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mac80211: add hardware restart function
[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/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/wireless.h>
22 #include <linux/bitmap.h>
23 #include <net/net_namespace.h>
24 #include <net/cfg80211.h>
25 #include <net/rtnetlink.h>
26
27 #include "ieee80211_i.h"
28 #include "rate.h"
29 #include "mesh.h"
30 #include "wme.h"
31 #include "led.h"
32
33 /* privid for wiphys to determine whether they belong to us or not */
34 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
35
36 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
37 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
38 const unsigned char rfc1042_header[] __aligned(2) =
39 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
40
41 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
42 const unsigned char bridge_tunnel_header[] __aligned(2) =
43 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
44
45 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
46 {
47 struct ieee80211_local *local;
48 BUG_ON(!wiphy);
49
50 local = wiphy_priv(wiphy);
51 return &local->hw;
52 }
53 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
54
55 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
56 enum nl80211_iftype type)
57 {
58 __le16 fc = hdr->frame_control;
59
60 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
61 if (len < 16)
62 return NULL;
63
64 if (ieee80211_is_data(fc)) {
65 if (len < 24) /* drop incorrect hdr len (data) */
66 return NULL;
67
68 if (ieee80211_has_a4(fc))
69 return NULL;
70 if (ieee80211_has_tods(fc))
71 return hdr->addr1;
72 if (ieee80211_has_fromds(fc))
73 return hdr->addr2;
74
75 return hdr->addr3;
76 }
77
78 if (ieee80211_is_mgmt(fc)) {
79 if (len < 24) /* drop incorrect hdr len (mgmt) */
80 return NULL;
81 return hdr->addr3;
82 }
83
84 if (ieee80211_is_ctl(fc)) {
85 if(ieee80211_is_pspoll(fc))
86 return hdr->addr1;
87
88 if (ieee80211_is_back_req(fc)) {
89 switch (type) {
90 case NL80211_IFTYPE_STATION:
91 return hdr->addr2;
92 case NL80211_IFTYPE_AP:
93 case NL80211_IFTYPE_AP_VLAN:
94 return hdr->addr1;
95 default:
96 break; /* fall through to the return */
97 }
98 }
99 }
100
101 return NULL;
102 }
103
104 unsigned int ieee80211_hdrlen(__le16 fc)
105 {
106 unsigned int hdrlen = 24;
107
108 if (ieee80211_is_data(fc)) {
109 if (ieee80211_has_a4(fc))
110 hdrlen = 30;
111 if (ieee80211_is_data_qos(fc))
112 hdrlen += IEEE80211_QOS_CTL_LEN;
113 goto out;
114 }
115
116 if (ieee80211_is_ctl(fc)) {
117 /*
118 * ACK and CTS are 10 bytes, all others 16. To see how
119 * to get this condition consider
120 * subtype mask: 0b0000000011110000 (0x00F0)
121 * ACK subtype: 0b0000000011010000 (0x00D0)
122 * CTS subtype: 0b0000000011000000 (0x00C0)
123 * bits that matter: ^^^ (0x00E0)
124 * value of those: 0b0000000011000000 (0x00C0)
125 */
126 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
127 hdrlen = 10;
128 else
129 hdrlen = 16;
130 }
131 out:
132 return hdrlen;
133 }
134 EXPORT_SYMBOL(ieee80211_hdrlen);
135
136 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
137 {
138 const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
139 unsigned int hdrlen;
140
141 if (unlikely(skb->len < 10))
142 return 0;
143 hdrlen = ieee80211_hdrlen(hdr->frame_control);
144 if (unlikely(hdrlen > skb->len))
145 return 0;
146 return hdrlen;
147 }
148 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
149
150 int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
151 {
152 int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
153 /* 7.1.3.5a.2 */
154 switch (ae) {
155 case 0:
156 return 6;
157 case 1:
158 return 12;
159 case 2:
160 return 18;
161 case 3:
162 return 24;
163 default:
164 return 6;
165 }
166 }
167
168 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
169 {
170 struct sk_buff *skb = tx->skb;
171 struct ieee80211_hdr *hdr;
172
173 do {
174 hdr = (struct ieee80211_hdr *) skb->data;
175 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
176 } while ((skb = skb->next));
177 }
178
179 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
180 int rate, int erp, int short_preamble)
181 {
182 int dur;
183
184 /* calculate duration (in microseconds, rounded up to next higher
185 * integer if it includes a fractional microsecond) to send frame of
186 * len bytes (does not include FCS) at the given rate. Duration will
187 * also include SIFS.
188 *
189 * rate is in 100 kbps, so divident is multiplied by 10 in the
190 * DIV_ROUND_UP() operations.
191 */
192
193 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
194 /*
195 * OFDM:
196 *
197 * N_DBPS = DATARATE x 4
198 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
199 * (16 = SIGNAL time, 6 = tail bits)
200 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
201 *
202 * T_SYM = 4 usec
203 * 802.11a - 17.5.2: aSIFSTime = 16 usec
204 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
205 * signal ext = 6 usec
206 */
207 dur = 16; /* SIFS + signal ext */
208 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
209 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
210 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
211 4 * rate); /* T_SYM x N_SYM */
212 } else {
213 /*
214 * 802.11b or 802.11g with 802.11b compatibility:
215 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
216 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
217 *
218 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
219 * aSIFSTime = 10 usec
220 * aPreambleLength = 144 usec or 72 usec with short preamble
221 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
222 */
223 dur = 10; /* aSIFSTime = 10 usec */
224 dur += short_preamble ? (72 + 24) : (144 + 48);
225
226 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
227 }
228
229 return dur;
230 }
231
232 /* Exported duration function for driver use */
233 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
234 struct ieee80211_vif *vif,
235 size_t frame_len,
236 struct ieee80211_rate *rate)
237 {
238 struct ieee80211_local *local = hw_to_local(hw);
239 struct ieee80211_sub_if_data *sdata;
240 u16 dur;
241 int erp;
242 bool short_preamble = false;
243
244 erp = 0;
245 if (vif) {
246 sdata = vif_to_sdata(vif);
247 short_preamble = sdata->vif.bss_conf.use_short_preamble;
248 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
249 erp = rate->flags & IEEE80211_RATE_ERP_G;
250 }
251
252 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
253 short_preamble);
254
255 return cpu_to_le16(dur);
256 }
257 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
258
259 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
260 struct ieee80211_vif *vif, size_t frame_len,
261 const struct ieee80211_tx_info *frame_txctl)
262 {
263 struct ieee80211_local *local = hw_to_local(hw);
264 struct ieee80211_rate *rate;
265 struct ieee80211_sub_if_data *sdata;
266 bool short_preamble;
267 int erp;
268 u16 dur;
269 struct ieee80211_supported_band *sband;
270
271 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
272
273 short_preamble = false;
274
275 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
276
277 erp = 0;
278 if (vif) {
279 sdata = vif_to_sdata(vif);
280 short_preamble = sdata->vif.bss_conf.use_short_preamble;
281 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
282 erp = rate->flags & IEEE80211_RATE_ERP_G;
283 }
284
285 /* CTS duration */
286 dur = ieee80211_frame_duration(local, 10, rate->bitrate,
287 erp, short_preamble);
288 /* Data frame duration */
289 dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
290 erp, short_preamble);
291 /* ACK duration */
292 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
293 erp, short_preamble);
294
295 return cpu_to_le16(dur);
296 }
297 EXPORT_SYMBOL(ieee80211_rts_duration);
298
299 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
300 struct ieee80211_vif *vif,
301 size_t frame_len,
302 const struct ieee80211_tx_info *frame_txctl)
303 {
304 struct ieee80211_local *local = hw_to_local(hw);
305 struct ieee80211_rate *rate;
306 struct ieee80211_sub_if_data *sdata;
307 bool short_preamble;
308 int erp;
309 u16 dur;
310 struct ieee80211_supported_band *sband;
311
312 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
313
314 short_preamble = false;
315
316 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
317 erp = 0;
318 if (vif) {
319 sdata = vif_to_sdata(vif);
320 short_preamble = sdata->vif.bss_conf.use_short_preamble;
321 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
322 erp = rate->flags & IEEE80211_RATE_ERP_G;
323 }
324
325 /* Data frame duration */
326 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
327 erp, short_preamble);
328 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
329 /* ACK duration */
330 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
331 erp, short_preamble);
332 }
333
334 return cpu_to_le16(dur);
335 }
336 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
337
338 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
339 enum queue_stop_reason reason)
340 {
341 struct ieee80211_local *local = hw_to_local(hw);
342
343 if (WARN_ON(queue >= hw->queues))
344 return;
345
346 __clear_bit(reason, &local->queue_stop_reasons[queue]);
347
348 if (!skb_queue_empty(&local->pending[queue]) &&
349 local->queue_stop_reasons[queue] ==
350 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
351 tasklet_schedule(&local->tx_pending_tasklet);
352
353 if (local->queue_stop_reasons[queue] != 0)
354 /* someone still has this queue stopped */
355 return;
356
357 netif_wake_subqueue(local->mdev, queue);
358 }
359
360 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
361 enum queue_stop_reason reason)
362 {
363 struct ieee80211_local *local = hw_to_local(hw);
364 unsigned long flags;
365
366 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
367 __ieee80211_wake_queue(hw, queue, reason);
368 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
369 }
370
371 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
372 {
373 ieee80211_wake_queue_by_reason(hw, queue,
374 IEEE80211_QUEUE_STOP_REASON_DRIVER);
375 }
376 EXPORT_SYMBOL(ieee80211_wake_queue);
377
378 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
379 enum queue_stop_reason reason)
380 {
381 struct ieee80211_local *local = hw_to_local(hw);
382
383 if (WARN_ON(queue >= hw->queues))
384 return;
385
386 /*
387 * Only stop if it was previously running, this is necessary
388 * for correct pending packets handling because there we may
389 * start (but not wake) the queue and rely on that.
390 */
391 if (!local->queue_stop_reasons[queue])
392 netif_stop_subqueue(local->mdev, queue);
393
394 __set_bit(reason, &local->queue_stop_reasons[queue]);
395 }
396
397 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
398 enum queue_stop_reason reason)
399 {
400 struct ieee80211_local *local = hw_to_local(hw);
401 unsigned long flags;
402
403 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
404 __ieee80211_stop_queue(hw, queue, reason);
405 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
406 }
407
408 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
409 {
410 ieee80211_stop_queue_by_reason(hw, queue,
411 IEEE80211_QUEUE_STOP_REASON_DRIVER);
412 }
413 EXPORT_SYMBOL(ieee80211_stop_queue);
414
415 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
416 enum queue_stop_reason reason)
417 {
418 struct ieee80211_local *local = hw_to_local(hw);
419 unsigned long flags;
420 int i;
421
422 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
423
424 for (i = 0; i < hw->queues; i++)
425 __ieee80211_stop_queue(hw, i, reason);
426
427 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
428 }
429
430 void ieee80211_stop_queues(struct ieee80211_hw *hw)
431 {
432 ieee80211_stop_queues_by_reason(hw,
433 IEEE80211_QUEUE_STOP_REASON_DRIVER);
434 }
435 EXPORT_SYMBOL(ieee80211_stop_queues);
436
437 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
438 {
439 struct ieee80211_local *local = hw_to_local(hw);
440
441 if (WARN_ON(queue >= hw->queues))
442 return true;
443
444 return __netif_subqueue_stopped(local->mdev, queue);
445 }
446 EXPORT_SYMBOL(ieee80211_queue_stopped);
447
448 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
449 enum queue_stop_reason reason)
450 {
451 struct ieee80211_local *local = hw_to_local(hw);
452 unsigned long flags;
453 int i;
454
455 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
456
457 for (i = 0; i < hw->queues; i++)
458 __ieee80211_wake_queue(hw, i, reason);
459
460 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
461 }
462
463 void ieee80211_wake_queues(struct ieee80211_hw *hw)
464 {
465 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
466 }
467 EXPORT_SYMBOL(ieee80211_wake_queues);
468
469 void ieee80211_iterate_active_interfaces(
470 struct ieee80211_hw *hw,
471 void (*iterator)(void *data, u8 *mac,
472 struct ieee80211_vif *vif),
473 void *data)
474 {
475 struct ieee80211_local *local = hw_to_local(hw);
476 struct ieee80211_sub_if_data *sdata;
477
478 mutex_lock(&local->iflist_mtx);
479
480 list_for_each_entry(sdata, &local->interfaces, list) {
481 switch (sdata->vif.type) {
482 case __NL80211_IFTYPE_AFTER_LAST:
483 case NL80211_IFTYPE_UNSPECIFIED:
484 case NL80211_IFTYPE_MONITOR:
485 case NL80211_IFTYPE_AP_VLAN:
486 continue;
487 case NL80211_IFTYPE_AP:
488 case NL80211_IFTYPE_STATION:
489 case NL80211_IFTYPE_ADHOC:
490 case NL80211_IFTYPE_WDS:
491 case NL80211_IFTYPE_MESH_POINT:
492 break;
493 }
494 if (netif_running(sdata->dev))
495 iterator(data, sdata->dev->dev_addr,
496 &sdata->vif);
497 }
498
499 mutex_unlock(&local->iflist_mtx);
500 }
501 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
502
503 void ieee80211_iterate_active_interfaces_atomic(
504 struct ieee80211_hw *hw,
505 void (*iterator)(void *data, u8 *mac,
506 struct ieee80211_vif *vif),
507 void *data)
508 {
509 struct ieee80211_local *local = hw_to_local(hw);
510 struct ieee80211_sub_if_data *sdata;
511
512 rcu_read_lock();
513
514 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
515 switch (sdata->vif.type) {
516 case __NL80211_IFTYPE_AFTER_LAST:
517 case NL80211_IFTYPE_UNSPECIFIED:
518 case NL80211_IFTYPE_MONITOR:
519 case NL80211_IFTYPE_AP_VLAN:
520 continue;
521 case NL80211_IFTYPE_AP:
522 case NL80211_IFTYPE_STATION:
523 case NL80211_IFTYPE_ADHOC:
524 case NL80211_IFTYPE_WDS:
525 case NL80211_IFTYPE_MESH_POINT:
526 break;
527 }
528 if (netif_running(sdata->dev))
529 iterator(data, sdata->dev->dev_addr,
530 &sdata->vif);
531 }
532
533 rcu_read_unlock();
534 }
535 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
536
537 void ieee802_11_parse_elems(u8 *start, size_t len,
538 struct ieee802_11_elems *elems)
539 {
540 size_t left = len;
541 u8 *pos = start;
542
543 memset(elems, 0, sizeof(*elems));
544 elems->ie_start = start;
545 elems->total_len = len;
546
547 while (left >= 2) {
548 u8 id, elen;
549
550 id = *pos++;
551 elen = *pos++;
552 left -= 2;
553
554 if (elen > left)
555 return;
556
557 switch (id) {
558 case WLAN_EID_SSID:
559 elems->ssid = pos;
560 elems->ssid_len = elen;
561 break;
562 case WLAN_EID_SUPP_RATES:
563 elems->supp_rates = pos;
564 elems->supp_rates_len = elen;
565 break;
566 case WLAN_EID_FH_PARAMS:
567 elems->fh_params = pos;
568 elems->fh_params_len = elen;
569 break;
570 case WLAN_EID_DS_PARAMS:
571 elems->ds_params = pos;
572 elems->ds_params_len = elen;
573 break;
574 case WLAN_EID_CF_PARAMS:
575 elems->cf_params = pos;
576 elems->cf_params_len = elen;
577 break;
578 case WLAN_EID_TIM:
579 elems->tim = pos;
580 elems->tim_len = elen;
581 break;
582 case WLAN_EID_IBSS_PARAMS:
583 elems->ibss_params = pos;
584 elems->ibss_params_len = elen;
585 break;
586 case WLAN_EID_CHALLENGE:
587 elems->challenge = pos;
588 elems->challenge_len = elen;
589 break;
590 case WLAN_EID_WPA:
591 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
592 pos[2] == 0xf2) {
593 /* Microsoft OUI (00:50:F2) */
594 if (pos[3] == 1) {
595 /* OUI Type 1 - WPA IE */
596 elems->wpa = pos;
597 elems->wpa_len = elen;
598 } else if (elen >= 5 && pos[3] == 2) {
599 if (pos[4] == 0) {
600 elems->wmm_info = pos;
601 elems->wmm_info_len = elen;
602 } else if (pos[4] == 1) {
603 elems->wmm_param = pos;
604 elems->wmm_param_len = elen;
605 }
606 }
607 }
608 break;
609 case WLAN_EID_RSN:
610 elems->rsn = pos;
611 elems->rsn_len = elen;
612 break;
613 case WLAN_EID_ERP_INFO:
614 elems->erp_info = pos;
615 elems->erp_info_len = elen;
616 break;
617 case WLAN_EID_EXT_SUPP_RATES:
618 elems->ext_supp_rates = pos;
619 elems->ext_supp_rates_len = elen;
620 break;
621 case WLAN_EID_HT_CAPABILITY:
622 if (elen >= sizeof(struct ieee80211_ht_cap))
623 elems->ht_cap_elem = (void *)pos;
624 break;
625 case WLAN_EID_HT_INFORMATION:
626 if (elen >= sizeof(struct ieee80211_ht_info))
627 elems->ht_info_elem = (void *)pos;
628 break;
629 case WLAN_EID_MESH_ID:
630 elems->mesh_id = pos;
631 elems->mesh_id_len = elen;
632 break;
633 case WLAN_EID_MESH_CONFIG:
634 elems->mesh_config = pos;
635 elems->mesh_config_len = elen;
636 break;
637 case WLAN_EID_PEER_LINK:
638 elems->peer_link = pos;
639 elems->peer_link_len = elen;
640 break;
641 case WLAN_EID_PREQ:
642 elems->preq = pos;
643 elems->preq_len = elen;
644 break;
645 case WLAN_EID_PREP:
646 elems->prep = pos;
647 elems->prep_len = elen;
648 break;
649 case WLAN_EID_PERR:
650 elems->perr = pos;
651 elems->perr_len = elen;
652 break;
653 case WLAN_EID_CHANNEL_SWITCH:
654 elems->ch_switch_elem = pos;
655 elems->ch_switch_elem_len = elen;
656 break;
657 case WLAN_EID_QUIET:
658 if (!elems->quiet_elem) {
659 elems->quiet_elem = pos;
660 elems->quiet_elem_len = elen;
661 }
662 elems->num_of_quiet_elem++;
663 break;
664 case WLAN_EID_COUNTRY:
665 elems->country_elem = pos;
666 elems->country_elem_len = elen;
667 break;
668 case WLAN_EID_PWR_CONSTRAINT:
669 elems->pwr_constr_elem = pos;
670 elems->pwr_constr_elem_len = elen;
671 break;
672 case WLAN_EID_TIMEOUT_INTERVAL:
673 elems->timeout_int = pos;
674 elems->timeout_int_len = elen;
675 break;
676 default:
677 break;
678 }
679
680 left -= elen;
681 pos += elen;
682 }
683 }
684
685 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
686 {
687 struct ieee80211_local *local = sdata->local;
688 struct ieee80211_tx_queue_params qparam;
689 int i;
690
691 if (!local->ops->conf_tx)
692 return;
693
694 memset(&qparam, 0, sizeof(qparam));
695
696 qparam.aifs = 2;
697
698 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
699 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
700 qparam.cw_min = 31;
701 else
702 qparam.cw_min = 15;
703
704 qparam.cw_max = 1023;
705 qparam.txop = 0;
706
707 for (i = 0; i < local_to_hw(local)->queues; i++)
708 local->ops->conf_tx(local_to_hw(local), i, &qparam);
709 }
710
711 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
712 const size_t supp_rates_len,
713 const u8 *supp_rates)
714 {
715 struct ieee80211_local *local = sdata->local;
716 int i, have_higher_than_11mbit = 0;
717
718 /* cf. IEEE 802.11 9.2.12 */
719 for (i = 0; i < supp_rates_len; i++)
720 if ((supp_rates[i] & 0x7f) * 5 > 110)
721 have_higher_than_11mbit = 1;
722
723 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
724 have_higher_than_11mbit)
725 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
726 else
727 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
728
729 ieee80211_set_wmm_default(sdata);
730 }
731
732 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
733 int encrypt)
734 {
735 skb->dev = sdata->local->mdev;
736 skb_set_mac_header(skb, 0);
737 skb_set_network_header(skb, 0);
738 skb_set_transport_header(skb, 0);
739
740 skb->iif = sdata->dev->ifindex;
741 skb->do_not_encrypt = !encrypt;
742
743 dev_queue_xmit(skb);
744 }
745
746 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
747 {
748 int ret = -EINVAL;
749 struct ieee80211_channel *chan;
750 struct ieee80211_local *local = sdata->local;
751
752 chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
753
754 if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
755 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
756 chan->flags & IEEE80211_CHAN_NO_IBSS)
757 return ret;
758 local->oper_channel = chan;
759 local->oper_channel_type = NL80211_CHAN_NO_HT;
760
761 if (local->sw_scanning || local->hw_scanning)
762 ret = 0;
763 else
764 ret = ieee80211_hw_config(
765 local, IEEE80211_CONF_CHANGE_CHANNEL);
766 }
767
768 return ret;
769 }
770
771 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
772 enum ieee80211_band band)
773 {
774 struct ieee80211_supported_band *sband;
775 struct ieee80211_rate *bitrates;
776 u32 mandatory_rates;
777 enum ieee80211_rate_flags mandatory_flag;
778 int i;
779
780 sband = local->hw.wiphy->bands[band];
781 if (!sband) {
782 WARN_ON(1);
783 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
784 }
785
786 if (band == IEEE80211_BAND_2GHZ)
787 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
788 else
789 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
790
791 bitrates = sband->bitrates;
792 mandatory_rates = 0;
793 for (i = 0; i < sband->n_bitrates; i++)
794 if (bitrates[i].flags & mandatory_flag)
795 mandatory_rates |= BIT(i);
796 return mandatory_rates;
797 }
798
799 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
800 u16 transaction, u16 auth_alg,
801 u8 *extra, size_t extra_len,
802 const u8 *bssid, int encrypt)
803 {
804 struct ieee80211_local *local = sdata->local;
805 struct sk_buff *skb;
806 struct ieee80211_mgmt *mgmt;
807
808 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
809 sizeof(*mgmt) + 6 + extra_len);
810 if (!skb) {
811 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
812 "frame\n", sdata->dev->name);
813 return;
814 }
815 skb_reserve(skb, local->hw.extra_tx_headroom);
816
817 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
818 memset(mgmt, 0, 24 + 6);
819 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
820 IEEE80211_STYPE_AUTH);
821 if (encrypt)
822 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
823 memcpy(mgmt->da, bssid, ETH_ALEN);
824 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
825 memcpy(mgmt->bssid, bssid, ETH_ALEN);
826 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
827 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
828 mgmt->u.auth.status_code = cpu_to_le16(0);
829 if (extra)
830 memcpy(skb_put(skb, extra_len), extra, extra_len);
831
832 ieee80211_tx_skb(sdata, skb, encrypt);
833 }
834
835 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
836 const u8 *ie, size_t ie_len)
837 {
838 struct ieee80211_supported_band *sband;
839 u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
840 int i;
841
842 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
843
844 pos = buffer;
845
846 *pos++ = WLAN_EID_SUPP_RATES;
847 supp_rates_len = pos;
848 *pos++ = 0;
849
850 for (i = 0; i < sband->n_bitrates; i++) {
851 struct ieee80211_rate *rate = &sband->bitrates[i];
852
853 if (esupp_rates_len) {
854 *esupp_rates_len += 1;
855 } else if (*supp_rates_len == 8) {
856 *pos++ = WLAN_EID_EXT_SUPP_RATES;
857 esupp_rates_len = pos;
858 *pos++ = 1;
859 } else
860 *supp_rates_len += 1;
861
862 *pos++ = rate->bitrate / 5;
863 }
864
865 if (sband->ht_cap.ht_supported) {
866 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
867
868 *pos++ = WLAN_EID_HT_CAPABILITY;
869 *pos++ = sizeof(struct ieee80211_ht_cap);
870 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
871 memcpy(pos, &tmp, sizeof(u16));
872 pos += sizeof(u16);
873 /* TODO: needs a define here for << 2 */
874 *pos++ = sband->ht_cap.ampdu_factor |
875 (sband->ht_cap.ampdu_density << 2);
876 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
877 pos += sizeof(sband->ht_cap.mcs);
878 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
879 }
880
881 /*
882 * If adding more here, adjust code in main.c
883 * that calculates local->scan_ies_len.
884 */
885
886 if (ie) {
887 memcpy(pos, ie, ie_len);
888 pos += ie_len;
889 }
890
891 return pos - buffer;
892 }
893
894 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
895 const u8 *ssid, size_t ssid_len,
896 const u8 *ie, size_t ie_len)
897 {
898 struct ieee80211_local *local = sdata->local;
899 struct sk_buff *skb;
900 struct ieee80211_mgmt *mgmt;
901 u8 *pos;
902
903 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
904 ie_len);
905 if (!skb) {
906 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
907 "request\n", sdata->dev->name);
908 return;
909 }
910 skb_reserve(skb, local->hw.extra_tx_headroom);
911
912 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
913 memset(mgmt, 0, 24);
914 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
915 IEEE80211_STYPE_PROBE_REQ);
916 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
917 if (dst) {
918 memcpy(mgmt->da, dst, ETH_ALEN);
919 memcpy(mgmt->bssid, dst, ETH_ALEN);
920 } else {
921 memset(mgmt->da, 0xff, ETH_ALEN);
922 memset(mgmt->bssid, 0xff, ETH_ALEN);
923 }
924 pos = skb_put(skb, 2 + ssid_len);
925 *pos++ = WLAN_EID_SSID;
926 *pos++ = ssid_len;
927 memcpy(pos, ssid, ssid_len);
928 pos += ssid_len;
929
930 skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
931
932 ieee80211_tx_skb(sdata, skb, 0);
933 }
934
935 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
936 struct ieee802_11_elems *elems,
937 enum ieee80211_band band)
938 {
939 struct ieee80211_supported_band *sband;
940 struct ieee80211_rate *bitrates;
941 size_t num_rates;
942 u32 supp_rates;
943 int i, j;
944 sband = local->hw.wiphy->bands[band];
945
946 if (!sband) {
947 WARN_ON(1);
948 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
949 }
950
951 bitrates = sband->bitrates;
952 num_rates = sband->n_bitrates;
953 supp_rates = 0;
954 for (i = 0; i < elems->supp_rates_len +
955 elems->ext_supp_rates_len; i++) {
956 u8 rate = 0;
957 int own_rate;
958 if (i < elems->supp_rates_len)
959 rate = elems->supp_rates[i];
960 else if (elems->ext_supp_rates)
961 rate = elems->ext_supp_rates
962 [i - elems->supp_rates_len];
963 own_rate = 5 * (rate & 0x7f);
964 for (j = 0; j < num_rates; j++)
965 if (bitrates[j].bitrate == own_rate)
966 supp_rates |= BIT(j);
967 }
968 return supp_rates;
969 }
970
971 int ieee80211_reconfig(struct ieee80211_local *local)
972 {
973 struct ieee80211_hw *hw = &local->hw;
974 struct ieee80211_sub_if_data *sdata;
975 struct ieee80211_if_init_conf conf;
976 struct sta_info *sta;
977 unsigned long flags;
978 int res;
979
980 /* restart hardware */
981 if (local->open_count) {
982 res = local->ops->start(hw);
983
984 ieee80211_led_radio(local, hw->conf.radio_enabled);
985 }
986
987 /* add interfaces */
988 list_for_each_entry(sdata, &local->interfaces, list) {
989 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
990 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
991 netif_running(sdata->dev)) {
992 conf.vif = &sdata->vif;
993 conf.type = sdata->vif.type;
994 conf.mac_addr = sdata->dev->dev_addr;
995 res = local->ops->add_interface(hw, &conf);
996 }
997 }
998
999 /* add STAs back */
1000 if (local->ops->sta_notify) {
1001 spin_lock_irqsave(&local->sta_lock, flags);
1002 list_for_each_entry(sta, &local->sta_list, list) {
1003 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1004 sdata = container_of(sdata->bss,
1005 struct ieee80211_sub_if_data,
1006 u.ap);
1007
1008 local->ops->sta_notify(hw, &sdata->vif,
1009 STA_NOTIFY_ADD, &sta->sta);
1010 }
1011 spin_unlock_irqrestore(&local->sta_lock, flags);
1012 }
1013
1014 /* Clear Suspend state so that ADDBA requests can be processed */
1015
1016 rcu_read_lock();
1017
1018 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1019 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1020 clear_sta_flags(sta, WLAN_STA_SUSPEND);
1021 }
1022 }
1023
1024 rcu_read_unlock();
1025
1026 /* setup RTS threshold */
1027 if (local->ops->set_rts_threshold)
1028 local->ops->set_rts_threshold(hw, local->rts_threshold);
1029
1030 /* reconfigure hardware */
1031 ieee80211_hw_config(local, ~0);
1032
1033 netif_addr_lock_bh(local->mdev);
1034 ieee80211_configure_filter(local);
1035 netif_addr_unlock_bh(local->mdev);
1036
1037 /* Finally also reconfigure all the BSS information */
1038 list_for_each_entry(sdata, &local->interfaces, list) {
1039 u32 changed = ~0;
1040 if (!netif_running(sdata->dev))
1041 continue;
1042 switch (sdata->vif.type) {
1043 case NL80211_IFTYPE_STATION:
1044 /* disable beacon change bits */
1045 changed &= ~IEEE80211_IFCC_BEACON;
1046 /* fall through */
1047 case NL80211_IFTYPE_ADHOC:
1048 case NL80211_IFTYPE_AP:
1049 case NL80211_IFTYPE_MESH_POINT:
1050 /*
1051 * Driver's config_interface can fail if rfkill is
1052 * enabled. Accommodate this return code.
1053 * FIXME: When mac80211 has knowledge of rfkill
1054 * state the code below can change back to:
1055 * WARN(ieee80211_if_config(sdata, changed));
1056 * ieee80211_bss_info_change_notify(sdata, ~0);
1057 */
1058 if (ieee80211_if_config(sdata, changed))
1059 printk(KERN_DEBUG "%s: failed to configure interface during resume\n",
1060 sdata->dev->name);
1061 else
1062 ieee80211_bss_info_change_notify(sdata, ~0);
1063 break;
1064 case NL80211_IFTYPE_WDS:
1065 break;
1066 case NL80211_IFTYPE_AP_VLAN:
1067 case NL80211_IFTYPE_MONITOR:
1068 /* ignore virtual */
1069 break;
1070 case NL80211_IFTYPE_UNSPECIFIED:
1071 case __NL80211_IFTYPE_AFTER_LAST:
1072 WARN_ON(1);
1073 break;
1074 }
1075 }
1076
1077 /* add back keys */
1078 list_for_each_entry(sdata, &local->interfaces, list)
1079 if (netif_running(sdata->dev))
1080 ieee80211_enable_keys(sdata);
1081
1082 ieee80211_wake_queues_by_reason(hw,
1083 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1084
1085 return 0;
1086 }
Linux kernel - Deliverables
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