]> bbs.cooldavid.org Git - net-next-2.6.git/blame - net/wireless/util.c
git://bbs.cooldavid.org / net-next-2.6.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[net-next-2.6.git] / net / wireless / util.c
CommitLineData
8318d78a
JB		 1/*
2 * Wireless utility functions
3 *
d3236553 4 * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
8318d78a 5 */
d3236553 6#include <linux/bitops.h>
e31a16d6 7#include <linux/etherdevice.h>
5a0e3ad6 8#include <linux/slab.h>
d3236553 9#include <net/cfg80211.h>
e31a16d6 10#include <net/ip.h>
8318d78a
JB		 11#include "core.h"
12
bd815252
JB		 13struct ieee80211_rate *
14ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
881d948c 15 u32 basic_rates, int bitrate)
bd815252
JB		 16{
17 struct ieee80211_rate *result = &sband->bitrates[0];
18 int i;
19
20 for (i = 0; i < sband->n_bitrates; i++) {
21 if (!(basic_rates & BIT(i)))
22 continue;
23 if (sband->bitrates[i].bitrate > bitrate)
24 continue;
25 result = &sband->bitrates[i];
26 }
27
28 return result;
29}
30EXPORT_SYMBOL(ieee80211_get_response_rate);
31
8318d78a
JB		 32int ieee80211_channel_to_frequency(int chan)
33{
34 if (chan < 14)
35 return 2407 + chan * 5;
36
37 if (chan == 14)
38 return 2484;
39
40 /* FIXME: 802.11j 17.3.8.3.2 */
41 return (chan + 1000) * 5;
42}
43EXPORT_SYMBOL(ieee80211_channel_to_frequency);
44
45int ieee80211_frequency_to_channel(int freq)
46{
47 if (freq == 2484)
48 return 14;
49
50 if (freq < 2484)
51 return (freq - 2407) / 5;
52
53 /* FIXME: 802.11j 17.3.8.3.2 */
54 return freq/5 - 1000;
55}
56EXPORT_SYMBOL(ieee80211_frequency_to_channel);
57
6c507cd0
JB		 58struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
59 int freq)
906c730a
JB		 60{
61 enum ieee80211_band band;
62 struct ieee80211_supported_band *sband;
63 int i;
64
65 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
66 sband = wiphy->bands[band];
67
68 if (!sband)
69 continue;
70
71 for (i = 0; i < sband->n_channels; i++) {
72 if (sband->channels[i].center_freq == freq)
73 return &sband->channels[i];
74 }
75 }
76
77 return NULL;
78}
6c507cd0 79EXPORT_SYMBOL(__ieee80211_get_channel);
906c730a 80
8318d78a
JB		 81static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
82 enum ieee80211_band band)
83{
84 int i, want;
85
86 switch (band) {
87 case IEEE80211_BAND_5GHZ:
88 want = 3;
89 for (i = 0; i < sband->n_bitrates; i++) {
90 if (sband->bitrates[i].bitrate == 60 ||
91 sband->bitrates[i].bitrate == 120 ||
92 sband->bitrates[i].bitrate == 240) {
93 sband->bitrates[i].flags |=
94 IEEE80211_RATE_MANDATORY_A;
95 want--;
96 }
97 }
98 WARN_ON(want);
99 break;
100 case IEEE80211_BAND_2GHZ:
101 want = 7;
102 for (i = 0; i < sband->n_bitrates; i++) {
103 if (sband->bitrates[i].bitrate == 10) {
104 sband->bitrates[i].flags |=
105 IEEE80211_RATE_MANDATORY_B |
106 IEEE80211_RATE_MANDATORY_G;
107 want--;
108 }
109
110 if (sband->bitrates[i].bitrate == 20 ||
111 sband->bitrates[i].bitrate == 55 ||
112 sband->bitrates[i].bitrate == 110 ||
113 sband->bitrates[i].bitrate == 60 ||
114 sband->bitrates[i].bitrate == 120 ||
115 sband->bitrates[i].bitrate == 240) {
116 sband->bitrates[i].flags |=
117 IEEE80211_RATE_MANDATORY_G;
118 want--;
119 }
120
aac09fbf
JB		 121 if (sband->bitrates[i].bitrate != 10 &&
122 sband->bitrates[i].bitrate != 20 &&
123 sband->bitrates[i].bitrate != 55 &&
124 sband->bitrates[i].bitrate != 110)
8318d78a
JB		 125 sband->bitrates[i].flags |=
126 IEEE80211_RATE_ERP_G;
127 }
406f2388 128 WARN_ON(want != 0 && want != 3 && want != 6);
8318d78a
JB		 129 break;
130 case IEEE80211_NUM_BANDS:
131 WARN_ON(1);
132 break;
133 }
134}
135
136void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
137{
138 enum ieee80211_band band;
139
140 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
141 if (wiphy->bands[band])
142 set_mandatory_flags_band(wiphy->bands[band], band);
143}
08645126 144
fffd0934
JB		 145int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
146 struct key_params *params, int key_idx,
08645126
JB		 147 const u8 *mac_addr)
148{
fffd0934
JB		 149 int i;
150
08645126
JB		 151 if (key_idx > 5)
152 return -EINVAL;
153
154 /*
155 * Disallow pairwise keys with non-zero index unless it's WEP
156 * (because current deployments use pairwise WEP keys with
157 * non-zero indizes but 802.11i clearly specifies to use zero)
158 */
159 if (mac_addr && key_idx &&
160 params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
161 params->cipher != WLAN_CIPHER_SUITE_WEP104)
162 return -EINVAL;
163
08645126
JB		 164 switch (params->cipher) {
165 case WLAN_CIPHER_SUITE_WEP40:
8fc0fee0 166 if (params->key_len != WLAN_KEY_LEN_WEP40)
08645126
JB		 167 return -EINVAL;
168 break;
169 case WLAN_CIPHER_SUITE_TKIP:
8fc0fee0 170 if (params->key_len != WLAN_KEY_LEN_TKIP)
08645126
JB		 171 return -EINVAL;
172 break;
173 case WLAN_CIPHER_SUITE_CCMP:
8fc0fee0 174 if (params->key_len != WLAN_KEY_LEN_CCMP)
08645126
JB		 175 return -EINVAL;
176 break;
177 case WLAN_CIPHER_SUITE_WEP104:
8fc0fee0 178 if (params->key_len != WLAN_KEY_LEN_WEP104)
08645126
JB		 179 return -EINVAL;
180 break;
181 case WLAN_CIPHER_SUITE_AES_CMAC:
8fc0fee0 182 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
08645126
JB		 183 return -EINVAL;
184 break;
185 default:
186 return -EINVAL;
187 }
188
9f26a952
JM		 189 if (params->seq) {
190 switch (params->cipher) {
191 case WLAN_CIPHER_SUITE_WEP40:
192 case WLAN_CIPHER_SUITE_WEP104:
193 /* These ciphers do not use key sequence */
194 return -EINVAL;
195 case WLAN_CIPHER_SUITE_TKIP:
196 case WLAN_CIPHER_SUITE_CCMP:
197 case WLAN_CIPHER_SUITE_AES_CMAC:
198 if (params->seq_len != 6)
199 return -EINVAL;
200 break;
201 }
202 }
203
fffd0934
JB		 204 for (i = 0; i < rdev->wiphy.n_cipher_suites; i++)
205 if (params->cipher == rdev->wiphy.cipher_suites[i])
206 break;
207 if (i == rdev->wiphy.n_cipher_suites)
208 return -EINVAL;
209
08645126
JB		 210 return 0;
211}
e31a16d6
ZY		 212
213/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
214/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
215const unsigned char rfc1042_header[] __aligned(2) =
216 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
217EXPORT_SYMBOL(rfc1042_header);
218
219/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
220const unsigned char bridge_tunnel_header[] __aligned(2) =
221 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
222EXPORT_SYMBOL(bridge_tunnel_header);
223
224unsigned int ieee80211_hdrlen(__le16 fc)
225{
226 unsigned int hdrlen = 24;
227
228 if (ieee80211_is_data(fc)) {
229 if (ieee80211_has_a4(fc))
230 hdrlen = 30;
d0dd2de0 231 if (ieee80211_is_data_qos(fc)) {
e31a16d6 232 hdrlen += IEEE80211_QOS_CTL_LEN;
d0dd2de0
AT		 233 if (ieee80211_has_order(fc))
234 hdrlen += IEEE80211_HT_CTL_LEN;
235 }
e31a16d6
ZY		 236 goto out;
237 }
238
239 if (ieee80211_is_ctl(fc)) {
240 /*
241 * ACK and CTS are 10 bytes, all others 16. To see how
242 * to get this condition consider
243 * subtype mask: 0b0000000011110000 (0x00F0)
244 * ACK subtype: 0b0000000011010000 (0x00D0)
245 * CTS subtype: 0b0000000011000000 (0x00C0)
246 * bits that matter: ^^^ (0x00E0)
247 * value of those: 0b0000000011000000 (0x00C0)
248 */
249 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
250 hdrlen = 10;
251 else
252 hdrlen = 16;
253 }
254out:
255 return hdrlen;
256}
257EXPORT_SYMBOL(ieee80211_hdrlen);
258
259unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
260{
261 const struct ieee80211_hdr *hdr =
262 (const struct ieee80211_hdr *)skb->data;
263 unsigned int hdrlen;
264
265 if (unlikely(skb->len < 10))
266 return 0;
267 hdrlen = ieee80211_hdrlen(hdr->frame_control);
268 if (unlikely(hdrlen > skb->len))
269 return 0;
270 return hdrlen;
271}
272EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
273
60fd2b67 274static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
e31a16d6
ZY		 275{
276 int ae = meshhdr->flags & MESH_FLAGS_AE;
277 /* 7.1.3.5a.2 */
278 switch (ae) {
279 case 0:
280 return 6;
3c5772a5 281 case MESH_FLAGS_AE_A4:
e31a16d6 282 return 12;
3c5772a5 283 case MESH_FLAGS_AE_A5_A6:
e31a16d6 284 return 18;
3c5772a5 285 case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
e31a16d6
ZY		 286 return 24;
287 default:
288 return 6;
289 }
290}
291
eaf85ca7 292int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
e31a16d6
ZY		 293 enum nl80211_iftype iftype)
294{
295 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
296 u16 hdrlen, ethertype;
297 u8 *payload;
298 u8 dst[ETH_ALEN];
299 u8 src[ETH_ALEN] __aligned(2);
300
301 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
302 return -1;
303
304 hdrlen = ieee80211_hdrlen(hdr->frame_control);
305
306 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
307 * header
308 * IEEE 802.11 address fields:
309 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
310 * 0 0 DA SA BSSID n/a
311 * 0 1 DA BSSID SA n/a
312 * 1 0 BSSID SA DA n/a
313 * 1 1 RA TA DA SA
314 */
315 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
316 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
317
318 switch (hdr->frame_control &
319 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
320 case cpu_to_le16(IEEE80211_FCTL_TODS):
321 if (unlikely(iftype != NL80211_IFTYPE_AP &&
322 iftype != NL80211_IFTYPE_AP_VLAN))
323 return -1;
324 break;
325 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
326 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
f14543ee
FF		 327 iftype != NL80211_IFTYPE_MESH_POINT &&
328 iftype != NL80211_IFTYPE_AP_VLAN &&
329 iftype != NL80211_IFTYPE_STATION))
e31a16d6
ZY		 330 return -1;
331 if (iftype == NL80211_IFTYPE_MESH_POINT) {
332 struct ieee80211s_hdr *meshdr =
333 (struct ieee80211s_hdr *) (skb->data + hdrlen);
334 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
335 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
336 memcpy(dst, meshdr->eaddr1, ETH_ALEN);
337 memcpy(src, meshdr->eaddr2, ETH_ALEN);
338 }
339 }
340 break;
341 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
3c5772a5
JC		 342 if ((iftype != NL80211_IFTYPE_STATION &&
343 iftype != NL80211_IFTYPE_MESH_POINT) ||
e31a16d6
ZY		 344 (is_multicast_ether_addr(dst) &&
345 !compare_ether_addr(src, addr)))
346 return -1;
3c5772a5
JC		 347 if (iftype == NL80211_IFTYPE_MESH_POINT) {
348 struct ieee80211s_hdr *meshdr =
349 (struct ieee80211s_hdr *) (skb->data + hdrlen);
350 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
351 if (meshdr->flags & MESH_FLAGS_AE_A4)
352 memcpy(src, meshdr->eaddr1, ETH_ALEN);
353 }
e31a16d6
ZY		 354 break;
355 case cpu_to_le16(0):
356 if (iftype != NL80211_IFTYPE_ADHOC)
357 return -1;
358 break;
359 }
360
361 if (unlikely(skb->len - hdrlen < 8))
362 return -1;
363
364 payload = skb->data + hdrlen;
365 ethertype = (payload[6] << 8) | payload[7];
366
367 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
368 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
369 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
370 /* remove RFC1042 or Bridge-Tunnel encapsulation and
371 * replace EtherType */
372 skb_pull(skb, hdrlen + 6);
373 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
374 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
375 } else {
376 struct ethhdr *ehdr;
377 __be16 len;
378
379 skb_pull(skb, hdrlen);
380 len = htons(skb->len);
381 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
382 memcpy(ehdr->h_dest, dst, ETH_ALEN);
383 memcpy(ehdr->h_source, src, ETH_ALEN);
384 ehdr->h_proto = len;
385 }
386 return 0;
387}
388EXPORT_SYMBOL(ieee80211_data_to_8023);
389
eaf85ca7 390int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
e31a16d6
ZY		 391 enum nl80211_iftype iftype, u8 *bssid, bool qos)
392{
393 struct ieee80211_hdr hdr;
394 u16 hdrlen, ethertype;
395 __le16 fc;
396 const u8 *encaps_data;
397 int encaps_len, skip_header_bytes;
398 int nh_pos, h_pos;
399 int head_need;
400
401 if (unlikely(skb->len < ETH_HLEN))
402 return -EINVAL;
403
404 nh_pos = skb_network_header(skb) - skb->data;
405 h_pos = skb_transport_header(skb) - skb->data;
406
407 /* convert Ethernet header to proper 802.11 header (based on
408 * operation mode) */
409 ethertype = (skb->data[12] << 8) | skb->data[13];
410 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
411
412 switch (iftype) {
413 case NL80211_IFTYPE_AP:
414 case NL80211_IFTYPE_AP_VLAN:
415 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
416 /* DA BSSID SA */
417 memcpy(hdr.addr1, skb->data, ETH_ALEN);
418 memcpy(hdr.addr2, addr, ETH_ALEN);
419 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
420 hdrlen = 24;
421 break;
422 case NL80211_IFTYPE_STATION:
423 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
424 /* BSSID SA DA */
425 memcpy(hdr.addr1, bssid, ETH_ALEN);
426 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
427 memcpy(hdr.addr3, skb->data, ETH_ALEN);
428 hdrlen = 24;
429 break;
430 case NL80211_IFTYPE_ADHOC:
431 /* DA SA BSSID */
432 memcpy(hdr.addr1, skb->data, ETH_ALEN);
433 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
434 memcpy(hdr.addr3, bssid, ETH_ALEN);
435 hdrlen = 24;
436 break;
437 default:
438 return -EOPNOTSUPP;
439 }
440
441 if (qos) {
442 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
443 hdrlen += 2;
444 }
445
446 hdr.frame_control = fc;
447 hdr.duration_id = 0;
448 hdr.seq_ctrl = 0;
449
450 skip_header_bytes = ETH_HLEN;
451 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
452 encaps_data = bridge_tunnel_header;
453 encaps_len = sizeof(bridge_tunnel_header);
454 skip_header_bytes -= 2;
455 } else if (ethertype > 0x600) {
456 encaps_data = rfc1042_header;
457 encaps_len = sizeof(rfc1042_header);
458 skip_header_bytes -= 2;
459 } else {
460 encaps_data = NULL;
461 encaps_len = 0;
462 }
463
464 skb_pull(skb, skip_header_bytes);
465 nh_pos -= skip_header_bytes;
466 h_pos -= skip_header_bytes;
467
468 head_need = hdrlen + encaps_len - skb_headroom(skb);
469
470 if (head_need > 0 || skb_cloned(skb)) {
471 head_need = max(head_need, 0);
472 if (head_need)
473 skb_orphan(skb);
474
475 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) {
476 printk(KERN_ERR "failed to reallocate Tx buffer\n");
477 return -ENOMEM;
478 }
479 skb->truesize += head_need;
480 }
481
482 if (encaps_data) {
483 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
484 nh_pos += encaps_len;
485 h_pos += encaps_len;
486 }
487
488 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
489
490 nh_pos += hdrlen;
491 h_pos += hdrlen;
492
493 /* Update skb pointers to various headers since this modified frame
494 * is going to go through Linux networking code that may potentially
495 * need things like pointer to IP header. */
496 skb_set_mac_header(skb, 0);
497 skb_set_network_header(skb, nh_pos);
498 skb_set_transport_header(skb, h_pos);
499
500 return 0;
501}
502EXPORT_SYMBOL(ieee80211_data_from_8023);
503
eaf85ca7
ZY		 504
505void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
506 const u8 *addr, enum nl80211_iftype iftype,
507 const unsigned int extra_headroom)
508{
509 struct sk_buff *frame = NULL;
510 u16 ethertype;
511 u8 *payload;
512 const struct ethhdr *eth;
513 int remaining, err;
514 u8 dst[ETH_ALEN], src[ETH_ALEN];
515
516 err = ieee80211_data_to_8023(skb, addr, iftype);
517 if (err)
518 goto out;
519
520 /* skip the wrapping header */
521 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
522 if (!eth)
523 goto out;
524
525 while (skb != frame) {
526 u8 padding;
527 __be16 len = eth->h_proto;
528 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
529
530 remaining = skb->len;
531 memcpy(dst, eth->h_dest, ETH_ALEN);
532 memcpy(src, eth->h_source, ETH_ALEN);
533
534 padding = (4 - subframe_len) & 0x3;
535 /* the last MSDU has no padding */
536 if (subframe_len > remaining)
537 goto purge;
538
539 skb_pull(skb, sizeof(struct ethhdr));
540 /* reuse skb for the last subframe */
541 if (remaining <= subframe_len + padding)
542 frame = skb;
543 else {
544 unsigned int hlen = ALIGN(extra_headroom, 4);
545 /*
546 * Allocate and reserve two bytes more for payload
547 * alignment since sizeof(struct ethhdr) is 14.
548 */
549 frame = dev_alloc_skb(hlen + subframe_len + 2);
550 if (!frame)
551 goto purge;
552
553 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
554 memcpy(skb_put(frame, ntohs(len)), skb->data,
555 ntohs(len));
556
557 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
558 padding);
559 if (!eth) {
560 dev_kfree_skb(frame);
561 goto purge;
562 }
563 }
564
565 skb_reset_network_header(frame);
566 frame->dev = skb->dev;
567 frame->priority = skb->priority;
568
569 payload = frame->data;
570 ethertype = (payload[6] << 8) | payload[7];
571
572 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
573 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
574 compare_ether_addr(payload,
575 bridge_tunnel_header) == 0)) {
576 /* remove RFC1042 or Bridge-Tunnel
577 * encapsulation and replace EtherType */
578 skb_pull(frame, 6);
579 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
580 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
581 } else {
582 memcpy(skb_push(frame, sizeof(__be16)), &len,
583 sizeof(__be16));
584 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
585 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
586 }
587 __skb_queue_tail(list, frame);
588 }
589
590 return;
591
592 purge:
593 __skb_queue_purge(list);
594 out:
595 dev_kfree_skb(skb);
596}
597EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
598
e31a16d6
ZY		 599/* Given a data frame determine the 802.1p/1d tag to use. */
600unsigned int cfg80211_classify8021d(struct sk_buff *skb)
601{
602 unsigned int dscp;
603
604 /* skb->priority values from 256->263 are magic values to
605 * directly indicate a specific 802.1d priority. This is used
606 * to allow 802.1d priority to be passed directly in from VLAN
607 * tags, etc.
608 */
609 if (skb->priority >= 256 && skb->priority <= 263)
610 return skb->priority - 256;
611
612 switch (skb->protocol) {
613 case htons(ETH_P_IP):
614 dscp = ip_hdr(skb)->tos & 0xfc;
615 break;
616 default:
617 return 0;
618 }
619
620 return dscp >> 5;
621}
622EXPORT_SYMBOL(cfg80211_classify8021d);
517357c6
JB		 623
624const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
625{
626 u8 *end, *pos;
627
628 pos = bss->information_elements;
629 if (pos == NULL)
630 return NULL;
631 end = pos + bss->len_information_elements;
632
633 while (pos + 1 < end) {
634 if (pos + 2 + pos[1] > end)
635 break;
636 if (pos[0] == ie)
637 return pos;
638 pos += 2 + pos[1];
639 }
640
641 return NULL;
642}
643EXPORT_SYMBOL(ieee80211_bss_get_ie);
fffd0934
JB		 644
645void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
646{
647 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
648 struct net_device *dev = wdev->netdev;
649 int i;
650
651 if (!wdev->connect_keys)
652 return;
653
654 for (i = 0; i < 6; i++) {
655 if (!wdev->connect_keys->params[i].cipher)
656 continue;
657 if (rdev->ops->add_key(wdev->wiphy, dev, i, NULL,
1e056665 658 &wdev->connect_keys->params[i])) {
fffd0934
JB		 659 printk(KERN_ERR "%s: failed to set key %d\n",
660 dev->name, i);
1e056665
ZY		 661 continue;
662 }
fffd0934 663 if (wdev->connect_keys->def == i)
1e056665 664 if (rdev->ops->set_default_key(wdev->wiphy, dev, i)) {
fffd0934
JB		 665 printk(KERN_ERR "%s: failed to set defkey %d\n",
666 dev->name, i);
1e056665
ZY		 667 continue;
668 }
fffd0934
JB		 669 if (wdev->connect_keys->defmgmt == i)
670 if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
671 printk(KERN_ERR "%s: failed to set mgtdef %d\n",
672 dev->name, i);
673 }
674
675 kfree(wdev->connect_keys);
676 wdev->connect_keys = NULL;
677}
3d54d255
JB		 678
679static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
680{
681 struct cfg80211_event *ev;
682 unsigned long flags;
683 const u8 *bssid = NULL;
684
685 spin_lock_irqsave(&wdev->event_lock, flags);
686 while (!list_empty(&wdev->event_list)) {
687 ev = list_first_entry(&wdev->event_list,
688 struct cfg80211_event, list);
689 list_del(&ev->list);
690 spin_unlock_irqrestore(&wdev->event_lock, flags);
691
692 wdev_lock(wdev);
693 switch (ev->type) {
694 case EVENT_CONNECT_RESULT:
695 if (!is_zero_ether_addr(ev->cr.bssid))
696 bssid = ev->cr.bssid;
697 __cfg80211_connect_result(
698 wdev->netdev, bssid,
699 ev->cr.req_ie, ev->cr.req_ie_len,
700 ev->cr.resp_ie, ev->cr.resp_ie_len,
701 ev->cr.status,
702 ev->cr.status == WLAN_STATUS_SUCCESS,
703 NULL);
704 break;
705 case EVENT_ROAMED:
706 __cfg80211_roamed(wdev, ev->rm.bssid,
707 ev->rm.req_ie, ev->rm.req_ie_len,
708 ev->rm.resp_ie, ev->rm.resp_ie_len);
709 break;
710 case EVENT_DISCONNECTED:
711 __cfg80211_disconnected(wdev->netdev,
712 ev->dc.ie, ev->dc.ie_len,
713 ev->dc.reason, true);
714 break;
715 case EVENT_IBSS_JOINED:
716 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
717 break;
718 }
719 wdev_unlock(wdev);
720
721 kfree(ev);
722
723 spin_lock_irqsave(&wdev->event_lock, flags);
724 }
725 spin_unlock_irqrestore(&wdev->event_lock, flags);
726}
727
728void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
729{
730 struct wireless_dev *wdev;
731
732 ASSERT_RTNL();
733 ASSERT_RDEV_LOCK(rdev);
734
735 mutex_lock(&rdev->devlist_mtx);
736
737 list_for_each_entry(wdev, &rdev->netdev_list, list)
738 cfg80211_process_wdev_events(wdev);
739
740 mutex_unlock(&rdev->devlist_mtx);
741}
742
743int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
744 struct net_device *dev, enum nl80211_iftype ntype,
745 u32 *flags, struct vif_params *params)
746{
747 int err;
748 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
749
750 ASSERT_RDEV_LOCK(rdev);
751
752 /* don't support changing VLANs, you just re-create them */
753 if (otype == NL80211_IFTYPE_AP_VLAN)
754 return -EOPNOTSUPP;
755
756 if (!rdev->ops->change_virtual_intf ||
757 !(rdev->wiphy.interface_modes & (1 << ntype)))
758 return -EOPNOTSUPP;
759
ad4bb6f8
JB		 760 /* if it's part of a bridge, reject changing type to station/ibss */
761 if (dev->br_port && (ntype == NL80211_IFTYPE_ADHOC ||
762 ntype == NL80211_IFTYPE_STATION))
763 return -EBUSY;
764
3d54d255 765 if (ntype != otype) {
9bc383de
JB		 766 dev->ieee80211_ptr->use_4addr = false;
767
3d54d255
JB		 768 switch (otype) {
769 case NL80211_IFTYPE_ADHOC:
770 cfg80211_leave_ibss(rdev, dev, false);
771 break;
772 case NL80211_IFTYPE_STATION:
773 cfg80211_disconnect(rdev, dev,
774 WLAN_REASON_DEAUTH_LEAVING, true);
775 break;
776 case NL80211_IFTYPE_MESH_POINT:
777 /* mesh should be handled? */
778 break;
779 default:
780 break;
781 }
782
783 cfg80211_process_rdev_events(rdev);
784 }
785
786 err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
787 ntype, flags, params);
788
789 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
790
9bc383de
JB		 791 if (!err && params && params->use_4addr != -1)
792 dev->ieee80211_ptr->use_4addr = params->use_4addr;
793
ad4bb6f8
JB		 794 if (!err) {
795 dev->priv_flags &= ~IFF_DONT_BRIDGE;
796 switch (ntype) {
797 case NL80211_IFTYPE_STATION:
798 if (dev->ieee80211_ptr->use_4addr)
799 break;
800 /* fall through */
801 case NL80211_IFTYPE_ADHOC:
802 dev->priv_flags |= IFF_DONT_BRIDGE;
803 break;
804 case NL80211_IFTYPE_AP:
805 case NL80211_IFTYPE_AP_VLAN:
806 case NL80211_IFTYPE_WDS:
807 case NL80211_IFTYPE_MESH_POINT:
808 /* bridging OK */
809 break;
810 case NL80211_IFTYPE_MONITOR:
811 /* monitor can't bridge anyway */
812 break;
813 case NL80211_IFTYPE_UNSPECIFIED:
814 case __NL80211_IFTYPE_AFTER_LAST:
815 /* not happening */
816 break;
817 }
818 }
819
3d54d255
JB		 820 return err;
821}
254416aa
JL		 822
823u16 cfg80211_calculate_bitrate(struct rate_info *rate)
824{
825 int modulation, streams, bitrate;
826
827 if (!(rate->flags & RATE_INFO_FLAGS_MCS))
828 return rate->legacy;
829
830 /* the formula below does only work for MCS values smaller than 32 */
831 if (rate->mcs >= 32)
832 return 0;
833
834 modulation = rate->mcs & 7;
835 streams = (rate->mcs >> 3) + 1;
836
837 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
838 13500000 : 6500000;
839
840 if (modulation < 4)
841 bitrate *= (modulation + 1);
842 else if (modulation == 4)
843 bitrate *= (modulation + 2);
844 else
845 bitrate *= (modulation + 3);
846
847 bitrate *= streams;
848
849 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
850 bitrate = (bitrate / 9) * 10;
851
852 /* do NOT round down here */
853 return (bitrate + 50000) / 100000;
854}
Clone of davem's net-next-2.6 tree