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Merge remote-tracking branch 'origin/3.3/march-native' into 3.3/master
[zen-stable.git] / net / wireless / util.c
blob9aa9db6c81411ddfcd77c34de8128fcd57e2e5d2
1 /*
2 * Wireless utility functions
3 *
4 * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
5 */
6 #include <linux/export.h>
7 #include <linux/bitops.h>
8 #include <linux/etherdevice.h>
9 #include <linux/slab.h>
10 #include <net/cfg80211.h>
11 #include <net/ip.h>
12 #include <net/dsfield.h>
13 #include "core.h"
14
15 struct ieee80211_rate *
16 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
17 u32 basic_rates, int bitrate)
18 {
19 struct ieee80211_rate *result = &sband->bitrates[0];
20 int i;
21
22 for (i = 0; i < sband->n_bitrates; i++) {
23 if (!(basic_rates & BIT(i)))
24 continue;
25 if (sband->bitrates[i].bitrate > bitrate)
26 continue;
27 result = &sband->bitrates[i];
28 }
29
30 return result;
31 }
32 EXPORT_SYMBOL(ieee80211_get_response_rate);
33
34 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
35 {
36 /* see 802.11 17.3.8.3.2 and Annex J
37 * there are overlapping channel numbers in 5GHz and 2GHz bands */
38 if (band == IEEE80211_BAND_5GHZ) {
39 if (chan >= 182 && chan <= 196)
40 return 4000 + chan * 5;
41 else
42 return 5000 + chan * 5;
43 } else { /* IEEE80211_BAND_2GHZ */
44 if (chan == 14)
45 return 2484;
46 else if (chan < 14)
47 return 2407 + chan * 5;
48 else
49 return 0; /* not supported */
50 }
51 }
52 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
53
54 int ieee80211_frequency_to_channel(int freq)
55 {
56 /* see 802.11 17.3.8.3.2 and Annex J */
57 if (freq == 2484)
58 return 14;
59 else if (freq < 2484)
60 return (freq - 2407) / 5;
61 else if (freq >= 4910 && freq <= 4980)
62 return (freq - 4000) / 5;
63 else
64 return (freq - 5000) / 5;
65 }
66 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
67
68 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
69 int freq)
70 {
71 enum ieee80211_band band;
72 struct ieee80211_supported_band *sband;
73 int i;
74
75 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
76 sband = wiphy->bands[band];
77
78 if (!sband)
79 continue;
80
81 for (i = 0; i < sband->n_channels; i++) {
82 if (sband->channels[i].center_freq == freq)
83 return &sband->channels[i];
84 }
85 }
86
87 return NULL;
88 }
89 EXPORT_SYMBOL(__ieee80211_get_channel);
90
91 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
92 enum ieee80211_band band)
93 {
94 int i, want;
95
96 switch (band) {
97 case IEEE80211_BAND_5GHZ:
98 want = 3;
99 for (i = 0; i < sband->n_bitrates; i++) {
100 if (sband->bitrates[i].bitrate == 60 ||
101 sband->bitrates[i].bitrate == 120 ||
102 sband->bitrates[i].bitrate == 240) {
103 sband->bitrates[i].flags |=
104 IEEE80211_RATE_MANDATORY_A;
105 want--;
106 }
107 }
108 WARN_ON(want);
109 break;
110 case IEEE80211_BAND_2GHZ:
111 want = 7;
112 for (i = 0; i < sband->n_bitrates; i++) {
113 if (sband->bitrates[i].bitrate == 10) {
114 sband->bitrates[i].flags |=
115 IEEE80211_RATE_MANDATORY_B |
116 IEEE80211_RATE_MANDATORY_G;
117 want--;
118 }
119
120 if (sband->bitrates[i].bitrate == 20 ||
121 sband->bitrates[i].bitrate == 55 ||
122 sband->bitrates[i].bitrate == 110 ||
123 sband->bitrates[i].bitrate == 60 ||
124 sband->bitrates[i].bitrate == 120 ||
125 sband->bitrates[i].bitrate == 240) {
126 sband->bitrates[i].flags |=
127 IEEE80211_RATE_MANDATORY_G;
128 want--;
129 }
130
131 if (sband->bitrates[i].bitrate != 10 &&
132 sband->bitrates[i].bitrate != 20 &&
133 sband->bitrates[i].bitrate != 55 &&
134 sband->bitrates[i].bitrate != 110)
135 sband->bitrates[i].flags |=
136 IEEE80211_RATE_ERP_G;
137 }
138 WARN_ON(want != 0 && want != 3 && want != 6);
139 break;
140 case IEEE80211_NUM_BANDS:
141 WARN_ON(1);
142 break;
143 }
144 }
145
146 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
147 {
148 enum ieee80211_band band;
149
150 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
151 if (wiphy->bands[band])
152 set_mandatory_flags_band(wiphy->bands[band], band);
153 }
154
155 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
156 {
157 int i;
158 for (i = 0; i < wiphy->n_cipher_suites; i++)
159 if (cipher == wiphy->cipher_suites[i])
160 return true;
161 return false;
162 }
163
164 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
165 struct key_params *params, int key_idx,
166 bool pairwise, const u8 *mac_addr)
167 {
168 if (key_idx > 5)
169 return -EINVAL;
170
171 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
172 return -EINVAL;
173
174 if (pairwise && !mac_addr)
175 return -EINVAL;
176
177 /*
178 * Disallow pairwise keys with non-zero index unless it's WEP
179 * or a vendor specific cipher (because current deployments use
180 * pairwise WEP keys with non-zero indices and for vendor specific
181 * ciphers this should be validated in the driver or hardware level
182 * - but 802.11i clearly specifies to use zero)
183 */
184 if (pairwise && key_idx &&
185 ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
186 (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
187 (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
188 return -EINVAL;
189
190 switch (params->cipher) {
191 case WLAN_CIPHER_SUITE_WEP40:
192 if (params->key_len != WLAN_KEY_LEN_WEP40)
193 return -EINVAL;
194 break;
195 case WLAN_CIPHER_SUITE_TKIP:
196 if (params->key_len != WLAN_KEY_LEN_TKIP)
197 return -EINVAL;
198 break;
199 case WLAN_CIPHER_SUITE_CCMP:
200 if (params->key_len != WLAN_KEY_LEN_CCMP)
201 return -EINVAL;
202 break;
203 case WLAN_CIPHER_SUITE_WEP104:
204 if (params->key_len != WLAN_KEY_LEN_WEP104)
205 return -EINVAL;
206 break;
207 case WLAN_CIPHER_SUITE_AES_CMAC:
208 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
209 return -EINVAL;
210 break;
211 default:
212 /*
213 * We don't know anything about this algorithm,
214 * allow using it -- but the driver must check
215 * all parameters! We still check below whether
216 * or not the driver supports this algorithm,
217 * of course.
218 */
219 break;
220 }
221
222 if (params->seq) {
223 switch (params->cipher) {
224 case WLAN_CIPHER_SUITE_WEP40:
225 case WLAN_CIPHER_SUITE_WEP104:
226 /* These ciphers do not use key sequence */
227 return -EINVAL;
228 case WLAN_CIPHER_SUITE_TKIP:
229 case WLAN_CIPHER_SUITE_CCMP:
230 case WLAN_CIPHER_SUITE_AES_CMAC:
231 if (params->seq_len != 6)
232 return -EINVAL;
233 break;
234 }
235 }
236
237 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
238 return -EINVAL;
239
240 return 0;
241 }
242
243 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
244 {
245 unsigned int hdrlen = 24;
246
247 if (ieee80211_is_data(fc)) {
248 if (ieee80211_has_a4(fc))
249 hdrlen = 30;
250 if (ieee80211_is_data_qos(fc)) {
251 hdrlen += IEEE80211_QOS_CTL_LEN;
252 if (ieee80211_has_order(fc))
253 hdrlen += IEEE80211_HT_CTL_LEN;
254 }
255 goto out;
256 }
257
258 if (ieee80211_is_ctl(fc)) {
259 /*
260 * ACK and CTS are 10 bytes, all others 16. To see how
261 * to get this condition consider
262 * subtype mask: 0b0000000011110000 (0x00F0)
263 * ACK subtype: 0b0000000011010000 (0x00D0)
264 * CTS subtype: 0b0000000011000000 (0x00C0)
265 * bits that matter: ^^^ (0x00E0)
266 * value of those: 0b0000000011000000 (0x00C0)
267 */
268 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
269 hdrlen = 10;
270 else
271 hdrlen = 16;
272 }
273 out:
274 return hdrlen;
275 }
276 EXPORT_SYMBOL(ieee80211_hdrlen);
277
278 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
279 {
280 const struct ieee80211_hdr *hdr =
281 (const struct ieee80211_hdr *)skb->data;
282 unsigned int hdrlen;
283
284 if (unlikely(skb->len < 10))
285 return 0;
286 hdrlen = ieee80211_hdrlen(hdr->frame_control);
287 if (unlikely(hdrlen > skb->len))
288 return 0;
289 return hdrlen;
290 }
291 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
292
293 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
294 {
295 int ae = meshhdr->flags & MESH_FLAGS_AE;
296 /* 7.1.3.5a.2 */
297 switch (ae) {
298 case 0:
299 return 6;
300 case MESH_FLAGS_AE_A4:
301 return 12;
302 case MESH_FLAGS_AE_A5_A6:
303 return 18;
304 case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
305 return 24;
306 default:
307 return 6;
308 }
309 }
310
311 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
312 enum nl80211_iftype iftype)
313 {
314 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
315 u16 hdrlen, ethertype;
316 u8 *payload;
317 u8 dst[ETH_ALEN];
318 u8 src[ETH_ALEN] __aligned(2);
319
320 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
321 return -1;
322
323 hdrlen = ieee80211_hdrlen(hdr->frame_control);
324
325 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
326 * header
327 * IEEE 802.11 address fields:
328 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
329 * 0 0 DA SA BSSID n/a
330 * 0 1 DA BSSID SA n/a
331 * 1 0 BSSID SA DA n/a
332 * 1 1 RA TA DA SA
333 */
334 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
335 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
336
337 switch (hdr->frame_control &
338 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
339 case cpu_to_le16(IEEE80211_FCTL_TODS):
340 if (unlikely(iftype != NL80211_IFTYPE_AP &&
341 iftype != NL80211_IFTYPE_AP_VLAN &&
342 iftype != NL80211_IFTYPE_P2P_GO))
343 return -1;
344 break;
345 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
346 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
347 iftype != NL80211_IFTYPE_MESH_POINT &&
348 iftype != NL80211_IFTYPE_AP_VLAN &&
349 iftype != NL80211_IFTYPE_STATION))
350 return -1;
351 if (iftype == NL80211_IFTYPE_MESH_POINT) {
352 struct ieee80211s_hdr *meshdr =
353 (struct ieee80211s_hdr *) (skb->data + hdrlen);
354 /* make sure meshdr->flags is on the linear part */
355 if (!pskb_may_pull(skb, hdrlen + 1))
356 return -1;
357 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
358 skb_copy_bits(skb, hdrlen +
359 offsetof(struct ieee80211s_hdr, eaddr1),
360 dst, ETH_ALEN);
361 skb_copy_bits(skb, hdrlen +
362 offsetof(struct ieee80211s_hdr, eaddr2),
363 src, ETH_ALEN);
364 }
365 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
366 }
367 break;
368 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
369 if ((iftype != NL80211_IFTYPE_STATION &&
370 iftype != NL80211_IFTYPE_P2P_CLIENT &&
371 iftype != NL80211_IFTYPE_MESH_POINT) ||
372 (is_multicast_ether_addr(dst) &&
373 !compare_ether_addr(src, addr)))
374 return -1;
375 if (iftype == NL80211_IFTYPE_MESH_POINT) {
376 struct ieee80211s_hdr *meshdr =
377 (struct ieee80211s_hdr *) (skb->data + hdrlen);
378 /* make sure meshdr->flags is on the linear part */
379 if (!pskb_may_pull(skb, hdrlen + 1))
380 return -1;
381 if (meshdr->flags & MESH_FLAGS_AE_A4)
382 skb_copy_bits(skb, hdrlen +
383 offsetof(struct ieee80211s_hdr, eaddr1),
384 src, ETH_ALEN);
385 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
386 }
387 break;
388 case cpu_to_le16(0):
389 if (iftype != NL80211_IFTYPE_ADHOC &&
390 iftype != NL80211_IFTYPE_STATION)
391 return -1;
392 break;
393 }
394
395 if (!pskb_may_pull(skb, hdrlen + 8))
396 return -1;
397
398 payload = skb->data + hdrlen;
399 ethertype = (payload[6] << 8) | payload[7];
400
401 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
402 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
403 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
404 /* remove RFC1042 or Bridge-Tunnel encapsulation and
405 * replace EtherType */
406 skb_pull(skb, hdrlen + 6);
407 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
408 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
409 } else {
410 struct ethhdr *ehdr;
411 __be16 len;
412
413 skb_pull(skb, hdrlen);
414 len = htons(skb->len);
415 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
416 memcpy(ehdr->h_dest, dst, ETH_ALEN);
417 memcpy(ehdr->h_source, src, ETH_ALEN);
418 ehdr->h_proto = len;
419 }
420 return 0;
421 }
422 EXPORT_SYMBOL(ieee80211_data_to_8023);
423
424 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
425 enum nl80211_iftype iftype, u8 *bssid, bool qos)
426 {
427 struct ieee80211_hdr hdr;
428 u16 hdrlen, ethertype;
429 __le16 fc;
430 const u8 *encaps_data;
431 int encaps_len, skip_header_bytes;
432 int nh_pos, h_pos;
433 int head_need;
434
435 if (unlikely(skb->len < ETH_HLEN))
436 return -EINVAL;
437
438 nh_pos = skb_network_header(skb) - skb->data;
439 h_pos = skb_transport_header(skb) - skb->data;
440
441 /* convert Ethernet header to proper 802.11 header (based on
442 * operation mode) */
443 ethertype = (skb->data[12] << 8) | skb->data[13];
444 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
445
446 switch (iftype) {
447 case NL80211_IFTYPE_AP:
448 case NL80211_IFTYPE_AP_VLAN:
449 case NL80211_IFTYPE_P2P_GO:
450 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
451 /* DA BSSID SA */
452 memcpy(hdr.addr1, skb->data, ETH_ALEN);
453 memcpy(hdr.addr2, addr, ETH_ALEN);
454 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
455 hdrlen = 24;
456 break;
457 case NL80211_IFTYPE_STATION:
458 case NL80211_IFTYPE_P2P_CLIENT:
459 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
460 /* BSSID SA DA */
461 memcpy(hdr.addr1, bssid, ETH_ALEN);
462 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
463 memcpy(hdr.addr3, skb->data, ETH_ALEN);
464 hdrlen = 24;
465 break;
466 case NL80211_IFTYPE_ADHOC:
467 /* DA SA BSSID */
468 memcpy(hdr.addr1, skb->data, ETH_ALEN);
469 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
470 memcpy(hdr.addr3, bssid, ETH_ALEN);
471 hdrlen = 24;
472 break;
473 default:
474 return -EOPNOTSUPP;
475 }
476
477 if (qos) {
478 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
479 hdrlen += 2;
480 }
481
482 hdr.frame_control = fc;
483 hdr.duration_id = 0;
484 hdr.seq_ctrl = 0;
485
486 skip_header_bytes = ETH_HLEN;
487 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
488 encaps_data = bridge_tunnel_header;
489 encaps_len = sizeof(bridge_tunnel_header);
490 skip_header_bytes -= 2;
491 } else if (ethertype > 0x600) {
492 encaps_data = rfc1042_header;
493 encaps_len = sizeof(rfc1042_header);
494 skip_header_bytes -= 2;
495 } else {
496 encaps_data = NULL;
497 encaps_len = 0;
498 }
499
500 skb_pull(skb, skip_header_bytes);
501 nh_pos -= skip_header_bytes;
502 h_pos -= skip_header_bytes;
503
504 head_need = hdrlen + encaps_len - skb_headroom(skb);
505
506 if (head_need > 0 || skb_cloned(skb)) {
507 head_need = max(head_need, 0);
508 if (head_need)
509 skb_orphan(skb);
510
511 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
512 return -ENOMEM;
513
514 skb->truesize += head_need;
515 }
516
517 if (encaps_data) {
518 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
519 nh_pos += encaps_len;
520 h_pos += encaps_len;
521 }
522
523 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
524
525 nh_pos += hdrlen;
526 h_pos += hdrlen;
527
528 /* Update skb pointers to various headers since this modified frame
529 * is going to go through Linux networking code that may potentially
530 * need things like pointer to IP header. */
531 skb_set_mac_header(skb, 0);
532 skb_set_network_header(skb, nh_pos);
533 skb_set_transport_header(skb, h_pos);
534
535 return 0;
536 }
537 EXPORT_SYMBOL(ieee80211_data_from_8023);
538
539
540 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
541 const u8 *addr, enum nl80211_iftype iftype,
542 const unsigned int extra_headroom,
543 bool has_80211_header)
544 {
545 struct sk_buff *frame = NULL;
546 u16 ethertype;
547 u8 *payload;
548 const struct ethhdr *eth;
549 int remaining, err;
550 u8 dst[ETH_ALEN], src[ETH_ALEN];
551
552 if (has_80211_header) {
553 err = ieee80211_data_to_8023(skb, addr, iftype);
554 if (err)
555 goto out;
556
557 /* skip the wrapping header */
558 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
559 if (!eth)
560 goto out;
561 } else {
562 eth = (struct ethhdr *) skb->data;
563 }
564
565 while (skb != frame) {
566 u8 padding;
567 __be16 len = eth->h_proto;
568 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
569
570 remaining = skb->len;
571 memcpy(dst, eth->h_dest, ETH_ALEN);
572 memcpy(src, eth->h_source, ETH_ALEN);
573
574 padding = (4 - subframe_len) & 0x3;
575 /* the last MSDU has no padding */
576 if (subframe_len > remaining)
577 goto purge;
578
579 skb_pull(skb, sizeof(struct ethhdr));
580 /* reuse skb for the last subframe */
581 if (remaining <= subframe_len + padding)
582 frame = skb;
583 else {
584 unsigned int hlen = ALIGN(extra_headroom, 4);
585 /*
586 * Allocate and reserve two bytes more for payload
587 * alignment since sizeof(struct ethhdr) is 14.
588 */
589 frame = dev_alloc_skb(hlen + subframe_len + 2);
590 if (!frame)
591 goto purge;
592
593 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
594 memcpy(skb_put(frame, ntohs(len)), skb->data,
595 ntohs(len));
596
597 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
598 padding);
599 if (!eth) {
600 dev_kfree_skb(frame);
601 goto purge;
602 }
603 }
604
605 skb_reset_network_header(frame);
606 frame->dev = skb->dev;
607 frame->priority = skb->priority;
608
609 payload = frame->data;
610 ethertype = (payload[6] << 8) | payload[7];
611
612 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
613 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
614 compare_ether_addr(payload,
615 bridge_tunnel_header) == 0)) {
616 /* remove RFC1042 or Bridge-Tunnel
617 * encapsulation and replace EtherType */
618 skb_pull(frame, 6);
619 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
620 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
621 } else {
622 memcpy(skb_push(frame, sizeof(__be16)), &len,
623 sizeof(__be16));
624 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
625 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
626 }
627 __skb_queue_tail(list, frame);
628 }
629
630 return;
631
632 purge:
633 __skb_queue_purge(list);
634 out:
635 dev_kfree_skb(skb);
636 }
637 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
638
639 /* Given a data frame determine the 802.1p/1d tag to use. */
640 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
641 {
642 unsigned int dscp;
643
644 /* skb->priority values from 256->263 are magic values to
645 * directly indicate a specific 802.1d priority. This is used
646 * to allow 802.1d priority to be passed directly in from VLAN
647 * tags, etc.
648 */
649 if (skb->priority >= 256 && skb->priority <= 263)
650 return skb->priority - 256;
651
652 switch (skb->protocol) {
653 case htons(ETH_P_IP):
654 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
655 break;
656 case htons(ETH_P_IPV6):
657 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
658 break;
659 default:
660 return 0;
661 }
662
663 return dscp >> 5;
664 }
665 EXPORT_SYMBOL(cfg80211_classify8021d);
666
667 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
668 {
669 u8 *end, *pos;
670
671 pos = bss->information_elements;
672 if (pos == NULL)
673 return NULL;
674 end = pos + bss->len_information_elements;
675
676 while (pos + 1 < end) {
677 if (pos + 2 + pos[1] > end)
678 break;
679 if (pos[0] == ie)
680 return pos;
681 pos += 2 + pos[1];
682 }
683
684 return NULL;
685 }
686 EXPORT_SYMBOL(ieee80211_bss_get_ie);
687
688 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
689 {
690 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
691 struct net_device *dev = wdev->netdev;
692 int i;
693
694 if (!wdev->connect_keys)
695 return;
696
697 for (i = 0; i < 6; i++) {
698 if (!wdev->connect_keys->params[i].cipher)
699 continue;
700 if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL,
701 &wdev->connect_keys->params[i])) {
702 netdev_err(dev, "failed to set key %d\n", i);
703 continue;
704 }
705 if (wdev->connect_keys->def == i)
706 if (rdev->ops->set_default_key(wdev->wiphy, dev,
707 i, true, true)) {
708 netdev_err(dev, "failed to set defkey %d\n", i);
709 continue;
710 }
711 if (wdev->connect_keys->defmgmt == i)
712 if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
713 netdev_err(dev, "failed to set mgtdef %d\n", i);
714 }
715
716 kfree(wdev->connect_keys);
717 wdev->connect_keys = NULL;
718 }
719
720 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
721 {
722 struct cfg80211_event *ev;
723 unsigned long flags;
724 const u8 *bssid = NULL;
725
726 spin_lock_irqsave(&wdev->event_lock, flags);
727 while (!list_empty(&wdev->event_list)) {
728 ev = list_first_entry(&wdev->event_list,
729 struct cfg80211_event, list);
730 list_del(&ev->list);
731 spin_unlock_irqrestore(&wdev->event_lock, flags);
732
733 wdev_lock(wdev);
734 switch (ev->type) {
735 case EVENT_CONNECT_RESULT:
736 if (!is_zero_ether_addr(ev->cr.bssid))
737 bssid = ev->cr.bssid;
738 __cfg80211_connect_result(
739 wdev->netdev, bssid,
740 ev->cr.req_ie, ev->cr.req_ie_len,
741 ev->cr.resp_ie, ev->cr.resp_ie_len,
742 ev->cr.status,
743 ev->cr.status == WLAN_STATUS_SUCCESS,
744 NULL);
745 break;
746 case EVENT_ROAMED:
747 __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
748 ev->rm.req_ie_len, ev->rm.resp_ie,
749 ev->rm.resp_ie_len);
750 break;
751 case EVENT_DISCONNECTED:
752 __cfg80211_disconnected(wdev->netdev,
753 ev->dc.ie, ev->dc.ie_len,
754 ev->dc.reason, true);
755 break;
756 case EVENT_IBSS_JOINED:
757 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
758 break;
759 }
760 wdev_unlock(wdev);
761
762 kfree(ev);
763
764 spin_lock_irqsave(&wdev->event_lock, flags);
765 }
766 spin_unlock_irqrestore(&wdev->event_lock, flags);
767 }
768
769 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
770 {
771 struct wireless_dev *wdev;
772
773 ASSERT_RTNL();
774 ASSERT_RDEV_LOCK(rdev);
775
776 mutex_lock(&rdev->devlist_mtx);
777
778 list_for_each_entry(wdev, &rdev->netdev_list, list)
779 cfg80211_process_wdev_events(wdev);
780
781 mutex_unlock(&rdev->devlist_mtx);
782 }
783
784 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
785 struct net_device *dev, enum nl80211_iftype ntype,
786 u32 *flags, struct vif_params *params)
787 {
788 int err;
789 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
790
791 ASSERT_RDEV_LOCK(rdev);
792
793 /* don't support changing VLANs, you just re-create them */
794 if (otype == NL80211_IFTYPE_AP_VLAN)
795 return -EOPNOTSUPP;
796
797 if (!rdev->ops->change_virtual_intf ||
798 !(rdev->wiphy.interface_modes & (1 << ntype)))
799 return -EOPNOTSUPP;
800
801 /* if it's part of a bridge, reject changing type to station/ibss */
802 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
803 (ntype == NL80211_IFTYPE_ADHOC ||
804 ntype == NL80211_IFTYPE_STATION ||
805 ntype == NL80211_IFTYPE_P2P_CLIENT))
806 return -EBUSY;
807
808 if (ntype != otype) {
809 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
810 ntype);
811 if (err)
812 return err;
813
814 dev->ieee80211_ptr->use_4addr = false;
815 dev->ieee80211_ptr->mesh_id_up_len = 0;
816
817 switch (otype) {
818 case NL80211_IFTYPE_ADHOC:
819 cfg80211_leave_ibss(rdev, dev, false);
820 break;
821 case NL80211_IFTYPE_STATION:
822 case NL80211_IFTYPE_P2P_CLIENT:
823 cfg80211_disconnect(rdev, dev,
824 WLAN_REASON_DEAUTH_LEAVING, true);
825 break;
826 case NL80211_IFTYPE_MESH_POINT:
827 /* mesh should be handled? */
828 break;
829 default:
830 break;
831 }
832
833 cfg80211_process_rdev_events(rdev);
834 }
835
836 err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
837 ntype, flags, params);
838
839 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
840
841 if (!err && params && params->use_4addr != -1)
842 dev->ieee80211_ptr->use_4addr = params->use_4addr;
843
844 if (!err) {
845 dev->priv_flags &= ~IFF_DONT_BRIDGE;
846 switch (ntype) {
847 case NL80211_IFTYPE_STATION:
848 if (dev->ieee80211_ptr->use_4addr)
849 break;
850 /* fall through */
851 case NL80211_IFTYPE_P2P_CLIENT:
852 case NL80211_IFTYPE_ADHOC:
853 dev->priv_flags |= IFF_DONT_BRIDGE;
854 break;
855 case NL80211_IFTYPE_P2P_GO:
856 case NL80211_IFTYPE_AP:
857 case NL80211_IFTYPE_AP_VLAN:
858 case NL80211_IFTYPE_WDS:
859 case NL80211_IFTYPE_MESH_POINT:
860 /* bridging OK */
861 break;
862 case NL80211_IFTYPE_MONITOR:
863 /* monitor can't bridge anyway */
864 break;
865 case NL80211_IFTYPE_UNSPECIFIED:
866 case NUM_NL80211_IFTYPES:
867 /* not happening */
868 break;
869 }
870 }
871
872 return err;
873 }
874
875 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
876 {
877 int modulation, streams, bitrate;
878
879 if (!(rate->flags & RATE_INFO_FLAGS_MCS))
880 return rate->legacy;
881
882 /* the formula below does only work for MCS values smaller than 32 */
883 if (rate->mcs >= 32)
884 return 0;
885
886 modulation = rate->mcs & 7;
887 streams = (rate->mcs >> 3) + 1;
888
889 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
890 13500000 : 6500000;
891
892 if (modulation < 4)
893 bitrate *= (modulation + 1);
894 else if (modulation == 4)
895 bitrate *= (modulation + 2);
896 else
897 bitrate *= (modulation + 3);
898
899 bitrate *= streams;
900
901 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
902 bitrate = (bitrate / 9) * 10;
903
904 /* do NOT round down here */
905 return (bitrate + 50000) / 100000;
906 }
907
908 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
909 u32 beacon_int)
910 {
911 struct wireless_dev *wdev;
912 int res = 0;
913
914 if (!beacon_int)
915 return -EINVAL;
916
917 mutex_lock(&rdev->devlist_mtx);
918
919 list_for_each_entry(wdev, &rdev->netdev_list, list) {
920 if (!wdev->beacon_interval)
921 continue;
922 if (wdev->beacon_interval != beacon_int) {
923 res = -EINVAL;
924 break;
925 }
926 }
927
928 mutex_unlock(&rdev->devlist_mtx);
929
930 return res;
931 }
932
933 int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
934 struct wireless_dev *wdev,
935 enum nl80211_iftype iftype)
936 {
937 struct wireless_dev *wdev_iter;
938 int num[NUM_NL80211_IFTYPES];
939 int total = 1;
940 int i, j;
941
942 ASSERT_RTNL();
943
944 /* Always allow software iftypes */
945 if (rdev->wiphy.software_iftypes & BIT(iftype))
946 return 0;
947
948 /*
949 * Drivers will gradually all set this flag, until all
950 * have it we only enforce for those that set it.
951 */
952 if (!(rdev->wiphy.flags & WIPHY_FLAG_ENFORCE_COMBINATIONS))
953 return 0;
954
955 memset(num, 0, sizeof(num));
956
957 num[iftype] = 1;
958
959 mutex_lock(&rdev->devlist_mtx);
960 list_for_each_entry(wdev_iter, &rdev->netdev_list, list) {
961 if (wdev_iter == wdev)
962 continue;
963 if (!netif_running(wdev_iter->netdev))
964 continue;
965
966 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
967 continue;
968
969 num[wdev_iter->iftype]++;
970 total++;
971 }
972 mutex_unlock(&rdev->devlist_mtx);
973
974 for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
975 const struct ieee80211_iface_combination *c;
976 struct ieee80211_iface_limit *limits;
977
978 c = &rdev->wiphy.iface_combinations[i];
979
980 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
981 GFP_KERNEL);
982 if (!limits)
983 return -ENOMEM;
984 if (total > c->max_interfaces)
985 goto cont;
986
987 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
988 if (rdev->wiphy.software_iftypes & BIT(iftype))
989 continue;
990 for (j = 0; j < c->n_limits; j++) {
991 if (!(limits[j].types & iftype))
992 continue;
993 if (limits[j].max < num[iftype])
994 goto cont;
995 limits[j].max -= num[iftype];
996 }
997 }
998 /* yay, it fits */
999 kfree(limits);
1000 return 0;
1001 cont:
1002 kfree(limits);
1003 }
1004
1005 return -EBUSY;
1006 }
1007
1008 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1009 const u8 *rates, unsigned int n_rates,
1010 u32 *mask)
1011 {
1012 int i, j;
1013
1014 if (!sband)
1015 return -EINVAL;
1016
1017 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1018 return -EINVAL;
1019
1020 *mask = 0;
1021
1022 for (i = 0; i < n_rates; i++) {
1023 int rate = (rates[i] & 0x7f) * 5;
1024 bool found = false;
1025
1026 for (j = 0; j < sband->n_bitrates; j++) {
1027 if (sband->bitrates[j].bitrate == rate) {
1028 found = true;
1029 *mask |= BIT(j);
1030 break;
1031 }
1032 }
1033 if (!found)
1034 return -EINVAL;
1035 }
1036
1037 /*
1038 * mask must have at least one bit set here since we
1039 * didn't accept a 0-length rates array nor allowed
1040 * entries in the array that didn't exist
1041 */
1042
1043 return 0;
1044 }
1045
1046 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1047 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1048 const unsigned char rfc1042_header[] __aligned(2) =
1049 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1050 EXPORT_SYMBOL(rfc1042_header);
1051
1052 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1053 const unsigned char bridge_tunnel_header[] __aligned(2) =
1054 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1055 EXPORT_SYMBOL(bridge_tunnel_header);