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
wiphy_to_ieee80211_hw(struct wiphy * wiphy)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
ieee80211_get_bssid(struct ieee80211_hdr * hdr,size_t len,enum nl80211_iftype type)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
ieee80211_tx_set_protected(struct ieee80211_tx_data * tx)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
ieee80211_frame_duration(struct ieee80211_local * local,size_t len,int rate,int erp,int short_preamble)109 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
110 int rate, int erp, int short_preamble)
111 {
112 int dur;
113
114 /* calculate duration (in microseconds, rounded up to next higher
115 * integer if it includes a fractional microsecond) to send frame of
116 * len bytes (does not include FCS) at the given rate. Duration will
117 * also include SIFS.
118 *
119 * rate is in 100 kbps, so divident is multiplied by 10 in the
120 * DIV_ROUND_UP() operations.
121 */
122
123 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
124 /*
125 * OFDM:
126 *
127 * N_DBPS = DATARATE x 4
128 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
129 * (16 = SIGNAL time, 6 = tail bits)
130 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
131 *
132 * T_SYM = 4 usec
133 * 802.11a - 17.5.2: aSIFSTime = 16 usec
134 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
135 * signal ext = 6 usec
136 */
137 dur = 16; /* SIFS + signal ext */
138 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
139 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
140 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
141 4 * rate); /* T_SYM x N_SYM */
142 } else {
143 /*
144 * 802.11b or 802.11g with 802.11b compatibility:
145 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
146 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
147 *
148 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
149 * aSIFSTime = 10 usec
150 * aPreambleLength = 144 usec or 72 usec with short preamble
151 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
152 */
153 dur = 10; /* aSIFSTime = 10 usec */
154 dur += short_preamble ? (72 + 24) : (144 + 48);
155
156 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
157 }
158
159 return dur;
160 }
161
162 /* Exported duration function for driver use */
ieee80211_generic_frame_duration(struct ieee80211_hw * hw,struct ieee80211_vif * vif,size_t frame_len,struct ieee80211_rate * rate)163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
164 struct ieee80211_vif *vif,
165 size_t frame_len,
166 struct ieee80211_rate *rate)
167 {
168 struct ieee80211_local *local = hw_to_local(hw);
169 struct ieee80211_sub_if_data *sdata;
170 u16 dur;
171 int erp;
172 bool short_preamble = false;
173
174 erp = 0;
175 if (vif) {
176 sdata = vif_to_sdata(vif);
177 short_preamble = sdata->vif.bss_conf.use_short_preamble;
178 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
179 erp = rate->flags & IEEE80211_RATE_ERP_G;
180 }
181
182 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
183 short_preamble);
184
185 return cpu_to_le16(dur);
186 }
187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
188
ieee80211_rts_duration(struct ieee80211_hw * hw,struct ieee80211_vif * vif,size_t frame_len,const struct ieee80211_tx_info * frame_txctl)189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
190 struct ieee80211_vif *vif, size_t frame_len,
191 const struct ieee80211_tx_info *frame_txctl)
192 {
193 struct ieee80211_local *local = hw_to_local(hw);
194 struct ieee80211_rate *rate;
195 struct ieee80211_sub_if_data *sdata;
196 bool short_preamble;
197 int erp;
198 u16 dur;
199 struct ieee80211_supported_band *sband;
200
201 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
202
203 short_preamble = false;
204
205 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
206
207 erp = 0;
208 if (vif) {
209 sdata = vif_to_sdata(vif);
210 short_preamble = sdata->vif.bss_conf.use_short_preamble;
211 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
212 erp = rate->flags & IEEE80211_RATE_ERP_G;
213 }
214
215 /* CTS duration */
216 dur = ieee80211_frame_duration(local, 10, rate->bitrate,
217 erp, short_preamble);
218 /* Data frame duration */
219 dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
220 erp, short_preamble);
221 /* ACK duration */
222 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
223 erp, short_preamble);
224
225 return cpu_to_le16(dur);
226 }
227 EXPORT_SYMBOL(ieee80211_rts_duration);
228
ieee80211_ctstoself_duration(struct ieee80211_hw * hw,struct ieee80211_vif * vif,size_t frame_len,const struct ieee80211_tx_info * frame_txctl)229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
230 struct ieee80211_vif *vif,
231 size_t frame_len,
232 const struct ieee80211_tx_info *frame_txctl)
233 {
234 struct ieee80211_local *local = hw_to_local(hw);
235 struct ieee80211_rate *rate;
236 struct ieee80211_sub_if_data *sdata;
237 bool short_preamble;
238 int erp;
239 u16 dur;
240 struct ieee80211_supported_band *sband;
241
242 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
243
244 short_preamble = false;
245
246 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
247 erp = 0;
248 if (vif) {
249 sdata = vif_to_sdata(vif);
250 short_preamble = sdata->vif.bss_conf.use_short_preamble;
251 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
252 erp = rate->flags & IEEE80211_RATE_ERP_G;
253 }
254
255 /* Data frame duration */
256 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
257 erp, short_preamble);
258 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
259 /* ACK duration */
260 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
261 erp, short_preamble);
262 }
263
264 return cpu_to_le16(dur);
265 }
266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
267
__ieee80211_wake_queue(struct ieee80211_hw * hw,int queue,enum queue_stop_reason reason)268 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
269 enum queue_stop_reason reason)
270 {
271 struct ieee80211_local *local = hw_to_local(hw);
272 struct ieee80211_sub_if_data *sdata;
273
274 trace_wake_queue(local, queue, reason);
275
276 if (WARN_ON(queue >= hw->queues))
277 return;
278
279 __clear_bit(reason, &local->queue_stop_reasons[queue]);
280
281 if (local->queue_stop_reasons[queue] != 0)
282 /* someone still has this queue stopped */
283 return;
284
285 if (skb_queue_empty(&local->pending[queue])) {
286 rcu_read_lock();
287 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
288 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
289 continue;
290 netif_wake_subqueue(sdata->dev, queue);
291 }
292 rcu_read_unlock();
293 } else
294 tasklet_schedule(&local->tx_pending_tasklet);
295 }
296
ieee80211_wake_queue_by_reason(struct ieee80211_hw * hw,int queue,enum queue_stop_reason reason)297 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
298 enum queue_stop_reason reason)
299 {
300 struct ieee80211_local *local = hw_to_local(hw);
301 unsigned long flags;
302
303 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
304 __ieee80211_wake_queue(hw, queue, reason);
305 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
306 }
307
ieee80211_wake_queue(struct ieee80211_hw * hw,int queue)308 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
309 {
310 ieee80211_wake_queue_by_reason(hw, queue,
311 IEEE80211_QUEUE_STOP_REASON_DRIVER);
312 }
313 EXPORT_SYMBOL(ieee80211_wake_queue);
314
__ieee80211_stop_queue(struct ieee80211_hw * hw,int queue,enum queue_stop_reason reason)315 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
316 enum queue_stop_reason reason)
317 {
318 struct ieee80211_local *local = hw_to_local(hw);
319 struct ieee80211_sub_if_data *sdata;
320
321 trace_stop_queue(local, queue, reason);
322
323 if (WARN_ON(queue >= hw->queues))
324 return;
325
326 __set_bit(reason, &local->queue_stop_reasons[queue]);
327
328 rcu_read_lock();
329 list_for_each_entry_rcu(sdata, &local->interfaces, list)
330 netif_stop_subqueue(sdata->dev, queue);
331 rcu_read_unlock();
332 }
333
ieee80211_stop_queue_by_reason(struct ieee80211_hw * hw,int queue,enum queue_stop_reason reason)334 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
335 enum queue_stop_reason reason)
336 {
337 struct ieee80211_local *local = hw_to_local(hw);
338 unsigned long flags;
339
340 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
341 __ieee80211_stop_queue(hw, queue, reason);
342 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
343 }
344
ieee80211_stop_queue(struct ieee80211_hw * hw,int queue)345 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
346 {
347 ieee80211_stop_queue_by_reason(hw, queue,
348 IEEE80211_QUEUE_STOP_REASON_DRIVER);
349 }
350 EXPORT_SYMBOL(ieee80211_stop_queue);
351
ieee80211_add_pending_skb(struct ieee80211_local * local,struct sk_buff * skb)352 void ieee80211_add_pending_skb(struct ieee80211_local *local,
353 struct sk_buff *skb)
354 {
355 struct ieee80211_hw *hw = &local->hw;
356 unsigned long flags;
357 int queue = skb_get_queue_mapping(skb);
358 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
359
360 if (WARN_ON(!info->control.vif)) {
361 kfree_skb(skb);
362 return;
363 }
364
365 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
366 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
367 __skb_queue_tail(&local->pending[queue], skb);
368 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
369 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
370 }
371
ieee80211_add_pending_skbs_fn(struct ieee80211_local * local,struct sk_buff_head * skbs,void (* fn)(void * data),void * data)372 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
373 struct sk_buff_head *skbs,
374 void (*fn)(void *data), void *data)
375 {
376 struct ieee80211_hw *hw = &local->hw;
377 struct sk_buff *skb;
378 unsigned long flags;
379 int queue, i;
380
381 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
382 for (i = 0; i < hw->queues; i++)
383 __ieee80211_stop_queue(hw, i,
384 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
385
386 while ((skb = skb_dequeue(skbs))) {
387 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
388
389 if (WARN_ON(!info->control.vif)) {
390 kfree_skb(skb);
391 continue;
392 }
393
394 queue = skb_get_queue_mapping(skb);
395 __skb_queue_tail(&local->pending[queue], skb);
396 }
397
398 if (fn)
399 fn(data);
400
401 for (i = 0; i < hw->queues; i++)
402 __ieee80211_wake_queue(hw, i,
403 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
404 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
405 }
406
ieee80211_add_pending_skbs(struct ieee80211_local * local,struct sk_buff_head * skbs)407 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
408 struct sk_buff_head *skbs)
409 {
410 ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
411 }
412
ieee80211_stop_queues_by_reason(struct ieee80211_hw * hw,enum queue_stop_reason reason)413 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
414 enum queue_stop_reason reason)
415 {
416 struct ieee80211_local *local = hw_to_local(hw);
417 unsigned long flags;
418 int i;
419
420 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
421
422 for (i = 0; i < hw->queues; i++)
423 __ieee80211_stop_queue(hw, i, reason);
424
425 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
426 }
427
ieee80211_stop_queues(struct ieee80211_hw * hw)428 void ieee80211_stop_queues(struct ieee80211_hw *hw)
429 {
430 ieee80211_stop_queues_by_reason(hw,
431 IEEE80211_QUEUE_STOP_REASON_DRIVER);
432 }
433 EXPORT_SYMBOL(ieee80211_stop_queues);
434
ieee80211_queue_stopped(struct ieee80211_hw * hw,int queue)435 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
436 {
437 struct ieee80211_local *local = hw_to_local(hw);
438 unsigned long flags;
439 int ret;
440
441 if (WARN_ON(queue >= hw->queues))
442 return true;
443
444 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
445 ret = !!local->queue_stop_reasons[queue];
446 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
447 return ret;
448 }
449 EXPORT_SYMBOL(ieee80211_queue_stopped);
450
ieee80211_wake_queues_by_reason(struct ieee80211_hw * hw,enum queue_stop_reason reason)451 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
452 enum queue_stop_reason reason)
453 {
454 struct ieee80211_local *local = hw_to_local(hw);
455 unsigned long flags;
456 int i;
457
458 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
459
460 for (i = 0; i < hw->queues; i++)
461 __ieee80211_wake_queue(hw, i, reason);
462
463 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
464 }
465
ieee80211_wake_queues(struct ieee80211_hw * hw)466 void ieee80211_wake_queues(struct ieee80211_hw *hw)
467 {
468 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
469 }
470 EXPORT_SYMBOL(ieee80211_wake_queues);
471
ieee80211_iterate_active_interfaces(struct ieee80211_hw * hw,void (* iterator)(void * data,u8 * mac,struct ieee80211_vif * vif),void * data)472 void ieee80211_iterate_active_interfaces(
473 struct ieee80211_hw *hw,
474 void (*iterator)(void *data, u8 *mac,
475 struct ieee80211_vif *vif),
476 void *data)
477 {
478 struct ieee80211_local *local = hw_to_local(hw);
479 struct ieee80211_sub_if_data *sdata;
480
481 mutex_lock(&local->iflist_mtx);
482
483 list_for_each_entry(sdata, &local->interfaces, list) {
484 switch (sdata->vif.type) {
485 case NL80211_IFTYPE_MONITOR:
486 case NL80211_IFTYPE_AP_VLAN:
487 continue;
488 default:
489 break;
490 }
491 if (ieee80211_sdata_running(sdata))
492 iterator(data, sdata->vif.addr,
493 &sdata->vif);
494 }
495
496 mutex_unlock(&local->iflist_mtx);
497 }
498 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
499
ieee80211_iterate_active_interfaces_atomic(struct ieee80211_hw * hw,void (* iterator)(void * data,u8 * mac,struct ieee80211_vif * vif),void * data)500 void ieee80211_iterate_active_interfaces_atomic(
501 struct ieee80211_hw *hw,
502 void (*iterator)(void *data, u8 *mac,
503 struct ieee80211_vif *vif),
504 void *data)
505 {
506 struct ieee80211_local *local = hw_to_local(hw);
507 struct ieee80211_sub_if_data *sdata;
508
509 rcu_read_lock();
510
511 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
512 switch (sdata->vif.type) {
513 case NL80211_IFTYPE_MONITOR:
514 case NL80211_IFTYPE_AP_VLAN:
515 continue;
516 default:
517 break;
518 }
519 if (ieee80211_sdata_running(sdata))
520 iterator(data, sdata->vif.addr,
521 &sdata->vif);
522 }
523
524 rcu_read_unlock();
525 }
526 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
527
528 /*
529 * Nothing should have been stuffed into the workqueue during
530 * the suspend->resume cycle. If this WARN is seen then there
531 * is a bug with either the driver suspend or something in
532 * mac80211 stuffing into the workqueue which we haven't yet
533 * cleared during mac80211's suspend cycle.
534 */
ieee80211_can_queue_work(struct ieee80211_local * local)535 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
536 {
537 if (WARN(local->suspended && !local->resuming,
538 "queueing ieee80211 work while going to suspend\n"))
539 return false;
540
541 return true;
542 }
543
ieee80211_queue_work(struct ieee80211_hw * hw,struct work_struct * work)544 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
545 {
546 struct ieee80211_local *local = hw_to_local(hw);
547
548 if (!ieee80211_can_queue_work(local))
549 return;
550
551 queue_work(local->workqueue, work);
552 }
553 EXPORT_SYMBOL(ieee80211_queue_work);
554
ieee80211_queue_delayed_work(struct ieee80211_hw * hw,struct delayed_work * dwork,unsigned long delay)555 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
556 struct delayed_work *dwork,
557 unsigned long delay)
558 {
559 struct ieee80211_local *local = hw_to_local(hw);
560
561 if (!ieee80211_can_queue_work(local))
562 return;
563
564 queue_delayed_work(local->workqueue, dwork, delay);
565 }
566 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
567
ieee802_11_parse_elems_crc(u8 * start,size_t len,struct ieee802_11_elems * elems,u64 filter,u32 crc)568 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
569 struct ieee802_11_elems *elems,
570 u64 filter, u32 crc)
571 {
572 size_t left = len;
573 u8 *pos = start;
574 bool calc_crc = filter != 0;
575 DECLARE_BITMAP(seen_elems, 256);
576
577 bitmap_zero(seen_elems, 256);
578 memset(elems, 0, sizeof(*elems));
579 elems->ie_start = start;
580 elems->total_len = len;
581
582 while (left >= 2) {
583 u8 id, elen;
584 bool elem_parse_failed;
585
586 id = *pos++;
587 elen = *pos++;
588 left -= 2;
589
590 if (elen > left) {
591 elems->parse_error = true;
592 break;
593 }
594
595 switch (id) {
596 case WLAN_EID_SSID:
597 case WLAN_EID_SUPP_RATES:
598 case WLAN_EID_FH_PARAMS:
599 case WLAN_EID_DS_PARAMS:
600 case WLAN_EID_CF_PARAMS:
601 case WLAN_EID_TIM:
602 case WLAN_EID_IBSS_PARAMS:
603 case WLAN_EID_CHALLENGE:
604 case WLAN_EID_RSN:
605 case WLAN_EID_ERP_INFO:
606 case WLAN_EID_EXT_SUPP_RATES:
607 case WLAN_EID_HT_CAPABILITY:
608 case WLAN_EID_MESH_ID:
609 case WLAN_EID_MESH_CONFIG:
610 case WLAN_EID_PEER_MGMT:
611 case WLAN_EID_PREQ:
612 case WLAN_EID_PREP:
613 case WLAN_EID_PERR:
614 case WLAN_EID_RANN:
615 case WLAN_EID_CHANNEL_SWITCH:
616 case WLAN_EID_EXT_CHANSWITCH_ANN:
617 case WLAN_EID_COUNTRY:
618 case WLAN_EID_PWR_CONSTRAINT:
619 case WLAN_EID_TIMEOUT_INTERVAL:
620 if (test_bit(id, seen_elems)) {
621 elems->parse_error = true;
622 left -= elen;
623 pos += elen;
624 continue;
625 }
626 break;
627 }
628
629 if (calc_crc && id < 64 && (filter & (1ULL << id)))
630 crc = crc32_be(crc, pos - 2, elen + 2);
631
632 elem_parse_failed = false;
633
634 switch (id) {
635 case WLAN_EID_SSID:
636 elems->ssid = pos;
637 elems->ssid_len = elen;
638 break;
639 case WLAN_EID_SUPP_RATES:
640 elems->supp_rates = pos;
641 elems->supp_rates_len = elen;
642 break;
643 case WLAN_EID_FH_PARAMS:
644 elems->fh_params = pos;
645 elems->fh_params_len = elen;
646 break;
647 case WLAN_EID_DS_PARAMS:
648 elems->ds_params = pos;
649 elems->ds_params_len = elen;
650 break;
651 case WLAN_EID_CF_PARAMS:
652 elems->cf_params = pos;
653 elems->cf_params_len = elen;
654 break;
655 case WLAN_EID_TIM:
656 if (elen >= sizeof(struct ieee80211_tim_ie)) {
657 elems->tim = (void *)pos;
658 elems->tim_len = elen;
659 } else
660 elem_parse_failed = true;
661 break;
662 case WLAN_EID_IBSS_PARAMS:
663 elems->ibss_params = pos;
664 elems->ibss_params_len = elen;
665 break;
666 case WLAN_EID_CHALLENGE:
667 elems->challenge = pos;
668 elems->challenge_len = elen;
669 break;
670 case WLAN_EID_VENDOR_SPECIFIC:
671 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
672 pos[2] == 0xf2) {
673 /* Microsoft OUI (00:50:F2) */
674
675 if (calc_crc)
676 crc = crc32_be(crc, pos - 2, elen + 2);
677
678 if (pos[3] == 1) {
679 /* OUI Type 1 - WPA IE */
680 elems->wpa = pos;
681 elems->wpa_len = elen;
682 } else if (elen >= 5 && pos[3] == 2) {
683 /* OUI Type 2 - WMM IE */
684 if (pos[4] == 0) {
685 elems->wmm_info = pos;
686 elems->wmm_info_len = elen;
687 } else if (pos[4] == 1) {
688 elems->wmm_param = pos;
689 elems->wmm_param_len = elen;
690 }
691 }
692 }
693 break;
694 case WLAN_EID_RSN:
695 elems->rsn = pos;
696 elems->rsn_len = elen;
697 break;
698 case WLAN_EID_ERP_INFO:
699 elems->erp_info = pos;
700 elems->erp_info_len = elen;
701 break;
702 case WLAN_EID_EXT_SUPP_RATES:
703 elems->ext_supp_rates = pos;
704 elems->ext_supp_rates_len = elen;
705 break;
706 case WLAN_EID_HT_CAPABILITY:
707 if (elen >= sizeof(struct ieee80211_ht_cap))
708 elems->ht_cap_elem = (void *)pos;
709 else
710 elem_parse_failed = true;
711 break;
712 case WLAN_EID_HT_INFORMATION:
713 if (elen >= sizeof(struct ieee80211_ht_info))
714 elems->ht_info_elem = (void *)pos;
715 else
716 elem_parse_failed = true;
717 break;
718 case WLAN_EID_MESH_ID:
719 elems->mesh_id = pos;
720 elems->mesh_id_len = elen;
721 break;
722 case WLAN_EID_MESH_CONFIG:
723 if (elen >= sizeof(struct ieee80211_meshconf_ie))
724 elems->mesh_config = (void *)pos;
725 else
726 elem_parse_failed = true;
727 break;
728 case WLAN_EID_PEER_MGMT:
729 elems->peering = pos;
730 elems->peering_len = elen;
731 break;
732 case WLAN_EID_PREQ:
733 elems->preq = pos;
734 elems->preq_len = elen;
735 break;
736 case WLAN_EID_PREP:
737 elems->prep = pos;
738 elems->prep_len = elen;
739 break;
740 case WLAN_EID_PERR:
741 elems->perr = pos;
742 elems->perr_len = elen;
743 break;
744 case WLAN_EID_RANN:
745 if (elen >= sizeof(struct ieee80211_rann_ie))
746 elems->rann = (void *)pos;
747 else
748 elem_parse_failed = true;
749 break;
750 case WLAN_EID_CHANNEL_SWITCH:
751 elems->ch_switch_elem = pos;
752 elems->ch_switch_elem_len = elen;
753 break;
754 case WLAN_EID_QUIET:
755 if (!elems->quiet_elem) {
756 elems->quiet_elem = pos;
757 elems->quiet_elem_len = elen;
758 }
759 elems->num_of_quiet_elem++;
760 break;
761 case WLAN_EID_COUNTRY:
762 elems->country_elem = pos;
763 elems->country_elem_len = elen;
764 break;
765 case WLAN_EID_PWR_CONSTRAINT:
766 elems->pwr_constr_elem = pos;
767 elems->pwr_constr_elem_len = elen;
768 break;
769 case WLAN_EID_TIMEOUT_INTERVAL:
770 elems->timeout_int = pos;
771 elems->timeout_int_len = elen;
772 break;
773 default:
774 break;
775 }
776
777 if (elem_parse_failed)
778 elems->parse_error = true;
779 else
780 set_bit(id, seen_elems);
781
782 left -= elen;
783 pos += elen;
784 }
785
786 if (left != 0)
787 elems->parse_error = true;
788
789 return crc;
790 }
791
ieee802_11_parse_elems(u8 * start,size_t len,struct ieee802_11_elems * elems)792 void ieee802_11_parse_elems(u8 *start, size_t len,
793 struct ieee802_11_elems *elems)
794 {
795 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
796 }
797
ieee80211_set_wmm_default(struct ieee80211_sub_if_data * sdata,bool bss_notify)798 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
799 bool bss_notify)
800 {
801 struct ieee80211_local *local = sdata->local;
802 struct ieee80211_tx_queue_params qparam;
803 int queue;
804 bool use_11b;
805 int aCWmin, aCWmax;
806
807 if (!local->ops->conf_tx)
808 return;
809
810 memset(&qparam, 0, sizeof(qparam));
811
812 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
813 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
814
815 for (queue = 0; queue < local->hw.queues; queue++) {
816 /* Set defaults according to 802.11-2007 Table 7-37 */
817 aCWmax = 1023;
818 if (use_11b)
819 aCWmin = 31;
820 else
821 aCWmin = 15;
822
823 switch (queue) {
824 case 3: /* AC_BK */
825 qparam.cw_max = aCWmax;
826 qparam.cw_min = aCWmin;
827 qparam.txop = 0;
828 qparam.aifs = 7;
829 break;
830 default: /* never happens but let's not leave undefined */
831 case 2: /* AC_BE */
832 qparam.cw_max = aCWmax;
833 qparam.cw_min = aCWmin;
834 qparam.txop = 0;
835 qparam.aifs = 3;
836 break;
837 case 1: /* AC_VI */
838 qparam.cw_max = aCWmin;
839 qparam.cw_min = (aCWmin + 1) / 2 - 1;
840 if (use_11b)
841 qparam.txop = 6016/32;
842 else
843 qparam.txop = 3008/32;
844 qparam.aifs = 2;
845 break;
846 case 0: /* AC_VO */
847 qparam.cw_max = (aCWmin + 1) / 2 - 1;
848 qparam.cw_min = (aCWmin + 1) / 4 - 1;
849 if (use_11b)
850 qparam.txop = 3264/32;
851 else
852 qparam.txop = 1504/32;
853 qparam.aifs = 2;
854 break;
855 }
856
857 qparam.uapsd = false;
858
859 sdata->tx_conf[queue] = qparam;
860 drv_conf_tx(local, sdata, queue, &qparam);
861 }
862
863 /* after reinitialize QoS TX queues setting to default,
864 * disable QoS at all */
865
866 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
867 sdata->vif.bss_conf.qos =
868 sdata->vif.type != NL80211_IFTYPE_STATION;
869 if (bss_notify)
870 ieee80211_bss_info_change_notify(sdata,
871 BSS_CHANGED_QOS);
872 }
873 }
874
ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data * sdata,const size_t supp_rates_len,const u8 * supp_rates)875 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
876 const size_t supp_rates_len,
877 const u8 *supp_rates)
878 {
879 struct ieee80211_local *local = sdata->local;
880 int i, have_higher_than_11mbit = 0;
881
882 /* cf. IEEE 802.11 9.2.12 */
883 for (i = 0; i < supp_rates_len; i++)
884 if ((supp_rates[i] & 0x7f) * 5 > 110)
885 have_higher_than_11mbit = 1;
886
887 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
888 have_higher_than_11mbit)
889 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
890 else
891 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
892
893 ieee80211_set_wmm_default(sdata, true);
894 }
895
ieee80211_mandatory_rates(struct ieee80211_local * local,enum ieee80211_band band)896 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
897 enum ieee80211_band band)
898 {
899 struct ieee80211_supported_band *sband;
900 struct ieee80211_rate *bitrates;
901 u32 mandatory_rates;
902 enum ieee80211_rate_flags mandatory_flag;
903 int i;
904
905 sband = local->hw.wiphy->bands[band];
906 if (!sband) {
907 WARN_ON(1);
908 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
909 }
910
911 if (band == IEEE80211_BAND_2GHZ)
912 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
913 else
914 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
915
916 bitrates = sband->bitrates;
917 mandatory_rates = 0;
918 for (i = 0; i < sband->n_bitrates; i++)
919 if (bitrates[i].flags & mandatory_flag)
920 mandatory_rates |= BIT(i);
921 return mandatory_rates;
922 }
923
ieee80211_send_auth(struct ieee80211_sub_if_data * sdata,u16 transaction,u16 auth_alg,u8 * extra,size_t extra_len,const u8 * da,const u8 * bssid,const u8 * key,u8 key_len,u8 key_idx)924 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
925 u16 transaction, u16 auth_alg,
926 u8 *extra, size_t extra_len, const u8 *da,
927 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
928 {
929 struct ieee80211_local *local = sdata->local;
930 struct sk_buff *skb;
931 struct ieee80211_mgmt *mgmt;
932 int err;
933
934 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
935 sizeof(*mgmt) + 6 + extra_len);
936 if (!skb)
937 return;
938
939 skb_reserve(skb, local->hw.extra_tx_headroom);
940
941 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
942 memset(mgmt, 0, 24 + 6);
943 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
944 IEEE80211_STYPE_AUTH);
945 memcpy(mgmt->da, da, ETH_ALEN);
946 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
947 memcpy(mgmt->bssid, bssid, ETH_ALEN);
948 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
949 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
950 mgmt->u.auth.status_code = cpu_to_le16(0);
951 if (extra)
952 memcpy(skb_put(skb, extra_len), extra, extra_len);
953
954 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
955 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
956 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
957 WARN_ON(err);
958 }
959
960 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
961 ieee80211_tx_skb(sdata, skb);
962 }
963
ieee80211_build_preq_ies(struct ieee80211_local * local,u8 * buffer,const u8 * ie,size_t ie_len,enum ieee80211_band band,u32 rate_mask,u8 channel)964 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
965 const u8 *ie, size_t ie_len,
966 enum ieee80211_band band, u32 rate_mask,
967 u8 channel)
968 {
969 struct ieee80211_supported_band *sband;
970 u8 *pos;
971 size_t offset = 0, noffset;
972 int supp_rates_len, i;
973 u8 rates[32];
974 int num_rates;
975 int ext_rates_len;
976
977 sband = local->hw.wiphy->bands[band];
978
979 pos = buffer;
980
981 num_rates = 0;
982 for (i = 0; i < sband->n_bitrates; i++) {
983 if ((BIT(i) & rate_mask) == 0)
984 continue; /* skip rate */
985 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
986 }
987
988 supp_rates_len = min_t(int, num_rates, 8);
989
990 *pos++ = WLAN_EID_SUPP_RATES;
991 *pos++ = supp_rates_len;
992 memcpy(pos, rates, supp_rates_len);
993 pos += supp_rates_len;
994
995 /* insert "request information" if in custom IEs */
996 if (ie && ie_len) {
997 static const u8 before_extrates[] = {
998 WLAN_EID_SSID,
999 WLAN_EID_SUPP_RATES,
1000 WLAN_EID_REQUEST,
1001 };
1002 noffset = ieee80211_ie_split(ie, ie_len,
1003 before_extrates,
1004 ARRAY_SIZE(before_extrates),
1005 offset);
1006 memcpy(pos, ie + offset, noffset - offset);
1007 pos += noffset - offset;
1008 offset = noffset;
1009 }
1010
1011 ext_rates_len = num_rates - supp_rates_len;
1012 if (ext_rates_len > 0) {
1013 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1014 *pos++ = ext_rates_len;
1015 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1016 pos += ext_rates_len;
1017 }
1018
1019 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1020 *pos++ = WLAN_EID_DS_PARAMS;
1021 *pos++ = 1;
1022 *pos++ = channel;
1023 }
1024
1025 /* insert custom IEs that go before HT */
1026 if (ie && ie_len) {
1027 static const u8 before_ht[] = {
1028 WLAN_EID_SSID,
1029 WLAN_EID_SUPP_RATES,
1030 WLAN_EID_REQUEST,
1031 WLAN_EID_EXT_SUPP_RATES,
1032 WLAN_EID_DS_PARAMS,
1033 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1034 };
1035 noffset = ieee80211_ie_split(ie, ie_len,
1036 before_ht, ARRAY_SIZE(before_ht),
1037 offset);
1038 memcpy(pos, ie + offset, noffset - offset);
1039 pos += noffset - offset;
1040 offset = noffset;
1041 }
1042
1043 if (sband->ht_cap.ht_supported)
1044 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1045 sband->ht_cap.cap);
1046
1047 /*
1048 * If adding more here, adjust code in main.c
1049 * that calculates local->scan_ies_len.
1050 */
1051
1052 /* add any remaining custom IEs */
1053 if (ie && ie_len) {
1054 noffset = ie_len;
1055 memcpy(pos, ie + offset, noffset - offset);
1056 pos += noffset - offset;
1057 }
1058
1059 return pos - buffer;
1060 }
1061
ieee80211_build_probe_req(struct ieee80211_sub_if_data * sdata,u8 * dst,u32 ratemask,const u8 * ssid,size_t ssid_len,const u8 * ie,size_t ie_len,bool directed)1062 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1063 u8 *dst, u32 ratemask,
1064 const u8 *ssid, size_t ssid_len,
1065 const u8 *ie, size_t ie_len,
1066 bool directed)
1067 {
1068 struct ieee80211_local *local = sdata->local;
1069 struct sk_buff *skb;
1070 struct ieee80211_mgmt *mgmt;
1071 size_t buf_len;
1072 u8 *buf;
1073 u8 chan;
1074
1075 /* FIXME: come up with a proper value */
1076 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1077 if (!buf)
1078 return NULL;
1079
1080 /*
1081 * Do not send DS Channel parameter for directed probe requests
1082 * in order to maximize the chance that we get a response. Some
1083 * badly-behaved APs don't respond when this parameter is included.
1084 */
1085 if (directed)
1086 chan = 0;
1087 else
1088 chan = ieee80211_frequency_to_channel(
1089 local->hw.conf.channel->center_freq);
1090
1091 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1092 local->hw.conf.channel->band,
1093 ratemask, chan);
1094
1095 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1096 ssid, ssid_len,
1097 buf, buf_len);
1098 if (!skb)
1099 goto out;
1100
1101 if (dst) {
1102 mgmt = (struct ieee80211_mgmt *) skb->data;
1103 memcpy(mgmt->da, dst, ETH_ALEN);
1104 memcpy(mgmt->bssid, dst, ETH_ALEN);
1105 }
1106
1107 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1108
1109 out:
1110 kfree(buf);
1111
1112 return skb;
1113 }
1114
ieee80211_send_probe_req(struct ieee80211_sub_if_data * sdata,u8 * dst,const u8 * ssid,size_t ssid_len,const u8 * ie,size_t ie_len,u32 ratemask,bool directed,bool no_cck)1115 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1116 const u8 *ssid, size_t ssid_len,
1117 const u8 *ie, size_t ie_len,
1118 u32 ratemask, bool directed, bool no_cck)
1119 {
1120 struct sk_buff *skb;
1121
1122 skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1123 ie, ie_len, directed);
1124 if (skb) {
1125 if (no_cck)
1126 IEEE80211_SKB_CB(skb)->flags |=
1127 IEEE80211_TX_CTL_NO_CCK_RATE;
1128 ieee80211_tx_skb(sdata, skb);
1129 }
1130 }
1131
ieee80211_sta_get_rates(struct ieee80211_local * local,struct ieee802_11_elems * elems,enum ieee80211_band band)1132 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1133 struct ieee802_11_elems *elems,
1134 enum ieee80211_band band)
1135 {
1136 struct ieee80211_supported_band *sband;
1137 struct ieee80211_rate *bitrates;
1138 size_t num_rates;
1139 u32 supp_rates;
1140 int i, j;
1141 sband = local->hw.wiphy->bands[band];
1142
1143 if (!sband) {
1144 WARN_ON(1);
1145 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1146 }
1147
1148 bitrates = sband->bitrates;
1149 num_rates = sband->n_bitrates;
1150 supp_rates = 0;
1151 for (i = 0; i < elems->supp_rates_len +
1152 elems->ext_supp_rates_len; i++) {
1153 u8 rate = 0;
1154 int own_rate;
1155 if (i < elems->supp_rates_len)
1156 rate = elems->supp_rates[i];
1157 else if (elems->ext_supp_rates)
1158 rate = elems->ext_supp_rates
1159 [i - elems->supp_rates_len];
1160 own_rate = 5 * (rate & 0x7f);
1161 for (j = 0; j < num_rates; j++)
1162 if (bitrates[j].bitrate == own_rate)
1163 supp_rates |= BIT(j);
1164 }
1165 return supp_rates;
1166 }
1167
ieee80211_stop_device(struct ieee80211_local * local)1168 void ieee80211_stop_device(struct ieee80211_local *local)
1169 {
1170 ieee80211_led_radio(local, false);
1171 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1172
1173 cancel_work_sync(&local->reconfig_filter);
1174
1175 flush_workqueue(local->workqueue);
1176 drv_stop(local);
1177 }
1178
ieee80211_reconfig(struct ieee80211_local * local)1179 int ieee80211_reconfig(struct ieee80211_local *local)
1180 {
1181 struct ieee80211_hw *hw = &local->hw;
1182 struct ieee80211_sub_if_data *sdata;
1183 struct sta_info *sta;
1184 int res, i;
1185
1186 #ifdef CONFIG_PM
1187 if (local->suspended)
1188 local->resuming = true;
1189
1190 if (local->wowlan) {
1191 local->wowlan = false;
1192 res = drv_resume(local);
1193 if (res < 0) {
1194 local->resuming = false;
1195 return res;
1196 }
1197 if (res == 0)
1198 goto wake_up;
1199 WARN_ON(res > 1);
1200 /*
1201 * res is 1, which means the driver requested
1202 * to go through a regular reset on wakeup.
1203 */
1204 }
1205 #endif
1206 /* everything else happens only if HW was up & running */
1207 if (!local->open_count)
1208 goto wake_up;
1209
1210 /*
1211 * Upon resume hardware can sometimes be goofy due to
1212 * various platform / driver / bus issues, so restarting
1213 * the device may at times not work immediately. Propagate
1214 * the error.
1215 */
1216 res = drv_start(local);
1217 if (res) {
1218 WARN(local->suspended, "Hardware became unavailable "
1219 "upon resume. This could be a software issue "
1220 "prior to suspend or a hardware issue.\n");
1221 return res;
1222 }
1223
1224 /* setup fragmentation threshold */
1225 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1226
1227 /* setup RTS threshold */
1228 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1229
1230 /* reset coverage class */
1231 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1232
1233 ieee80211_led_radio(local, true);
1234 ieee80211_mod_tpt_led_trig(local,
1235 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1236
1237 /* add interfaces */
1238 list_for_each_entry(sdata, &local->interfaces, list) {
1239 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1240 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1241 ieee80211_sdata_running(sdata))
1242 res = drv_add_interface(local, sdata);
1243 }
1244
1245 /* add STAs back */
1246 mutex_lock(&local->sta_mtx);
1247 list_for_each_entry(sta, &local->sta_list, list) {
1248 if (sta->uploaded) {
1249 enum ieee80211_sta_state state;
1250
1251 for (state = IEEE80211_STA_NOTEXIST;
1252 state < sta->sta_state; state++)
1253 WARN_ON(drv_sta_state(local, sta->sdata, sta,
1254 state, state + 1));
1255 }
1256 }
1257 mutex_unlock(&local->sta_mtx);
1258
1259 /* reconfigure tx conf */
1260 list_for_each_entry(sdata, &local->interfaces, list) {
1261 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1262 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1263 !ieee80211_sdata_running(sdata))
1264 continue;
1265
1266 for (i = 0; i < hw->queues; i++)
1267 drv_conf_tx(local, sdata, i, &sdata->tx_conf[i]);
1268 }
1269
1270 /* reconfigure hardware */
1271 ieee80211_hw_config(local, ~0);
1272
1273 ieee80211_configure_filter(local);
1274
1275 /* Finally also reconfigure all the BSS information */
1276 list_for_each_entry(sdata, &local->interfaces, list) {
1277 u32 changed;
1278
1279 if (!ieee80211_sdata_running(sdata))
1280 continue;
1281
1282 /* common change flags for all interface types */
1283 changed = BSS_CHANGED_ERP_CTS_PROT |
1284 BSS_CHANGED_ERP_PREAMBLE |
1285 BSS_CHANGED_ERP_SLOT |
1286 BSS_CHANGED_HT |
1287 BSS_CHANGED_BASIC_RATES |
1288 BSS_CHANGED_BEACON_INT |
1289 BSS_CHANGED_BSSID |
1290 BSS_CHANGED_CQM |
1291 BSS_CHANGED_QOS |
1292 BSS_CHANGED_IDLE;
1293
1294 switch (sdata->vif.type) {
1295 case NL80211_IFTYPE_STATION:
1296 changed |= BSS_CHANGED_ASSOC |
1297 BSS_CHANGED_ARP_FILTER;
1298 mutex_lock(&sdata->u.mgd.mtx);
1299 ieee80211_bss_info_change_notify(sdata, changed);
1300 mutex_unlock(&sdata->u.mgd.mtx);
1301 break;
1302 case NL80211_IFTYPE_ADHOC:
1303 changed |= BSS_CHANGED_IBSS;
1304 /* fall through */
1305 case NL80211_IFTYPE_AP:
1306 changed |= BSS_CHANGED_SSID;
1307
1308 if (sdata->vif.type == NL80211_IFTYPE_AP)
1309 changed |= BSS_CHANGED_AP_PROBE_RESP;
1310
1311 /* fall through */
1312 case NL80211_IFTYPE_MESH_POINT:
1313 changed |= BSS_CHANGED_BEACON |
1314 BSS_CHANGED_BEACON_ENABLED;
1315 ieee80211_bss_info_change_notify(sdata, changed);
1316 break;
1317 case NL80211_IFTYPE_WDS:
1318 break;
1319 case NL80211_IFTYPE_AP_VLAN:
1320 case NL80211_IFTYPE_MONITOR:
1321 /* ignore virtual */
1322 break;
1323 case NL80211_IFTYPE_UNSPECIFIED:
1324 case NUM_NL80211_IFTYPES:
1325 case NL80211_IFTYPE_P2P_CLIENT:
1326 case NL80211_IFTYPE_P2P_GO:
1327 WARN_ON(1);
1328 break;
1329 }
1330 }
1331
1332 ieee80211_recalc_ps(local, -1);
1333
1334 /*
1335 * The sta might be in psm against the ap (e.g. because
1336 * this was the state before a hw restart), so we
1337 * explicitly send a null packet in order to make sure
1338 * it'll sync against the ap (and get out of psm).
1339 */
1340 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1341 list_for_each_entry(sdata, &local->interfaces, list) {
1342 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1343 continue;
1344 if (!sdata->u.mgd.associated)
1345 continue;
1346
1347 ieee80211_send_nullfunc(local, sdata, 0);
1348 }
1349 }
1350
1351 /* add back keys */
1352 list_for_each_entry(sdata, &local->interfaces, list)
1353 if (ieee80211_sdata_running(sdata))
1354 ieee80211_enable_keys(sdata);
1355
1356 wake_up:
1357 /*
1358 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1359 * sessions can be established after a resume.
1360 *
1361 * Also tear down aggregation sessions since reconfiguring
1362 * them in a hardware restart scenario is not easily done
1363 * right now, and the hardware will have lost information
1364 * about the sessions, but we and the AP still think they
1365 * are active. This is really a workaround though.
1366 */
1367 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1368 mutex_lock(&local->sta_mtx);
1369
1370 list_for_each_entry(sta, &local->sta_list, list) {
1371 ieee80211_sta_tear_down_BA_sessions(sta, true);
1372 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1373 }
1374
1375 mutex_unlock(&local->sta_mtx);
1376 }
1377
1378 ieee80211_wake_queues_by_reason(hw,
1379 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1380
1381 /*
1382 * If this is for hw restart things are still running.
1383 * We may want to change that later, however.
1384 */
1385 if (!local->suspended)
1386 return 0;
1387
1388 #ifdef CONFIG_PM
1389 /* first set suspended false, then resuming */
1390 local->suspended = false;
1391 mb();
1392 local->resuming = false;
1393
1394 list_for_each_entry(sdata, &local->interfaces, list) {
1395 switch(sdata->vif.type) {
1396 case NL80211_IFTYPE_STATION:
1397 ieee80211_sta_restart(sdata);
1398 break;
1399 case NL80211_IFTYPE_ADHOC:
1400 ieee80211_ibss_restart(sdata);
1401 break;
1402 case NL80211_IFTYPE_MESH_POINT:
1403 ieee80211_mesh_restart(sdata);
1404 break;
1405 default:
1406 break;
1407 }
1408 }
1409
1410 mod_timer(&local->sta_cleanup, jiffies + 1);
1411
1412 mutex_lock(&local->sta_mtx);
1413 list_for_each_entry(sta, &local->sta_list, list)
1414 mesh_plink_restart(sta);
1415 mutex_unlock(&local->sta_mtx);
1416 #else
1417 WARN_ON(1);
1418 #endif
1419 return 0;
1420 }
1421
ieee80211_resume_disconnect(struct ieee80211_vif * vif)1422 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1423 {
1424 struct ieee80211_sub_if_data *sdata;
1425 struct ieee80211_local *local;
1426 struct ieee80211_key *key;
1427
1428 if (WARN_ON(!vif))
1429 return;
1430
1431 sdata = vif_to_sdata(vif);
1432 local = sdata->local;
1433
1434 if (WARN_ON(!local->resuming))
1435 return;
1436
1437 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1438 return;
1439
1440 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1441
1442 mutex_lock(&local->key_mtx);
1443 list_for_each_entry(key, &sdata->key_list, list)
1444 key->flags |= KEY_FLAG_TAINTED;
1445 mutex_unlock(&local->key_mtx);
1446 }
1447 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1448
check_mgd_smps(struct ieee80211_if_managed * ifmgd,enum ieee80211_smps_mode * smps_mode)1449 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1450 enum ieee80211_smps_mode *smps_mode)
1451 {
1452 if (ifmgd->associated) {
1453 *smps_mode = ifmgd->ap_smps;
1454
1455 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1456 if (ifmgd->powersave)
1457 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1458 else
1459 *smps_mode = IEEE80211_SMPS_OFF;
1460 }
1461
1462 return 1;
1463 }
1464
1465 return 0;
1466 }
1467
1468 /* must hold iflist_mtx */
ieee80211_recalc_smps(struct ieee80211_local * local)1469 void ieee80211_recalc_smps(struct ieee80211_local *local)
1470 {
1471 struct ieee80211_sub_if_data *sdata;
1472 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1473 int count = 0;
1474
1475 lockdep_assert_held(&local->iflist_mtx);
1476
1477 /*
1478 * This function could be improved to handle multiple
1479 * interfaces better, but right now it makes any
1480 * non-station interfaces force SM PS to be turned
1481 * off. If there are multiple station interfaces it
1482 * could also use the best possible mode, e.g. if
1483 * one is in static and the other in dynamic then
1484 * dynamic is ok.
1485 */
1486
1487 list_for_each_entry(sdata, &local->interfaces, list) {
1488 if (!ieee80211_sdata_running(sdata))
1489 continue;
1490 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1491 goto set;
1492
1493 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1494
1495 if (count > 1) {
1496 smps_mode = IEEE80211_SMPS_OFF;
1497 break;
1498 }
1499 }
1500
1501 if (smps_mode == local->smps_mode)
1502 return;
1503
1504 set:
1505 local->smps_mode = smps_mode;
1506 /* changed flag is auto-detected for this */
1507 ieee80211_hw_config(local, 0);
1508 }
1509
ieee80211_id_in_list(const u8 * ids,int n_ids,u8 id)1510 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1511 {
1512 int i;
1513
1514 for (i = 0; i < n_ids; i++)
1515 if (ids[i] == id)
1516 return true;
1517 return false;
1518 }
1519
1520 /**
1521 * ieee80211_ie_split - split an IE buffer according to ordering
1522 *
1523 * @ies: the IE buffer
1524 * @ielen: the length of the IE buffer
1525 * @ids: an array with element IDs that are allowed before
1526 * the split
1527 * @n_ids: the size of the element ID array
1528 * @offset: offset where to start splitting in the buffer
1529 *
1530 * This function splits an IE buffer by updating the @offset
1531 * variable to point to the location where the buffer should be
1532 * split.
1533 *
1534 * It assumes that the given IE buffer is well-formed, this
1535 * has to be guaranteed by the caller!
1536 *
1537 * It also assumes that the IEs in the buffer are ordered
1538 * correctly, if not the result of using this function will not
1539 * be ordered correctly either, i.e. it does no reordering.
1540 *
1541 * The function returns the offset where the next part of the
1542 * buffer starts, which may be @ielen if the entire (remainder)
1543 * of the buffer should be used.
1544 */
ieee80211_ie_split(const u8 * ies,size_t ielen,const u8 * ids,int n_ids,size_t offset)1545 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1546 const u8 *ids, int n_ids, size_t offset)
1547 {
1548 size_t pos = offset;
1549
1550 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1551 pos += 2 + ies[pos + 1];
1552
1553 return pos;
1554 }
1555
ieee80211_ie_split_vendor(const u8 * ies,size_t ielen,size_t offset)1556 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1557 {
1558 size_t pos = offset;
1559
1560 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1561 pos += 2 + ies[pos + 1];
1562
1563 return pos;
1564 }
1565
_ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data * sdata,int rssi_min_thold,int rssi_max_thold)1566 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1567 int rssi_min_thold,
1568 int rssi_max_thold)
1569 {
1570 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1571
1572 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1573 return;
1574
1575 /*
1576 * Scale up threshold values before storing it, as the RSSI averaging
1577 * algorithm uses a scaled up value as well. Change this scaling
1578 * factor if the RSSI averaging algorithm changes.
1579 */
1580 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1581 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1582 }
1583
ieee80211_enable_rssi_reports(struct ieee80211_vif * vif,int rssi_min_thold,int rssi_max_thold)1584 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1585 int rssi_min_thold,
1586 int rssi_max_thold)
1587 {
1588 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1589
1590 WARN_ON(rssi_min_thold == rssi_max_thold ||
1591 rssi_min_thold > rssi_max_thold);
1592
1593 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1594 rssi_max_thold);
1595 }
1596 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1597
ieee80211_disable_rssi_reports(struct ieee80211_vif * vif)1598 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1599 {
1600 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1601
1602 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1603 }
1604 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1605
ieee80211_ie_build_ht_cap(u8 * pos,struct ieee80211_sta_ht_cap * ht_cap,u16 cap)1606 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1607 u16 cap)
1608 {
1609 __le16 tmp;
1610
1611 *pos++ = WLAN_EID_HT_CAPABILITY;
1612 *pos++ = sizeof(struct ieee80211_ht_cap);
1613 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1614
1615 /* capability flags */
1616 tmp = cpu_to_le16(cap);
1617 memcpy(pos, &tmp, sizeof(u16));
1618 pos += sizeof(u16);
1619
1620 /* AMPDU parameters */
1621 *pos++ = ht_cap->ampdu_factor |
1622 (ht_cap->ampdu_density <<
1623 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1624
1625 /* MCS set */
1626 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1627 pos += sizeof(ht_cap->mcs);
1628
1629 /* extended capabilities */
1630 pos += sizeof(__le16);
1631
1632 /* BF capabilities */
1633 pos += sizeof(__le32);
1634
1635 /* antenna selection */
1636 pos += sizeof(u8);
1637
1638 return pos;
1639 }
1640
ieee80211_ie_build_ht_info(u8 * pos,struct ieee80211_sta_ht_cap * ht_cap,struct ieee80211_channel * channel,enum nl80211_channel_type channel_type)1641 u8 *ieee80211_ie_build_ht_info(u8 *pos,
1642 struct ieee80211_sta_ht_cap *ht_cap,
1643 struct ieee80211_channel *channel,
1644 enum nl80211_channel_type channel_type)
1645 {
1646 struct ieee80211_ht_info *ht_info;
1647 /* Build HT Information */
1648 *pos++ = WLAN_EID_HT_INFORMATION;
1649 *pos++ = sizeof(struct ieee80211_ht_info);
1650 ht_info = (struct ieee80211_ht_info *)pos;
1651 ht_info->control_chan =
1652 ieee80211_frequency_to_channel(channel->center_freq);
1653 switch (channel_type) {
1654 case NL80211_CHAN_HT40MINUS:
1655 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1656 break;
1657 case NL80211_CHAN_HT40PLUS:
1658 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1659 break;
1660 case NL80211_CHAN_HT20:
1661 default:
1662 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1663 break;
1664 }
1665 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
1666 ht_info->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1667
1668 /*
1669 * Note: According to 802.11n-2009 9.13.3.1, HT Protection field and
1670 * RIFS Mode are reserved in IBSS mode, therefore keep them at 0
1671 */
1672 ht_info->operation_mode = 0x0000;
1673 ht_info->stbc_param = 0x0000;
1674
1675 /* It seems that Basic MCS set and Supported MCS set
1676 are identical for the first 10 bytes */
1677 memset(&ht_info->basic_set, 0, 16);
1678 memcpy(&ht_info->basic_set, &ht_cap->mcs, 10);
1679
1680 return pos + sizeof(struct ieee80211_ht_info);
1681 }
1682
1683 enum nl80211_channel_type
ieee80211_ht_info_to_channel_type(struct ieee80211_ht_info * ht_info)1684 ieee80211_ht_info_to_channel_type(struct ieee80211_ht_info *ht_info)
1685 {
1686 enum nl80211_channel_type channel_type;
1687
1688 if (!ht_info)
1689 return NL80211_CHAN_NO_HT;
1690
1691 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1692 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1693 channel_type = NL80211_CHAN_HT20;
1694 break;
1695 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1696 channel_type = NL80211_CHAN_HT40PLUS;
1697 break;
1698 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1699 channel_type = NL80211_CHAN_HT40MINUS;
1700 break;
1701 default:
1702 channel_type = NL80211_CHAN_NO_HT;
1703 }
1704
1705 return channel_type;
1706 }
1707
ieee80211_add_srates_ie(struct ieee80211_vif * vif,struct sk_buff * skb)1708 int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1709 {
1710 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1711 struct ieee80211_local *local = sdata->local;
1712 struct ieee80211_supported_band *sband;
1713 int rate;
1714 u8 i, rates, *pos;
1715
1716 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1717 rates = sband->n_bitrates;
1718 if (rates > 8)
1719 rates = 8;
1720
1721 if (skb_tailroom(skb) < rates + 2)
1722 return -ENOMEM;
1723
1724 pos = skb_put(skb, rates + 2);
1725 *pos++ = WLAN_EID_SUPP_RATES;
1726 *pos++ = rates;
1727 for (i = 0; i < rates; i++) {
1728 rate = sband->bitrates[i].bitrate;
1729 *pos++ = (u8) (rate / 5);
1730 }
1731
1732 return 0;
1733 }
1734
ieee80211_add_ext_srates_ie(struct ieee80211_vif * vif,struct sk_buff * skb)1735 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1736 {
1737 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1738 struct ieee80211_local *local = sdata->local;
1739 struct ieee80211_supported_band *sband;
1740 int rate;
1741 u8 i, exrates, *pos;
1742
1743 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1744 exrates = sband->n_bitrates;
1745 if (exrates > 8)
1746 exrates -= 8;
1747 else
1748 exrates = 0;
1749
1750 if (skb_tailroom(skb) < exrates + 2)
1751 return -ENOMEM;
1752
1753 if (exrates) {
1754 pos = skb_put(skb, exrates + 2);
1755 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1756 *pos++ = exrates;
1757 for (i = 8; i < sband->n_bitrates; i++) {
1758 rate = sband->bitrates[i].bitrate;
1759 *pos++ = (u8) (rate / 5);
1760 }
1761 }
1762 return 0;
1763 }
1764