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mac80211: support P2P Device abstraction
[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 (!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 elems->pwr_constr_elem = pos;
796 elems->pwr_constr_elem_len = elen;
797 break;
798 case WLAN_EID_TIMEOUT_INTERVAL:
799 elems->timeout_int = pos;
800 elems->timeout_int_len = elen;
801 break;
802 default:
803 break;
804 }
805
806 if (elem_parse_failed)
807 elems->parse_error = true;
808 else
809 set_bit(id, seen_elems);
810
811 left -= elen;
812 pos += elen;
813 }
814
815 if (left != 0)
816 elems->parse_error = true;
817
818 return crc;
819 }
820
821 void ieee802_11_parse_elems(u8 *start, size_t len,
822 struct ieee802_11_elems *elems)
823 {
824 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
825 }
826
827 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
828 bool bss_notify)
829 {
830 struct ieee80211_local *local = sdata->local;
831 struct ieee80211_tx_queue_params qparam;
832 int ac;
833 bool use_11b, enable_qos;
834 int aCWmin, aCWmax;
835
836 if (!local->ops->conf_tx)
837 return;
838
839 if (local->hw.queues < IEEE80211_NUM_ACS)
840 return;
841
842 memset(&qparam, 0, sizeof(qparam));
843
844 use_11b = (local->oper_channel->band == IEEE80211_BAND_2GHZ) &&
845 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
846
847 /*
848 * By default disable QoS in STA mode for old access points, which do
849 * not support 802.11e. New APs will provide proper queue parameters,
850 * that we will configure later.
851 */
852 enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
853
854 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
855 /* Set defaults according to 802.11-2007 Table 7-37 */
856 aCWmax = 1023;
857 if (use_11b)
858 aCWmin = 31;
859 else
860 aCWmin = 15;
861
862 if (enable_qos) {
863 switch (ac) {
864 case IEEE80211_AC_BK:
865 qparam.cw_max = aCWmax;
866 qparam.cw_min = aCWmin;
867 qparam.txop = 0;
868 qparam.aifs = 7;
869 break;
870 /* never happens but let's not leave undefined */
871 default:
872 case IEEE80211_AC_BE:
873 qparam.cw_max = aCWmax;
874 qparam.cw_min = aCWmin;
875 qparam.txop = 0;
876 qparam.aifs = 3;
877 break;
878 case IEEE80211_AC_VI:
879 qparam.cw_max = aCWmin;
880 qparam.cw_min = (aCWmin + 1) / 2 - 1;
881 if (use_11b)
882 qparam.txop = 6016/32;
883 else
884 qparam.txop = 3008/32;
885 qparam.aifs = 2;
886 break;
887 case IEEE80211_AC_VO:
888 qparam.cw_max = (aCWmin + 1) / 2 - 1;
889 qparam.cw_min = (aCWmin + 1) / 4 - 1;
890 if (use_11b)
891 qparam.txop = 3264/32;
892 else
893 qparam.txop = 1504/32;
894 qparam.aifs = 2;
895 break;
896 }
897 } else {
898 /* Confiure old 802.11b/g medium access rules. */
899 qparam.cw_max = aCWmax;
900 qparam.cw_min = aCWmin;
901 qparam.txop = 0;
902 qparam.aifs = 2;
903 }
904
905 qparam.uapsd = false;
906
907 sdata->tx_conf[ac] = qparam;
908 drv_conf_tx(local, sdata, ac, &qparam);
909 }
910
911 if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
912 sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
913 sdata->vif.bss_conf.qos = enable_qos;
914 if (bss_notify)
915 ieee80211_bss_info_change_notify(sdata,
916 BSS_CHANGED_QOS);
917 }
918 }
919
920 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
921 const size_t supp_rates_len,
922 const u8 *supp_rates)
923 {
924 struct ieee80211_local *local = sdata->local;
925 int i, have_higher_than_11mbit = 0;
926
927 /* cf. IEEE 802.11 9.2.12 */
928 for (i = 0; i < supp_rates_len; i++)
929 if ((supp_rates[i] & 0x7f) * 5 > 110)
930 have_higher_than_11mbit = 1;
931
932 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
933 have_higher_than_11mbit)
934 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
935 else
936 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
937
938 ieee80211_set_wmm_default(sdata, true);
939 }
940
941 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
942 enum ieee80211_band band)
943 {
944 struct ieee80211_supported_band *sband;
945 struct ieee80211_rate *bitrates;
946 u32 mandatory_rates;
947 enum ieee80211_rate_flags mandatory_flag;
948 int i;
949
950 sband = local->hw.wiphy->bands[band];
951 if (WARN_ON(!sband))
952 return 1;
953
954 if (band == IEEE80211_BAND_2GHZ)
955 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
956 else
957 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
958
959 bitrates = sband->bitrates;
960 mandatory_rates = 0;
961 for (i = 0; i < sband->n_bitrates; i++)
962 if (bitrates[i].flags & mandatory_flag)
963 mandatory_rates |= BIT(i);
964 return mandatory_rates;
965 }
966
967 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
968 u16 transaction, u16 auth_alg,
969 u8 *extra, size_t extra_len, const u8 *da,
970 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
971 {
972 struct ieee80211_local *local = sdata->local;
973 struct sk_buff *skb;
974 struct ieee80211_mgmt *mgmt;
975 int err;
976
977 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
978 sizeof(*mgmt) + 6 + extra_len);
979 if (!skb)
980 return;
981
982 skb_reserve(skb, local->hw.extra_tx_headroom);
983
984 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
985 memset(mgmt, 0, 24 + 6);
986 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
987 IEEE80211_STYPE_AUTH);
988 memcpy(mgmt->da, da, ETH_ALEN);
989 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
990 memcpy(mgmt->bssid, bssid, ETH_ALEN);
991 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
992 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
993 mgmt->u.auth.status_code = cpu_to_le16(0);
994 if (extra)
995 memcpy(skb_put(skb, extra_len), extra, extra_len);
996
997 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
998 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
999 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1000 WARN_ON(err);
1001 }
1002
1003 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1004 ieee80211_tx_skb(sdata, skb);
1005 }
1006
1007 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1008 const u8 *ie, size_t ie_len,
1009 enum ieee80211_band band, u32 rate_mask,
1010 u8 channel)
1011 {
1012 struct ieee80211_supported_band *sband;
1013 u8 *pos;
1014 size_t offset = 0, noffset;
1015 int supp_rates_len, i;
1016 u8 rates[32];
1017 int num_rates;
1018 int ext_rates_len;
1019
1020 sband = local->hw.wiphy->bands[band];
1021 if (WARN_ON_ONCE(!sband))
1022 return 0;
1023
1024 pos = buffer;
1025
1026 num_rates = 0;
1027 for (i = 0; i < sband->n_bitrates; i++) {
1028 if ((BIT(i) & rate_mask) == 0)
1029 continue; /* skip rate */
1030 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1031 }
1032
1033 supp_rates_len = min_t(int, num_rates, 8);
1034
1035 *pos++ = WLAN_EID_SUPP_RATES;
1036 *pos++ = supp_rates_len;
1037 memcpy(pos, rates, supp_rates_len);
1038 pos += supp_rates_len;
1039
1040 /* insert "request information" if in custom IEs */
1041 if (ie && ie_len) {
1042 static const u8 before_extrates[] = {
1043 WLAN_EID_SSID,
1044 WLAN_EID_SUPP_RATES,
1045 WLAN_EID_REQUEST,
1046 };
1047 noffset = ieee80211_ie_split(ie, ie_len,
1048 before_extrates,
1049 ARRAY_SIZE(before_extrates),
1050 offset);
1051 memcpy(pos, ie + offset, noffset - offset);
1052 pos += noffset - offset;
1053 offset = noffset;
1054 }
1055
1056 ext_rates_len = num_rates - supp_rates_len;
1057 if (ext_rates_len > 0) {
1058 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1059 *pos++ = ext_rates_len;
1060 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1061 pos += ext_rates_len;
1062 }
1063
1064 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1065 *pos++ = WLAN_EID_DS_PARAMS;
1066 *pos++ = 1;
1067 *pos++ = channel;
1068 }
1069
1070 /* insert custom IEs that go before HT */
1071 if (ie && ie_len) {
1072 static const u8 before_ht[] = {
1073 WLAN_EID_SSID,
1074 WLAN_EID_SUPP_RATES,
1075 WLAN_EID_REQUEST,
1076 WLAN_EID_EXT_SUPP_RATES,
1077 WLAN_EID_DS_PARAMS,
1078 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1079 };
1080 noffset = ieee80211_ie_split(ie, ie_len,
1081 before_ht, ARRAY_SIZE(before_ht),
1082 offset);
1083 memcpy(pos, ie + offset, noffset - offset);
1084 pos += noffset - offset;
1085 offset = noffset;
1086 }
1087
1088 if (sband->ht_cap.ht_supported)
1089 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1090 sband->ht_cap.cap);
1091
1092 /*
1093 * If adding more here, adjust code in main.c
1094 * that calculates local->scan_ies_len.
1095 */
1096
1097 /* add any remaining custom IEs */
1098 if (ie && ie_len) {
1099 noffset = ie_len;
1100 memcpy(pos, ie + offset, noffset - offset);
1101 pos += noffset - offset;
1102 }
1103
1104 if (sband->vht_cap.vht_supported)
1105 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1106 sband->vht_cap.cap);
1107
1108 return pos - buffer;
1109 }
1110
1111 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1112 u8 *dst, u32 ratemask,
1113 struct ieee80211_channel *chan,
1114 const u8 *ssid, size_t ssid_len,
1115 const u8 *ie, size_t ie_len,
1116 bool directed)
1117 {
1118 struct ieee80211_local *local = sdata->local;
1119 struct sk_buff *skb;
1120 struct ieee80211_mgmt *mgmt;
1121 size_t buf_len;
1122 u8 *buf;
1123 u8 chan_no;
1124
1125 /* FIXME: come up with a proper value */
1126 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1127 if (!buf)
1128 return NULL;
1129
1130 /*
1131 * Do not send DS Channel parameter for directed probe requests
1132 * in order to maximize the chance that we get a response. Some
1133 * badly-behaved APs don't respond when this parameter is included.
1134 */
1135 if (directed)
1136 chan_no = 0;
1137 else
1138 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1139
1140 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len, chan->band,
1141 ratemask, chan_no);
1142
1143 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1144 ssid, ssid_len,
1145 buf, buf_len);
1146 if (!skb)
1147 goto out;
1148
1149 if (dst) {
1150 mgmt = (struct ieee80211_mgmt *) skb->data;
1151 memcpy(mgmt->da, dst, ETH_ALEN);
1152 memcpy(mgmt->bssid, dst, ETH_ALEN);
1153 }
1154
1155 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1156
1157 out:
1158 kfree(buf);
1159
1160 return skb;
1161 }
1162
1163 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1164 const u8 *ssid, size_t ssid_len,
1165 const u8 *ie, size_t ie_len,
1166 u32 ratemask, bool directed, bool no_cck)
1167 {
1168 struct sk_buff *skb;
1169
1170 skb = ieee80211_build_probe_req(sdata, dst, ratemask,
1171 sdata->local->hw.conf.channel,
1172 ssid, ssid_len,
1173 ie, ie_len, directed);
1174 if (skb) {
1175 if (no_cck)
1176 IEEE80211_SKB_CB(skb)->flags |=
1177 IEEE80211_TX_CTL_NO_CCK_RATE;
1178 ieee80211_tx_skb(sdata, skb);
1179 }
1180 }
1181
1182 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1183 struct ieee802_11_elems *elems,
1184 enum ieee80211_band band, u32 *basic_rates)
1185 {
1186 struct ieee80211_supported_band *sband;
1187 struct ieee80211_rate *bitrates;
1188 size_t num_rates;
1189 u32 supp_rates;
1190 int i, j;
1191 sband = local->hw.wiphy->bands[band];
1192
1193 if (WARN_ON(!sband))
1194 return 1;
1195
1196 bitrates = sband->bitrates;
1197 num_rates = sband->n_bitrates;
1198 supp_rates = 0;
1199 for (i = 0; i < elems->supp_rates_len +
1200 elems->ext_supp_rates_len; i++) {
1201 u8 rate = 0;
1202 int own_rate;
1203 bool is_basic;
1204 if (i < elems->supp_rates_len)
1205 rate = elems->supp_rates[i];
1206 else if (elems->ext_supp_rates)
1207 rate = elems->ext_supp_rates
1208 [i - elems->supp_rates_len];
1209 own_rate = 5 * (rate & 0x7f);
1210 is_basic = !!(rate & 0x80);
1211
1212 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1213 continue;
1214
1215 for (j = 0; j < num_rates; j++) {
1216 if (bitrates[j].bitrate == own_rate) {
1217 supp_rates |= BIT(j);
1218 if (basic_rates && is_basic)
1219 *basic_rates |= BIT(j);
1220 }
1221 }
1222 }
1223 return supp_rates;
1224 }
1225
1226 void ieee80211_stop_device(struct ieee80211_local *local)
1227 {
1228 ieee80211_led_radio(local, false);
1229 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1230
1231 cancel_work_sync(&local->reconfig_filter);
1232
1233 flush_workqueue(local->workqueue);
1234 drv_stop(local);
1235 }
1236
1237 int ieee80211_reconfig(struct ieee80211_local *local)
1238 {
1239 struct ieee80211_hw *hw = &local->hw;
1240 struct ieee80211_sub_if_data *sdata;
1241 struct sta_info *sta;
1242 int res, i;
1243
1244 #ifdef CONFIG_PM
1245 if (local->suspended)
1246 local->resuming = true;
1247
1248 if (local->wowlan) {
1249 local->wowlan = false;
1250 res = drv_resume(local);
1251 if (res < 0) {
1252 local->resuming = false;
1253 return res;
1254 }
1255 if (res == 0)
1256 goto wake_up;
1257 WARN_ON(res > 1);
1258 /*
1259 * res is 1, which means the driver requested
1260 * to go through a regular reset on wakeup.
1261 */
1262 }
1263 #endif
1264 /* everything else happens only if HW was up & running */
1265 if (!local->open_count)
1266 goto wake_up;
1267
1268 /*
1269 * Upon resume hardware can sometimes be goofy due to
1270 * various platform / driver / bus issues, so restarting
1271 * the device may at times not work immediately. Propagate
1272 * the error.
1273 */
1274 res = drv_start(local);
1275 if (res) {
1276 WARN(local->suspended, "Hardware became unavailable "
1277 "upon resume. This could be a software issue "
1278 "prior to suspend or a hardware issue.\n");
1279 return res;
1280 }
1281
1282 /* setup fragmentation threshold */
1283 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1284
1285 /* setup RTS threshold */
1286 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1287
1288 /* reset coverage class */
1289 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1290
1291 ieee80211_led_radio(local, true);
1292 ieee80211_mod_tpt_led_trig(local,
1293 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1294
1295 /* add interfaces */
1296 sdata = rtnl_dereference(local->monitor_sdata);
1297 if (sdata) {
1298 res = drv_add_interface(local, sdata);
1299 if (WARN_ON(res)) {
1300 rcu_assign_pointer(local->monitor_sdata, NULL);
1301 synchronize_net();
1302 kfree(sdata);
1303 }
1304 }
1305
1306 list_for_each_entry(sdata, &local->interfaces, list) {
1307 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1308 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1309 ieee80211_sdata_running(sdata))
1310 res = drv_add_interface(local, sdata);
1311 }
1312
1313 /* add STAs back */
1314 mutex_lock(&local->sta_mtx);
1315 list_for_each_entry(sta, &local->sta_list, list) {
1316 enum ieee80211_sta_state state;
1317
1318 if (!sta->uploaded)
1319 continue;
1320
1321 /* AP-mode stations will be added later */
1322 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1323 continue;
1324
1325 for (state = IEEE80211_STA_NOTEXIST;
1326 state < sta->sta_state; state++)
1327 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1328 state + 1));
1329 }
1330 mutex_unlock(&local->sta_mtx);
1331
1332 /* reconfigure tx conf */
1333 if (hw->queues >= IEEE80211_NUM_ACS) {
1334 list_for_each_entry(sdata, &local->interfaces, list) {
1335 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1336 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1337 !ieee80211_sdata_running(sdata))
1338 continue;
1339
1340 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1341 drv_conf_tx(local, sdata, i,
1342 &sdata->tx_conf[i]);
1343 }
1344 }
1345
1346 /* reconfigure hardware */
1347 ieee80211_hw_config(local, ~0);
1348
1349 ieee80211_configure_filter(local);
1350
1351 /* Finally also reconfigure all the BSS information */
1352 list_for_each_entry(sdata, &local->interfaces, list) {
1353 u32 changed;
1354
1355 if (!ieee80211_sdata_running(sdata))
1356 continue;
1357
1358 /* common change flags for all interface types */
1359 changed = BSS_CHANGED_ERP_CTS_PROT |
1360 BSS_CHANGED_ERP_PREAMBLE |
1361 BSS_CHANGED_ERP_SLOT |
1362 BSS_CHANGED_HT |
1363 BSS_CHANGED_BASIC_RATES |
1364 BSS_CHANGED_BEACON_INT |
1365 BSS_CHANGED_BSSID |
1366 BSS_CHANGED_CQM |
1367 BSS_CHANGED_QOS |
1368 BSS_CHANGED_IDLE;
1369
1370 switch (sdata->vif.type) {
1371 case NL80211_IFTYPE_STATION:
1372 changed |= BSS_CHANGED_ASSOC |
1373 BSS_CHANGED_ARP_FILTER |
1374 BSS_CHANGED_PS;
1375 mutex_lock(&sdata->u.mgd.mtx);
1376 ieee80211_bss_info_change_notify(sdata, changed);
1377 mutex_unlock(&sdata->u.mgd.mtx);
1378 break;
1379 case NL80211_IFTYPE_ADHOC:
1380 changed |= BSS_CHANGED_IBSS;
1381 /* fall through */
1382 case NL80211_IFTYPE_AP:
1383 changed |= BSS_CHANGED_SSID;
1384
1385 if (sdata->vif.type == NL80211_IFTYPE_AP)
1386 changed |= BSS_CHANGED_AP_PROBE_RESP;
1387
1388 /* fall through */
1389 case NL80211_IFTYPE_MESH_POINT:
1390 changed |= BSS_CHANGED_BEACON |
1391 BSS_CHANGED_BEACON_ENABLED;
1392 ieee80211_bss_info_change_notify(sdata, changed);
1393 break;
1394 case NL80211_IFTYPE_WDS:
1395 break;
1396 case NL80211_IFTYPE_AP_VLAN:
1397 case NL80211_IFTYPE_MONITOR:
1398 /* ignore virtual */
1399 break;
1400 case NL80211_IFTYPE_P2P_DEVICE:
1401 changed = BSS_CHANGED_IDLE;
1402 break;
1403 case NL80211_IFTYPE_UNSPECIFIED:
1404 case NUM_NL80211_IFTYPES:
1405 case NL80211_IFTYPE_P2P_CLIENT:
1406 case NL80211_IFTYPE_P2P_GO:
1407 WARN_ON(1);
1408 break;
1409 }
1410 }
1411
1412 ieee80211_recalc_ps(local, -1);
1413
1414 /*
1415 * The sta might be in psm against the ap (e.g. because
1416 * this was the state before a hw restart), so we
1417 * explicitly send a null packet in order to make sure
1418 * it'll sync against the ap (and get out of psm).
1419 */
1420 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1421 list_for_each_entry(sdata, &local->interfaces, list) {
1422 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1423 continue;
1424
1425 ieee80211_send_nullfunc(local, sdata, 0);
1426 }
1427 }
1428
1429 /* APs are now beaconing, add back stations */
1430 mutex_lock(&local->sta_mtx);
1431 list_for_each_entry(sta, &local->sta_list, list) {
1432 enum ieee80211_sta_state state;
1433
1434 if (!sta->uploaded)
1435 continue;
1436
1437 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1438 continue;
1439
1440 for (state = IEEE80211_STA_NOTEXIST;
1441 state < sta->sta_state; state++)
1442 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1443 state + 1));
1444 }
1445 mutex_unlock(&local->sta_mtx);
1446
1447 /* add back keys */
1448 list_for_each_entry(sdata, &local->interfaces, list)
1449 if (ieee80211_sdata_running(sdata))
1450 ieee80211_enable_keys(sdata);
1451
1452 wake_up:
1453 local->in_reconfig = false;
1454 barrier();
1455
1456 /*
1457 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1458 * sessions can be established after a resume.
1459 *
1460 * Also tear down aggregation sessions since reconfiguring
1461 * them in a hardware restart scenario is not easily done
1462 * right now, and the hardware will have lost information
1463 * about the sessions, but we and the AP still think they
1464 * are active. This is really a workaround though.
1465 */
1466 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1467 mutex_lock(&local->sta_mtx);
1468
1469 list_for_each_entry(sta, &local->sta_list, list) {
1470 ieee80211_sta_tear_down_BA_sessions(sta, true);
1471 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1472 }
1473
1474 mutex_unlock(&local->sta_mtx);
1475 }
1476
1477 ieee80211_wake_queues_by_reason(hw,
1478 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1479
1480 /*
1481 * If this is for hw restart things are still running.
1482 * We may want to change that later, however.
1483 */
1484 if (!local->suspended)
1485 return 0;
1486
1487 #ifdef CONFIG_PM
1488 /* first set suspended false, then resuming */
1489 local->suspended = false;
1490 mb();
1491 local->resuming = false;
1492
1493 list_for_each_entry(sdata, &local->interfaces, list) {
1494 switch(sdata->vif.type) {
1495 case NL80211_IFTYPE_STATION:
1496 ieee80211_sta_restart(sdata);
1497 break;
1498 case NL80211_IFTYPE_ADHOC:
1499 ieee80211_ibss_restart(sdata);
1500 break;
1501 case NL80211_IFTYPE_MESH_POINT:
1502 ieee80211_mesh_restart(sdata);
1503 break;
1504 default:
1505 break;
1506 }
1507 }
1508
1509 mod_timer(&local->sta_cleanup, jiffies + 1);
1510
1511 mutex_lock(&local->sta_mtx);
1512 list_for_each_entry(sta, &local->sta_list, list)
1513 mesh_plink_restart(sta);
1514 mutex_unlock(&local->sta_mtx);
1515 #else
1516 WARN_ON(1);
1517 #endif
1518 return 0;
1519 }
1520
1521 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1522 {
1523 struct ieee80211_sub_if_data *sdata;
1524 struct ieee80211_local *local;
1525 struct ieee80211_key *key;
1526
1527 if (WARN_ON(!vif))
1528 return;
1529
1530 sdata = vif_to_sdata(vif);
1531 local = sdata->local;
1532
1533 if (WARN_ON(!local->resuming))
1534 return;
1535
1536 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1537 return;
1538
1539 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1540
1541 mutex_lock(&local->key_mtx);
1542 list_for_each_entry(key, &sdata->key_list, list)
1543 key->flags |= KEY_FLAG_TAINTED;
1544 mutex_unlock(&local->key_mtx);
1545 }
1546 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1547
1548 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1549 enum ieee80211_smps_mode *smps_mode)
1550 {
1551 if (ifmgd->associated) {
1552 *smps_mode = ifmgd->ap_smps;
1553
1554 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1555 if (ifmgd->powersave)
1556 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1557 else
1558 *smps_mode = IEEE80211_SMPS_OFF;
1559 }
1560
1561 return 1;
1562 }
1563
1564 return 0;
1565 }
1566
1567 /* must hold iflist_mtx */
1568 void ieee80211_recalc_smps(struct ieee80211_local *local)
1569 {
1570 struct ieee80211_sub_if_data *sdata;
1571 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1572 int count = 0;
1573
1574 lockdep_assert_held(&local->iflist_mtx);
1575
1576 /*
1577 * This function could be improved to handle multiple
1578 * interfaces better, but right now it makes any
1579 * non-station interfaces force SM PS to be turned
1580 * off. If there are multiple station interfaces it
1581 * could also use the best possible mode, e.g. if
1582 * one is in static and the other in dynamic then
1583 * dynamic is ok.
1584 */
1585
1586 list_for_each_entry(sdata, &local->interfaces, list) {
1587 if (!ieee80211_sdata_running(sdata))
1588 continue;
1589 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
1590 continue;
1591 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1592 goto set;
1593
1594 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1595
1596 if (count > 1) {
1597 smps_mode = IEEE80211_SMPS_OFF;
1598 break;
1599 }
1600 }
1601
1602 if (smps_mode == local->smps_mode)
1603 return;
1604
1605 set:
1606 local->smps_mode = smps_mode;
1607 /* changed flag is auto-detected for this */
1608 ieee80211_hw_config(local, 0);
1609 }
1610
1611 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1612 {
1613 int i;
1614
1615 for (i = 0; i < n_ids; i++)
1616 if (ids[i] == id)
1617 return true;
1618 return false;
1619 }
1620
1621 /**
1622 * ieee80211_ie_split - split an IE buffer according to ordering
1623 *
1624 * @ies: the IE buffer
1625 * @ielen: the length of the IE buffer
1626 * @ids: an array with element IDs that are allowed before
1627 * the split
1628 * @n_ids: the size of the element ID array
1629 * @offset: offset where to start splitting in the buffer
1630 *
1631 * This function splits an IE buffer by updating the @offset
1632 * variable to point to the location where the buffer should be
1633 * split.
1634 *
1635 * It assumes that the given IE buffer is well-formed, this
1636 * has to be guaranteed by the caller!
1637 *
1638 * It also assumes that the IEs in the buffer are ordered
1639 * correctly, if not the result of using this function will not
1640 * be ordered correctly either, i.e. it does no reordering.
1641 *
1642 * The function returns the offset where the next part of the
1643 * buffer starts, which may be @ielen if the entire (remainder)
1644 * of the buffer should be used.
1645 */
1646 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1647 const u8 *ids, int n_ids, size_t offset)
1648 {
1649 size_t pos = offset;
1650
1651 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1652 pos += 2 + ies[pos + 1];
1653
1654 return pos;
1655 }
1656
1657 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1658 {
1659 size_t pos = offset;
1660
1661 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1662 pos += 2 + ies[pos + 1];
1663
1664 return pos;
1665 }
1666
1667 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1668 int rssi_min_thold,
1669 int rssi_max_thold)
1670 {
1671 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1672
1673 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1674 return;
1675
1676 /*
1677 * Scale up threshold values before storing it, as the RSSI averaging
1678 * algorithm uses a scaled up value as well. Change this scaling
1679 * factor if the RSSI averaging algorithm changes.
1680 */
1681 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1682 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1683 }
1684
1685 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1686 int rssi_min_thold,
1687 int rssi_max_thold)
1688 {
1689 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1690
1691 WARN_ON(rssi_min_thold == rssi_max_thold ||
1692 rssi_min_thold > rssi_max_thold);
1693
1694 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1695 rssi_max_thold);
1696 }
1697 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1698
1699 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1700 {
1701 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1702
1703 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1704 }
1705 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1706
1707 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1708 u16 cap)
1709 {
1710 __le16 tmp;
1711
1712 *pos++ = WLAN_EID_HT_CAPABILITY;
1713 *pos++ = sizeof(struct ieee80211_ht_cap);
1714 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1715
1716 /* capability flags */
1717 tmp = cpu_to_le16(cap);
1718 memcpy(pos, &tmp, sizeof(u16));
1719 pos += sizeof(u16);
1720
1721 /* AMPDU parameters */
1722 *pos++ = ht_cap->ampdu_factor |
1723 (ht_cap->ampdu_density <<
1724 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1725
1726 /* MCS set */
1727 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1728 pos += sizeof(ht_cap->mcs);
1729
1730 /* extended capabilities */
1731 pos += sizeof(__le16);
1732
1733 /* BF capabilities */
1734 pos += sizeof(__le32);
1735
1736 /* antenna selection */
1737 pos += sizeof(u8);
1738
1739 return pos;
1740 }
1741
1742 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1743 u32 cap)
1744 {
1745 __le32 tmp;
1746
1747 *pos++ = WLAN_EID_VHT_CAPABILITY;
1748 *pos++ = sizeof(struct ieee80211_vht_capabilities);
1749 memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1750
1751 /* capability flags */
1752 tmp = cpu_to_le32(cap);
1753 memcpy(pos, &tmp, sizeof(u32));
1754 pos += sizeof(u32);
1755
1756 /* VHT MCS set */
1757 memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1758 pos += sizeof(vht_cap->vht_mcs);
1759
1760 return pos;
1761 }
1762
1763 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1764 struct ieee80211_channel *channel,
1765 enum nl80211_channel_type channel_type,
1766 u16 prot_mode)
1767 {
1768 struct ieee80211_ht_operation *ht_oper;
1769 /* Build HT Information */
1770 *pos++ = WLAN_EID_HT_OPERATION;
1771 *pos++ = sizeof(struct ieee80211_ht_operation);
1772 ht_oper = (struct ieee80211_ht_operation *)pos;
1773 ht_oper->primary_chan =
1774 ieee80211_frequency_to_channel(channel->center_freq);
1775 switch (channel_type) {
1776 case NL80211_CHAN_HT40MINUS:
1777 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1778 break;
1779 case NL80211_CHAN_HT40PLUS:
1780 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1781 break;
1782 case NL80211_CHAN_HT20:
1783 default:
1784 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1785 break;
1786 }
1787 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1788 channel_type != NL80211_CHAN_NO_HT &&
1789 channel_type != NL80211_CHAN_HT20)
1790 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1791
1792 ht_oper->operation_mode = cpu_to_le16(prot_mode);
1793 ht_oper->stbc_param = 0x0000;
1794
1795 /* It seems that Basic MCS set and Supported MCS set
1796 are identical for the first 10 bytes */
1797 memset(&ht_oper->basic_set, 0, 16);
1798 memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1799
1800 return pos + sizeof(struct ieee80211_ht_operation);
1801 }
1802
1803 enum nl80211_channel_type
1804 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1805 {
1806 enum nl80211_channel_type channel_type;
1807
1808 if (!ht_oper)
1809 return NL80211_CHAN_NO_HT;
1810
1811 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1812 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1813 channel_type = NL80211_CHAN_HT20;
1814 break;
1815 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1816 channel_type = NL80211_CHAN_HT40PLUS;
1817 break;
1818 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1819 channel_type = NL80211_CHAN_HT40MINUS;
1820 break;
1821 default:
1822 channel_type = NL80211_CHAN_NO_HT;
1823 }
1824
1825 return channel_type;
1826 }
1827
1828 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1829 struct sk_buff *skb, bool need_basic,
1830 enum ieee80211_band band)
1831 {
1832 struct ieee80211_local *local = sdata->local;
1833 struct ieee80211_supported_band *sband;
1834 int rate;
1835 u8 i, rates, *pos;
1836 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1837
1838 sband = local->hw.wiphy->bands[band];
1839 rates = sband->n_bitrates;
1840 if (rates > 8)
1841 rates = 8;
1842
1843 if (skb_tailroom(skb) < rates + 2)
1844 return -ENOMEM;
1845
1846 pos = skb_put(skb, rates + 2);
1847 *pos++ = WLAN_EID_SUPP_RATES;
1848 *pos++ = rates;
1849 for (i = 0; i < rates; i++) {
1850 u8 basic = 0;
1851 if (need_basic && basic_rates & BIT(i))
1852 basic = 0x80;
1853 rate = sband->bitrates[i].bitrate;
1854 *pos++ = basic | (u8) (rate / 5);
1855 }
1856
1857 return 0;
1858 }
1859
1860 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1861 struct sk_buff *skb, bool need_basic,
1862 enum ieee80211_band band)
1863 {
1864 struct ieee80211_local *local = sdata->local;
1865 struct ieee80211_supported_band *sband;
1866 int rate;
1867 u8 i, exrates, *pos;
1868 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1869
1870 sband = local->hw.wiphy->bands[band];
1871 exrates = sband->n_bitrates;
1872 if (exrates > 8)
1873 exrates -= 8;
1874 else
1875 exrates = 0;
1876
1877 if (skb_tailroom(skb) < exrates + 2)
1878 return -ENOMEM;
1879
1880 if (exrates) {
1881 pos = skb_put(skb, exrates + 2);
1882 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1883 *pos++ = exrates;
1884 for (i = 8; i < sband->n_bitrates; i++) {
1885 u8 basic = 0;
1886 if (need_basic && basic_rates & BIT(i))
1887 basic = 0x80;
1888 rate = sband->bitrates[i].bitrate;
1889 *pos++ = basic | (u8) (rate / 5);
1890 }
1891 }
1892 return 0;
1893 }
1894
1895 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1896 {
1897 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1898 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1899
1900 if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1901 /* non-managed type inferfaces */
1902 return 0;
1903 }
1904 return ifmgd->ave_beacon_signal;
1905 }
1906 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
Linux kernel - Deliverables
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