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[mirror_ubuntu-jammy-kernel.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 <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
35 /* privid for wiphys to determine whether they belong to us or not */
36 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
37
38 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
39 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
40 const unsigned char rfc1042_header[] __aligned(2) =
41 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
42
43 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
44 const unsigned char bridge_tunnel_header[] __aligned(2) =
45 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
46
47 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
48 {
49 struct ieee80211_local *local;
50 BUG_ON(!wiphy);
51
52 local = wiphy_priv(wiphy);
53 return &local->hw;
54 }
55 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
56
57 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
58 enum nl80211_iftype type)
59 {
60 __le16 fc = hdr->frame_control;
61
62 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
63 if (len < 16)
64 return NULL;
65
66 if (ieee80211_is_data(fc)) {
67 if (len < 24) /* drop incorrect hdr len (data) */
68 return NULL;
69
70 if (ieee80211_has_a4(fc))
71 return NULL;
72 if (ieee80211_has_tods(fc))
73 return hdr->addr1;
74 if (ieee80211_has_fromds(fc))
75 return hdr->addr2;
76
77 return hdr->addr3;
78 }
79
80 if (ieee80211_is_mgmt(fc)) {
81 if (len < 24) /* drop incorrect hdr len (mgmt) */
82 return NULL;
83 return hdr->addr3;
84 }
85
86 if (ieee80211_is_ctl(fc)) {
87 if(ieee80211_is_pspoll(fc))
88 return hdr->addr1;
89
90 if (ieee80211_is_back_req(fc)) {
91 switch (type) {
92 case NL80211_IFTYPE_STATION:
93 return hdr->addr2;
94 case NL80211_IFTYPE_AP:
95 case NL80211_IFTYPE_AP_VLAN:
96 return hdr->addr1;
97 default:
98 break; /* fall through to the return */
99 }
100 }
101 }
102
103 return NULL;
104 }
105
106 unsigned int ieee80211_hdrlen(__le16 fc)
107 {
108 unsigned int hdrlen = 24;
109
110 if (ieee80211_is_data(fc)) {
111 if (ieee80211_has_a4(fc))
112 hdrlen = 30;
113 if (ieee80211_is_data_qos(fc))
114 hdrlen += IEEE80211_QOS_CTL_LEN;
115 goto out;
116 }
117
118 if (ieee80211_is_ctl(fc)) {
119 /*
120 * ACK and CTS are 10 bytes, all others 16. To see how
121 * to get this condition consider
122 * subtype mask: 0b0000000011110000 (0x00F0)
123 * ACK subtype: 0b0000000011010000 (0x00D0)
124 * CTS subtype: 0b0000000011000000 (0x00C0)
125 * bits that matter: ^^^ (0x00E0)
126 * value of those: 0b0000000011000000 (0x00C0)
127 */
128 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
129 hdrlen = 10;
130 else
131 hdrlen = 16;
132 }
133 out:
134 return hdrlen;
135 }
136 EXPORT_SYMBOL(ieee80211_hdrlen);
137
138 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
139 {
140 const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
141 unsigned int hdrlen;
142
143 if (unlikely(skb->len < 10))
144 return 0;
145 hdrlen = ieee80211_hdrlen(hdr->frame_control);
146 if (unlikely(hdrlen > skb->len))
147 return 0;
148 return hdrlen;
149 }
150 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
151
152 int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
153 {
154 int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
155 /* 7.1.3.5a.2 */
156 switch (ae) {
157 case 0:
158 return 6;
159 case 1:
160 return 12;
161 case 2:
162 return 18;
163 case 3:
164 return 24;
165 default:
166 return 6;
167 }
168 }
169
170 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
171 {
172 struct sk_buff *skb = tx->skb;
173 struct ieee80211_hdr *hdr;
174
175 do {
176 hdr = (struct ieee80211_hdr *) skb->data;
177 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
178 } while ((skb = skb->next));
179 }
180
181 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
182 int rate, int erp, int short_preamble)
183 {
184 int dur;
185
186 /* calculate duration (in microseconds, rounded up to next higher
187 * integer if it includes a fractional microsecond) to send frame of
188 * len bytes (does not include FCS) at the given rate. Duration will
189 * also include SIFS.
190 *
191 * rate is in 100 kbps, so divident is multiplied by 10 in the
192 * DIV_ROUND_UP() operations.
193 */
194
195 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
196 /*
197 * OFDM:
198 *
199 * N_DBPS = DATARATE x 4
200 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
201 * (16 = SIGNAL time, 6 = tail bits)
202 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
203 *
204 * T_SYM = 4 usec
205 * 802.11a - 17.5.2: aSIFSTime = 16 usec
206 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
207 * signal ext = 6 usec
208 */
209 dur = 16; /* SIFS + signal ext */
210 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
211 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
212 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
213 4 * rate); /* T_SYM x N_SYM */
214 } else {
215 /*
216 * 802.11b or 802.11g with 802.11b compatibility:
217 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
218 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
219 *
220 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
221 * aSIFSTime = 10 usec
222 * aPreambleLength = 144 usec or 72 usec with short preamble
223 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
224 */
225 dur = 10; /* aSIFSTime = 10 usec */
226 dur += short_preamble ? (72 + 24) : (144 + 48);
227
228 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
229 }
230
231 return dur;
232 }
233
234 /* Exported duration function for driver use */
235 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
236 struct ieee80211_vif *vif,
237 size_t frame_len,
238 struct ieee80211_rate *rate)
239 {
240 struct ieee80211_local *local = hw_to_local(hw);
241 struct ieee80211_sub_if_data *sdata;
242 u16 dur;
243 int erp;
244 bool short_preamble = false;
245
246 erp = 0;
247 if (vif) {
248 sdata = vif_to_sdata(vif);
249 short_preamble = sdata->vif.bss_conf.use_short_preamble;
250 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
251 erp = rate->flags & IEEE80211_RATE_ERP_G;
252 }
253
254 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
255 short_preamble);
256
257 return cpu_to_le16(dur);
258 }
259 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
260
261 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
262 struct ieee80211_vif *vif, size_t frame_len,
263 const struct ieee80211_tx_info *frame_txctl)
264 {
265 struct ieee80211_local *local = hw_to_local(hw);
266 struct ieee80211_rate *rate;
267 struct ieee80211_sub_if_data *sdata;
268 bool short_preamble;
269 int erp;
270 u16 dur;
271 struct ieee80211_supported_band *sband;
272
273 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
274
275 short_preamble = false;
276
277 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
278
279 erp = 0;
280 if (vif) {
281 sdata = vif_to_sdata(vif);
282 short_preamble = sdata->vif.bss_conf.use_short_preamble;
283 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
284 erp = rate->flags & IEEE80211_RATE_ERP_G;
285 }
286
287 /* CTS duration */
288 dur = ieee80211_frame_duration(local, 10, rate->bitrate,
289 erp, short_preamble);
290 /* Data frame duration */
291 dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
292 erp, short_preamble);
293 /* ACK duration */
294 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
295 erp, short_preamble);
296
297 return cpu_to_le16(dur);
298 }
299 EXPORT_SYMBOL(ieee80211_rts_duration);
300
301 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
302 struct ieee80211_vif *vif,
303 size_t frame_len,
304 const struct ieee80211_tx_info *frame_txctl)
305 {
306 struct ieee80211_local *local = hw_to_local(hw);
307 struct ieee80211_rate *rate;
308 struct ieee80211_sub_if_data *sdata;
309 bool short_preamble;
310 int erp;
311 u16 dur;
312 struct ieee80211_supported_band *sband;
313
314 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
315
316 short_preamble = false;
317
318 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
319 erp = 0;
320 if (vif) {
321 sdata = vif_to_sdata(vif);
322 short_preamble = sdata->vif.bss_conf.use_short_preamble;
323 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
324 erp = rate->flags & IEEE80211_RATE_ERP_G;
325 }
326
327 /* Data frame duration */
328 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
329 erp, short_preamble);
330 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
331 /* ACK duration */
332 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
333 erp, short_preamble);
334 }
335
336 return cpu_to_le16(dur);
337 }
338 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
339
340 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
341 enum queue_stop_reason reason)
342 {
343 struct ieee80211_local *local = hw_to_local(hw);
344
345 if (WARN_ON(queue >= hw->queues))
346 return;
347
348 __clear_bit(reason, &local->queue_stop_reasons[queue]);
349
350 if (!skb_queue_empty(&local->pending[queue]) &&
351 local->queue_stop_reasons[queue] ==
352 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
353 tasklet_schedule(&local->tx_pending_tasklet);
354
355 if (local->queue_stop_reasons[queue] != 0)
356 /* someone still has this queue stopped */
357 return;
358
359 netif_wake_subqueue(local->mdev, queue);
360 }
361
362 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
363 enum queue_stop_reason reason)
364 {
365 struct ieee80211_local *local = hw_to_local(hw);
366 unsigned long flags;
367
368 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
369 __ieee80211_wake_queue(hw, queue, reason);
370 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
371 }
372
373 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
374 {
375 ieee80211_wake_queue_by_reason(hw, queue,
376 IEEE80211_QUEUE_STOP_REASON_DRIVER);
377 }
378 EXPORT_SYMBOL(ieee80211_wake_queue);
379
380 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
381 enum queue_stop_reason reason)
382 {
383 struct ieee80211_local *local = hw_to_local(hw);
384
385 if (WARN_ON(queue >= hw->queues))
386 return;
387
388 /*
389 * Only stop if it was previously running, this is necessary
390 * for correct pending packets handling because there we may
391 * start (but not wake) the queue and rely on that.
392 */
393 if (!local->queue_stop_reasons[queue])
394 netif_stop_subqueue(local->mdev, queue);
395
396 __set_bit(reason, &local->queue_stop_reasons[queue]);
397 }
398
399 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
400 enum queue_stop_reason reason)
401 {
402 struct ieee80211_local *local = hw_to_local(hw);
403 unsigned long flags;
404
405 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
406 __ieee80211_stop_queue(hw, queue, reason);
407 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
408 }
409
410 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
411 {
412 ieee80211_stop_queue_by_reason(hw, queue,
413 IEEE80211_QUEUE_STOP_REASON_DRIVER);
414 }
415 EXPORT_SYMBOL(ieee80211_stop_queue);
416
417 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
418 enum queue_stop_reason reason)
419 {
420 struct ieee80211_local *local = hw_to_local(hw);
421 unsigned long flags;
422 int i;
423
424 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
425
426 for (i = 0; i < hw->queues; i++)
427 __ieee80211_stop_queue(hw, i, reason);
428
429 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
430 }
431
432 void ieee80211_stop_queues(struct ieee80211_hw *hw)
433 {
434 ieee80211_stop_queues_by_reason(hw,
435 IEEE80211_QUEUE_STOP_REASON_DRIVER);
436 }
437 EXPORT_SYMBOL(ieee80211_stop_queues);
438
439 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
440 {
441 struct ieee80211_local *local = hw_to_local(hw);
442
443 if (WARN_ON(queue >= hw->queues))
444 return true;
445
446 return __netif_subqueue_stopped(local->mdev, queue);
447 }
448 EXPORT_SYMBOL(ieee80211_queue_stopped);
449
450 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
451 enum queue_stop_reason reason)
452 {
453 struct ieee80211_local *local = hw_to_local(hw);
454 unsigned long flags;
455 int i;
456
457 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
458
459 for (i = 0; i < hw->queues; i++)
460 __ieee80211_wake_queue(hw, i, reason);
461
462 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
463 }
464
465 void ieee80211_wake_queues(struct ieee80211_hw *hw)
466 {
467 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
468 }
469 EXPORT_SYMBOL(ieee80211_wake_queues);
470
471 void ieee80211_iterate_active_interfaces(
472 struct ieee80211_hw *hw,
473 void (*iterator)(void *data, u8 *mac,
474 struct ieee80211_vif *vif),
475 void *data)
476 {
477 struct ieee80211_local *local = hw_to_local(hw);
478 struct ieee80211_sub_if_data *sdata;
479
480 mutex_lock(&local->iflist_mtx);
481
482 list_for_each_entry(sdata, &local->interfaces, list) {
483 switch (sdata->vif.type) {
484 case __NL80211_IFTYPE_AFTER_LAST:
485 case NL80211_IFTYPE_UNSPECIFIED:
486 case NL80211_IFTYPE_MONITOR:
487 case NL80211_IFTYPE_AP_VLAN:
488 continue;
489 case NL80211_IFTYPE_AP:
490 case NL80211_IFTYPE_STATION:
491 case NL80211_IFTYPE_ADHOC:
492 case NL80211_IFTYPE_WDS:
493 case NL80211_IFTYPE_MESH_POINT:
494 break;
495 }
496 if (netif_running(sdata->dev))
497 iterator(data, sdata->dev->dev_addr,
498 &sdata->vif);
499 }
500
501 mutex_unlock(&local->iflist_mtx);
502 }
503 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
504
505 void ieee80211_iterate_active_interfaces_atomic(
506 struct ieee80211_hw *hw,
507 void (*iterator)(void *data, u8 *mac,
508 struct ieee80211_vif *vif),
509 void *data)
510 {
511 struct ieee80211_local *local = hw_to_local(hw);
512 struct ieee80211_sub_if_data *sdata;
513
514 rcu_read_lock();
515
516 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
517 switch (sdata->vif.type) {
518 case __NL80211_IFTYPE_AFTER_LAST:
519 case NL80211_IFTYPE_UNSPECIFIED:
520 case NL80211_IFTYPE_MONITOR:
521 case NL80211_IFTYPE_AP_VLAN:
522 continue;
523 case NL80211_IFTYPE_AP:
524 case NL80211_IFTYPE_STATION:
525 case NL80211_IFTYPE_ADHOC:
526 case NL80211_IFTYPE_WDS:
527 case NL80211_IFTYPE_MESH_POINT:
528 break;
529 }
530 if (netif_running(sdata->dev))
531 iterator(data, sdata->dev->dev_addr,
532 &sdata->vif);
533 }
534
535 rcu_read_unlock();
536 }
537 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
538
539 void ieee802_11_parse_elems(u8 *start, size_t len,
540 struct ieee802_11_elems *elems)
541 {
542 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
543 }
544
545 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
546 struct ieee802_11_elems *elems,
547 u64 filter, u32 crc)
548 {
549 size_t left = len;
550 u8 *pos = start;
551 bool calc_crc = filter != 0;
552
553 memset(elems, 0, sizeof(*elems));
554 elems->ie_start = start;
555 elems->total_len = len;
556
557 while (left >= 2) {
558 u8 id, elen;
559
560 id = *pos++;
561 elen = *pos++;
562 left -= 2;
563
564 if (elen > left)
565 break;
566
567 if (calc_crc && id < 64 && (filter & BIT(id)))
568 crc = crc32_be(crc, pos - 2, elen + 2);
569
570 switch (id) {
571 case WLAN_EID_SSID:
572 elems->ssid = pos;
573 elems->ssid_len = elen;
574 break;
575 case WLAN_EID_SUPP_RATES:
576 elems->supp_rates = pos;
577 elems->supp_rates_len = elen;
578 break;
579 case WLAN_EID_FH_PARAMS:
580 elems->fh_params = pos;
581 elems->fh_params_len = elen;
582 break;
583 case WLAN_EID_DS_PARAMS:
584 elems->ds_params = pos;
585 elems->ds_params_len = elen;
586 break;
587 case WLAN_EID_CF_PARAMS:
588 elems->cf_params = pos;
589 elems->cf_params_len = elen;
590 break;
591 case WLAN_EID_TIM:
592 if (elen >= sizeof(struct ieee80211_tim_ie)) {
593 elems->tim = (void *)pos;
594 elems->tim_len = elen;
595 }
596 break;
597 case WLAN_EID_IBSS_PARAMS:
598 elems->ibss_params = pos;
599 elems->ibss_params_len = elen;
600 break;
601 case WLAN_EID_CHALLENGE:
602 elems->challenge = pos;
603 elems->challenge_len = elen;
604 break;
605 case WLAN_EID_VENDOR_SPECIFIC:
606 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
607 pos[2] == 0xf2) {
608 /* Microsoft OUI (00:50:F2) */
609
610 if (calc_crc)
611 crc = crc32_be(crc, pos - 2, elen + 2);
612
613 if (pos[3] == 1) {
614 /* OUI Type 1 - WPA IE */
615 elems->wpa = pos;
616 elems->wpa_len = elen;
617 } else if (elen >= 5 && pos[3] == 2) {
618 /* OUI Type 2 - WMM IE */
619 if (pos[4] == 0) {
620 elems->wmm_info = pos;
621 elems->wmm_info_len = elen;
622 } else if (pos[4] == 1) {
623 elems->wmm_param = pos;
624 elems->wmm_param_len = elen;
625 }
626 }
627 }
628 break;
629 case WLAN_EID_RSN:
630 elems->rsn = pos;
631 elems->rsn_len = elen;
632 break;
633 case WLAN_EID_ERP_INFO:
634 elems->erp_info = pos;
635 elems->erp_info_len = elen;
636 break;
637 case WLAN_EID_EXT_SUPP_RATES:
638 elems->ext_supp_rates = pos;
639 elems->ext_supp_rates_len = elen;
640 break;
641 case WLAN_EID_HT_CAPABILITY:
642 if (elen >= sizeof(struct ieee80211_ht_cap))
643 elems->ht_cap_elem = (void *)pos;
644 break;
645 case WLAN_EID_HT_INFORMATION:
646 if (elen >= sizeof(struct ieee80211_ht_info))
647 elems->ht_info_elem = (void *)pos;
648 break;
649 case WLAN_EID_MESH_ID:
650 elems->mesh_id = pos;
651 elems->mesh_id_len = elen;
652 break;
653 case WLAN_EID_MESH_CONFIG:
654 elems->mesh_config = pos;
655 elems->mesh_config_len = elen;
656 break;
657 case WLAN_EID_PEER_LINK:
658 elems->peer_link = pos;
659 elems->peer_link_len = elen;
660 break;
661 case WLAN_EID_PREQ:
662 elems->preq = pos;
663 elems->preq_len = elen;
664 break;
665 case WLAN_EID_PREP:
666 elems->prep = pos;
667 elems->prep_len = elen;
668 break;
669 case WLAN_EID_PERR:
670 elems->perr = pos;
671 elems->perr_len = elen;
672 break;
673 case WLAN_EID_CHANNEL_SWITCH:
674 elems->ch_switch_elem = pos;
675 elems->ch_switch_elem_len = elen;
676 break;
677 case WLAN_EID_QUIET:
678 if (!elems->quiet_elem) {
679 elems->quiet_elem = pos;
680 elems->quiet_elem_len = elen;
681 }
682 elems->num_of_quiet_elem++;
683 break;
684 case WLAN_EID_COUNTRY:
685 elems->country_elem = pos;
686 elems->country_elem_len = elen;
687 break;
688 case WLAN_EID_PWR_CONSTRAINT:
689 elems->pwr_constr_elem = pos;
690 elems->pwr_constr_elem_len = elen;
691 break;
692 case WLAN_EID_TIMEOUT_INTERVAL:
693 elems->timeout_int = pos;
694 elems->timeout_int_len = elen;
695 break;
696 default:
697 break;
698 }
699
700 left -= elen;
701 pos += elen;
702 }
703
704 return crc;
705 }
706
707 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
708 {
709 struct ieee80211_local *local = sdata->local;
710 struct ieee80211_tx_queue_params qparam;
711 int i;
712
713 if (!local->ops->conf_tx)
714 return;
715
716 memset(&qparam, 0, sizeof(qparam));
717
718 qparam.aifs = 2;
719
720 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
721 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
722 qparam.cw_min = 31;
723 else
724 qparam.cw_min = 15;
725
726 qparam.cw_max = 1023;
727 qparam.txop = 0;
728
729 for (i = 0; i < local_to_hw(local)->queues; i++)
730 drv_conf_tx(local, i, &qparam);
731 }
732
733 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
734 const size_t supp_rates_len,
735 const u8 *supp_rates)
736 {
737 struct ieee80211_local *local = sdata->local;
738 int i, have_higher_than_11mbit = 0;
739
740 /* cf. IEEE 802.11 9.2.12 */
741 for (i = 0; i < supp_rates_len; i++)
742 if ((supp_rates[i] & 0x7f) * 5 > 110)
743 have_higher_than_11mbit = 1;
744
745 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
746 have_higher_than_11mbit)
747 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
748 else
749 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
750
751 ieee80211_set_wmm_default(sdata);
752 }
753
754 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
755 int encrypt)
756 {
757 skb->dev = sdata->local->mdev;
758 skb_set_mac_header(skb, 0);
759 skb_set_network_header(skb, 0);
760 skb_set_transport_header(skb, 0);
761
762 skb->iif = sdata->dev->ifindex;
763 skb->do_not_encrypt = !encrypt;
764
765 dev_queue_xmit(skb);
766 }
767
768 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
769 {
770 int ret = -EINVAL;
771 struct ieee80211_channel *chan;
772 struct ieee80211_local *local = sdata->local;
773
774 chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
775
776 if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
777 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
778 chan->flags & IEEE80211_CHAN_NO_IBSS)
779 return ret;
780 local->oper_channel = chan;
781 local->oper_channel_type = NL80211_CHAN_NO_HT;
782
783 if (local->sw_scanning || local->hw_scanning)
784 ret = 0;
785 else
786 ret = ieee80211_hw_config(
787 local, IEEE80211_CONF_CHANGE_CHANNEL);
788 }
789
790 return ret;
791 }
792
793 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
794 enum ieee80211_band band)
795 {
796 struct ieee80211_supported_band *sband;
797 struct ieee80211_rate *bitrates;
798 u32 mandatory_rates;
799 enum ieee80211_rate_flags mandatory_flag;
800 int i;
801
802 sband = local->hw.wiphy->bands[band];
803 if (!sband) {
804 WARN_ON(1);
805 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
806 }
807
808 if (band == IEEE80211_BAND_2GHZ)
809 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
810 else
811 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
812
813 bitrates = sband->bitrates;
814 mandatory_rates = 0;
815 for (i = 0; i < sband->n_bitrates; i++)
816 if (bitrates[i].flags & mandatory_flag)
817 mandatory_rates |= BIT(i);
818 return mandatory_rates;
819 }
820
821 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
822 u16 transaction, u16 auth_alg,
823 u8 *extra, size_t extra_len,
824 const u8 *bssid, int encrypt)
825 {
826 struct ieee80211_local *local = sdata->local;
827 struct sk_buff *skb;
828 struct ieee80211_mgmt *mgmt;
829
830 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
831 sizeof(*mgmt) + 6 + extra_len);
832 if (!skb) {
833 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
834 "frame\n", sdata->dev->name);
835 return;
836 }
837 skb_reserve(skb, local->hw.extra_tx_headroom);
838
839 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
840 memset(mgmt, 0, 24 + 6);
841 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
842 IEEE80211_STYPE_AUTH);
843 if (encrypt)
844 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
845 memcpy(mgmt->da, bssid, ETH_ALEN);
846 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
847 memcpy(mgmt->bssid, bssid, ETH_ALEN);
848 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
849 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
850 mgmt->u.auth.status_code = cpu_to_le16(0);
851 if (extra)
852 memcpy(skb_put(skb, extra_len), extra, extra_len);
853
854 ieee80211_tx_skb(sdata, skb, encrypt);
855 }
856
857 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
858 const u8 *ie, size_t ie_len)
859 {
860 struct ieee80211_supported_band *sband;
861 u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
862 int i;
863
864 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
865
866 pos = buffer;
867
868 *pos++ = WLAN_EID_SUPP_RATES;
869 supp_rates_len = pos;
870 *pos++ = 0;
871
872 for (i = 0; i < sband->n_bitrates; i++) {
873 struct ieee80211_rate *rate = &sband->bitrates[i];
874
875 if (esupp_rates_len) {
876 *esupp_rates_len += 1;
877 } else if (*supp_rates_len == 8) {
878 *pos++ = WLAN_EID_EXT_SUPP_RATES;
879 esupp_rates_len = pos;
880 *pos++ = 1;
881 } else
882 *supp_rates_len += 1;
883
884 *pos++ = rate->bitrate / 5;
885 }
886
887 if (sband->ht_cap.ht_supported) {
888 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
889
890 *pos++ = WLAN_EID_HT_CAPABILITY;
891 *pos++ = sizeof(struct ieee80211_ht_cap);
892 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
893 memcpy(pos, &tmp, sizeof(u16));
894 pos += sizeof(u16);
895 /* TODO: needs a define here for << 2 */
896 *pos++ = sband->ht_cap.ampdu_factor |
897 (sband->ht_cap.ampdu_density << 2);
898 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
899 pos += sizeof(sband->ht_cap.mcs);
900 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
901 }
902
903 /*
904 * If adding more here, adjust code in main.c
905 * that calculates local->scan_ies_len.
906 */
907
908 if (ie) {
909 memcpy(pos, ie, ie_len);
910 pos += ie_len;
911 }
912
913 return pos - buffer;
914 }
915
916 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
917 const u8 *ssid, size_t ssid_len,
918 const u8 *ie, size_t ie_len)
919 {
920 struct ieee80211_local *local = sdata->local;
921 struct sk_buff *skb;
922 struct ieee80211_mgmt *mgmt;
923 u8 *pos;
924
925 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
926 ie_len);
927 if (!skb) {
928 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
929 "request\n", sdata->dev->name);
930 return;
931 }
932 skb_reserve(skb, local->hw.extra_tx_headroom);
933
934 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
935 memset(mgmt, 0, 24);
936 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
937 IEEE80211_STYPE_PROBE_REQ);
938 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
939 if (dst) {
940 memcpy(mgmt->da, dst, ETH_ALEN);
941 memcpy(mgmt->bssid, dst, ETH_ALEN);
942 } else {
943 memset(mgmt->da, 0xff, ETH_ALEN);
944 memset(mgmt->bssid, 0xff, ETH_ALEN);
945 }
946 pos = skb_put(skb, 2 + ssid_len);
947 *pos++ = WLAN_EID_SSID;
948 *pos++ = ssid_len;
949 memcpy(pos, ssid, ssid_len);
950 pos += ssid_len;
951
952 skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
953
954 ieee80211_tx_skb(sdata, skb, 0);
955 }
956
957 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
958 struct ieee802_11_elems *elems,
959 enum ieee80211_band band)
960 {
961 struct ieee80211_supported_band *sband;
962 struct ieee80211_rate *bitrates;
963 size_t num_rates;
964 u32 supp_rates;
965 int i, j;
966 sband = local->hw.wiphy->bands[band];
967
968 if (!sband) {
969 WARN_ON(1);
970 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
971 }
972
973 bitrates = sband->bitrates;
974 num_rates = sband->n_bitrates;
975 supp_rates = 0;
976 for (i = 0; i < elems->supp_rates_len +
977 elems->ext_supp_rates_len; i++) {
978 u8 rate = 0;
979 int own_rate;
980 if (i < elems->supp_rates_len)
981 rate = elems->supp_rates[i];
982 else if (elems->ext_supp_rates)
983 rate = elems->ext_supp_rates
984 [i - elems->supp_rates_len];
985 own_rate = 5 * (rate & 0x7f);
986 for (j = 0; j < num_rates; j++)
987 if (bitrates[j].bitrate == own_rate)
988 supp_rates |= BIT(j);
989 }
990 return supp_rates;
991 }
992
993 int ieee80211_reconfig(struct ieee80211_local *local)
994 {
995 struct ieee80211_hw *hw = &local->hw;
996 struct ieee80211_sub_if_data *sdata;
997 struct ieee80211_if_init_conf conf;
998 struct sta_info *sta;
999 unsigned long flags;
1000 int res;
1001
1002 /* restart hardware */
1003 if (local->open_count) {
1004 res = drv_start(local);
1005
1006 ieee80211_led_radio(local, hw->conf.radio_enabled);
1007 }
1008
1009 /* add interfaces */
1010 list_for_each_entry(sdata, &local->interfaces, list) {
1011 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1012 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1013 netif_running(sdata->dev)) {
1014 conf.vif = &sdata->vif;
1015 conf.type = sdata->vif.type;
1016 conf.mac_addr = sdata->dev->dev_addr;
1017 res = drv_add_interface(local, &conf);
1018 }
1019 }
1020
1021 /* add STAs back */
1022 if (local->ops->sta_notify) {
1023 spin_lock_irqsave(&local->sta_lock, flags);
1024 list_for_each_entry(sta, &local->sta_list, list) {
1025 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1026 sdata = container_of(sdata->bss,
1027 struct ieee80211_sub_if_data,
1028 u.ap);
1029
1030 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD,
1031 &sta->sta);
1032 }
1033 spin_unlock_irqrestore(&local->sta_lock, flags);
1034 }
1035
1036 /* Clear Suspend state so that ADDBA requests can be processed */
1037
1038 rcu_read_lock();
1039
1040 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1041 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1042 clear_sta_flags(sta, WLAN_STA_SUSPEND);
1043 }
1044 }
1045
1046 rcu_read_unlock();
1047
1048 /* setup RTS threshold */
1049 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1050
1051 /* reconfigure hardware */
1052 ieee80211_hw_config(local, ~0);
1053
1054 netif_addr_lock_bh(local->mdev);
1055 ieee80211_configure_filter(local);
1056 netif_addr_unlock_bh(local->mdev);
1057
1058 /* Finally also reconfigure all the BSS information */
1059 list_for_each_entry(sdata, &local->interfaces, list) {
1060 u32 changed = ~0;
1061 if (!netif_running(sdata->dev))
1062 continue;
1063 switch (sdata->vif.type) {
1064 case NL80211_IFTYPE_STATION:
1065 /* disable beacon change bits */
1066 changed &= ~(BSS_CHANGED_BEACON |
1067 BSS_CHANGED_BEACON_ENABLED);
1068 /* fall through */
1069 case NL80211_IFTYPE_ADHOC:
1070 case NL80211_IFTYPE_AP:
1071 case NL80211_IFTYPE_MESH_POINT:
1072 ieee80211_bss_info_change_notify(sdata, changed);
1073 break;
1074 case NL80211_IFTYPE_WDS:
1075 break;
1076 case NL80211_IFTYPE_AP_VLAN:
1077 case NL80211_IFTYPE_MONITOR:
1078 /* ignore virtual */
1079 break;
1080 case NL80211_IFTYPE_UNSPECIFIED:
1081 case __NL80211_IFTYPE_AFTER_LAST:
1082 WARN_ON(1);
1083 break;
1084 }
1085 }
1086
1087 /* add back keys */
1088 list_for_each_entry(sdata, &local->interfaces, list)
1089 if (netif_running(sdata->dev))
1090 ieee80211_enable_keys(sdata);
1091
1092 ieee80211_wake_queues_by_reason(hw,
1093 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1094
1095 return 0;
1096 }
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