sdata->vif.bss_conf.use_short_preamble;
251 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
252 erp = rate->flags & IEEE80211_RATE_ERP_G;
253 }
254
255 /* Data frame duration */
256 dur = ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
257 erp, short_preamble);
258 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
259 /* ACK duration */
260 dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
261 erp, short_preamble);
262 }
263
264 return cpu_to_le16(dur);
265 }
266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
267
268 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
269 {
270 struct ieee80211_sub_if_data *sdata;
271 int n_acs = IEEE80211_NUM_ACS;
272
273 if (local->hw.queues < IEEE80211_NUM_ACS)
274 n_acs = 1;
275
276 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
277 int ac;
278
279 if (!sdata->dev)
280 continue;
281
282 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
283 continue;
284
285 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
286 local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
287 continue;
288
289 for (ac = 0; ac < n_acs; ac++) {
290 int ac_queue = sdata->vif.hw_queue[ac];
291
292 if (ac_queue == queue ||
293 (sdata->vif.cab_queue == queue &&
294 local->queue_stop_reasons[ac_queue] == 0 &&
295 skb_queue_empty(&local->pending[ac_queue])))
296 netif_wake_subqueue(sdata->dev, ac);
297 }
298 }
299 }
300
301 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
302 enum queue_stop_reason reason)
303 {
304 struct ieee80211_local *local = hw_to_local(hw);
305
306 trace_wake_queue(local, queue, reason);
307
308 if (WARN_ON(queue >= hw->queues))
309 return;
310
311 if (!test_bit(reason, &local->queue_stop_reasons[queue]))
312 return;
313
314 __clear_bit(reason, &local->queue_stop_reasons[queue]);
315
316 if (local->queue_stop_reasons[queue] != 0)
317 /* someone still has this queue stopped */
318 return;
319
320 if (skb_queue_empty(&local->pending[queue])) {
321 rcu_read_lock();
322 ieee80211_propagate_queue_wake(local, queue);
323 rcu_read_unlock();
324 } else
325 tasklet_schedule(&local->tx_pending_tasklet);
326 }
327
328 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
329 enum queue_stop_reason reason)
330 {
331 struct ieee80211_local *local = hw_to_local(hw);
332 unsigned long flags;
333
334 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
335 __ieee80211_wake_queue(hw, queue, reason);
336 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
337 }
338
339 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
340 {
341 ieee80211_wake_queue_by_reason(hw, queue,
342 IEEE80211_QUEUE_STOP_REASON_DRIVER);
343 }
344 EXPORT_SYMBOL(ieee80211_wake_queue);
345
346 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
347 enum queue_stop_reason reason)
348 {
349 struct ieee80211_local *local = hw_to_local(hw);
350 struct ieee80211_sub_if_data *sdata;
351 int n_acs = IEEE80211_NUM_ACS;
352
353 trace_stop_queue(local, queue, reason);
354
355 if (WARN_ON(queue >= hw->queues))
356 return;
357
358 if (test_bit(reason, &local->queue_stop_reasons[queue]))
359 return;
360
361 __set_bit(reason, &local->queue_stop_reasons[queue]);
362
363 if (local->hw.queues < IEEE80211_NUM_ACS)
364 n_acs = 1;
365
366 rcu_read_lock();
367 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
368 int ac;
369
370 if (!sdata->dev)
371 continue;
372
373 for (ac = 0; ac < n_acs; ac++) {
374 if (sdata->vif.hw_queue[ac] == queue ||
375 sdata->vif.cab_queue == queue)
376 netif_stop_subqueue(sdata->dev, ac);
377 }
378 }
379 rcu_read_unlock();
380 }
381
382 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
383 enum queue_stop_reason reason)
384 {
385 struct ieee80211_local *local = hw_to_local(hw);
386 unsigned long flags;
387
388 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
389 __ieee80211_stop_queue(hw, queue, reason);
390 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
391 }
392
393 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
394 {
395 ieee80211_stop_queue_by_reason(hw, queue,
396 IEEE80211_QUEUE_STOP_REASON_DRIVER);
397 }
398 EXPORT_SYMBOL(ieee80211_stop_queue);
399
400 void ieee80211_add_pending_skb(struct ieee80211_local *local,
401 struct sk_buff *skb)
402 {
403 struct ieee80211_hw *hw = &local->hw;
404 unsigned long flags;
405 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
406 int queue = info->hw_queue;
407
408 if (WARN_ON(!info->control.vif)) {
409 kfree_skb(skb);
410 return;
411 }
412
413 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
414 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
415 __skb_queue_tail(&local->pending[queue], skb);
416 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
417 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
418 }
419
420 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
421 struct sk_buff_head *skbs,
422 void (*fn)(void *data), void *data)
423 {
424 struct ieee80211_hw *hw = &local->hw;
425 struct sk_buff *skb;
426 unsigned long flags;
427 int queue, i;
428
429 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
430 while ((skb = skb_dequeue(skbs))) {
431 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
432
433 if (WARN_ON(!info->control.vif)) {
434 kfree_skb(skb);
435 continue;
436 }
437
438 queue = info->hw_queue;
439
440 __ieee80211_stop_queue(hw, queue,
441 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
442
443 __skb_queue_tail(&local->pending[queue], skb);
444 }
445
446 if (fn)
447 fn(data);
448
449 for (i = 0; i < hw->queues; i++)
450 __ieee80211_wake_queue(hw, i,
451 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
452 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
453 }
454
455 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
456 enum queue_stop_reason reason)
457 {
458 struct ieee80211_local *local = hw_to_local(hw);
459 unsigned long flags;
460 int i;
461
462 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
463
464 for (i = 0; i < hw->queues; i++)
465 __ieee80211_stop_queue(hw, i, reason);
466
467 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
468 }
469
470 void ieee80211_stop_queues(struct ieee80211_hw *hw)
471 {
472 ieee80211_stop_queues_by_reason(hw,
473 IEEE80211_QUEUE_STOP_REASON_DRIVER);
474 }
475 EXPORT_SYMBOL(ieee80211_stop_queues);
476
477 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
478 {
479 struct ieee80211_local *local = hw_to_local(hw);
480 unsigned long flags;
481 int ret;
482
483 if (WARN_ON(queue >= hw->queues))
484 return true;
485
486 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
487 ret = !!local->queue_stop_reasons[queue];
488 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
489 return ret;
490 }
491 EXPORT_SYMBOL(ieee80211_queue_stopped);
492
493 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
494 enum queue_stop_reason reason)
495 {
496 struct ieee80211_local *local = hw_to_local(hw);
497 unsigned long flags;
498 int i;
499
500 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
501
502 for (i = 0; i < hw->queues; i++)
503 __ieee80211_wake_queue(hw, i, reason);
504
505 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
506 }
507
508 void ieee80211_wake_queues(struct ieee80211_hw *hw)
509 {
510 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
511 }
512 EXPORT_SYMBOL(ieee80211_wake_queues);
513
514 void ieee80211_iterate_active_interfaces(
515 struct ieee80211_hw *hw,
516 void (*iterator)(void *data, u8 *mac,
517 struct ieee80211_vif *vif),
518 void *data)
519 {
520 struct ieee80211_local *local = hw_to_local(hw);
521 struct ieee80211_sub_if_data *sdata;
522
523 mutex_lock(&local->iflist_mtx);
524
525 list_for_each_entry(sdata, &local->interfaces, list) {
526 switch (sdata->vif.type) {
527 case NL80211_IFTYPE_MONITOR:
528 case NL80211_IFTYPE_AP_VLAN:
529 continue;
530 default:
531 break;
532 }
533 if (ieee80211_sdata_running(sdata))
534 iterator(data, sdata->vif.addr,
535 &sdata->vif);
536 }
537
538 sdata = rcu_dereference_protected(local->monitor_sdata,
539 lockdep_is_held(&local->iflist_mtx));
540 if (sdata)
541 iterator(data, sdata->vif.addr, &sdata->vif);
542
543 mutex_unlock(&local->iflist_mtx);
544 }
545 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
546
547 void ieee80211_iterate_active_interfaces_atomic(
548 struct ieee80211_hw *hw,
549 void (*iterator)(void *data, u8 *mac,
550 struct ieee80211_vif *vif),
551 void *data)
552 {
553 struct ieee80211_local *local = hw_to_local(hw);
554 struct ieee80211_sub_if_data *sdata;
555
556 rcu_read_lock();
557
558 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
559 switch (sdata->vif.type) {
560 case NL80211_IFTYPE_MONITOR:
561 case NL80211_IFTYPE_AP_VLAN:
562 continue;
563 default:
564 break;
565 }
566 if (ieee80211_sdata_running(sdata))
567 iterator(data, sdata->vif.addr,
568 &sdata->vif);
569 }
570
571 sdata = rcu_dereference(local->monitor_sdata);
572 if (sdata)
573 iterator(data, sdata->vif.addr, &sdata->vif);
574
575 rcu_read_unlock();
576 }
577 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
578
579 /*
580 * Nothing should have been stuffed into the workqueue during
581 * the suspend->resume cycle. If this WARN is seen then there
582 * is a bug with either the driver suspend or something in
583 * mac80211 stuffing into the workqueue which we haven't yet
584 * cleared during mac80211's suspend cycle.
585 */
586 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
587 {
588 if (WARN(local->suspended && !local->resuming,
589 "queueing ieee80211 work while going to suspend\n"))
590 return false;
591
592 return true;
593 }
594
595 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
596 {
597 struct ieee80211_local *local = hw_to_local(hw);
598
599 if (!ieee80211_can_queue_work(local))
600 return;
601
602 queue_work(local->workqueue, work);
603 }
604 EXPORT_SYMBOL(ieee80211_queue_work);
605
606 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
607 struct delayed_work *dwork,
608 unsigned long delay)
609 {
610 struct ieee80211_local *local = hw_to_local(hw);
611
612 if (!ieee80211_can_queue_work(local))
613 return;
614
615 queue_delayed_work(local->workqueue, dwork, delay);
616 }
617 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
618
619 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
620 struct ieee802_11_elems *elems,
621 u64 filter, u32 crc)
622 {
623 size_t left = len;
624 u8 *pos = start;
625 bool calc_crc = filter != 0;
626 DECLARE_BITMAP(seen_elems, 256);
627
628 bitmap_zero(seen_elems, 256);
629 memset(elems, 0, sizeof(*elems));
630 elems->ie_start = start;
631 elems->total_len = len;
632
633 while (left >= 2) {
634 u8 id, elen;
635 bool elem_parse_failed;
636
637 id = *pos++;
638 elen = *pos++;
639 left -= 2;
640
641 if (elen > left) {
642 elems->parse_error = true;
643 break;
644 }
645
646 if (id != WLAN_EID_VENDOR_SPECIFIC &&
647 id != WLAN_EID_QUIET &&
648 test_bit(id, seen_elems)) {
649 elems->parse_error = true;
650 left -= elen;
651 pos += elen;
652 continue;
653 }
654
655 if (calc_crc && id < 64 && (filter & (1ULL << id)))
656 crc = crc32_be(crc, pos - 2, elen + 2);
657
658 elem_parse_failed = false;
659
660 switch (id) {
661 case WLAN_EID_SSID:
662 elems->ssid = pos;
663 elems->ssid_len = elen;
664 break;
665 case WLAN_EID_SUPP_RATES:
666 elems->supp_rates = pos;
667 elems->supp_rates_len = elen;
668 break;
669 case WLAN_EID_FH_PARAMS:
670 elems->fh_params = pos;
671 elems->fh_params_len = elen;
672 break;
673 case WLAN_EID_DS_PARAMS:
674 elems->ds_params = pos;
675 elems->ds_params_len = elen;
676 break;
677 case WLAN_EID_CF_PARAMS:
678 elems->cf_params = pos;
679 elems->cf_params_len = elen;
680 break;
681 case WLAN_EID_TIM:
682 if (elen >= sizeof(struct ieee80211_tim_ie)) {
683 elems->tim = (void *)pos;
684 elems->tim_len = elen;
685 } else
686 elem_parse_failed = true;
687 break;
688 case WLAN_EID_IBSS_PARAMS:
689 elems->ibss_params = pos;
690 elems->ibss_params_len = elen;
691 break;
692 case WLAN_EID_CHALLENGE:
693 elems->challenge = pos;
694 elems->challenge_len = elen;
695 break;
696 case WLAN_EID_VENDOR_SPECIFIC:
697 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
698 pos[2] == 0xf2) {
699 /* Microsoft OUI (00:50:F2) */
700
701 if (calc_crc)
702 crc = crc32_be(crc, pos - 2, elen + 2);
703
704 if (pos[3] == 1) {
705 /* OUI Type 1 - WPA IE */
706 elems->wpa = pos;
707 elems->wpa_len = elen;
708 } else if (elen >= 5 && pos[3] == 2) {
709 /* OUI Type 2 - WMM IE */
710 if (pos[4] == 0) {
711 elems->wmm_info = pos;
712 elems->wmm_info_len = elen;
713 } else if (pos[4] == 1) {
714 elems->wmm_param = pos;
715 elems->wmm_param_len = elen;
716 }
717 }
718 }
719 break;
720 case WLAN_EID_RSN:
721 elems->rsn = pos;
722 elems->rsn_len = elen;
723 break;
724 case WLAN_EID_ERP_INFO:
725 elems->erp_info = pos;
726 elems->erp_info_len = elen;
727 break;
728 case WLAN_EID_EXT_SUPP_RATES:
729 elems->ext_supp_rates = pos;
730 elems->ext_supp_rates_len = elen;
731 break;
732 case WLAN_EID_HT_CAPABILITY:
733 if (elen >= sizeof(struct ieee80211_ht_cap))
734 elems->ht_cap_elem = (void *)pos;
735 else
736 elem_parse_failed = true;
737 break;
738 case WLAN_EID_HT_OPERATION:
739 if (elen >= sizeof(struct ieee80211_ht_operation))
740 elems->ht_operation = (void *)pos;
741 else
742 elem_parse_failed = true;
743 break;
744 case WLAN_EID_MESH_ID:
745 elems->mesh_id = pos;
746 elems->mesh_id_len = elen;
747 break;
748 case WLAN_EID_MESH_CONFIG:
749 if (elen >= sizeof(struct ieee80211_meshconf_ie))
750 elems->mesh_config = (void *)pos;
751 else
752 elem_parse_failed = true;
753 break;
754 case WLAN_EID_PEER_MGMT:
755 elems->peering = pos;
756 elems->peering_len = elen;
757 break;
758 case WLAN_EID_PREQ:
759 elems->preq = pos;
760 elems->preq_len = elen;
761 break;
762 case WLAN_EID_PREP:
763 elems->prep = pos;
764 elems->prep_len = elen;
765 break;
766 case WLAN_EID_PERR:
767 elems->perr = pos;
768 elems->perr_len = elen;
769 break;
770 case WLAN_EID_RANN:
771 if (elen >= sizeof(struct ieee80211_rann_ie))
772 elems->rann = (void *)pos;
773 else
774 elem_parse_failed = true;
775 break;
776 case WLAN_EID_CHANNEL_SWITCH:
777 if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
778 elem_parse_failed = true;
779 break;
780 }
781 elems->ch_switch_ie = (void *)pos;
782 break;
783 case WLAN_EID_QUIET:
784 if (!elems->quiet_elem) {
785 elems->quiet_elem = pos;
786 elems->quiet_elem_len = elen;
787 }
788 elems->num_of_quiet_elem++;
789 break;
790 case WLAN_EID_COUNTRY:
791 elems->country_elem = pos;
792 elems->country_elem_len = elen;
793 break;
794 case WLAN_EID_PWR_CONSTRAINT:
795 if (elen != 1) {
796 elem_parse_failed = true;
797 break;
798 }
799 elems->pwr_constr_elem = pos;
800 break;
801 case WLAN_EID_TIMEOUT_INTERVAL:
802 elems->timeout_int = pos;
803 elems->timeout_int_len = elen;
804 break;
805 default:
806 break;
807 }
808
809 if (elem_parse_failed)
810 elems->parse_error = true;
811 else
812 set_bit(id, seen_elems);
813
814 left -= elen;
815 pos += elen;
816 }
817
818 if (left != 0)
819 elems->parse_error = true;
820
821 return crc;
822 }
823
824 void ieee802_11_parse_elems(u8 *start, size_t len,
825 struct ieee802_11_elems *elems)
826 {
827 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
828 }
829
830 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
831 bool bss_notify)
832 {
833 struct ieee80211_local *local = sdata->local;
834 struct ieee80211_tx_queue_params qparam;
835 int ac;
836 bool use_11b, enable_qos;
837 int aCWmin, aCWmax;
838
839 if (!local->ops->conf_tx)
840 return;
841
842 if (local->hw.queues < IEEE80211_NUM_ACS)
843 return;
844
845 memset(&qparam, 0, sizeof(qparam));
846
847 use_11b = (local->oper_channel->band == IEEE80211_BAND_2GHZ) &&
848 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
849
850 /*
851 * By default disable QoS in STA mode for old access points, which do
852 * not support 802.11e. New APs will provide proper queue parameters,
853 * that we will configure later.
854 */
855 enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
856
857 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
858 /* Set defaults according to 802.11-2007 Table 7-37 */
859 aCWmax = 1023;
860 if (use_11b)
861 aCWmin = 31;
862 else
863 aCWmin = 15;
864
865 if (enable_qos) {
866 switch (ac) {
867 case IEEE80211_AC_BK:
868 qparam.cw_max = aCWmax;
869 qparam.cw_min = aCWmin;
870 qparam.txop = 0;
871 qparam.aifs = 7;
872 break;
873 /* never happens but let's not leave undefined */
874 default:
875 case IEEE80211_AC_BE:
876 qparam.cw_max = aCWmax;
877 qparam.cw_min = aCWmin;
878 qparam.txop = 0;
879 qparam.aifs = 3;
880 break;
881 case IEEE80211_AC_VI:
882 qparam.cw_max = aCWmin;
883 qparam.cw_min = (aCWmin + 1) / 2 - 1;
884 if (use_11b)
885 qparam.txop = 6016/32;
886 else
887 qparam.txop = 3008/32;
888 qparam.aifs = 2;
889 break;
890 case IEEE80211_AC_VO:
891 qparam.cw_max = (aCWmin + 1) / 2 - 1;
892 qparam.cw_min = (aCWmin + 1) / 4 - 1;
893 if (use_11b)
894 qparam.txop = 3264/32;
895 else
896 qparam.txop = 1504/32;
897 qparam.aifs = 2;
898 break;
899 }
900 } else {
901 /* Confiure old 802.11b/g medium access rules. */
902 qparam.cw_max = aCWmax;
903 qparam.cw_min = aCWmin;
904 qparam.txop = 0;
905 qparam.aifs = 2;
906 }
907
908 qparam.uapsd = false;
909
910 sdata->tx_conf[ac] = qparam;
911 drv_conf_tx(local, sdata, ac, &qparam);
912 }
913
914 if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
915 sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
916 sdata->vif.bss_conf.qos = enable_qos;
917 if (bss_notify)
918 ieee80211_bss_info_change_notify(sdata,
919 BSS_CHANGED_QOS);
920 }
921 }
922
923 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
924 const size_t supp_rates_len,
925 const u8 *supp_rates)
926 {
927 struct ieee80211_local *local = sdata->local;
928 int i, have_higher_than_11mbit = 0;
929
930 /* cf. IEEE 802.11 9.2.12 */
931 for (i = 0; i < supp_rates_len; i++)
932 if ((supp_rates[i] & 0x7f) * 5 > 110)
933 have_higher_than_11mbit = 1;
934
935 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
936 have_higher_than_11mbit)
937 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
938 else
939 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
940
941 ieee80211_set_wmm_default(sdata, true);
942 }
943
944 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
945 enum ieee80211_band band)
946 {
947 struct ieee80211_supported_band *sband;
948 struct ieee80211_rate *bitrates;
949 u32 mandatory_rates;
950 enum ieee80211_rate_flags mandatory_flag;
951 int i;
952
953 sband = local->hw.wiphy->bands[band];
954 if (WARN_ON(!sband))
955 return 1;
956
957 if (band == IEEE80211_BAND_2GHZ)
958 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
959 else
960 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
961
962 bitrates = sband->bitrates;
963 mandatory_rates = 0;
964 for (i = 0; i < sband->n_bitrates; i++)
965 if (bitrates[i].flags & mandatory_flag)
966 mandatory_rates |= BIT(i);
967 return mandatory_rates;
968 }
969
970 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
971 u16 transaction, u16 auth_alg,
972 u8 *extra, size_t extra_len, const u8 *da,
973 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
974 {
975 struct ieee80211_local *local = sdata->local;
976 struct sk_buff *skb;
977 struct ieee80211_mgmt *mgmt;
978 int err;
979
980 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
981 sizeof(*mgmt) + 6 + extra_len);
982 if (!skb)
983 return;
984
985 skb_reserve(skb, local->hw.extra_tx_headroom);
986
987 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
988 memset(mgmt, 0, 24 + 6);
989 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
990 IEEE80211_STYPE_AUTH);
991 memcpy(mgmt->da, da, ETH_ALEN);
992 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
993 memcpy(mgmt->bssid, bssid, ETH_ALEN);
994 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
995 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
996 mgmt->u.auth.status_code = cpu_to_le16(0);
997 if (extra)
998 memcpy(skb_put(skb, extra_len), extra, extra_len);
999
1000 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1001 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1002 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1003 WARN_ON(err);
1004 }
1005
1006 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1007 ieee80211_tx_skb(sdata, skb);
1008 }
1009
1010 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1011 const u8 *ie, size_t ie_len,
1012 enum ieee80211_band band, u32 rate_mask,
1013 u8 channel)
1014 {
1015 struct ieee80211_supported_band *sband;
1016 u8 *pos;
1017 size_t offset = 0, noffset;
1018 int supp_rates_len, i;
1019 u8 rates[32];
1020 int num_rates;
1021 int ext_rates_len;
1022
1023 sband = local->hw.wiphy->bands[band];
1024 if (WARN_ON_ONCE(!sband))
1025 return 0;
1026
1027 pos = buffer;
1028
1029 num_rates = 0;
1030 for (i = 0; i < sband->n_bitrates; i++) {
1031 if ((BIT(i) & rate_mask) == 0)
1032 continue; /* skip rate */
1033 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1034 }
1035
1036 supp_rates_len = min_t(int, num_rates, 8);
1037
1038 *pos++ = WLAN_EID_SUPP_RATES;
1039 *pos++ = supp_rates_len;
1040 memcpy(pos, rates, supp_rates_len);
1041 pos += supp_rates_len;
1042
1043 /* insert "request information" if in custom IEs */
1044 if (ie && ie_len) {
1045 static const u8 before_extrates[] = {
1046 WLAN_EID_SSID,
1047 WLAN_EID_SUPP_RATES,
1048 WLAN_EID_REQUEST,
1049 };
1050 noffset = ieee80211_ie_split(ie, ie_len,
1051 before_extrates,
1052 ARRAY_SIZE(before_extrates),
1053 offset);
1054 memcpy(pos, ie + offset, noffset - offset);
1055 pos += noffset - offset;
1056 offset = noffset;
1057 }
1058
1059 ext_rates_len = num_rates - supp_rates_len;
1060 if (ext_rates_len > 0) {
1061 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1062 *pos++ = ext_rates_len;
1063 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1064 pos += ext_rates_len;
1065 }
1066
1067 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1068 *pos++ = WLAN_EID_DS_PARAMS;
1069 *pos++ = 1;
1070 *pos++ = channel;
1071 }
1072
1073 /* insert custom IEs that go before HT */
1074 if (ie && ie_len) {
1075 static const u8 before_ht[] = {
1076 WLAN_EID_SSID,
1077 WLAN_EID_SUPP_RATES,
1078 WLAN_EID_REQUEST,
1079 WLAN_EID_EXT_SUPP_RATES,
1080 WLAN_EID_DS_PARAMS,
1081 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1082 };
1083 noffset = ieee80211_ie_split(ie, ie_len,
1084 before_ht, ARRAY_SIZE(before_ht),
1085 offset);
1086 memcpy(pos, ie + offset, noffset - offset);
1087 pos += noffset - offset;
1088 offset = noffset;
1089 }
1090
1091 if (sband->ht_cap.ht_supported)
1092 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1093 sband->ht_cap.cap);
1094
1095 /*
1096 * If adding more here, adjust code in main.c
1097 * that calculates local->scan_ies_len.
1098 */
1099
1100 /* add any remaining custom IEs */
1101 if (ie && ie_len) {
1102 noffset = ie_len;
1103 memcpy(pos, ie + offset, noffset - offset);
1104 pos += noffset - offset;
1105 }
1106
1107 if (sband->vht_cap.vht_supported)
1108 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1109 sband->vht_cap.cap);
1110
1111 return pos - buffer;
1112 }
1113
1114 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1115 u8 *dst, u32 ratemask,
1116 struct ieee80211_channel *chan,
1117 const u8 *ssid, size_t ssid_len,
1118 const u8 *ie, size_t ie_len,
1119 bool directed)
1120 {
1121 struct ieee80211_local *local = sdata->local;
1122 struct sk_buff *skb;
1123 struct ieee80211_mgmt *mgmt;
1124 size_t buf_len;
1125 u8 *buf;
1126 u8 chan_no;
1127
1128 /* FIXME: come up with a proper value */
1129 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1130 if (!buf)
1131 return NULL;
1132
1133 /*
1134 * Do not send DS Channel parameter for directed probe requests
1135 * in order to maximize the chance that we get a response. Some
1136 * badly-behaved APs don't respond when this parameter is included.
1137 */
1138 if (directed)
1139 chan_no = 0;
1140 else
1141 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1142
1143 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len, chan->band,
1144 ratemask, chan_no);
1145
1146 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1147 ssid, ssid_len,
1148 buf, buf_len);
1149 if (!skb)
1150 goto out;
1151
1152 if (dst) {
1153 mgmt = (struct ieee80211_mgmt *) skb->data;
1154 memcpy(mgmt->da, dst, ETH_ALEN);
1155 memcpy(mgmt->bssid, dst, ETH_ALEN);
1156 }
1157
1158 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1159
1160 out:
1161 kfree(buf);
1162
1163 return skb;
1164 }
1165
1166 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1167 const u8 *ssid, size_t ssid_len,
1168 const u8 *ie, size_t ie_len,
1169 u32 ratemask, bool directed, bool no_cck,
1170 struct ieee80211_channel *channel)
1171 {
1172 struct sk_buff *skb;
1173
1174 skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1175 ssid, ssid_len,
1176 ie, ie_len, directed);
1177 if (skb) {
1178 if (no_cck)
1179 IEEE80211_SKB_CB(skb)->flags |=
1180 IEEE80211_TX_CTL_NO_CCK_RATE;
1181 ieee80211_tx_skb(sdata, skb);
1182 }
1183 }
1184
1185 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1186 struct ieee802_11_elems *elems,
1187 enum ieee80211_band band, u32 *basic_rates)
1188 {
1189 struct ieee80211_supported_band *sband;
1190 struct ieee80211_rate *bitrates;
1191 size_t num_rates;
1192 u32 supp_rates;
1193 int i, j;
1194 sband = local->hw.wiphy->bands[band];
1195
1196 if (WARN_ON(!sband))
1197 return 1;
1198
1199 bitrates = sband->bitrates;
1200 num_rates = sband->n_bitrates;
1201 supp_rates = 0;
1202 for (i = 0; i < elems->supp_rates_len +
1203 elems->ext_supp_rates_len; i++) {
1204 u8 rate = 0;
1205 int own_rate;
1206 bool is_basic;
1207 if (i < elems->supp_rates_len)
1208 rate = elems->supp_rates[i];
1209 else if (elems->ext_supp_rates)
1210 rate = elems->ext_supp_rates
1211 [i - elems->supp_rates_len];
1212 own_rate = 5 * (rate & 0x7f);
1213 is_basic = !!(rate & 0x80);
1214
1215 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1216 continue;
1217
1218 for (j = 0; j < num_rates; j++) {
1219 if (bitrates[j].bitrate == own_rate) {
1220 supp_rates |= BIT(j);
1221 if (basic_rates && is_basic)
1222 *basic_rates |= BIT(j);
1223 }
1224 }
1225 }
1226 return supp_rates;
1227 }
1228
1229 void ieee80211_stop_device(struct ieee80211_local *local)
1230 {
1231 ieee80211_led_radio(local, false);
1232 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1233
1234 cancel_work_sync(&local->reconfig_filter);
1235
1236 flush_workqueue(local->workqueue);
1237 drv_stop(local);
1238 }
1239
1240 int ieee80211_reconfig(struct ieee80211_local *local)
1241 {
1242 struct ieee80211_hw *hw = &local->hw;
1243 struct ieee80211_sub_if_data *sdata;
1244 struct sta_info *sta;
1245 int res, i;
1246
1247 #ifdef CONFIG_PM
1248 if (local->suspended)
1249 local->resuming = true;
1250
1251 if (local->wowlan) {
1252 local->wowlan = false;
1253 res = drv_resume(local);
1254 if (res < 0) {
1255 local->resuming = false;
1256 return res;
1257 }
1258 if (res == 0)
1259 goto wake_up;
1260 WARN_ON(res > 1);
1261 /*
1262 * res is 1, which means the driver requested
1263 * to go through a regular reset on wakeup.
1264 */
1265 }
1266 #endif
1267 /* everything else happens only if HW was up & running */
1268 if (!local->open_count)
1269 goto wake_up;
1270
1271 /*
1272 * Upon resume hardware can sometimes be goofy due to
1273 * various platform / driver / bus issues, so restarting
1274 * the device may at times not work immediately. Propagate
1275 * the error.
1276 */
1277 res = drv_start(local);
1278 if (res) {
1279 WARN(local->suspended, "Hardware became unavailable "
1280 "upon resume. This could be a software issue "
1281 "prior to suspend or a hardware issue.\n");
1282 return res;
1283 }
1284
1285 /* setup fragmentation threshold */
1286 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1287
1288 /* setup RTS threshold */
1289 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1290
1291 /* reset coverage class */
1292 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1293
1294 ieee80211_led_radio(local, true);
1295 ieee80211_mod_tpt_led_trig(local,
1296 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1297
1298 /* add interfaces */
1299 sdata = rtnl_dereference(local->monitor_sdata);
1300 if (sdata) {
1301 res = drv_add_interface(local, sdata);
1302 if (WARN_ON(res)) {
1303 rcu_assign_pointer(local->monitor_sdata, NULL);
1304 synchronize_net();
1305 kfree(sdata);
1306 }
1307 }
1308
1309 list_for_each_entry(sdata, &local->interfaces, list) {
1310 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1311 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1312 ieee80211_sdata_running(sdata))
1313 res = drv_add_interface(local, sdata);
1314 }
1315
1316 /* add STAs back */
1317 mutex_lock(&local->sta_mtx);
1318 list_for_each_entry(sta, &local->sta_list, list) {
1319 enum ieee80211_sta_state state;
1320
1321 if (!sta->uploaded)
1322 continue;
1323
1324 /* AP-mode stations will be added later */
1325 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1326 continue;
1327
1328 for (state = IEEE80211_STA_NOTEXIST;
1329 state < sta->sta_state; state++)
1330 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1331 state + 1));
1332 }
1333 mutex_unlock(&local->sta_mtx);
1334
1335 /* reconfigure tx conf */
1336 if (hw->queues >= IEEE80211_NUM_ACS) {
1337 list_for_each_entry(sdata, &local->interfaces, list) {
1338 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1339 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1340 !ieee80211_sdata_running(sdata))
1341 continue;
1342
1343 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1344 drv_conf_tx(local, sdata, i,
1345 &sdata->tx_conf[i]);
1346 }
1347 }
1348
1349 /* reconfigure hardware */
1350 ieee80211_hw_config(local, ~0);
1351
1352 ieee80211_configure_filter(local);
1353
1354 /* Finally also reconfigure all the BSS information */
1355 list_for_each_entry(sdata, &local->interfaces, list) {
1356 u32 changed;
1357
1358 if (!ieee80211_sdata_running(sdata))
1359 continue;
1360
1361 /* common change flags for all interface types */
1362 changed = BSS_CHANGED_ERP_CTS_PROT |
1363 BSS_CHANGED_ERP_PREAMBLE |
1364 BSS_CHANGED_ERP_SLOT |
1365 BSS_CHANGED_HT |
1366 BSS_CHANGED_BASIC_RATES |
1367 BSS_CHANGED_BEACON_INT |
1368 BSS_CHANGED_BSSID |
1369 BSS_CHANGED_CQM |
1370 BSS_CHANGED_QOS |
1371 BSS_CHANGED_IDLE;
1372
1373 switch (sdata->vif.type) {
1374 case NL80211_IFTYPE_STATION:
1375 changed |= BSS_CHANGED_ASSOC |
1376 BSS_CHANGED_ARP_FILTER |
1377 BSS_CHANGED_PS;
1378 mutex_lock(&sdata->u.mgd.mtx);
1379 ieee80211_bss_info_change_notify(sdata, changed);
1380 mutex_unlock(&sdata->u.mgd.mtx);
1381 break;
1382 case NL80211_IFTYPE_ADHOC:
1383 changed |= BSS_CHANGED_IBSS;
1384 /* fall through */
1385 case NL80211_IFTYPE_AP:
1386 changed |= BSS_CHANGED_SSID;
1387
1388 if (sdata->vif.type == NL80211_IFTYPE_AP)
1389 changed |= BSS_CHANGED_AP_PROBE_RESP;
1390
1391 /* fall through */
1392 case NL80211_IFTYPE_MESH_POINT:
1393 changed |= BSS_CHANGED_BEACON |
1394 BSS_CHANGED_BEACON_ENABLED;
1395 ieee80211_bss_info_change_notify(sdata, changed);
1396 break;
1397 case NL80211_IFTYPE_WDS:
1398 break;
1399 case NL80211_IFTYPE_AP_VLAN:
1400 case NL80211_IFTYPE_MONITOR:
1401 /* ignore virtual */
1402 break;
1403 case NL80211_IFTYPE_P2P_DEVICE:
1404 changed = BSS_CHANGED_IDLE;
1405 break;
1406 case NL80211_IFTYPE_UNSPECIFIED:
1407 case NUM_NL80211_IFTYPES:
1408 case NL80211_IFTYPE_P2P_CLIENT:
1409 case NL80211_IFTYPE_P2P_GO:
1410 WARN_ON(1);
1411 break;
1412 }
1413 }
1414
1415 ieee80211_recalc_ps(local, -1);
1416
1417 /*
1418 * The sta might be in psm against the ap (e.g. because
1419 * this was the state before a hw restart), so we
1420 * explicitly send a null packet in order to make sure
1421 * it'll sync against the ap (and get out of psm).
1422 */
1423 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1424 list_for_each_entry(sdata, &local->interfaces, list) {
1425 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1426 continue;
1427
1428 ieee80211_send_nullfunc(local, sdata, 0);
1429 }
1430 }
1431
1432 /* APs are now beaconing, add back stations */
1433 mutex_lock(&local->sta_mtx);
1434 list_for_each_entry(sta, &local->sta_list, list) {
1435 enum ieee80211_sta_state state;
1436
1437 if (!sta->uploaded)
1438 continue;
1439
1440 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1441 continue;
1442
1443 for (state = IEEE80211_STA_NOTEXIST;
1444 state < sta->sta_state; state++)
1445 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1446 state + 1));
1447 }
1448 mutex_unlock(&local->sta_mtx);
1449
1450 /* add back keys */
1451 list_for_each_entry(sdata, &local->interfaces, list)
1452 if (ieee80211_sdata_running(sdata))
1453 ieee80211_enable_keys(sdata);
1454
1455 wake_up:
1456 local->in_reconfig = false;
1457 barrier();
1458
1459 /*
1460 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1461 * sessions can be established after a resume.
1462 *
1463 * Also tear down aggregation sessions since reconfiguring
1464 * them in a hardware restart scenario is not easily done
1465 * right now, and the hardware will have lost information
1466 * about the sessions, but we and the AP still think they
1467 * are active. This is really a workaround though.
1468 */
1469 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1470 mutex_lock(&local->sta_mtx);
1471
1472 list_for_each_entry(sta, &local->sta_list, list) {
1473 ieee80211_sta_tear_down_BA_sessions(sta, true);
1474 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1475 }
1476
1477 mutex_unlock(&local->sta_mtx);
1478 }
1479
1480 ieee80211_wake_queues_by_reason(hw,
1481 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1482
1483 /*
1484 * If this is for hw restart things are still running.
1485 * We may want to change that later, however.
1486 */
1487 if (!local->suspended)
1488 return 0;
1489
1490 #ifdef CONFIG_PM
1491 /* first set suspended false, then resuming */
1492 local->suspended = false;
1493 mb();
1494 local->resuming = false;
1495
1496 list_for_each_entry(sdata, &local->interfaces, list) {
1497 switch(sdata->vif.type) {
1498 case NL80211_IFTYPE_STATION:
1499 ieee80211_sta_restart(sdata);
1500 break;
1501 case NL80211_IFTYPE_ADHOC:
1502 ieee80211_ibss_restart(sdata);
1503 break;
1504 case NL80211_IFTYPE_MESH_POINT:
1505 ieee80211_mesh_restart(sdata);
1506 break;
1507 default:
1508 break;
1509 }
1510 }
1511
1512 mod_timer(&local->sta_cleanup, jiffies + 1);
1513
1514 mutex_lock(&local->sta_mtx);
1515 list_for_each_entry(sta, &local->sta_list, list)
1516 mesh_plink_restart(sta);
1517 mutex_unlock(&local->sta_mtx);
1518 #else
1519 WARN_ON(1);
1520 #endif
1521 return 0;
1522 }
1523
1524 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1525 {
1526 struct ieee80211_sub_if_data *sdata;
1527 struct ieee80211_local *local;
1528 struct ieee80211_key *key;
1529
1530 if (WARN_ON(!vif))
1531 return;
1532
1533 sdata = vif_to_sdata(vif);
1534 local = sdata->local;
1535
1536 if (WARN_ON(!local->resuming))
1537 return;
1538
1539 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1540 return;
1541
1542 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1543
1544 mutex_lock(&local->key_mtx);
1545 list_for_each_entry(key, &sdata->key_list, list)
1546 key->flags |= KEY_FLAG_TAINTED;
1547 mutex_unlock(&local->key_mtx);
1548 }
1549 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1550
1551 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1552 enum ieee80211_smps_mode *smps_mode)
1553 {
1554 if (ifmgd->associated) {
1555 *smps_mode = ifmgd->ap_smps;
1556
1557 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1558 if (ifmgd->powersave)
1559 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1560 else
1561 *smps_mode = IEEE80211_SMPS_OFF;
1562 }
1563
1564 return 1;
1565 }
1566
1567 return 0;
1568 }
1569
1570 /* must hold iflist_mtx */
1571 void ieee80211_recalc_smps(struct ieee80211_local *local)
1572 {
1573 struct ieee80211_sub_if_data *sdata;
1574 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1575 int count = 0;
1576
1577 lockdep_assert_held(&local->iflist_mtx);
1578
1579 /*
1580 * This function could be improved to handle multiple
1581 * interfaces better, but right now it makes any
1582 * non-station interfaces force SM PS to be turned
1583 * off. If there are multiple station interfaces it
1584 * could also use the best possible mode, e.g. if
1585 * one is in static and the other in dynamic then
1586 * dynamic is ok.
1587 */
1588
1589 list_for_each_entry(sdata, &local->interfaces, list) {
1590 if (!ieee80211_sdata_running(sdata))
1591 continue;
1592 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
1593 continue;
1594 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1595 goto set;
1596
1597 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1598
1599 if (count > 1) {
1600 smps_mode = IEEE80211_SMPS_OFF;
1601 break;
1602 }
1603 }
1604
1605 if (smps_mode == local->smps_mode)
1606 return;
1607
1608 set:
1609 local->smps_mode = smps_mode;
1610 /* changed flag is auto-detected for this */
1611 ieee80211_hw_config(local, 0);
1612 }
1613
1614 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1615 {
1616 int i;
1617
1618 for (i = 0; i < n_ids; i++)
1619 if (ids[i] == id)
1620 return true;
1621 return false;
1622 }
1623
1624 /**
1625 * ieee80211_ie_split - split an IE buffer according to ordering
1626 *
1627 * @ies: the IE buffer
1628 * @ielen: the length of the IE buffer
1629 * @ids: an array with element IDs that are allowed before
1630 * the split
1631 * @n_ids: the size of the element ID array
1632 * @offset: offset where to start splitting in the buffer
1633 *
1634 * This function splits an IE buffer by updating the @offset
1635 * variable to point to the location where the buffer should be
1636 * split.
1637 *
1638 * It assumes that the given IE buffer is well-formed, this
1639 * has to be guaranteed by the caller!
1640 *
1641 * It also assumes that the IEs in the buffer are ordered
1642 * correctly, if not the result of using this function will not
1643 * be ordered correctly either, i.e. it does no reordering.
1644 *
1645 * The function returns the offset where the next part of the
1646 * buffer starts, which may be @ielen if the entire (remainder)
1647 * of the buffer should be used.
1648 */
1649 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1650 const u8 *ids, int n_ids, size_t offset)
1651 {
1652 size_t pos = offset;
1653
1654 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1655 pos += 2 + ies[pos + 1];
1656
1657 return pos;
1658 }
1659
1660 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1661 {
1662 size_t pos = offset;
1663
1664 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1665 pos += 2 + ies[pos + 1];
1666
1667 return pos;
1668 }
1669
1670 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1671 int rssi_min_thold,
1672 int rssi_max_thold)
1673 {
1674 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1675
1676 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1677 return;
1678
1679 /*
1680 * Scale up threshold values before storing it, as the RSSI averaging
1681 * algorithm uses a scaled up value as well. Change this scaling
1682 * factor if the RSSI averaging algorithm changes.
1683 */
1684 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1685 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1686 }
1687
1688 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1689 int rssi_min_thold,
1690 int rssi_max_thold)
1691 {
1692 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1693
1694 WARN_ON(rssi_min_thold == rssi_max_thold ||
1695 rssi_min_thold > rssi_max_thold);
1696
1697 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1698 rssi_max_thold);
1699 }
1700 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1701
1702 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1703 {
1704 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1705
1706 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1707 }
1708 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1709
1710 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1711 u16 cap)
1712 {
1713 __le16 tmp;
1714
1715 *pos++ = WLAN_EID_HT_CAPABILITY;
1716 *pos++ = sizeof(struct ieee80211_ht_cap);
1717 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1718
1719 /* capability flags */
1720 tmp = cpu_to_le16(cap);
1721 memcpy(pos, &tmp, sizeof(u16));
1722 pos += sizeof(u16);
1723
1724 /* AMPDU parameters */
1725 *pos++ = ht_cap->ampdu_factor |
1726 (ht_cap->ampdu_density <<
1727 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1728
1729 /* MCS set */
1730 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1731 pos += sizeof(ht_cap->mcs);
1732
1733 /* extended capabilities */
1734 pos += sizeof(__le16);
1735
1736 /* BF capabilities */
1737 pos += sizeof(__le32);
1738
1739 /* antenna selection */
1740 pos += sizeof(u8);
1741
1742 return pos;
1743 }
1744
1745 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1746 u32 cap)
1747 {
1748 __le32 tmp;
1749
1750 *pos++ = WLAN_EID_VHT_CAPABILITY;
1751 *pos++ = sizeof(struct ieee80211_vht_capabilities);
1752 memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1753
1754 /* capability flags */
1755 tmp = cpu_to_le32(cap);
1756 memcpy(pos, &tmp, sizeof(u32));
1757 pos += sizeof(u32);
1758
1759 /* VHT MCS set */
1760 memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1761 pos += sizeof(vht_cap->vht_mcs);
1762
1763 return pos;
1764 }
1765
1766 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1767 struct ieee80211_channel *channel,
1768 enum nl80211_channel_type channel_type,
1769 u16 prot_mode)
1770 {
1771 struct ieee80211_ht_operation *ht_oper;
1772 /* Build HT Information */
1773 *pos++ = WLAN_EID_HT_OPERATION;
1774 *pos++ = sizeof(struct ieee80211_ht_operation);
1775 ht_oper = (struct ieee80211_ht_operation *)pos;
1776 ht_oper->primary_chan =
1777 ieee80211_frequency_to_channel(channel->center_freq);
1778 switch (channel_type) {
1779 case NL80211_CHAN_HT40MINUS:
1780 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1781 break;
1782 case NL80211_CHAN_HT40PLUS:
1783 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1784 break;
1785 case NL80211_CHAN_HT20:
1786 default:
1787 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1788 break;
1789 }
1790 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1791 channel_type != NL80211_CHAN_NO_HT &&
1792 channel_type != NL80211_CHAN_HT20)
1793 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1794
1795 ht_oper->operation_mode = cpu_to_le16(prot_mode);
1796 ht_oper->stbc_param = 0x0000;
1797
1798 /* It seems that Basic MCS set and Supported MCS set
1799 are identical for the first 10 bytes */
1800 memset(&ht_oper->basic_set, 0, 16);
1801 memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1802
1803 return pos + sizeof(struct ieee80211_ht_operation);
1804 }
1805
1806 enum nl80211_channel_type
1807 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1808 {
1809 enum nl80211_channel_type channel_type;
1810
1811 if (!ht_oper)
1812 return NL80211_CHAN_NO_HT;
1813
1814 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1815 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1816 channel_type = NL80211_CHAN_HT20;
1817 break;
1818 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1819 channel_type = NL80211_CHAN_HT40PLUS;
1820 break;
1821 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1822 channel_type = NL80211_CHAN_HT40MINUS;
1823 break;
1824 default:
1825 channel_type = NL80211_CHAN_NO_HT;
1826 }
1827
1828 return channel_type;
1829 }
1830
1831 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1832 struct sk_buff *skb, bool need_basic,
1833 enum ieee80211_band band)
1834 {
1835 struct ieee80211_local *local = sdata->local;
1836 struct ieee80211_supported_band *sband;
1837 int rate;
1838 u8 i, rates, *pos;
1839 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1840
1841 sband = local->hw.wiphy->bands[band];
1842 rates = sband->n_bitrates;
1843 if (rates > 8)
1844 rates = 8;
1845
1846 if (skb_tailroom(skb) < rates + 2)
1847 return -ENOMEM;
1848
1849 pos = skb_put(skb, rates + 2);
1850 *pos++ = WLAN_EID_SUPP_RATES;
1851 *pos++ = rates;
1852 for (i = 0; i < rates; i++) {
1853 u8 basic = 0;
1854 if (need_basic && basic_rates & BIT(i))
1855 basic = 0x80;
1856 rate = sband->bitrates[i].bitrate;
1857 *pos++ = basic | (u8) (rate / 5);
1858 }
1859
1860 return 0;
1861 }
1862
1863 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1864 struct sk_buff *skb, bool need_basic,
1865 enum ieee80211_band band)
1866 {
1867 struct ieee80211_local *local = sdata->local;
1868 struct ieee80211_supported_band *sband;
1869 int rate;
1870 u8 i, exrates, *pos;
1871 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1872
1873 sband = local->hw.wiphy->bands[band];
1874 exrates = sband->n_bitrates;
1875 if (exrates > 8)
1876 exrates -= 8;
1877 else
1878 exrates = 0;
1879
1880 if (skb_tailroom(skb) < exrates + 2)
1881 return -ENOMEM;
1882
1883 if (exrates) {
1884 pos = skb_put(skb, exrates + 2);
1885 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1886 *pos++ = exrates;
1887 for (i = 8; i < sband->n_bitrates; i++) {
1888 u8 basic = 0;
1889 if (need_basic && basic_rates & BIT(i))
1890 basic = 0x80;
1891 rate = sband->bitrates[i].bitrate;
1892 *pos++ = basic | (u8) (rate / 5);
1893 }
1894 }
1895 return 0;
1896 }
1897
1898 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1899 {
1900 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1901 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1902
1903 if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1904 /* non-managed type inferfaces */
1905 return 0;
1906 }
1907 return ifmgd->ave_beacon_signal;
1908 }
1909 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
Linus' kernel tree