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carl9170: use ieee80211_free_txskb
[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 */
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
59eb21a6 32int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
8318d78a 33{
59eb21a6
BR		 34 /* see 802.11 17.3.8.3.2 and Annex J
35 * there are overlapping channel numbers in 5GHz and 2GHz bands */
36 if (band == IEEE80211_BAND_5GHZ) {
37 if (chan >= 182 && chan <= 196)
38 return 4000 + chan * 5;
39 else
40 return 5000 + chan * 5;
41 } else { /* IEEE80211_BAND_2GHZ */
42 if (chan == 14)
43 return 2484;
44 else if (chan < 14)
45 return 2407 + chan * 5;
46 else
47 return 0; /* not supported */
48 }
8318d78a
JB		 49}
50EXPORT_SYMBOL(ieee80211_channel_to_frequency);
51
52int ieee80211_frequency_to_channel(int freq)
53{
59eb21a6 54 /* see 802.11 17.3.8.3.2 and Annex J */
8318d78a
JB		 55 if (freq == 2484)
56 return 14;
59eb21a6 57 else if (freq < 2484)
8318d78a 58 return (freq - 2407) / 5;
59eb21a6
BR		 59 else if (freq >= 4910 && freq <= 4980)
60 return (freq - 4000) / 5;
61 else
62 return (freq - 5000) / 5;
8318d78a
JB		 63}
64EXPORT_SYMBOL(ieee80211_frequency_to_channel);
65
6c507cd0
JB		 66struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
67 int freq)
906c730a
JB		 68{
69 enum ieee80211_band band;
70 struct ieee80211_supported_band *sband;
71 int i;
72
73 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
74 sband = wiphy->bands[band];
75
76 if (!sband)
77 continue;
78
79 for (i = 0; i < sband->n_channels; i++) {
80 if (sband->channels[i].center_freq == freq)
81 return &sband->channels[i];
82 }
83 }
84
85 return NULL;
86}
6c507cd0 87EXPORT_SYMBOL(__ieee80211_get_channel);
906c730a 88
8318d78a
JB		 89static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
90 enum ieee80211_band band)
91{
92 int i, want;
93
94 switch (band) {
95 case IEEE80211_BAND_5GHZ:
96 want = 3;
97 for (i = 0; i < sband->n_bitrates; i++) {
98 if (sband->bitrates[i].bitrate == 60 ||
99 sband->bitrates[i].bitrate == 120 ||
100 sband->bitrates[i].bitrate == 240) {
101 sband->bitrates[i].flags |=
102 IEEE80211_RATE_MANDATORY_A;
103 want--;
104 }
105 }
106 WARN_ON(want);
107 break;
108 case IEEE80211_BAND_2GHZ:
109 want = 7;
110 for (i = 0; i < sband->n_bitrates; i++) {
111 if (sband->bitrates[i].bitrate == 10) {
112 sband->bitrates[i].flags |=
113 IEEE80211_RATE_MANDATORY_B |
114 IEEE80211_RATE_MANDATORY_G;
115 want--;
116 }
117
118 if (sband->bitrates[i].bitrate == 20 ||
119 sband->bitrates[i].bitrate == 55 ||
120 sband->bitrates[i].bitrate == 110 ||
121 sband->bitrates[i].bitrate == 60 ||
122 sband->bitrates[i].bitrate == 120 ||
123 sband->bitrates[i].bitrate == 240) {
124 sband->bitrates[i].flags |=
125 IEEE80211_RATE_MANDATORY_G;
126 want--;
127 }
128
aac09fbf
JB		 129 if (sband->bitrates[i].bitrate != 10 &&
130 sband->bitrates[i].bitrate != 20 &&
131 sband->bitrates[i].bitrate != 55 &&
132 sband->bitrates[i].bitrate != 110)
8318d78a
JB		 133 sband->bitrates[i].flags |=
134 IEEE80211_RATE_ERP_G;
135 }
406f2388 136 WARN_ON(want != 0 && want != 3 && want != 6);
8318d78a
JB		 137 break;
138 case IEEE80211_NUM_BANDS:
139 WARN_ON(1);
140 break;
141 }
142}
143
144void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
145{
146 enum ieee80211_band band;
147
148 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
149 if (wiphy->bands[band])
150 set_mandatory_flags_band(wiphy->bands[band], band);
151}
08645126 152
38ba3c57
JM		 153bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
154{
155 int i;
156 for (i = 0; i < wiphy->n_cipher_suites; i++)
157 if (cipher == wiphy->cipher_suites[i])
158 return true;
159 return false;
160}
161
fffd0934
JB		 162int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
163 struct key_params *params, int key_idx,
e31b8213 164 bool pairwise, const u8 *mac_addr)
08645126
JB		 165{
166 if (key_idx > 5)
167 return -EINVAL;
168
e31b8213
JB		 169 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
170 return -EINVAL;
171
172 if (pairwise && !mac_addr)
173 return -EINVAL;
174
08645126
JB		 175 /*
176 * Disallow pairwise keys with non-zero index unless it's WEP
45cbad6a
JO		 177 * or a vendor specific cipher (because current deployments use
178 * pairwise WEP keys with non-zero indices and for vendor specific
179 * ciphers this should be validated in the driver or hardware level
180 * - but 802.11i clearly specifies to use zero)
08645126 181 */
e31b8213 182 if (pairwise && key_idx &&
45cbad6a
JO		 183 ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
184 (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
185 (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
08645126
JB		 186 return -EINVAL;
187
08645126
JB		 188 switch (params->cipher) {
189 case WLAN_CIPHER_SUITE_WEP40:
8fc0fee0 190 if (params->key_len != WLAN_KEY_LEN_WEP40)
08645126
JB		 191 return -EINVAL;
192 break;
193 case WLAN_CIPHER_SUITE_TKIP:
8fc0fee0 194 if (params->key_len != WLAN_KEY_LEN_TKIP)
08645126
JB		 195 return -EINVAL;
196 break;
197 case WLAN_CIPHER_SUITE_CCMP:
8fc0fee0 198 if (params->key_len != WLAN_KEY_LEN_CCMP)
08645126
JB		 199 return -EINVAL;
200 break;
201 case WLAN_CIPHER_SUITE_WEP104:
8fc0fee0 202 if (params->key_len != WLAN_KEY_LEN_WEP104)
08645126
JB		 203 return -EINVAL;
204 break;
205 case WLAN_CIPHER_SUITE_AES_CMAC:
8fc0fee0 206 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
08645126
JB		 207 return -EINVAL;
208 break;
209 default:
7d64b7cc
JB		 210 /*
211 * We don't know anything about this algorithm,
212 * allow using it -- but the driver must check
213 * all parameters! We still check below whether
214 * or not the driver supports this algorithm,
215 * of course.
216 */
217 break;
08645126
JB		 218 }
219
9f26a952
JM		 220 if (params->seq) {
221 switch (params->cipher) {
222 case WLAN_CIPHER_SUITE_WEP40:
223 case WLAN_CIPHER_SUITE_WEP104:
224 /* These ciphers do not use key sequence */
225 return -EINVAL;
226 case WLAN_CIPHER_SUITE_TKIP:
227 case WLAN_CIPHER_SUITE_CCMP:
228 case WLAN_CIPHER_SUITE_AES_CMAC:
229 if (params->seq_len != 6)
230 return -EINVAL;
231 break;
232 }
233 }
234
38ba3c57 235 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
fffd0934
JB		 236 return -EINVAL;
237
08645126
JB		 238 return 0;
239}
e31a16d6
ZY		 240
241/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
242/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
243const unsigned char rfc1042_header[] __aligned(2) =
244 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
245EXPORT_SYMBOL(rfc1042_header);
246
247/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
248const unsigned char bridge_tunnel_header[] __aligned(2) =
249 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
250EXPORT_SYMBOL(bridge_tunnel_header);
251
633adf1a 252unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
e31a16d6
ZY		 253{
254 unsigned int hdrlen = 24;
255
256 if (ieee80211_is_data(fc)) {
257 if (ieee80211_has_a4(fc))
258 hdrlen = 30;
d0dd2de0 259 if (ieee80211_is_data_qos(fc)) {
e31a16d6 260 hdrlen += IEEE80211_QOS_CTL_LEN;
d0dd2de0
AT		 261 if (ieee80211_has_order(fc))
262 hdrlen += IEEE80211_HT_CTL_LEN;
263 }
e31a16d6
ZY		 264 goto out;
265 }
266
267 if (ieee80211_is_ctl(fc)) {
268 /*
269 * ACK and CTS are 10 bytes, all others 16. To see how
270 * to get this condition consider
271 * subtype mask: 0b0000000011110000 (0x00F0)
272 * ACK subtype: 0b0000000011010000 (0x00D0)
273 * CTS subtype: 0b0000000011000000 (0x00C0)
274 * bits that matter: ^^^ (0x00E0)
275 * value of those: 0b0000000011000000 (0x00C0)
276 */
277 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
278 hdrlen = 10;
279 else
280 hdrlen = 16;
281 }
282out:
283 return hdrlen;
284}
285EXPORT_SYMBOL(ieee80211_hdrlen);
286
287unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
288{
289 const struct ieee80211_hdr *hdr =
290 (const struct ieee80211_hdr *)skb->data;
291 unsigned int hdrlen;
292
293 if (unlikely(skb->len < 10))
294 return 0;
295 hdrlen = ieee80211_hdrlen(hdr->frame_control);
296 if (unlikely(hdrlen > skb->len))
297 return 0;
298 return hdrlen;
299}
300EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
301
60fd2b67 302static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
e31a16d6
ZY		 303{
304 int ae = meshhdr->flags & MESH_FLAGS_AE;
305 /* 7.1.3.5a.2 */
306 switch (ae) {
307 case 0:
308 return 6;
3c5772a5 309 case MESH_FLAGS_AE_A4:
e31a16d6 310 return 12;
3c5772a5 311 case MESH_FLAGS_AE_A5_A6:
e31a16d6 312 return 18;
3c5772a5 313 case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
e31a16d6
ZY		 314 return 24;
315 default:
316 return 6;
317 }
318}
319
eaf85ca7 320int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
e31a16d6
ZY		 321 enum nl80211_iftype iftype)
322{
323 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
324 u16 hdrlen, ethertype;
325 u8 *payload;
326 u8 dst[ETH_ALEN];
327 u8 src[ETH_ALEN] __aligned(2);
328
329 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
330 return -1;
331
332 hdrlen = ieee80211_hdrlen(hdr->frame_control);
333
334 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
335 * header
336 * IEEE 802.11 address fields:
337 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
338 * 0 0 DA SA BSSID n/a
339 * 0 1 DA BSSID SA n/a
340 * 1 0 BSSID SA DA n/a
341 * 1 1 RA TA DA SA
342 */
343 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
344 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
345
346 switch (hdr->frame_control &
347 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
348 case cpu_to_le16(IEEE80211_FCTL_TODS):
349 if (unlikely(iftype != NL80211_IFTYPE_AP &&
074ac8df
JB		 350 iftype != NL80211_IFTYPE_AP_VLAN &&
351 iftype != NL80211_IFTYPE_P2P_GO))
e31a16d6
ZY		 352 return -1;
353 break;
354 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
355 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
f14543ee
FF		 356 iftype != NL80211_IFTYPE_MESH_POINT &&
357 iftype != NL80211_IFTYPE_AP_VLAN &&
358 iftype != NL80211_IFTYPE_STATION))
e31a16d6
ZY		 359 return -1;
360 if (iftype == NL80211_IFTYPE_MESH_POINT) {
361 struct ieee80211s_hdr *meshdr =
362 (struct ieee80211s_hdr *) (skb->data + hdrlen);
e3cf8b3f
ZY		 363 /* make sure meshdr->flags is on the linear part */
364 if (!pskb_may_pull(skb, hdrlen + 1))
365 return -1;
e31a16d6 366 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
e3cf8b3f
ZY		 367 skb_copy_bits(skb, hdrlen +
368 offsetof(struct ieee80211s_hdr, eaddr1),
369 dst, ETH_ALEN);
370 skb_copy_bits(skb, hdrlen +
371 offsetof(struct ieee80211s_hdr, eaddr2),
372 src, ETH_ALEN);
e31a16d6 373 }
e3cf8b3f 374 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
e31a16d6
ZY		 375 }
376 break;
377 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
3c5772a5 378 if ((iftype != NL80211_IFTYPE_STATION &&
074ac8df
JB		 379 iftype != NL80211_IFTYPE_P2P_CLIENT &&
380 iftype != NL80211_IFTYPE_MESH_POINT) ||
e31a16d6
ZY		 381 (is_multicast_ether_addr(dst) &&
382 !compare_ether_addr(src, addr)))
383 return -1;
3c5772a5
JC		 384 if (iftype == NL80211_IFTYPE_MESH_POINT) {
385 struct ieee80211s_hdr *meshdr =
386 (struct ieee80211s_hdr *) (skb->data + hdrlen);
e3cf8b3f
ZY		 387 /* make sure meshdr->flags is on the linear part */
388 if (!pskb_may_pull(skb, hdrlen + 1))
389 return -1;
3c5772a5 390 if (meshdr->flags & MESH_FLAGS_AE_A4)
e3cf8b3f
ZY		 391 skb_copy_bits(skb, hdrlen +
392 offsetof(struct ieee80211s_hdr, eaddr1),
393 src, ETH_ALEN);
394 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
3c5772a5 395 }
e31a16d6
ZY		 396 break;
397 case cpu_to_le16(0):
941c93cd
AN		 398 if (iftype != NL80211_IFTYPE_ADHOC &&
399 iftype != NL80211_IFTYPE_STATION)
400 return -1;
e31a16d6
ZY		 401 break;
402 }
403
e3cf8b3f 404 if (!pskb_may_pull(skb, hdrlen + 8))
e31a16d6
ZY		 405 return -1;
406
407 payload = skb->data + hdrlen;
408 ethertype = (payload[6] << 8) | payload[7];
409
410 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
411 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
412 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
413 /* remove RFC1042 or Bridge-Tunnel encapsulation and
414 * replace EtherType */
415 skb_pull(skb, hdrlen + 6);
416 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
417 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
418 } else {
419 struct ethhdr *ehdr;
420 __be16 len;
421
422 skb_pull(skb, hdrlen);
423 len = htons(skb->len);
424 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
425 memcpy(ehdr->h_dest, dst, ETH_ALEN);
426 memcpy(ehdr->h_source, src, ETH_ALEN);
427 ehdr->h_proto = len;
428 }
429 return 0;
430}
431EXPORT_SYMBOL(ieee80211_data_to_8023);
432
eaf85ca7 433int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
e31a16d6
ZY		 434 enum nl80211_iftype iftype, u8 *bssid, bool qos)
435{
436 struct ieee80211_hdr hdr;
437 u16 hdrlen, ethertype;
438 __le16 fc;
439 const u8 *encaps_data;
440 int encaps_len, skip_header_bytes;
441 int nh_pos, h_pos;
442 int head_need;
443
444 if (unlikely(skb->len < ETH_HLEN))
445 return -EINVAL;
446
447 nh_pos = skb_network_header(skb) - skb->data;
448 h_pos = skb_transport_header(skb) - skb->data;
449
450 /* convert Ethernet header to proper 802.11 header (based on
451 * operation mode) */
452 ethertype = (skb->data[12] << 8) | skb->data[13];
453 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
454
455 switch (iftype) {
456 case NL80211_IFTYPE_AP:
457 case NL80211_IFTYPE_AP_VLAN:
074ac8df 458 case NL80211_IFTYPE_P2P_GO:
e31a16d6
ZY		 459 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
460 /* DA BSSID SA */
461 memcpy(hdr.addr1, skb->data, ETH_ALEN);
462 memcpy(hdr.addr2, addr, ETH_ALEN);
463 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
464 hdrlen = 24;
465 break;
466 case NL80211_IFTYPE_STATION:
074ac8df 467 case NL80211_IFTYPE_P2P_CLIENT:
e31a16d6
ZY		 468 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
469 /* BSSID SA DA */
470 memcpy(hdr.addr1, bssid, ETH_ALEN);
471 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
472 memcpy(hdr.addr3, skb->data, ETH_ALEN);
473 hdrlen = 24;
474 break;
475 case NL80211_IFTYPE_ADHOC:
476 /* DA SA BSSID */
477 memcpy(hdr.addr1, skb->data, ETH_ALEN);
478 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
479 memcpy(hdr.addr3, bssid, ETH_ALEN);
480 hdrlen = 24;
481 break;
482 default:
483 return -EOPNOTSUPP;
484 }
485
486 if (qos) {
487 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
488 hdrlen += 2;
489 }
490
491 hdr.frame_control = fc;
492 hdr.duration_id = 0;
493 hdr.seq_ctrl = 0;
494
495 skip_header_bytes = ETH_HLEN;
496 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
497 encaps_data = bridge_tunnel_header;
498 encaps_len = sizeof(bridge_tunnel_header);
499 skip_header_bytes -= 2;
500 } else if (ethertype > 0x600) {
501 encaps_data = rfc1042_header;
502 encaps_len = sizeof(rfc1042_header);
503 skip_header_bytes -= 2;
504 } else {
505 encaps_data = NULL;
506 encaps_len = 0;
507 }
508
509 skb_pull(skb, skip_header_bytes);
510 nh_pos -= skip_header_bytes;
511 h_pos -= skip_header_bytes;
512
513 head_need = hdrlen + encaps_len - skb_headroom(skb);
514
515 if (head_need > 0 || skb_cloned(skb)) {
516 head_need = max(head_need, 0);
517 if (head_need)
518 skb_orphan(skb);
519
24616152 520 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
e31a16d6 521 return -ENOMEM;
24616152 522
e31a16d6
ZY		 523 skb->truesize += head_need;
524 }
525
526 if (encaps_data) {
527 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
528 nh_pos += encaps_len;
529 h_pos += encaps_len;
530 }
531
532 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
533
534 nh_pos += hdrlen;
535 h_pos += hdrlen;
536
537 /* Update skb pointers to various headers since this modified frame
538 * is going to go through Linux networking code that may potentially
539 * need things like pointer to IP header. */
540 skb_set_mac_header(skb, 0);
541 skb_set_network_header(skb, nh_pos);
542 skb_set_transport_header(skb, h_pos);
543
544 return 0;
545}
546EXPORT_SYMBOL(ieee80211_data_from_8023);
547
eaf85ca7
ZY		 548
549void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
550 const u8 *addr, enum nl80211_iftype iftype,
8b3becad
YAP		 551 const unsigned int extra_headroom,
552 bool has_80211_header)
eaf85ca7
ZY		 553{
554 struct sk_buff *frame = NULL;
555 u16 ethertype;
556 u8 *payload;
557 const struct ethhdr *eth;
558 int remaining, err;
559 u8 dst[ETH_ALEN], src[ETH_ALEN];
560
8b3becad
YAP		 561 if (has_80211_header) {
562 err = ieee80211_data_to_8023(skb, addr, iftype);
563 if (err)
564 goto out;
eaf85ca7 565
8b3becad
YAP		 566 /* skip the wrapping header */
567 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
568 if (!eth)
569 goto out;
570 } else {
571 eth = (struct ethhdr *) skb->data;
572 }
eaf85ca7
ZY		 573
574 while (skb != frame) {
575 u8 padding;
576 __be16 len = eth->h_proto;
577 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
578
579 remaining = skb->len;
580 memcpy(dst, eth->h_dest, ETH_ALEN);
581 memcpy(src, eth->h_source, ETH_ALEN);
582
583 padding = (4 - subframe_len) & 0x3;
584 /* the last MSDU has no padding */
585 if (subframe_len > remaining)
586 goto purge;
587
588 skb_pull(skb, sizeof(struct ethhdr));
589 /* reuse skb for the last subframe */
590 if (remaining <= subframe_len + padding)
591 frame = skb;
592 else {
593 unsigned int hlen = ALIGN(extra_headroom, 4);
594 /*
595 * Allocate and reserve two bytes more for payload
596 * alignment since sizeof(struct ethhdr) is 14.
597 */
598 frame = dev_alloc_skb(hlen + subframe_len + 2);
599 if (!frame)
600 goto purge;
601
602 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
603 memcpy(skb_put(frame, ntohs(len)), skb->data,
604 ntohs(len));
605
606 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
607 padding);
608 if (!eth) {
609 dev_kfree_skb(frame);
610 goto purge;
611 }
612 }
613
614 skb_reset_network_header(frame);
615 frame->dev = skb->dev;
616 frame->priority = skb->priority;
617
618 payload = frame->data;
619 ethertype = (payload[6] << 8) | payload[7];
620
621 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
622 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
623 compare_ether_addr(payload,
624 bridge_tunnel_header) == 0)) {
625 /* remove RFC1042 or Bridge-Tunnel
626 * encapsulation and replace EtherType */
627 skb_pull(frame, 6);
628 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
629 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
630 } else {
631 memcpy(skb_push(frame, sizeof(__be16)), &len,
632 sizeof(__be16));
633 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
634 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
635 }
636 __skb_queue_tail(list, frame);
637 }
638
639 return;
640
641 purge:
642 __skb_queue_purge(list);
643 out:
644 dev_kfree_skb(skb);
645}
646EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
647
e31a16d6
ZY		 648/* Given a data frame determine the 802.1p/1d tag to use. */
649unsigned int cfg80211_classify8021d(struct sk_buff *skb)
650{
651 unsigned int dscp;
652
653 /* skb->priority values from 256->263 are magic values to
654 * directly indicate a specific 802.1d priority. This is used
655 * to allow 802.1d priority to be passed directly in from VLAN
656 * tags, etc.
657 */
658 if (skb->priority >= 256 && skb->priority <= 263)
659 return skb->priority - 256;
660
661 switch (skb->protocol) {
662 case htons(ETH_P_IP):
663 dscp = ip_hdr(skb)->tos & 0xfc;
664 break;
665 default:
666 return 0;
667 }
668
669 return dscp >> 5;
670}
671EXPORT_SYMBOL(cfg80211_classify8021d);
517357c6
JB		 672
673const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
674{
675 u8 *end, *pos;
676
677 pos = bss->information_elements;
678 if (pos == NULL)
679 return NULL;
680 end = pos + bss->len_information_elements;
681
682 while (pos + 1 < end) {
683 if (pos + 2 + pos[1] > end)
684 break;
685 if (pos[0] == ie)
686 return pos;
687 pos += 2 + pos[1];
688 }
689
690 return NULL;
691}
692EXPORT_SYMBOL(ieee80211_bss_get_ie);
fffd0934
JB		 693
694void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
695{
696 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
697 struct net_device *dev = wdev->netdev;
698 int i;
699
700 if (!wdev->connect_keys)
701 return;
702
703 for (i = 0; i < 6; i++) {
704 if (!wdev->connect_keys->params[i].cipher)
705 continue;
e31b8213 706 if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL,
1e056665 707 &wdev->connect_keys->params[i])) {
e9c0268f 708 netdev_err(dev, "failed to set key %d\n", i);
1e056665
ZY		 709 continue;
710 }
fffd0934 711 if (wdev->connect_keys->def == i)
dbd2fd65
JB		 712 if (rdev->ops->set_default_key(wdev->wiphy, dev,
713 i, true, true)) {
e9c0268f 714 netdev_err(dev, "failed to set defkey %d\n", i);
1e056665
ZY		 715 continue;
716 }
fffd0934
JB		 717 if (wdev->connect_keys->defmgmt == i)
718 if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
e9c0268f 719 netdev_err(dev, "failed to set mgtdef %d\n", i);
fffd0934
JB		 720 }
721
722 kfree(wdev->connect_keys);
723 wdev->connect_keys = NULL;
724}
3d54d255
JB		 725
726static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
727{
728 struct cfg80211_event *ev;
729 unsigned long flags;
730 const u8 *bssid = NULL;
731
732 spin_lock_irqsave(&wdev->event_lock, flags);
733 while (!list_empty(&wdev->event_list)) {
734 ev = list_first_entry(&wdev->event_list,
735 struct cfg80211_event, list);
736 list_del(&ev->list);
737 spin_unlock_irqrestore(&wdev->event_lock, flags);
738
739 wdev_lock(wdev);
740 switch (ev->type) {
741 case EVENT_CONNECT_RESULT:
742 if (!is_zero_ether_addr(ev->cr.bssid))
743 bssid = ev->cr.bssid;
744 __cfg80211_connect_result(
745 wdev->netdev, bssid,
746 ev->cr.req_ie, ev->cr.req_ie_len,
747 ev->cr.resp_ie, ev->cr.resp_ie_len,
748 ev->cr.status,
749 ev->cr.status == WLAN_STATUS_SUCCESS,
750 NULL);
751 break;
752 case EVENT_ROAMED:
ed9d0102 753 __cfg80211_roamed(wdev, ev->rm.channel, ev->rm.bssid,
3d54d255
JB		 754 ev->rm.req_ie, ev->rm.req_ie_len,
755 ev->rm.resp_ie, ev->rm.resp_ie_len);
756 break;
757 case EVENT_DISCONNECTED:
758 __cfg80211_disconnected(wdev->netdev,
759 ev->dc.ie, ev->dc.ie_len,
760 ev->dc.reason, true);
761 break;
762 case EVENT_IBSS_JOINED:
763 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
764 break;
765 }
766 wdev_unlock(wdev);
767
768 kfree(ev);
769
770 spin_lock_irqsave(&wdev->event_lock, flags);
771 }
772 spin_unlock_irqrestore(&wdev->event_lock, flags);
773}
774
775void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
776{
777 struct wireless_dev *wdev;
778
779 ASSERT_RTNL();
780 ASSERT_RDEV_LOCK(rdev);
781
782 mutex_lock(&rdev->devlist_mtx);
783
784 list_for_each_entry(wdev, &rdev->netdev_list, list)
785 cfg80211_process_wdev_events(wdev);
786
787 mutex_unlock(&rdev->devlist_mtx);
788}
789
790int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
791 struct net_device *dev, enum nl80211_iftype ntype,
792 u32 *flags, struct vif_params *params)
793{
794 int err;
795 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
796
797 ASSERT_RDEV_LOCK(rdev);
798
799 /* don't support changing VLANs, you just re-create them */
800 if (otype == NL80211_IFTYPE_AP_VLAN)
801 return -EOPNOTSUPP;
802
803 if (!rdev->ops->change_virtual_intf ||
804 !(rdev->wiphy.interface_modes & (1 << ntype)))
805 return -EOPNOTSUPP;
806
ad4bb6f8 807 /* if it's part of a bridge, reject changing type to station/ibss */
f350a0a8 808 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
074ac8df
JB		 809 (ntype == NL80211_IFTYPE_ADHOC ||
810 ntype == NL80211_IFTYPE_STATION ||
811 ntype == NL80211_IFTYPE_P2P_CLIENT))
ad4bb6f8
JB		 812 return -EBUSY;
813
3d54d255 814 if (ntype != otype) {
7527a782
JB		 815 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
816 ntype);
817 if (err)
818 return err;
819
9bc383de 820 dev->ieee80211_ptr->use_4addr = false;
29cbe68c 821 dev->ieee80211_ptr->mesh_id_up_len = 0;
9bc383de 822
3d54d255
JB		 823 switch (otype) {
824 case NL80211_IFTYPE_ADHOC:
825 cfg80211_leave_ibss(rdev, dev, false);
826 break;
827 case NL80211_IFTYPE_STATION:
074ac8df 828 case NL80211_IFTYPE_P2P_CLIENT:
3d54d255
JB		 829 cfg80211_disconnect(rdev, dev,
830 WLAN_REASON_DEAUTH_LEAVING, true);
831 break;
832 case NL80211_IFTYPE_MESH_POINT:
833 /* mesh should be handled? */
834 break;
835 default:
836 break;
837 }
838
839 cfg80211_process_rdev_events(rdev);
840 }
841
842 err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
843 ntype, flags, params);
844
845 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
846
9bc383de
JB		 847 if (!err && params && params->use_4addr != -1)
848 dev->ieee80211_ptr->use_4addr = params->use_4addr;
849
ad4bb6f8
JB		 850 if (!err) {
851 dev->priv_flags &= ~IFF_DONT_BRIDGE;
852 switch (ntype) {
853 case NL80211_IFTYPE_STATION:
854 if (dev->ieee80211_ptr->use_4addr)
855 break;
856 /* fall through */
074ac8df 857 case NL80211_IFTYPE_P2P_CLIENT:
ad4bb6f8
JB		 858 case NL80211_IFTYPE_ADHOC:
859 dev->priv_flags |= IFF_DONT_BRIDGE;
860 break;
074ac8df 861 case NL80211_IFTYPE_P2P_GO:
ad4bb6f8
JB		 862 case NL80211_IFTYPE_AP:
863 case NL80211_IFTYPE_AP_VLAN:
864 case NL80211_IFTYPE_WDS:
865 case NL80211_IFTYPE_MESH_POINT:
866 /* bridging OK */
867 break;
868 case NL80211_IFTYPE_MONITOR:
869 /* monitor can't bridge anyway */
870 break;
871 case NL80211_IFTYPE_UNSPECIFIED:
2e161f78 872 case NUM_NL80211_IFTYPES:
ad4bb6f8
JB		 873 /* not happening */
874 break;
875 }
876 }
877
3d54d255
JB		 878 return err;
879}
254416aa
JL		 880
881u16 cfg80211_calculate_bitrate(struct rate_info *rate)
882{
883 int modulation, streams, bitrate;
884
885 if (!(rate->flags & RATE_INFO_FLAGS_MCS))
886 return rate->legacy;
887
888 /* the formula below does only work for MCS values smaller than 32 */
889 if (rate->mcs >= 32)
890 return 0;
891
892 modulation = rate->mcs & 7;
893 streams = (rate->mcs >> 3) + 1;
894
895 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
896 13500000 : 6500000;
897
898 if (modulation < 4)
899 bitrate *= (modulation + 1);
900 else if (modulation == 4)
901 bitrate *= (modulation + 2);
902 else
903 bitrate *= (modulation + 3);
904
905 bitrate *= streams;
906
907 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
908 bitrate = (bitrate / 9) * 10;
909
910 /* do NOT round down here */
911 return (bitrate + 50000) / 100000;
912}
56d1893d
JB		 913
914int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
915 u32 beacon_int)
916{
917 struct wireless_dev *wdev;
918 int res = 0;
919
920 if (!beacon_int)
921 return -EINVAL;
922
923 mutex_lock(&rdev->devlist_mtx);
924
925 list_for_each_entry(wdev, &rdev->netdev_list, list) {
926 if (!wdev->beacon_interval)
927 continue;
928 if (wdev->beacon_interval != beacon_int) {
929 res = -EINVAL;
930 break;
931 }
932 }
933
934 mutex_unlock(&rdev->devlist_mtx);
935
936 return res;
937}
7527a782
JB		 938
939int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
940 struct wireless_dev *wdev,
941 enum nl80211_iftype iftype)
942{
943 struct wireless_dev *wdev_iter;
944 int num[NUM_NL80211_IFTYPES];
945 int total = 1;
946 int i, j;
947
948 ASSERT_RTNL();
949
950 /* Always allow software iftypes */
951 if (rdev->wiphy.software_iftypes & BIT(iftype))
952 return 0;
953
954 /*
955 * Drivers will gradually all set this flag, until all
956 * have it we only enforce for those that set it.
957 */
958 if (!(rdev->wiphy.flags & WIPHY_FLAG_ENFORCE_COMBINATIONS))
959 return 0;
960
961 memset(num, 0, sizeof(num));
962
963 num[iftype] = 1;
964
965 mutex_lock(&rdev->devlist_mtx);
966 list_for_each_entry(wdev_iter, &rdev->netdev_list, list) {
967 if (wdev_iter == wdev)
968 continue;
969 if (!netif_running(wdev_iter->netdev))
970 continue;
971
972 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
973 continue;
974
975 num[wdev_iter->iftype]++;
976 total++;
977 }
978 mutex_unlock(&rdev->devlist_mtx);
979
980 for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
981 const struct ieee80211_iface_combination *c;
982 struct ieee80211_iface_limit *limits;
983
984 c = &rdev->wiphy.iface_combinations[i];
985
986 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
987 GFP_KERNEL);
988 if (!limits)
989 return -ENOMEM;
990 if (total > c->max_interfaces)
991 goto cont;
992
993 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
994 if (rdev->wiphy.software_iftypes & BIT(iftype))
995 continue;
996 for (j = 0; j < c->n_limits; j++) {
997 if (!(limits[j].types & iftype))
998 continue;
999 if (limits[j].max < num[iftype])
1000 goto cont;
1001 limits[j].max -= num[iftype];
1002 }
1003 }
1004 /* yay, it fits */
1005 kfree(limits);
1006 return 0;
1007 cont:
1008 kfree(limits);
1009 }
1010
1011 return -EBUSY;
1012}
34850ab2
JB		 1013
1014int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1015 const u8 *rates, unsigned int n_rates,
1016 u32 *mask)
1017{
1018 int i, j;
1019
a401d2bb
JB		 1020 if (!sband)
1021 return -EINVAL;
1022
34850ab2
JB		 1023 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1024 return -EINVAL;
1025
1026 *mask = 0;
1027
1028 for (i = 0; i < n_rates; i++) {
1029 int rate = (rates[i] & 0x7f) * 5;
1030 bool found = false;
1031
1032 for (j = 0; j < sband->n_bitrates; j++) {
1033 if (sband->bitrates[j].bitrate == rate) {
1034 found = true;
1035 *mask |= BIT(j);
1036 break;
1037 }
1038 }
1039 if (!found)
1040 return -EINVAL;
1041 }
1042
1043 /*
1044 * mask must have at least one bit set here since we
1045 * didn't accept a 0-length rates array nor allowed
1046 * entries in the array that didn't exist
1047 */
1048
1049 return 0;
1050}
Linux kernel - Deliverables
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