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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[deliverable/linux.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 */
bc3b2d7f 6#include <linux/export.h>
d3236553 7#include <linux/bitops.h>
e31a16d6 8#include <linux/etherdevice.h>
5a0e3ad6 9#include <linux/slab.h>
d3236553 10#include <net/cfg80211.h>
e31a16d6 11#include <net/ip.h>
b156579b 12#include <net/dsfield.h>
8318d78a
JB		 13#include "core.h"
14
bd815252
JB		 15struct ieee80211_rate *
16ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
881d948c 17 u32 basic_rates, int bitrate)
bd815252
JB		 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}
32EXPORT_SYMBOL(ieee80211_get_response_rate);
33
59eb21a6 34int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
8318d78a 35{
59eb21a6
BR		 36 /* see 802.11 17.3.8.3.2 and Annex J
37 * there are overlapping channel numbers in 5GHz and 2GHz bands */
3a0c52a6
VK		 38 if (chan <= 0)
39 return 0; /* not supported */
40 switch (band) {
41 case IEEE80211_BAND_2GHZ:
59eb21a6
BR		 42 if (chan == 14)
43 return 2484;
44 else if (chan < 14)
45 return 2407 + chan * 5;
3a0c52a6
VK		 46 break;
47 case IEEE80211_BAND_5GHZ:
48 if (chan >= 182 && chan <= 196)
49 return 4000 + chan * 5;
59eb21a6 50 else
3a0c52a6
VK		 51 return 5000 + chan * 5;
52 break;
53 case IEEE80211_BAND_60GHZ:
54 if (chan < 5)
55 return 56160 + chan * 2160;
56 break;
57 default:
58 ;
59eb21a6 59 }
3a0c52a6 60 return 0; /* not supported */
8318d78a
JB		 61}
62EXPORT_SYMBOL(ieee80211_channel_to_frequency);
63
64int ieee80211_frequency_to_channel(int freq)
65{
59eb21a6 66 /* see 802.11 17.3.8.3.2 and Annex J */
8318d78a
JB		 67 if (freq == 2484)
68 return 14;
59eb21a6 69 else if (freq < 2484)
8318d78a 70 return (freq - 2407) / 5;
59eb21a6
BR		 71 else if (freq >= 4910 && freq <= 4980)
72 return (freq - 4000) / 5;
3a0c52a6 73 else if (freq <= 45000) /* DMG band lower limit */
59eb21a6 74 return (freq - 5000) / 5;
3a0c52a6
VK		 75 else if (freq >= 58320 && freq <= 64800)
76 return (freq - 56160) / 2160;
77 else
78 return 0;
8318d78a
JB		 79}
80EXPORT_SYMBOL(ieee80211_frequency_to_channel);
81
6c507cd0
JB		 82struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
83 int freq)
906c730a
JB		 84{
85 enum ieee80211_band band;
86 struct ieee80211_supported_band *sband;
87 int i;
88
89 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
90 sband = wiphy->bands[band];
91
92 if (!sband)
93 continue;
94
95 for (i = 0; i < sband->n_channels; i++) {
96 if (sband->channels[i].center_freq == freq)
97 return &sband->channels[i];
98 }
99 }
100
101 return NULL;
102}
6c507cd0 103EXPORT_SYMBOL(__ieee80211_get_channel);
906c730a 104
8318d78a
JB		 105static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
106 enum ieee80211_band band)
107{
108 int i, want;
109
110 switch (band) {
111 case IEEE80211_BAND_5GHZ:
112 want = 3;
113 for (i = 0; i < sband->n_bitrates; i++) {
114 if (sband->bitrates[i].bitrate == 60 ||
115 sband->bitrates[i].bitrate == 120 ||
116 sband->bitrates[i].bitrate == 240) {
117 sband->bitrates[i].flags |=
118 IEEE80211_RATE_MANDATORY_A;
119 want--;
120 }
121 }
122 WARN_ON(want);
123 break;
124 case IEEE80211_BAND_2GHZ:
125 want = 7;
126 for (i = 0; i < sband->n_bitrates; i++) {
127 if (sband->bitrates[i].bitrate == 10) {
128 sband->bitrates[i].flags |=
129 IEEE80211_RATE_MANDATORY_B |
130 IEEE80211_RATE_MANDATORY_G;
131 want--;
132 }
133
134 if (sband->bitrates[i].bitrate == 20 ||
135 sband->bitrates[i].bitrate == 55 ||
136 sband->bitrates[i].bitrate == 110 ||
137 sband->bitrates[i].bitrate == 60 ||
138 sband->bitrates[i].bitrate == 120 ||
139 sband->bitrates[i].bitrate == 240) {
140 sband->bitrates[i].flags |=
141 IEEE80211_RATE_MANDATORY_G;
142 want--;
143 }
144
aac09fbf
JB		 145 if (sband->bitrates[i].bitrate != 10 &&
146 sband->bitrates[i].bitrate != 20 &&
147 sband->bitrates[i].bitrate != 55 &&
148 sband->bitrates[i].bitrate != 110)
8318d78a
JB		 149 sband->bitrates[i].flags |=
150 IEEE80211_RATE_ERP_G;
151 }
406f2388 152 WARN_ON(want != 0 && want != 3 && want != 6);
8318d78a 153 break;
3a0c52a6
VK		 154 case IEEE80211_BAND_60GHZ:
155 /* check for mandatory HT MCS 1..4 */
156 WARN_ON(!sband->ht_cap.ht_supported);
157 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
158 break;
8318d78a
JB		 159 case IEEE80211_NUM_BANDS:
160 WARN_ON(1);
161 break;
162 }
163}
164
165void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
166{
167 enum ieee80211_band band;
168
169 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
170 if (wiphy->bands[band])
171 set_mandatory_flags_band(wiphy->bands[band], band);
172}
08645126 173
38ba3c57
JM		 174bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
175{
176 int i;
177 for (i = 0; i < wiphy->n_cipher_suites; i++)
178 if (cipher == wiphy->cipher_suites[i])
179 return true;
180 return false;
181}
182
fffd0934
JB		 183int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
184 struct key_params *params, int key_idx,
e31b8213 185 bool pairwise, const u8 *mac_addr)
08645126
JB		 186{
187 if (key_idx > 5)
188 return -EINVAL;
189
e31b8213
JB		 190 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
191 return -EINVAL;
192
193 if (pairwise && !mac_addr)
194 return -EINVAL;
195
08645126
JB		 196 /*
197 * Disallow pairwise keys with non-zero index unless it's WEP
45cbad6a
JO		 198 * or a vendor specific cipher (because current deployments use
199 * pairwise WEP keys with non-zero indices and for vendor specific
200 * ciphers this should be validated in the driver or hardware level
201 * - but 802.11i clearly specifies to use zero)
08645126 202 */
e31b8213 203 if (pairwise && key_idx &&
45cbad6a
JO		 204 ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
205 (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
206 (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
08645126
JB		 207 return -EINVAL;
208
08645126
JB		 209 switch (params->cipher) {
210 case WLAN_CIPHER_SUITE_WEP40:
8fc0fee0 211 if (params->key_len != WLAN_KEY_LEN_WEP40)
08645126
JB		 212 return -EINVAL;
213 break;
214 case WLAN_CIPHER_SUITE_TKIP:
8fc0fee0 215 if (params->key_len != WLAN_KEY_LEN_TKIP)
08645126
JB		 216 return -EINVAL;
217 break;
218 case WLAN_CIPHER_SUITE_CCMP:
8fc0fee0 219 if (params->key_len != WLAN_KEY_LEN_CCMP)
08645126
JB		 220 return -EINVAL;
221 break;
222 case WLAN_CIPHER_SUITE_WEP104:
8fc0fee0 223 if (params->key_len != WLAN_KEY_LEN_WEP104)
08645126
JB		 224 return -EINVAL;
225 break;
226 case WLAN_CIPHER_SUITE_AES_CMAC:
8fc0fee0 227 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
08645126
JB		 228 return -EINVAL;
229 break;
230 default:
7d64b7cc
JB		 231 /*
232 * We don't know anything about this algorithm,
233 * allow using it -- but the driver must check
234 * all parameters! We still check below whether
235 * or not the driver supports this algorithm,
236 * of course.
237 */
238 break;
08645126
JB		 239 }
240
9f26a952
JM		 241 if (params->seq) {
242 switch (params->cipher) {
243 case WLAN_CIPHER_SUITE_WEP40:
244 case WLAN_CIPHER_SUITE_WEP104:
245 /* These ciphers do not use key sequence */
246 return -EINVAL;
247 case WLAN_CIPHER_SUITE_TKIP:
248 case WLAN_CIPHER_SUITE_CCMP:
249 case WLAN_CIPHER_SUITE_AES_CMAC:
250 if (params->seq_len != 6)
251 return -EINVAL;
252 break;
253 }
254 }
255
38ba3c57 256 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
fffd0934
JB		 257 return -EINVAL;
258
08645126
JB		 259 return 0;
260}
e31a16d6 261
633adf1a 262unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
e31a16d6
ZY		 263{
264 unsigned int hdrlen = 24;
265
266 if (ieee80211_is_data(fc)) {
267 if (ieee80211_has_a4(fc))
268 hdrlen = 30;
d0dd2de0 269 if (ieee80211_is_data_qos(fc)) {
e31a16d6 270 hdrlen += IEEE80211_QOS_CTL_LEN;
d0dd2de0
AT		 271 if (ieee80211_has_order(fc))
272 hdrlen += IEEE80211_HT_CTL_LEN;
273 }
e31a16d6
ZY		 274 goto out;
275 }
276
277 if (ieee80211_is_ctl(fc)) {
278 /*
279 * ACK and CTS are 10 bytes, all others 16. To see how
280 * to get this condition consider
281 * subtype mask: 0b0000000011110000 (0x00F0)
282 * ACK subtype: 0b0000000011010000 (0x00D0)
283 * CTS subtype: 0b0000000011000000 (0x00C0)
284 * bits that matter: ^^^ (0x00E0)
285 * value of those: 0b0000000011000000 (0x00C0)
286 */
287 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
288 hdrlen = 10;
289 else
290 hdrlen = 16;
291 }
292out:
293 return hdrlen;
294}
295EXPORT_SYMBOL(ieee80211_hdrlen);
296
297unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
298{
299 const struct ieee80211_hdr *hdr =
300 (const struct ieee80211_hdr *)skb->data;
301 unsigned int hdrlen;
302
303 if (unlikely(skb->len < 10))
304 return 0;
305 hdrlen = ieee80211_hdrlen(hdr->frame_control);
306 if (unlikely(hdrlen > skb->len))
307 return 0;
308 return hdrlen;
309}
310EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
311
9b395bc3 312unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
e31a16d6
ZY		 313{
314 int ae = meshhdr->flags & MESH_FLAGS_AE;
7dd111e8 315 /* 802.11-2012, 8.2.4.7.3 */
e31a16d6 316 switch (ae) {
7dd111e8 317 default:
e31a16d6
ZY		 318 case 0:
319 return 6;
3c5772a5 320 case MESH_FLAGS_AE_A4:
e31a16d6 321 return 12;
3c5772a5 322 case MESH_FLAGS_AE_A5_A6:
e31a16d6 323 return 18;
e31a16d6
ZY		 324 }
325}
9b395bc3 326EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
e31a16d6 327
eaf85ca7 328int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
e31a16d6
ZY		 329 enum nl80211_iftype iftype)
330{
331 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
332 u16 hdrlen, ethertype;
333 u8 *payload;
334 u8 dst[ETH_ALEN];
335 u8 src[ETH_ALEN] __aligned(2);
336
337 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
338 return -1;
339
340 hdrlen = ieee80211_hdrlen(hdr->frame_control);
341
342 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
343 * header
344 * IEEE 802.11 address fields:
345 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
346 * 0 0 DA SA BSSID n/a
347 * 0 1 DA BSSID SA n/a
348 * 1 0 BSSID SA DA n/a
349 * 1 1 RA TA DA SA
350 */
351 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
352 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
353
354 switch (hdr->frame_control &
355 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
356 case cpu_to_le16(IEEE80211_FCTL_TODS):
357 if (unlikely(iftype != NL80211_IFTYPE_AP &&
074ac8df
JB		 358 iftype != NL80211_IFTYPE_AP_VLAN &&
359 iftype != NL80211_IFTYPE_P2P_GO))
e31a16d6
ZY		 360 return -1;
361 break;
362 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
363 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
f14543ee
FF		 364 iftype != NL80211_IFTYPE_MESH_POINT &&
365 iftype != NL80211_IFTYPE_AP_VLAN &&
366 iftype != NL80211_IFTYPE_STATION))
e31a16d6
ZY		 367 return -1;
368 if (iftype == NL80211_IFTYPE_MESH_POINT) {
369 struct ieee80211s_hdr *meshdr =
370 (struct ieee80211s_hdr *) (skb->data + hdrlen);
e3cf8b3f
ZY		 371 /* make sure meshdr->flags is on the linear part */
372 if (!pskb_may_pull(skb, hdrlen + 1))
373 return -1;
7dd111e8
JB		 374 if (meshdr->flags & MESH_FLAGS_AE_A4)
375 return -1;
e31a16d6 376 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
e3cf8b3f
ZY		 377 skb_copy_bits(skb, hdrlen +
378 offsetof(struct ieee80211s_hdr, eaddr1),
379 dst, ETH_ALEN);
380 skb_copy_bits(skb, hdrlen +
381 offsetof(struct ieee80211s_hdr, eaddr2),
382 src, ETH_ALEN);
e31a16d6 383 }
e3cf8b3f 384 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
e31a16d6
ZY		 385 }
386 break;
387 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
3c5772a5 388 if ((iftype != NL80211_IFTYPE_STATION &&
074ac8df
JB		 389 iftype != NL80211_IFTYPE_P2P_CLIENT &&
390 iftype != NL80211_IFTYPE_MESH_POINT) ||
e31a16d6 391 (is_multicast_ether_addr(dst) &&
4c764729 392 ether_addr_equal(src, addr)))
e31a16d6 393 return -1;
3c5772a5
JC		 394 if (iftype == NL80211_IFTYPE_MESH_POINT) {
395 struct ieee80211s_hdr *meshdr =
396 (struct ieee80211s_hdr *) (skb->data + hdrlen);
e3cf8b3f
ZY		 397 /* make sure meshdr->flags is on the linear part */
398 if (!pskb_may_pull(skb, hdrlen + 1))
399 return -1;
7dd111e8
JB		 400 if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
401 return -1;
3c5772a5 402 if (meshdr->flags & MESH_FLAGS_AE_A4)
e3cf8b3f
ZY		 403 skb_copy_bits(skb, hdrlen +
404 offsetof(struct ieee80211s_hdr, eaddr1),
405 src, ETH_ALEN);
406 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
3c5772a5 407 }
e31a16d6
ZY		 408 break;
409 case cpu_to_le16(0):
941c93cd
AN		 410 if (iftype != NL80211_IFTYPE_ADHOC &&
411 iftype != NL80211_IFTYPE_STATION)
412 return -1;
e31a16d6
ZY		 413 break;
414 }
415
e3cf8b3f 416 if (!pskb_may_pull(skb, hdrlen + 8))
e31a16d6
ZY		 417 return -1;
418
419 payload = skb->data + hdrlen;
420 ethertype = (payload[6] << 8) | payload[7];
421
4c764729 422 if (likely((ether_addr_equal(payload, rfc1042_header) &&
e31a16d6 423 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
4c764729 424 ether_addr_equal(payload, bridge_tunnel_header))) {
e31a16d6
ZY		 425 /* remove RFC1042 or Bridge-Tunnel encapsulation and
426 * replace EtherType */
427 skb_pull(skb, hdrlen + 6);
428 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
429 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
430 } else {
431 struct ethhdr *ehdr;
432 __be16 len;
433
434 skb_pull(skb, hdrlen);
435 len = htons(skb->len);
436 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
437 memcpy(ehdr->h_dest, dst, ETH_ALEN);
438 memcpy(ehdr->h_source, src, ETH_ALEN);
439 ehdr->h_proto = len;
440 }
441 return 0;
442}
443EXPORT_SYMBOL(ieee80211_data_to_8023);
444
eaf85ca7 445int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
e31a16d6
ZY		 446 enum nl80211_iftype iftype, u8 *bssid, bool qos)
447{
448 struct ieee80211_hdr hdr;
449 u16 hdrlen, ethertype;
450 __le16 fc;
451 const u8 *encaps_data;
452 int encaps_len, skip_header_bytes;
453 int nh_pos, h_pos;
454 int head_need;
455
456 if (unlikely(skb->len < ETH_HLEN))
457 return -EINVAL;
458
459 nh_pos = skb_network_header(skb) - skb->data;
460 h_pos = skb_transport_header(skb) - skb->data;
461
462 /* convert Ethernet header to proper 802.11 header (based on
463 * operation mode) */
464 ethertype = (skb->data[12] << 8) | skb->data[13];
465 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
466
467 switch (iftype) {
468 case NL80211_IFTYPE_AP:
469 case NL80211_IFTYPE_AP_VLAN:
074ac8df 470 case NL80211_IFTYPE_P2P_GO:
e31a16d6
ZY		 471 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
472 /* DA BSSID SA */
473 memcpy(hdr.addr1, skb->data, ETH_ALEN);
474 memcpy(hdr.addr2, addr, ETH_ALEN);
475 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
476 hdrlen = 24;
477 break;
478 case NL80211_IFTYPE_STATION:
074ac8df 479 case NL80211_IFTYPE_P2P_CLIENT:
e31a16d6
ZY		 480 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
481 /* BSSID SA DA */
482 memcpy(hdr.addr1, bssid, ETH_ALEN);
483 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
484 memcpy(hdr.addr3, skb->data, ETH_ALEN);
485 hdrlen = 24;
486 break;
487 case NL80211_IFTYPE_ADHOC:
488 /* DA SA BSSID */
489 memcpy(hdr.addr1, skb->data, ETH_ALEN);
490 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
491 memcpy(hdr.addr3, bssid, ETH_ALEN);
492 hdrlen = 24;
493 break;
494 default:
495 return -EOPNOTSUPP;
496 }
497
498 if (qos) {
499 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
500 hdrlen += 2;
501 }
502
503 hdr.frame_control = fc;
504 hdr.duration_id = 0;
505 hdr.seq_ctrl = 0;
506
507 skip_header_bytes = ETH_HLEN;
508 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
509 encaps_data = bridge_tunnel_header;
510 encaps_len = sizeof(bridge_tunnel_header);
511 skip_header_bytes -= 2;
512 } else if (ethertype > 0x600) {
513 encaps_data = rfc1042_header;
514 encaps_len = sizeof(rfc1042_header);
515 skip_header_bytes -= 2;
516 } else {
517 encaps_data = NULL;
518 encaps_len = 0;
519 }
520
521 skb_pull(skb, skip_header_bytes);
522 nh_pos -= skip_header_bytes;
523 h_pos -= skip_header_bytes;
524
525 head_need = hdrlen + encaps_len - skb_headroom(skb);
526
527 if (head_need > 0 || skb_cloned(skb)) {
528 head_need = max(head_need, 0);
529 if (head_need)
530 skb_orphan(skb);
531
24616152 532 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
e31a16d6 533 return -ENOMEM;
24616152 534
e31a16d6
ZY		 535 skb->truesize += head_need;
536 }
537
538 if (encaps_data) {
539 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
540 nh_pos += encaps_len;
541 h_pos += encaps_len;
542 }
543
544 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
545
546 nh_pos += hdrlen;
547 h_pos += hdrlen;
548
549 /* Update skb pointers to various headers since this modified frame
550 * is going to go through Linux networking code that may potentially
551 * need things like pointer to IP header. */
552 skb_set_mac_header(skb, 0);
553 skb_set_network_header(skb, nh_pos);
554 skb_set_transport_header(skb, h_pos);
555
556 return 0;
557}
558EXPORT_SYMBOL(ieee80211_data_from_8023);
559
eaf85ca7
ZY		 560
561void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
562 const u8 *addr, enum nl80211_iftype iftype,
8b3becad
YAP		 563 const unsigned int extra_headroom,
564 bool has_80211_header)
eaf85ca7
ZY		 565{
566 struct sk_buff *frame = NULL;
567 u16 ethertype;
568 u8 *payload;
569 const struct ethhdr *eth;
570 int remaining, err;
571 u8 dst[ETH_ALEN], src[ETH_ALEN];
572
8b3becad
YAP		 573 if (has_80211_header) {
574 err = ieee80211_data_to_8023(skb, addr, iftype);
575 if (err)
576 goto out;
eaf85ca7 577
8b3becad
YAP		 578 /* skip the wrapping header */
579 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
580 if (!eth)
581 goto out;
582 } else {
583 eth = (struct ethhdr *) skb->data;
584 }
eaf85ca7
ZY		 585
586 while (skb != frame) {
587 u8 padding;
588 __be16 len = eth->h_proto;
589 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
590
591 remaining = skb->len;
592 memcpy(dst, eth->h_dest, ETH_ALEN);
593 memcpy(src, eth->h_source, ETH_ALEN);
594
595 padding = (4 - subframe_len) & 0x3;
596 /* the last MSDU has no padding */
597 if (subframe_len > remaining)
598 goto purge;
599
600 skb_pull(skb, sizeof(struct ethhdr));
601 /* reuse skb for the last subframe */
602 if (remaining <= subframe_len + padding)
603 frame = skb;
604 else {
605 unsigned int hlen = ALIGN(extra_headroom, 4);
606 /*
607 * Allocate and reserve two bytes more for payload
608 * alignment since sizeof(struct ethhdr) is 14.
609 */
610 frame = dev_alloc_skb(hlen + subframe_len + 2);
611 if (!frame)
612 goto purge;
613
614 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
615 memcpy(skb_put(frame, ntohs(len)), skb->data,
616 ntohs(len));
617
618 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
619 padding);
620 if (!eth) {
621 dev_kfree_skb(frame);
622 goto purge;
623 }
624 }
625
626 skb_reset_network_header(frame);
627 frame->dev = skb->dev;
628 frame->priority = skb->priority;
629
630 payload = frame->data;
631 ethertype = (payload[6] << 8) | payload[7];
632
ac422d3c 633 if (likely((ether_addr_equal(payload, rfc1042_header) &&
eaf85ca7 634 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
ac422d3c 635 ether_addr_equal(payload, bridge_tunnel_header))) {
eaf85ca7
ZY		 636 /* remove RFC1042 or Bridge-Tunnel
637 * encapsulation and replace EtherType */
638 skb_pull(frame, 6);
639 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
640 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
641 } else {
642 memcpy(skb_push(frame, sizeof(__be16)), &len,
643 sizeof(__be16));
644 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
645 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
646 }
647 __skb_queue_tail(list, frame);
648 }
649
650 return;
651
652 purge:
653 __skb_queue_purge(list);
654 out:
655 dev_kfree_skb(skb);
656}
657EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
658
e31a16d6
ZY		 659/* Given a data frame determine the 802.1p/1d tag to use. */
660unsigned int cfg80211_classify8021d(struct sk_buff *skb)
661{
662 unsigned int dscp;
663
664 /* skb->priority values from 256->263 are magic values to
665 * directly indicate a specific 802.1d priority. This is used
666 * to allow 802.1d priority to be passed directly in from VLAN
667 * tags, etc.
668 */
669 if (skb->priority >= 256 && skb->priority <= 263)
670 return skb->priority - 256;
671
672 switch (skb->protocol) {
673 case htons(ETH_P_IP):
b156579b
DT		 674 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
675 break;
676 case htons(ETH_P_IPV6):
677 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
e31a16d6
ZY		 678 break;
679 default:
680 return 0;
681 }
682
683 return dscp >> 5;
684}
685EXPORT_SYMBOL(cfg80211_classify8021d);
517357c6
JB		 686
687const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
688{
e2176892 689 if (bss->information_elements == NULL)
517357c6 690 return NULL;
e2176892
VK		 691 return cfg80211_find_ie(ie, bss->information_elements,
692 bss->len_information_elements);
517357c6
JB		 693}
694EXPORT_SYMBOL(ieee80211_bss_get_ie);
fffd0934
JB		 695
696void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
697{
698 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
699 struct net_device *dev = wdev->netdev;
700 int i;
701
702 if (!wdev->connect_keys)
703 return;
704
705 for (i = 0; i < 6; i++) {
706 if (!wdev->connect_keys->params[i].cipher)
707 continue;
e31b8213 708 if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL,
1e056665 709 &wdev->connect_keys->params[i])) {
e9c0268f 710 netdev_err(dev, "failed to set key %d\n", i);
1e056665
ZY		 711 continue;
712 }
fffd0934 713 if (wdev->connect_keys->def == i)
dbd2fd65
JB		 714 if (rdev->ops->set_default_key(wdev->wiphy, dev,
715 i, true, true)) {
e9c0268f 716 netdev_err(dev, "failed to set defkey %d\n", i);
1e056665
ZY		 717 continue;
718 }
fffd0934
JB		 719 if (wdev->connect_keys->defmgmt == i)
720 if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
e9c0268f 721 netdev_err(dev, "failed to set mgtdef %d\n", i);
fffd0934
JB		 722 }
723
724 kfree(wdev->connect_keys);
725 wdev->connect_keys = NULL;
726}
3d54d255 727
1f6fc43e 728void cfg80211_process_wdev_events(struct wireless_dev *wdev)
3d54d255
JB		 729{
730 struct cfg80211_event *ev;
731 unsigned long flags;
732 const u8 *bssid = NULL;
733
734 spin_lock_irqsave(&wdev->event_lock, flags);
735 while (!list_empty(&wdev->event_list)) {
736 ev = list_first_entry(&wdev->event_list,
737 struct cfg80211_event, list);
738 list_del(&ev->list);
739 spin_unlock_irqrestore(&wdev->event_lock, flags);
740
741 wdev_lock(wdev);
742 switch (ev->type) {
743 case EVENT_CONNECT_RESULT:
744 if (!is_zero_ether_addr(ev->cr.bssid))
745 bssid = ev->cr.bssid;
746 __cfg80211_connect_result(
747 wdev->netdev, bssid,
748 ev->cr.req_ie, ev->cr.req_ie_len,
749 ev->cr.resp_ie, ev->cr.resp_ie_len,
750 ev->cr.status,
751 ev->cr.status == WLAN_STATUS_SUCCESS,
752 NULL);
753 break;
754 case EVENT_ROAMED:
adbde344
VT		 755 __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
756 ev->rm.req_ie_len, ev->rm.resp_ie,
757 ev->rm.resp_ie_len);
3d54d255
JB		 758 break;
759 case EVENT_DISCONNECTED:
760 __cfg80211_disconnected(wdev->netdev,
761 ev->dc.ie, ev->dc.ie_len,
762 ev->dc.reason, true);
763 break;
764 case EVENT_IBSS_JOINED:
765 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
766 break;
767 }
768 wdev_unlock(wdev);
769
770 kfree(ev);
771
772 spin_lock_irqsave(&wdev->event_lock, flags);
773 }
774 spin_unlock_irqrestore(&wdev->event_lock, flags);
775}
776
777void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
778{
779 struct wireless_dev *wdev;
780
781 ASSERT_RTNL();
782 ASSERT_RDEV_LOCK(rdev);
783
784 mutex_lock(&rdev->devlist_mtx);
785
89a54e48 786 list_for_each_entry(wdev, &rdev->wdev_list, list)
3d54d255
JB		 787 cfg80211_process_wdev_events(wdev);
788
789 mutex_unlock(&rdev->devlist_mtx);
790}
791
792int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
793 struct net_device *dev, enum nl80211_iftype ntype,
794 u32 *flags, struct vif_params *params)
795{
796 int err;
797 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
798
799 ASSERT_RDEV_LOCK(rdev);
800
801 /* don't support changing VLANs, you just re-create them */
802 if (otype == NL80211_IFTYPE_AP_VLAN)
803 return -EOPNOTSUPP;
804
98104fde
JB		 805 /* cannot change into P2P device type */
806 if (ntype == NL80211_IFTYPE_P2P_DEVICE)
807 return -EOPNOTSUPP;
808
3d54d255
JB		 809 if (!rdev->ops->change_virtual_intf ||
810 !(rdev->wiphy.interface_modes & (1 << ntype)))
811 return -EOPNOTSUPP;
812
ad4bb6f8 813 /* if it's part of a bridge, reject changing type to station/ibss */
f350a0a8 814 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
074ac8df
JB		 815 (ntype == NL80211_IFTYPE_ADHOC ||
816 ntype == NL80211_IFTYPE_STATION ||
817 ntype == NL80211_IFTYPE_P2P_CLIENT))
ad4bb6f8
JB		 818 return -EBUSY;
819
f8cdddb8 820 if (ntype != otype && netif_running(dev)) {
e4e32459 821 mutex_lock(&rdev->devlist_mtx);
7527a782
JB		 822 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
823 ntype);
e4e32459 824 mutex_unlock(&rdev->devlist_mtx);
7527a782
JB		 825 if (err)
826 return err;
827
9bc383de 828 dev->ieee80211_ptr->use_4addr = false;
29cbe68c 829 dev->ieee80211_ptr->mesh_id_up_len = 0;
9bc383de 830
3d54d255 831 switch (otype) {
ac800140
MK		 832 case NL80211_IFTYPE_AP:
833 cfg80211_stop_ap(rdev, dev);
834 break;
3d54d255
JB		 835 case NL80211_IFTYPE_ADHOC:
836 cfg80211_leave_ibss(rdev, dev, false);
837 break;
838 case NL80211_IFTYPE_STATION:
074ac8df 839 case NL80211_IFTYPE_P2P_CLIENT:
3d54d255
JB		 840 cfg80211_disconnect(rdev, dev,
841 WLAN_REASON_DEAUTH_LEAVING, true);
842 break;
843 case NL80211_IFTYPE_MESH_POINT:
844 /* mesh should be handled? */
845 break;
846 default:
847 break;
848 }
849
850 cfg80211_process_rdev_events(rdev);
851 }
852
853 err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
854 ntype, flags, params);
855
856 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
857
9bc383de
JB		 858 if (!err && params && params->use_4addr != -1)
859 dev->ieee80211_ptr->use_4addr = params->use_4addr;
860
ad4bb6f8
JB		 861 if (!err) {
862 dev->priv_flags &= ~IFF_DONT_BRIDGE;
863 switch (ntype) {
864 case NL80211_IFTYPE_STATION:
865 if (dev->ieee80211_ptr->use_4addr)
866 break;
867 /* fall through */
074ac8df 868 case NL80211_IFTYPE_P2P_CLIENT:
ad4bb6f8
JB		 869 case NL80211_IFTYPE_ADHOC:
870 dev->priv_flags |= IFF_DONT_BRIDGE;
871 break;
074ac8df 872 case NL80211_IFTYPE_P2P_GO:
ad4bb6f8
JB		 873 case NL80211_IFTYPE_AP:
874 case NL80211_IFTYPE_AP_VLAN:
875 case NL80211_IFTYPE_WDS:
876 case NL80211_IFTYPE_MESH_POINT:
877 /* bridging OK */
878 break;
879 case NL80211_IFTYPE_MONITOR:
880 /* monitor can't bridge anyway */
881 break;
882 case NL80211_IFTYPE_UNSPECIFIED:
2e161f78 883 case NUM_NL80211_IFTYPES:
ad4bb6f8
JB		 884 /* not happening */
885 break;
98104fde
JB		 886 case NL80211_IFTYPE_P2P_DEVICE:
887 WARN_ON(1);
888 break;
ad4bb6f8
JB		 889 }
890 }
891
dbbae26a
MK		 892 if (!err && ntype != otype && netif_running(dev)) {
893 cfg80211_update_iface_num(rdev, ntype, 1);
894 cfg80211_update_iface_num(rdev, otype, -1);
895 }
896
3d54d255
JB		 897 return err;
898}
254416aa 899
95ddc1fc
VK		 900static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
901{
902 static const u32 __mcs2bitrate[] = {
903 /* control PHY */
904 [0] = 275,
905 /* SC PHY */
906 [1] = 3850,
907 [2] = 7700,
908 [3] = 9625,
909 [4] = 11550,
910 [5] = 12512, /* 1251.25 mbps */
911 [6] = 15400,
912 [7] = 19250,
913 [8] = 23100,
914 [9] = 25025,
915 [10] = 30800,
916 [11] = 38500,
917 [12] = 46200,
918 /* OFDM PHY */
919 [13] = 6930,
920 [14] = 8662, /* 866.25 mbps */
921 [15] = 13860,
922 [16] = 17325,
923 [17] = 20790,
924 [18] = 27720,
925 [19] = 34650,
926 [20] = 41580,
927 [21] = 45045,
928 [22] = 51975,
929 [23] = 62370,
930 [24] = 67568, /* 6756.75 mbps */
931 /* LP-SC PHY */
932 [25] = 6260,
933 [26] = 8340,
934 [27] = 11120,
935 [28] = 12510,
936 [29] = 16680,
937 [30] = 22240,
938 [31] = 25030,
939 };
940
941 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
942 return 0;
943
944 return __mcs2bitrate[rate->mcs];
945}
946
8eb41c8d 947u32 cfg80211_calculate_bitrate(struct rate_info *rate)
254416aa
JL		 948{
949 int modulation, streams, bitrate;
950
951 if (!(rate->flags & RATE_INFO_FLAGS_MCS))
952 return rate->legacy;
95ddc1fc
VK		 953 if (rate->flags & RATE_INFO_FLAGS_60G)
954 return cfg80211_calculate_bitrate_60g(rate);
254416aa
JL		 955
956 /* the formula below does only work for MCS values smaller than 32 */
2615f375 957 if (WARN_ON_ONCE(rate->mcs >= 32))
254416aa
JL		 958 return 0;
959
960 modulation = rate->mcs & 7;
961 streams = (rate->mcs >> 3) + 1;
962
963 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
964 13500000 : 6500000;
965
966 if (modulation < 4)
967 bitrate *= (modulation + 1);
968 else if (modulation == 4)
969 bitrate *= (modulation + 2);
970 else
971 bitrate *= (modulation + 3);
972
973 bitrate *= streams;
974
975 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
976 bitrate = (bitrate / 9) * 10;
977
978 /* do NOT round down here */
979 return (bitrate + 50000) / 100000;
980}
8097e149 981EXPORT_SYMBOL(cfg80211_calculate_bitrate);
56d1893d
JB		 982
983int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
984 u32 beacon_int)
985{
986 struct wireless_dev *wdev;
987 int res = 0;
988
989 if (!beacon_int)
990 return -EINVAL;
991
992 mutex_lock(&rdev->devlist_mtx);
993
89a54e48 994 list_for_each_entry(wdev, &rdev->wdev_list, list) {
56d1893d
JB		 995 if (!wdev->beacon_interval)
996 continue;
997 if (wdev->beacon_interval != beacon_int) {
998 res = -EINVAL;
999 break;
1000 }
1001 }
1002
1003 mutex_unlock(&rdev->devlist_mtx);
1004
1005 return res;
1006}
7527a782 1007
d4e50c59
MK		 1008int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1009 struct wireless_dev *wdev,
1010 enum nl80211_iftype iftype,
1011 struct ieee80211_channel *chan,
1012 enum cfg80211_chan_mode chanmode)
7527a782
JB		 1013{
1014 struct wireless_dev *wdev_iter;
463454b5 1015 u32 used_iftypes = BIT(iftype);
7527a782 1016 int num[NUM_NL80211_IFTYPES];
d4e50c59
MK		 1017 struct ieee80211_channel
1018 *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1019 struct ieee80211_channel *ch;
1020 enum cfg80211_chan_mode chmode;
1021 int num_different_channels = 0;
7527a782
JB		 1022 int total = 1;
1023 int i, j;
1024
1025 ASSERT_RTNL();
e4e32459 1026 lockdep_assert_held(&rdev->devlist_mtx);
7527a782
JB		 1027
1028 /* Always allow software iftypes */
1029 if (rdev->wiphy.software_iftypes & BIT(iftype))
1030 return 0;
1031
7527a782 1032 memset(num, 0, sizeof(num));
d4e50c59 1033 memset(used_channels, 0, sizeof(used_channels));
7527a782
JB		 1034
1035 num[iftype] = 1;
1036
d4e50c59
MK		 1037 switch (chanmode) {
1038 case CHAN_MODE_UNDEFINED:
1039 break;
1040 case CHAN_MODE_SHARED:
1041 WARN_ON(!chan);
1042 used_channels[0] = chan;
1043 num_different_channels++;
1044 break;
1045 case CHAN_MODE_EXCLUSIVE:
1046 num_different_channels++;
1047 break;
1048 }
1049
89a54e48 1050 list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
7527a782
JB		 1051 if (wdev_iter == wdev)
1052 continue;
98104fde
JB		 1053 if (wdev_iter->netdev) {
1054 if (!netif_running(wdev_iter->netdev))
1055 continue;
1056 } else if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1057 if (!wdev_iter->p2p_started)
1058 continue;
1059 } else {
1060 WARN_ON(1);
1061 }
7527a782
JB		 1062
1063 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1064 continue;
1065
8e95ea49
JB		 1066 /*
1067 * We may be holding the "wdev" mutex, but now need to lock
1068 * wdev_iter. This is OK because once we get here wdev_iter
1069 * is not wdev (tested above), but we need to use the nested
1070 * locking for lockdep.
1071 */
1072 mutex_lock_nested(&wdev_iter->mtx, 1);
1073 __acquire(wdev_iter->mtx);
1074 cfg80211_get_chan_state(wdev_iter, &ch, &chmode);
1075 wdev_unlock(wdev_iter);
d4e50c59
MK		 1076
1077 switch (chmode) {
1078 case CHAN_MODE_UNDEFINED:
1079 break;
1080 case CHAN_MODE_SHARED:
1081 for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1082 if (!used_channels[i] || used_channels[i] == ch)
1083 break;
1084
e4e32459 1085 if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
d4e50c59 1086 return -EBUSY;
d4e50c59
MK		 1087
1088 if (used_channels[i] == NULL) {
1089 used_channels[i] = ch;
1090 num_different_channels++;
1091 }
1092 break;
1093 case CHAN_MODE_EXCLUSIVE:
1094 num_different_channels++;
1095 break;
1096 }
1097
7527a782
JB		 1098 num[wdev_iter->iftype]++;
1099 total++;
463454b5 1100 used_iftypes |= BIT(wdev_iter->iftype);
7527a782 1101 }
7527a782 1102
8e8b41f9
JB		 1103 if (total == 1)
1104 return 0;
1105
7527a782
JB		 1106 for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
1107 const struct ieee80211_iface_combination *c;
1108 struct ieee80211_iface_limit *limits;
463454b5 1109 u32 all_iftypes = 0;
7527a782
JB		 1110
1111 c = &rdev->wiphy.iface_combinations[i];
1112
d4e50c59
MK		 1113 if (total > c->max_interfaces)
1114 continue;
1115 if (num_different_channels > c->num_different_channels)
1116 continue;
1117
7527a782
JB		 1118 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1119 GFP_KERNEL);
1120 if (!limits)
1121 return -ENOMEM;
7527a782
JB		 1122
1123 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1124 if (rdev->wiphy.software_iftypes & BIT(iftype))
1125 continue;
1126 for (j = 0; j < c->n_limits; j++) {
463454b5 1127 all_iftypes |= limits[j].types;
e55a4046 1128 if (!(limits[j].types & BIT(iftype)))
7527a782
JB		 1129 continue;
1130 if (limits[j].max < num[iftype])
1131 goto cont;
1132 limits[j].max -= num[iftype];
1133 }
1134 }
463454b5
JB		 1135
1136 /*
1137 * Finally check that all iftypes that we're currently
1138 * using are actually part of this combination. If they
1139 * aren't then we can't use this combination and have
1140 * to continue to the next.
1141 */
1142 if ((all_iftypes & used_iftypes) != used_iftypes)
1143 goto cont;
1144
1145 /*
1146 * This combination covered all interface types and
1147 * supported the requested numbers, so we're good.
1148 */
7527a782
JB		 1149 kfree(limits);
1150 return 0;
1151 cont:
1152 kfree(limits);
1153 }
1154
1155 return -EBUSY;
1156}
34850ab2
JB		 1157
1158int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1159 const u8 *rates, unsigned int n_rates,
1160 u32 *mask)
1161{
1162 int i, j;
1163
a401d2bb
JB		 1164 if (!sband)
1165 return -EINVAL;
1166
34850ab2
JB		 1167 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1168 return -EINVAL;
1169
1170 *mask = 0;
1171
1172 for (i = 0; i < n_rates; i++) {
1173 int rate = (rates[i] & 0x7f) * 5;
1174 bool found = false;
1175
1176 for (j = 0; j < sband->n_bitrates; j++) {
1177 if (sband->bitrates[j].bitrate == rate) {
1178 found = true;
1179 *mask |= BIT(j);
1180 break;
1181 }
1182 }
1183 if (!found)
1184 return -EINVAL;
1185 }
1186
1187 /*
1188 * mask must have at least one bit set here since we
1189 * didn't accept a 0-length rates array nor allowed
1190 * entries in the array that didn't exist
1191 */
1192
1193 return 0;
1194}
11a2a357
JB		 1195
1196/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1197/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1198const unsigned char rfc1042_header[] __aligned(2) =
1199 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1200EXPORT_SYMBOL(rfc1042_header);
1201
1202/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1203const unsigned char bridge_tunnel_header[] __aligned(2) =
1204 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1205EXPORT_SYMBOL(bridge_tunnel_header);
Linux kernel - Deliverables
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