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037d148e9f19baeff341dbc84bb9846c3145c03e
[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 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 (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
280 continue;
281
282 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
283 local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
284 continue;
285
286 for (ac = 0; ac < n_acs; ac++) {
287 int ac_queue = sdata->vif.hw_queue[ac];
288
289 if (ac_queue == queue ||
290 (sdata->vif.cab_queue == queue &&
291 local->queue_stop_reasons[ac_queue] == 0 &&
292 skb_queue_empty(&local->pending[ac_queue])))
293 netif_wake_subqueue(sdata->dev, ac);
294 }
295 }
296 }
297
298 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
299 enum queue_stop_reason reason)
300 {
301 struct ieee80211_local *local = hw_to_local(hw);
302
303 trace_wake_queue(local, queue, reason);
304
305 if (WARN_ON(queue >= hw->queues))
306 return;
307
308 if (!test_bit(reason, &local->queue_stop_reasons[queue]))
309 return;
310
311 __clear_bit(reason, &local->queue_stop_reasons[queue]);
312
313 if (local->queue_stop_reasons[queue] != 0)
314 /* someone still has this queue stopped */
315 return;
316
317 if (skb_queue_empty(&local->pending[queue])) {
318 rcu_read_lock();
319 ieee80211_propagate_queue_wake(local, queue);
320 rcu_read_unlock();
321 } else
322 tasklet_schedule(&local->tx_pending_tasklet);
323 }
324
325 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
326 enum queue_stop_reason reason)
327 {
328 struct ieee80211_local *local = hw_to_local(hw);
329 unsigned long flags;
330
331 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
332 __ieee80211_wake_queue(hw, queue, reason);
333 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
334 }
335
336 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
337 {
338 ieee80211_wake_queue_by_reason(hw, queue,
339 IEEE80211_QUEUE_STOP_REASON_DRIVER);
340 }
341 EXPORT_SYMBOL(ieee80211_wake_queue);
342
343 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
344 enum queue_stop_reason reason)
345 {
346 struct ieee80211_local *local = hw_to_local(hw);
347 struct ieee80211_sub_if_data *sdata;
348 int n_acs = IEEE80211_NUM_ACS;
349
350 trace_stop_queue(local, queue, reason);
351
352 if (WARN_ON(queue >= hw->queues))
353 return;
354
355 if (test_bit(reason, &local->queue_stop_reasons[queue]))
356 return;
357
358 __set_bit(reason, &local->queue_stop_reasons[queue]);
359
360 if (local->hw.queues < IEEE80211_NUM_ACS)
361 n_acs = 1;
362
363 rcu_read_lock();
364 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
365 int ac;
366
367 for (ac = 0; ac < n_acs; ac++) {
368 if (sdata->vif.hw_queue[ac] == queue ||
369 sdata->vif.cab_queue == queue)
370 netif_stop_subqueue(sdata->dev, ac);
371 }
372 }
373 rcu_read_unlock();
374 }
375
376 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
377 enum queue_stop_reason reason)
378 {
379 struct ieee80211_local *local = hw_to_local(hw);
380 unsigned long flags;
381
382 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
383 __ieee80211_stop_queue(hw, queue, reason);
384 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
385 }
386
387 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
388 {
389 ieee80211_stop_queue_by_reason(hw, queue,
390 IEEE80211_QUEUE_STOP_REASON_DRIVER);
391 }
392 EXPORT_SYMBOL(ieee80211_stop_queue);
393
394 void ieee80211_add_pending_skb(struct ieee80211_local *local,
395 struct sk_buff *skb)
396 {
397 struct ieee80211_hw *hw = &local->hw;
398 unsigned long flags;
399 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
400 int queue = info->hw_queue;
401
402 if (WARN_ON(!info->control.vif)) {
403 kfree_skb(skb);
404 return;
405 }
406
407 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
408 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
409 __skb_queue_tail(&local->pending[queue], skb);
410 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
411 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
412 }
413
414 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
415 struct sk_buff_head *skbs,
416 void (*fn)(void *data), void *data)
417 {
418 struct ieee80211_hw *hw = &local->hw;
419 struct sk_buff *skb;
420 unsigned long flags;
421 int queue, i;
422
423 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
424 while ((skb = skb_dequeue(skbs))) {
425 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
426
427 if (WARN_ON(!info->control.vif)) {
428 kfree_skb(skb);
429 continue;
430 }
431
432 queue = info->hw_queue;
433
434 __ieee80211_stop_queue(hw, queue,
435 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
436
437 __skb_queue_tail(&local->pending[queue], skb);
438 }
439
440 if (fn)
441 fn(data);
442
443 for (i = 0; i < hw->queues; i++)
444 __ieee80211_wake_queue(hw, i,
445 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
446 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
447 }
448
449 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
450 enum queue_stop_reason reason)
451 {
452 struct ieee80211_local *local = hw_to_local(hw);
453 unsigned long flags;
454 int i;
455
456 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
457
458 for (i = 0; i < hw->queues; i++)
459 __ieee80211_stop_queue(hw, i, reason);
460
461 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
462 }
463
464 void ieee80211_stop_queues(struct ieee80211_hw *hw)
465 {
466 ieee80211_stop_queues_by_reason(hw,
467 IEEE80211_QUEUE_STOP_REASON_DRIVER);
468 }
469 EXPORT_SYMBOL(ieee80211_stop_queues);
470
471 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
472 {
473 struct ieee80211_local *local = hw_to_local(hw);
474 unsigned long flags;
475 int ret;
476
477 if (WARN_ON(queue >= hw->queues))
478 return true;
479
480 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
481 ret = !!local->queue_stop_reasons[queue];
482 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
483 return ret;
484 }
485 EXPORT_SYMBOL(ieee80211_queue_stopped);
486
487 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
488 enum queue_stop_reason reason)
489 {
490 struct ieee80211_local *local = hw_to_local(hw);
491 unsigned long flags;
492 int i;
493
494 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
495
496 for (i = 0; i < hw->queues; i++)
497 __ieee80211_wake_queue(hw, i, reason);
498
499 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
500 }
501
502 void ieee80211_wake_queues(struct ieee80211_hw *hw)
503 {
504 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
505 }
506 EXPORT_SYMBOL(ieee80211_wake_queues);
507
508 void ieee80211_iterate_active_interfaces(
509 struct ieee80211_hw *hw,
510 void (*iterator)(void *data, u8 *mac,
511 struct ieee80211_vif *vif),
512 void *data)
513 {
514 struct ieee80211_local *local = hw_to_local(hw);
515 struct ieee80211_sub_if_data *sdata;
516
517 mutex_lock(&local->iflist_mtx);
518
519 list_for_each_entry(sdata, &local->interfaces, list) {
520 switch (sdata->vif.type) {
521 case NL80211_IFTYPE_MONITOR:
522 case NL80211_IFTYPE_AP_VLAN:
523 continue;
524 default:
525 break;
526 }
527 if (ieee80211_sdata_running(sdata))
528 iterator(data, sdata->vif.addr,
529 &sdata->vif);
530 }
531
532 sdata = rcu_dereference_protected(local->monitor_sdata,
533 lockdep_is_held(&local->iflist_mtx));
534 if (sdata)
535 iterator(data, sdata->vif.addr, &sdata->vif);
536
537 mutex_unlock(&local->iflist_mtx);
538 }
539 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
540
541 void ieee80211_iterate_active_interfaces_atomic(
542 struct ieee80211_hw *hw,
543 void (*iterator)(void *data, u8 *mac,
544 struct ieee80211_vif *vif),
545 void *data)
546 {
547 struct ieee80211_local *local = hw_to_local(hw);
548 struct ieee80211_sub_if_data *sdata;
549
550 rcu_read_lock();
551
552 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
553 switch (sdata->vif.type) {
554 case NL80211_IFTYPE_MONITOR:
555 case NL80211_IFTYPE_AP_VLAN:
556 continue;
557 default:
558 break;
559 }
560 if (ieee80211_sdata_running(sdata))
561 iterator(data, sdata->vif.addr,
562 &sdata->vif);
563 }
564
565 sdata = rcu_dereference(local->monitor_sdata);
566 if (sdata)
567 iterator(data, sdata->vif.addr, &sdata->vif);
568
569 rcu_read_unlock();
570 }
571 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
572
573 /*
574 * Nothing should have been stuffed into the workqueue during
575 * the suspend->resume cycle. If this WARN is seen then there
576 * is a bug with either the driver suspend or something in
577 * mac80211 stuffing into the workqueue which we haven't yet
578 * cleared during mac80211's suspend cycle.
579 */
580 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
581 {
582 if (WARN(local->suspended && !local->resuming,
583 "queueing ieee80211 work while going to suspend\n"))
584 return false;
585
586 return true;
587 }
588
589 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
590 {
591 struct ieee80211_local *local = hw_to_local(hw);
592
593 if (!ieee80211_can_queue_work(local))
594 return;
595
596 queue_work(local->workqueue, work);
597 }
598 EXPORT_SYMBOL(ieee80211_queue_work);
599
600 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
601 struct delayed_work *dwork,
602 unsigned long delay)
603 {
604 struct ieee80211_local *local = hw_to_local(hw);
605
606 if (!ieee80211_can_queue_work(local))
607 return;
608
609 queue_delayed_work(local->workqueue, dwork, delay);
610 }
611 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
612
613 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
614 struct ieee802_11_elems *elems,
615 u64 filter, u32 crc)
616 {
617 size_t left = len;
618 u8 *pos = start;
619 bool calc_crc = filter != 0;
620 DECLARE_BITMAP(seen_elems, 256);
621
622 bitmap_zero(seen_elems, 256);
623 memset(elems, 0, sizeof(*elems));
624 elems->ie_start = start;
625 elems->total_len = len;
626
627 while (left >= 2) {
628 u8 id, elen;
629 bool elem_parse_failed;
630
631 id = *pos++;
632 elen = *pos++;
633 left -= 2;
634
635 if (elen > left) {
636 elems->parse_error = true;
637 break;
638 }
639
640 if (id != WLAN_EID_VENDOR_SPECIFIC &&
641 id != WLAN_EID_QUIET &&
642 test_bit(id, seen_elems)) {
643 elems->parse_error = true;
644 left -= elen;
645 pos += elen;
646 continue;
647 }
648
649 if (calc_crc && id < 64 && (filter & (1ULL << id)))
650 crc = crc32_be(crc, pos - 2, elen + 2);
651
652 elem_parse_failed = false;
653
654 switch (id) {
655 case WLAN_EID_SSID:
656 elems->ssid = pos;
657 elems->ssid_len = elen;
658 break;
659 case WLAN_EID_SUPP_RATES:
660 elems->supp_rates = pos;
661 elems->supp_rates_len = elen;
662 break;
663 case WLAN_EID_FH_PARAMS:
664 elems->fh_params = pos;
665 elems->fh_params_len = elen;
666 break;
667 case WLAN_EID_DS_PARAMS:
668 elems->ds_params = pos;
669 elems->ds_params_len = elen;
670 break;
671 case WLAN_EID_CF_PARAMS:
672 elems->cf_params = pos;
673 elems->cf_params_len = elen;
674 break;
675 case WLAN_EID_TIM:
676 if (elen >= sizeof(struct ieee80211_tim_ie)) {
677 elems->tim = (void *)pos;
678 elems->tim_len = elen;
679 } else
680 elem_parse_failed = true;
681 break;
682 case WLAN_EID_IBSS_PARAMS:
683 elems->ibss_params = pos;
684 elems->ibss_params_len = elen;
685 break;
686 case WLAN_EID_CHALLENGE:
687 elems->challenge = pos;
688 elems->challenge_len = elen;
689 break;
690 case WLAN_EID_VENDOR_SPECIFIC:
691 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
692 pos[2] == 0xf2) {
693 /* Microsoft OUI (00:50:F2) */
694
695 if (calc_crc)
696 crc = crc32_be(crc, pos - 2, elen + 2);
697
698 if (pos[3] == 1) {
699 /* OUI Type 1 - WPA IE */
700 elems->wpa = pos;
701 elems->wpa_len = elen;
702 } else if (elen >= 5 && pos[3] == 2) {
703 /* OUI Type 2 - WMM IE */
704 if (pos[4] == 0) {
705 elems->wmm_info = pos;
706 elems->wmm_info_len = elen;
707 } else if (pos[4] == 1) {
708 elems->wmm_param = pos;
709 elems->wmm_param_len = elen;
710 }
711 }
712 }
713 break;
714 case WLAN_EID_RSN:
715 elems->rsn = pos;
716 elems->rsn_len = elen;
717 break;
718 case WLAN_EID_ERP_INFO:
719 elems->erp_info = pos;
720 elems->erp_info_len = elen;
721 break;
722 case WLAN_EID_EXT_SUPP_RATES:
723 elems->ext_supp_rates = pos;
724 elems->ext_supp_rates_len = elen;
725 break;
726 case WLAN_EID_HT_CAPABILITY:
727 if (elen >= sizeof(struct ieee80211_ht_cap))
728 elems->ht_cap_elem = (void *)pos;
729 else
730 elem_parse_failed = true;
731 break;
732 case WLAN_EID_HT_OPERATION:
733 if (elen >= sizeof(struct ieee80211_ht_operation))
734 elems->ht_operation = (void *)pos;
735 else
736 elem_parse_failed = true;
737 break;
738 case WLAN_EID_MESH_ID:
739 elems->mesh_id = pos;
740 elems->mesh_id_len = elen;
741 break;
742 case WLAN_EID_MESH_CONFIG:
743 if (elen >= sizeof(struct ieee80211_meshconf_ie))
744 elems->mesh_config = (void *)pos;
745 else
746 elem_parse_failed = true;
747 break;
748 case WLAN_EID_PEER_MGMT:
749 elems->peering = pos;
750 elems->peering_len = elen;
751 break;
752 case WLAN_EID_PREQ:
753 elems->preq = pos;
754 elems->preq_len = elen;
755 break;
756 case WLAN_EID_PREP:
757 elems->prep = pos;
758 elems->prep_len = elen;
759 break;
760 case WLAN_EID_PERR:
761 elems->perr = pos;
762 elems->perr_len = elen;
763 break;
764 case WLAN_EID_RANN:
765 if (elen >= sizeof(struct ieee80211_rann_ie))
766 elems->rann = (void *)pos;
767 else
768 elem_parse_failed = true;
769 break;
770 case WLAN_EID_CHANNEL_SWITCH:
771 elems->ch_switch_elem = pos;
772 elems->ch_switch_elem_len = elen;
773 break;
774 case WLAN_EID_QUIET:
775 if (!elems->quiet_elem) {
776 elems->quiet_elem = pos;
777 elems->quiet_elem_len = elen;
778 }
779 elems->num_of_quiet_elem++;
780 break;
781 case WLAN_EID_COUNTRY:
782 elems->country_elem = pos;
783 elems->country_elem_len = elen;
784 break;
785 case WLAN_EID_PWR_CONSTRAINT:
786 elems->pwr_constr_elem = pos;
787 elems->pwr_constr_elem_len = elen;
788 break;
789 case WLAN_EID_TIMEOUT_INTERVAL:
790 elems->timeout_int = pos;
791 elems->timeout_int_len = elen;
792 break;
793 default:
794 break;
795 }
796
797 if (elem_parse_failed)
798 elems->parse_error = true;
799 else
800 set_bit(id, seen_elems);
801
802 left -= elen;
803 pos += elen;
804 }
805
806 if (left != 0)
807 elems->parse_error = true;
808
809 return crc;
810 }
811
812 void ieee802_11_parse_elems(u8 *start, size_t len,
813 struct ieee802_11_elems *elems)
814 {
815 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
816 }
817
818 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
819 bool bss_notify)
820 {
821 struct ieee80211_local *local = sdata->local;
822 struct ieee80211_tx_queue_params qparam;
823 int ac;
824 bool use_11b, enable_qos;
825 int aCWmin, aCWmax;
826
827 if (!local->ops->conf_tx)
828 return;
829
830 if (local->hw.queues < IEEE80211_NUM_ACS)
831 return;
832
833 memset(&qparam, 0, sizeof(qparam));
834
835 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
836 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
837
838 /*
839 * By default disable QoS in STA mode for old access points, which do
840 * not support 802.11e. New APs will provide proper queue parameters,
841 * that we will configure later.
842 */
843 enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
844
845 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
846 /* Set defaults according to 802.11-2007 Table 7-37 */
847 aCWmax = 1023;
848 if (use_11b)
849 aCWmin = 31;
850 else
851 aCWmin = 15;
852
853 if (enable_qos) {
854 switch (ac) {
855 case IEEE80211_AC_BK:
856 qparam.cw_max = aCWmax;
857 qparam.cw_min = aCWmin;
858 qparam.txop = 0;
859 qparam.aifs = 7;
860 break;
861 /* never happens but let's not leave undefined */
862 default:
863 case IEEE80211_AC_BE:
864 qparam.cw_max = aCWmax;
865 qparam.cw_min = aCWmin;
866 qparam.txop = 0;
867 qparam.aifs = 3;
868 break;
869 case IEEE80211_AC_VI:
870 qparam.cw_max = aCWmin;
871 qparam.cw_min = (aCWmin + 1) / 2 - 1;
872 if (use_11b)
873 qparam.txop = 6016/32;
874 else
875 qparam.txop = 3008/32;
876 qparam.aifs = 2;
877 break;
878 case IEEE80211_AC_VO:
879 qparam.cw_max = (aCWmin + 1) / 2 - 1;
880 qparam.cw_min = (aCWmin + 1) / 4 - 1;
881 if (use_11b)
882 qparam.txop = 3264/32;
883 else
884 qparam.txop = 1504/32;
885 qparam.aifs = 2;
886 break;
887 }
888 } else {
889 /* Confiure old 802.11b/g medium access rules. */
890 qparam.cw_max = aCWmax;
891 qparam.cw_min = aCWmin;
892 qparam.txop = 0;
893 qparam.aifs = 2;
894 }
895
896 qparam.uapsd = false;
897
898 sdata->tx_conf[ac] = qparam;
899 drv_conf_tx(local, sdata, ac, &qparam);
900 }
901
902 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
903 sdata->vif.bss_conf.qos = enable_qos;
904 if (bss_notify)
905 ieee80211_bss_info_change_notify(sdata,
906 BSS_CHANGED_QOS);
907 }
908 }
909
910 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
911 const size_t supp_rates_len,
912 const u8 *supp_rates)
913 {
914 struct ieee80211_local *local = sdata->local;
915 int i, have_higher_than_11mbit = 0;
916
917 /* cf. IEEE 802.11 9.2.12 */
918 for (i = 0; i < supp_rates_len; i++)
919 if ((supp_rates[i] & 0x7f) * 5 > 110)
920 have_higher_than_11mbit = 1;
921
922 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
923 have_higher_than_11mbit)
924 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
925 else
926 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
927
928 ieee80211_set_wmm_default(sdata, true);
929 }
930
931 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
932 enum ieee80211_band band)
933 {
934 struct ieee80211_supported_band *sband;
935 struct ieee80211_rate *bitrates;
936 u32 mandatory_rates;
937 enum ieee80211_rate_flags mandatory_flag;
938 int i;
939
940 sband = local->hw.wiphy->bands[band];
941 if (WARN_ON(!sband))
942 return 1;
943
944 if (band == IEEE80211_BAND_2GHZ)
945 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
946 else
947 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
948
949 bitrates = sband->bitrates;
950 mandatory_rates = 0;
951 for (i = 0; i < sband->n_bitrates; i++)
952 if (bitrates[i].flags & mandatory_flag)
953 mandatory_rates |= BIT(i);
954 return mandatory_rates;
955 }
956
957 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
958 u16 transaction, u16 auth_alg,
959 u8 *extra, size_t extra_len, const u8 *da,
960 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
961 {
962 struct ieee80211_local *local = sdata->local;
963 struct sk_buff *skb;
964 struct ieee80211_mgmt *mgmt;
965 int err;
966
967 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
968 sizeof(*mgmt) + 6 + extra_len);
969 if (!skb)
970 return;
971
972 skb_reserve(skb, local->hw.extra_tx_headroom);
973
974 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
975 memset(mgmt, 0, 24 + 6);
976 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
977 IEEE80211_STYPE_AUTH);
978 memcpy(mgmt->da, da, ETH_ALEN);
979 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
980 memcpy(mgmt->bssid, bssid, ETH_ALEN);
981 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
982 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
983 mgmt->u.auth.status_code = cpu_to_le16(0);
984 if (extra)
985 memcpy(skb_put(skb, extra_len), extra, extra_len);
986
987 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
988 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
989 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
990 WARN_ON(err);
991 }
992
993 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
994 ieee80211_tx_skb(sdata, skb);
995 }
996
997 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
998 const u8 *ie, size_t ie_len,
999 enum ieee80211_band band, u32 rate_mask,
1000 u8 channel)
1001 {
1002 struct ieee80211_supported_band *sband;
1003 u8 *pos;
1004 size_t offset = 0, noffset;
1005 int supp_rates_len, i;
1006 u8 rates[32];
1007 int num_rates;
1008 int ext_rates_len;
1009
1010 sband = local->hw.wiphy->bands[band];
1011 if (WARN_ON_ONCE(!sband))
1012 return 0;
1013
1014 pos = buffer;
1015
1016 num_rates = 0;
1017 for (i = 0; i < sband->n_bitrates; i++) {
1018 if ((BIT(i) & rate_mask) == 0)
1019 continue; /* skip rate */
1020 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1021 }
1022
1023 supp_rates_len = min_t(int, num_rates, 8);
1024
1025 *pos++ = WLAN_EID_SUPP_RATES;
1026 *pos++ = supp_rates_len;
1027 memcpy(pos, rates, supp_rates_len);
1028 pos += supp_rates_len;
1029
1030 /* insert "request information" if in custom IEs */
1031 if (ie && ie_len) {
1032 static const u8 before_extrates[] = {
1033 WLAN_EID_SSID,
1034 WLAN_EID_SUPP_RATES,
1035 WLAN_EID_REQUEST,
1036 };
1037 noffset = ieee80211_ie_split(ie, ie_len,
1038 before_extrates,
1039 ARRAY_SIZE(before_extrates),
1040 offset);
1041 memcpy(pos, ie + offset, noffset - offset);
1042 pos += noffset - offset;
1043 offset = noffset;
1044 }
1045
1046 ext_rates_len = num_rates - supp_rates_len;
1047 if (ext_rates_len > 0) {
1048 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1049 *pos++ = ext_rates_len;
1050 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1051 pos += ext_rates_len;
1052 }
1053
1054 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1055 *pos++ = WLAN_EID_DS_PARAMS;
1056 *pos++ = 1;
1057 *pos++ = channel;
1058 }
1059
1060 /* insert custom IEs that go before HT */
1061 if (ie && ie_len) {
1062 static const u8 before_ht[] = {
1063 WLAN_EID_SSID,
1064 WLAN_EID_SUPP_RATES,
1065 WLAN_EID_REQUEST,
1066 WLAN_EID_EXT_SUPP_RATES,
1067 WLAN_EID_DS_PARAMS,
1068 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1069 };
1070 noffset = ieee80211_ie_split(ie, ie_len,
1071 before_ht, ARRAY_SIZE(before_ht),
1072 offset);
1073 memcpy(pos, ie + offset, noffset - offset);
1074 pos += noffset - offset;
1075 offset = noffset;
1076 }
1077
1078 if (sband->ht_cap.ht_supported)
1079 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1080 sband->ht_cap.cap);
1081
1082 /*
1083 * If adding more here, adjust code in main.c
1084 * that calculates local->scan_ies_len.
1085 */
1086
1087 /* add any remaining custom IEs */
1088 if (ie && ie_len) {
1089 noffset = ie_len;
1090 memcpy(pos, ie + offset, noffset - offset);
1091 pos += noffset - offset;
1092 }
1093
1094 if (sband->vht_cap.vht_supported)
1095 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1096 sband->vht_cap.cap);
1097
1098 return pos - buffer;
1099 }
1100
1101 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1102 u8 *dst, u32 ratemask,
1103 const u8 *ssid, size_t ssid_len,
1104 const u8 *ie, size_t ie_len,
1105 bool directed)
1106 {
1107 struct ieee80211_local *local = sdata->local;
1108 struct sk_buff *skb;
1109 struct ieee80211_mgmt *mgmt;
1110 size_t buf_len;
1111 u8 *buf;
1112 u8 chan;
1113
1114 /* FIXME: come up with a proper value */
1115 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1116 if (!buf)
1117 return NULL;
1118
1119 /*
1120 * Do not send DS Channel parameter for directed probe requests
1121 * in order to maximize the chance that we get a response. Some
1122 * badly-behaved APs don't respond when this parameter is included.
1123 */
1124 if (directed)
1125 chan = 0;
1126 else
1127 chan = ieee80211_frequency_to_channel(
1128 local->hw.conf.channel->center_freq);
1129
1130 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1131 local->hw.conf.channel->band,
1132 ratemask, chan);
1133
1134 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1135 ssid, ssid_len,
1136 buf, buf_len);
1137 if (!skb)
1138 goto out;
1139
1140 if (dst) {
1141 mgmt = (struct ieee80211_mgmt *) skb->data;
1142 memcpy(mgmt->da, dst, ETH_ALEN);
1143 memcpy(mgmt->bssid, dst, ETH_ALEN);
1144 }
1145
1146 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1147
1148 out:
1149 kfree(buf);
1150
1151 return skb;
1152 }
1153
1154 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1155 const u8 *ssid, size_t ssid_len,
1156 const u8 *ie, size_t ie_len,
1157 u32 ratemask, bool directed, bool no_cck)
1158 {
1159 struct sk_buff *skb;
1160
1161 skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1162 ie, ie_len, directed);
1163 if (skb) {
1164 if (no_cck)
1165 IEEE80211_SKB_CB(skb)->flags |=
1166 IEEE80211_TX_CTL_NO_CCK_RATE;
1167 ieee80211_tx_skb(sdata, skb);
1168 }
1169 }
1170
1171 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1172 struct ieee802_11_elems *elems,
1173 enum ieee80211_band band, u32 *basic_rates)
1174 {
1175 struct ieee80211_supported_band *sband;
1176 struct ieee80211_rate *bitrates;
1177 size_t num_rates;
1178 u32 supp_rates;
1179 int i, j;
1180 sband = local->hw.wiphy->bands[band];
1181
1182 if (WARN_ON(!sband))
1183 return 1;
1184
1185 bitrates = sband->bitrates;
1186 num_rates = sband->n_bitrates;
1187 supp_rates = 0;
1188 for (i = 0; i < elems->supp_rates_len +
1189 elems->ext_supp_rates_len; i++) {
1190 u8 rate = 0;
1191 int own_rate;
1192 bool is_basic;
1193 if (i < elems->supp_rates_len)
1194 rate = elems->supp_rates[i];
1195 else if (elems->ext_supp_rates)
1196 rate = elems->ext_supp_rates
1197 [i - elems->supp_rates_len];
1198 own_rate = 5 * (rate & 0x7f);
1199 is_basic = !!(rate & 0x80);
1200
1201 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1202 continue;
1203
1204 for (j = 0; j < num_rates; j++) {
1205 if (bitrates[j].bitrate == own_rate) {
1206 supp_rates |= BIT(j);
1207 if (basic_rates && is_basic)
1208 *basic_rates |= BIT(j);
1209 }
1210 }
1211 }
1212 return supp_rates;
1213 }
1214
1215 void ieee80211_stop_device(struct ieee80211_local *local)
1216 {
1217 ieee80211_led_radio(local, false);
1218 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1219
1220 cancel_work_sync(&local->reconfig_filter);
1221
1222 flush_workqueue(local->workqueue);
1223 drv_stop(local);
1224 }
1225
1226 int ieee80211_reconfig(struct ieee80211_local *local)
1227 {
1228 struct ieee80211_hw *hw = &local->hw;
1229 struct ieee80211_sub_if_data *sdata;
1230 struct sta_info *sta;
1231 int res, i;
1232
1233 #ifdef CONFIG_PM
1234 if (local->suspended)
1235 local->resuming = true;
1236
1237 if (local->wowlan) {
1238 local->wowlan = false;
1239 res = drv_resume(local);
1240 if (res < 0) {
1241 local->resuming = false;
1242 return res;
1243 }
1244 if (res == 0)
1245 goto wake_up;
1246 WARN_ON(res > 1);
1247 /*
1248 * res is 1, which means the driver requested
1249 * to go through a regular reset on wakeup.
1250 */
1251 }
1252 #endif
1253 /* everything else happens only if HW was up & running */
1254 if (!local->open_count)
1255 goto wake_up;
1256
1257 /*
1258 * Upon resume hardware can sometimes be goofy due to
1259 * various platform / driver / bus issues, so restarting
1260 * the device may at times not work immediately. Propagate
1261 * the error.
1262 */
1263 res = drv_start(local);
1264 if (res) {
1265 WARN(local->suspended, "Hardware became unavailable "
1266 "upon resume. This could be a software issue "
1267 "prior to suspend or a hardware issue.\n");
1268 return res;
1269 }
1270
1271 /* setup fragmentation threshold */
1272 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1273
1274 /* setup RTS threshold */
1275 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1276
1277 /* reset coverage class */
1278 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1279
1280 ieee80211_led_radio(local, true);
1281 ieee80211_mod_tpt_led_trig(local,
1282 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1283
1284 /* add interfaces */
1285 sdata = rtnl_dereference(local->monitor_sdata);
1286 if (sdata) {
1287 res = drv_add_interface(local, sdata);
1288 if (WARN_ON(res)) {
1289 rcu_assign_pointer(local->monitor_sdata, NULL);
1290 synchronize_net();
1291 kfree(sdata);
1292 }
1293 }
1294
1295 list_for_each_entry(sdata, &local->interfaces, list) {
1296 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1297 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1298 ieee80211_sdata_running(sdata))
1299 res = drv_add_interface(local, sdata);
1300 }
1301
1302 /* add STAs back */
1303 mutex_lock(&local->sta_mtx);
1304 list_for_each_entry(sta, &local->sta_list, list) {
1305 enum ieee80211_sta_state state;
1306
1307 if (!sta->uploaded)
1308 continue;
1309
1310 /* AP-mode stations will be added later */
1311 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1312 continue;
1313
1314 for (state = IEEE80211_STA_NOTEXIST;
1315 state < sta->sta_state; state++)
1316 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1317 state + 1));
1318 }
1319 mutex_unlock(&local->sta_mtx);
1320
1321 /* reconfigure tx conf */
1322 if (hw->queues >= IEEE80211_NUM_ACS) {
1323 list_for_each_entry(sdata, &local->interfaces, list) {
1324 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1325 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1326 !ieee80211_sdata_running(sdata))
1327 continue;
1328
1329 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1330 drv_conf_tx(local, sdata, i,
1331 &sdata->tx_conf[i]);
1332 }
1333 }
1334
1335 /* reconfigure hardware */
1336 ieee80211_hw_config(local, ~0);
1337
1338 ieee80211_configure_filter(local);
1339
1340 /* Finally also reconfigure all the BSS information */
1341 list_for_each_entry(sdata, &local->interfaces, list) {
1342 u32 changed;
1343
1344 if (!ieee80211_sdata_running(sdata))
1345 continue;
1346
1347 /* common change flags for all interface types */
1348 changed = BSS_CHANGED_ERP_CTS_PROT |
1349 BSS_CHANGED_ERP_PREAMBLE |
1350 BSS_CHANGED_ERP_SLOT |
1351 BSS_CHANGED_HT |
1352 BSS_CHANGED_BASIC_RATES |
1353 BSS_CHANGED_BEACON_INT |
1354 BSS_CHANGED_BSSID |
1355 BSS_CHANGED_CQM |
1356 BSS_CHANGED_QOS |
1357 BSS_CHANGED_IDLE;
1358
1359 switch (sdata->vif.type) {
1360 case NL80211_IFTYPE_STATION:
1361 changed |= BSS_CHANGED_ASSOC |
1362 BSS_CHANGED_ARP_FILTER |
1363 BSS_CHANGED_PS;
1364 mutex_lock(&sdata->u.mgd.mtx);
1365 ieee80211_bss_info_change_notify(sdata, changed);
1366 mutex_unlock(&sdata->u.mgd.mtx);
1367 break;
1368 case NL80211_IFTYPE_ADHOC:
1369 changed |= BSS_CHANGED_IBSS;
1370 /* fall through */
1371 case NL80211_IFTYPE_AP:
1372 changed |= BSS_CHANGED_SSID;
1373
1374 if (sdata->vif.type == NL80211_IFTYPE_AP)
1375 changed |= BSS_CHANGED_AP_PROBE_RESP;
1376
1377 /* fall through */
1378 case NL80211_IFTYPE_MESH_POINT:
1379 changed |= BSS_CHANGED_BEACON |
1380 BSS_CHANGED_BEACON_ENABLED;
1381 ieee80211_bss_info_change_notify(sdata, changed);
1382 break;
1383 case NL80211_IFTYPE_WDS:
1384 break;
1385 case NL80211_IFTYPE_AP_VLAN:
1386 case NL80211_IFTYPE_MONITOR:
1387 /* ignore virtual */
1388 break;
1389 case NL80211_IFTYPE_UNSPECIFIED:
1390 case NUM_NL80211_IFTYPES:
1391 case NL80211_IFTYPE_P2P_CLIENT:
1392 case NL80211_IFTYPE_P2P_GO:
1393 WARN_ON(1);
1394 break;
1395 }
1396 }
1397
1398 ieee80211_recalc_ps(local, -1);
1399
1400 /*
1401 * The sta might be in psm against the ap (e.g. because
1402 * this was the state before a hw restart), so we
1403 * explicitly send a null packet in order to make sure
1404 * it'll sync against the ap (and get out of psm).
1405 */
1406 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1407 list_for_each_entry(sdata, &local->interfaces, list) {
1408 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1409 continue;
1410
1411 ieee80211_send_nullfunc(local, sdata, 0);
1412 }
1413 }
1414
1415 /* APs are now beaconing, add back stations */
1416 mutex_lock(&local->sta_mtx);
1417 list_for_each_entry(sta, &local->sta_list, list) {
1418 enum ieee80211_sta_state state;
1419
1420 if (!sta->uploaded)
1421 continue;
1422
1423 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1424 continue;
1425
1426 for (state = IEEE80211_STA_NOTEXIST;
1427 state < sta->sta_state; state++)
1428 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1429 state + 1));
1430 }
1431 mutex_unlock(&local->sta_mtx);
1432
1433 /* add back keys */
1434 list_for_each_entry(sdata, &local->interfaces, list)
1435 if (ieee80211_sdata_running(sdata))
1436 ieee80211_enable_keys(sdata);
1437
1438 wake_up:
1439 local->in_reconfig = false;
1440 barrier();
1441
1442 /*
1443 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1444 * sessions can be established after a resume.
1445 *
1446 * Also tear down aggregation sessions since reconfiguring
1447 * them in a hardware restart scenario is not easily done
1448 * right now, and the hardware will have lost information
1449 * about the sessions, but we and the AP still think they
1450 * are active. This is really a workaround though.
1451 */
1452 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1453 mutex_lock(&local->sta_mtx);
1454
1455 list_for_each_entry(sta, &local->sta_list, list) {
1456 ieee80211_sta_tear_down_BA_sessions(sta, true);
1457 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1458 }
1459
1460 mutex_unlock(&local->sta_mtx);
1461 }
1462
1463 ieee80211_wake_queues_by_reason(hw,
1464 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1465
1466 /*
1467 * If this is for hw restart things are still running.
1468 * We may want to change that later, however.
1469 */
1470 if (!local->suspended)
1471 return 0;
1472
1473 #ifdef CONFIG_PM
1474 /* first set suspended false, then resuming */
1475 local->suspended = false;
1476 mb();
1477 local->resuming = false;
1478
1479 list_for_each_entry(sdata, &local->interfaces, list) {
1480 switch(sdata->vif.type) {
1481 case NL80211_IFTYPE_STATION:
1482 ieee80211_sta_restart(sdata);
1483 break;
1484 case NL80211_IFTYPE_ADHOC:
1485 ieee80211_ibss_restart(sdata);
1486 break;
1487 case NL80211_IFTYPE_MESH_POINT:
1488 ieee80211_mesh_restart(sdata);
1489 break;
1490 default:
1491 break;
1492 }
1493 }
1494
1495 mod_timer(&local->sta_cleanup, jiffies + 1);
1496
1497 mutex_lock(&local->sta_mtx);
1498 list_for_each_entry(sta, &local->sta_list, list)
1499 mesh_plink_restart(sta);
1500 mutex_unlock(&local->sta_mtx);
1501 #else
1502 WARN_ON(1);
1503 #endif
1504 return 0;
1505 }
1506
1507 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1508 {
1509 struct ieee80211_sub_if_data *sdata;
1510 struct ieee80211_local *local;
1511 struct ieee80211_key *key;
1512
1513 if (WARN_ON(!vif))
1514 return;
1515
1516 sdata = vif_to_sdata(vif);
1517 local = sdata->local;
1518
1519 if (WARN_ON(!local->resuming))
1520 return;
1521
1522 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1523 return;
1524
1525 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1526
1527 mutex_lock(&local->key_mtx);
1528 list_for_each_entry(key, &sdata->key_list, list)
1529 key->flags |= KEY_FLAG_TAINTED;
1530 mutex_unlock(&local->key_mtx);
1531 }
1532 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1533
1534 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1535 enum ieee80211_smps_mode *smps_mode)
1536 {
1537 if (ifmgd->associated) {
1538 *smps_mode = ifmgd->ap_smps;
1539
1540 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1541 if (ifmgd->powersave)
1542 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1543 else
1544 *smps_mode = IEEE80211_SMPS_OFF;
1545 }
1546
1547 return 1;
1548 }
1549
1550 return 0;
1551 }
1552
1553 /* must hold iflist_mtx */
1554 void ieee80211_recalc_smps(struct ieee80211_local *local)
1555 {
1556 struct ieee80211_sub_if_data *sdata;
1557 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1558 int count = 0;
1559
1560 lockdep_assert_held(&local->iflist_mtx);
1561
1562 /*
1563 * This function could be improved to handle multiple
1564 * interfaces better, but right now it makes any
1565 * non-station interfaces force SM PS to be turned
1566 * off. If there are multiple station interfaces it
1567 * could also use the best possible mode, e.g. if
1568 * one is in static and the other in dynamic then
1569 * dynamic is ok.
1570 */
1571
1572 list_for_each_entry(sdata, &local->interfaces, list) {
1573 if (!ieee80211_sdata_running(sdata))
1574 continue;
1575 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1576 goto set;
1577
1578 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1579
1580 if (count > 1) {
1581 smps_mode = IEEE80211_SMPS_OFF;
1582 break;
1583 }
1584 }
1585
1586 if (smps_mode == local->smps_mode)
1587 return;
1588
1589 set:
1590 local->smps_mode = smps_mode;
1591 /* changed flag is auto-detected for this */
1592 ieee80211_hw_config(local, 0);
1593 }
1594
1595 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1596 {
1597 int i;
1598
1599 for (i = 0; i < n_ids; i++)
1600 if (ids[i] == id)
1601 return true;
1602 return false;
1603 }
1604
1605 /**
1606 * ieee80211_ie_split - split an IE buffer according to ordering
1607 *
1608 * @ies: the IE buffer
1609 * @ielen: the length of the IE buffer
1610 * @ids: an array with element IDs that are allowed before
1611 * the split
1612 * @n_ids: the size of the element ID array
1613 * @offset: offset where to start splitting in the buffer
1614 *
1615 * This function splits an IE buffer by updating the @offset
1616 * variable to point to the location where the buffer should be
1617 * split.
1618 *
1619 * It assumes that the given IE buffer is well-formed, this
1620 * has to be guaranteed by the caller!
1621 *
1622 * It also assumes that the IEs in the buffer are ordered
1623 * correctly, if not the result of using this function will not
1624 * be ordered correctly either, i.e. it does no reordering.
1625 *
1626 * The function returns the offset where the next part of the
1627 * buffer starts, which may be @ielen if the entire (remainder)
1628 * of the buffer should be used.
1629 */
1630 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1631 const u8 *ids, int n_ids, size_t offset)
1632 {
1633 size_t pos = offset;
1634
1635 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1636 pos += 2 + ies[pos + 1];
1637
1638 return pos;
1639 }
1640
1641 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1642 {
1643 size_t pos = offset;
1644
1645 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1646 pos += 2 + ies[pos + 1];
1647
1648 return pos;
1649 }
1650
1651 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1652 int rssi_min_thold,
1653 int rssi_max_thold)
1654 {
1655 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1656
1657 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1658 return;
1659
1660 /*
1661 * Scale up threshold values before storing it, as the RSSI averaging
1662 * algorithm uses a scaled up value as well. Change this scaling
1663 * factor if the RSSI averaging algorithm changes.
1664 */
1665 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1666 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1667 }
1668
1669 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1670 int rssi_min_thold,
1671 int rssi_max_thold)
1672 {
1673 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1674
1675 WARN_ON(rssi_min_thold == rssi_max_thold ||
1676 rssi_min_thold > rssi_max_thold);
1677
1678 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1679 rssi_max_thold);
1680 }
1681 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1682
1683 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1684 {
1685 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1686
1687 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1688 }
1689 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1690
1691 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1692 u16 cap)
1693 {
1694 __le16 tmp;
1695
1696 *pos++ = WLAN_EID_HT_CAPABILITY;
1697 *pos++ = sizeof(struct ieee80211_ht_cap);
1698 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1699
1700 /* capability flags */
1701 tmp = cpu_to_le16(cap);
1702 memcpy(pos, &tmp, sizeof(u16));
1703 pos += sizeof(u16);
1704
1705 /* AMPDU parameters */
1706 *pos++ = ht_cap->ampdu_factor |
1707 (ht_cap->ampdu_density <<
1708 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1709
1710 /* MCS set */
1711 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1712 pos += sizeof(ht_cap->mcs);
1713
1714 /* extended capabilities */
1715 pos += sizeof(__le16);
1716
1717 /* BF capabilities */
1718 pos += sizeof(__le32);
1719
1720 /* antenna selection */
1721 pos += sizeof(u8);
1722
1723 return pos;
1724 }
1725
1726 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1727 u32 cap)
1728 {
1729 __le32 tmp;
1730
1731 *pos++ = WLAN_EID_VHT_CAPABILITY;
1732 *pos++ = sizeof(struct ieee80211_vht_capabilities);
1733 memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1734
1735 /* capability flags */
1736 tmp = cpu_to_le32(cap);
1737 memcpy(pos, &tmp, sizeof(u32));
1738 pos += sizeof(u32);
1739
1740 /* VHT MCS set */
1741 memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1742 pos += sizeof(vht_cap->vht_mcs);
1743
1744 return pos;
1745 }
1746
1747 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1748 struct ieee80211_channel *channel,
1749 enum nl80211_channel_type channel_type,
1750 u16 prot_mode)
1751 {
1752 struct ieee80211_ht_operation *ht_oper;
1753 /* Build HT Information */
1754 *pos++ = WLAN_EID_HT_OPERATION;
1755 *pos++ = sizeof(struct ieee80211_ht_operation);
1756 ht_oper = (struct ieee80211_ht_operation *)pos;
1757 ht_oper->primary_chan =
1758 ieee80211_frequency_to_channel(channel->center_freq);
1759 switch (channel_type) {
1760 case NL80211_CHAN_HT40MINUS:
1761 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1762 break;
1763 case NL80211_CHAN_HT40PLUS:
1764 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1765 break;
1766 case NL80211_CHAN_HT20:
1767 default:
1768 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1769 break;
1770 }
1771 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1772 channel_type != NL80211_CHAN_NO_HT &&
1773 channel_type != NL80211_CHAN_HT20)
1774 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1775
1776 ht_oper->operation_mode = cpu_to_le16(prot_mode);
1777 ht_oper->stbc_param = 0x0000;
1778
1779 /* It seems that Basic MCS set and Supported MCS set
1780 are identical for the first 10 bytes */
1781 memset(&ht_oper->basic_set, 0, 16);
1782 memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1783
1784 return pos + sizeof(struct ieee80211_ht_operation);
1785 }
1786
1787 enum nl80211_channel_type
1788 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1789 {
1790 enum nl80211_channel_type channel_type;
1791
1792 if (!ht_oper)
1793 return NL80211_CHAN_NO_HT;
1794
1795 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1796 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1797 channel_type = NL80211_CHAN_HT20;
1798 break;
1799 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1800 channel_type = NL80211_CHAN_HT40PLUS;
1801 break;
1802 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1803 channel_type = NL80211_CHAN_HT40MINUS;
1804 break;
1805 default:
1806 channel_type = NL80211_CHAN_NO_HT;
1807 }
1808
1809 return channel_type;
1810 }
1811
1812 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1813 struct sk_buff *skb, bool need_basic)
1814 {
1815 struct ieee80211_local *local = sdata->local;
1816 struct ieee80211_supported_band *sband;
1817 int rate;
1818 u8 i, rates, *pos;
1819 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1820
1821 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1822 rates = sband->n_bitrates;
1823 if (rates > 8)
1824 rates = 8;
1825
1826 if (skb_tailroom(skb) < rates + 2)
1827 return -ENOMEM;
1828
1829 pos = skb_put(skb, rates + 2);
1830 *pos++ = WLAN_EID_SUPP_RATES;
1831 *pos++ = rates;
1832 for (i = 0; i < rates; i++) {
1833 u8 basic = 0;
1834 if (need_basic && basic_rates & BIT(i))
1835 basic = 0x80;
1836 rate = sband->bitrates[i].bitrate;
1837 *pos++ = basic | (u8) (rate / 5);
1838 }
1839
1840 return 0;
1841 }
1842
1843 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1844 struct sk_buff *skb, bool need_basic)
1845 {
1846 struct ieee80211_local *local = sdata->local;
1847 struct ieee80211_supported_band *sband;
1848 int rate;
1849 u8 i, exrates, *pos;
1850 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1851
1852 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1853 exrates = sband->n_bitrates;
1854 if (exrates > 8)
1855 exrates -= 8;
1856 else
1857 exrates = 0;
1858
1859 if (skb_tailroom(skb) < exrates + 2)
1860 return -ENOMEM;
1861
1862 if (exrates) {
1863 pos = skb_put(skb, exrates + 2);
1864 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1865 *pos++ = exrates;
1866 for (i = 8; i < sband->n_bitrates; i++) {
1867 u8 basic = 0;
1868 if (need_basic && basic_rates & BIT(i))
1869 basic = 0x80;
1870 rate = sband->bitrates[i].bitrate;
1871 *pos++ = basic | (u8) (rate / 5);
1872 }
1873 }
1874 return 0;
1875 }
1876
1877 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1878 {
1879 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1880 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1881
1882 if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1883 /* non-managed type inferfaces */
1884 return 0;
1885 }
1886 return ifmgd->ave_beacon_signal;
1887 }
1888 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
Linux kernel - Deliverables
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