?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'pm-fixes' of git://github.com/rjwysocki/linux-pm
[linux-2.6/kvm.git] / net / wireless / util.c
blobbe75a3a0424eccdf31b895f8cb7e23eddb566a5b
1 /*
2 * Wireless utility functions
3 *
4 * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
5 */
6 #include <linux/bitops.h>
7 #include <linux/etherdevice.h>
8 #include <linux/slab.h>
9 #include <net/cfg80211.h>
10 #include <net/ip.h>
11 #include "core.h"
12
13 struct ieee80211_rate *
14 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
15 u32 basic_rates, int bitrate)
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 }
30 EXPORT_SYMBOL(ieee80211_get_response_rate);
31
32 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
33 {
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 }
49 }
50 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
51
52 int ieee80211_frequency_to_channel(int freq)
53 {
54 /* see 802.11 17.3.8.3.2 and Annex J */
55 if (freq == 2484)
56 return 14;
57 else if (freq < 2484)
58 return (freq - 2407) / 5;
59 else if (freq >= 4910 && freq <= 4980)
60 return (freq - 4000) / 5;
61 else
62 return (freq - 5000) / 5;
63 }
64 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
65
66 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
67 int freq)
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 }
87 EXPORT_SYMBOL(__ieee80211_get_channel);
88
89 static 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
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)
133 sband->bitrates[i].flags |=
134 IEEE80211_RATE_ERP_G;
135 }
136 WARN_ON(want != 0 && want != 3 && want != 6);
137 break;
138 case IEEE80211_NUM_BANDS:
139 WARN_ON(1);
140 break;
141 }
142 }
143
144 void 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 }
152
153 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
154 struct key_params *params, int key_idx,
155 bool pairwise, const u8 *mac_addr)
156 {
157 int i;
158
159 if (key_idx > 5)
160 return -EINVAL;
161
162 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
163 return -EINVAL;
164
165 if (pairwise && !mac_addr)
166 return -EINVAL;
167
168 /*
169 * Disallow pairwise keys with non-zero index unless it's WEP
170 * or a vendor specific cipher (because current deployments use
171 * pairwise WEP keys with non-zero indices and for vendor specific
172 * ciphers this should be validated in the driver or hardware level
173 * - but 802.11i clearly specifies to use zero)
174 */
175 if (pairwise && key_idx &&
176 ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
177 (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
178 (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
179 return -EINVAL;
180
181 switch (params->cipher) {
182 case WLAN_CIPHER_SUITE_WEP40:
183 if (params->key_len != WLAN_KEY_LEN_WEP40)
184 return -EINVAL;
185 break;
186 case WLAN_CIPHER_SUITE_TKIP:
187 if (params->key_len != WLAN_KEY_LEN_TKIP)
188 return -EINVAL;
189 break;
190 case WLAN_CIPHER_SUITE_CCMP:
191 if (params->key_len != WLAN_KEY_LEN_CCMP)
192 return -EINVAL;
193 break;
194 case WLAN_CIPHER_SUITE_WEP104:
195 if (params->key_len != WLAN_KEY_LEN_WEP104)
196 return -EINVAL;
197 break;
198 case WLAN_CIPHER_SUITE_AES_CMAC:
199 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
200 return -EINVAL;
201 break;
202 default:
203 /*
204 * We don't know anything about this algorithm,
205 * allow using it -- but the driver must check
206 * all parameters! We still check below whether
207 * or not the driver supports this algorithm,
208 * of course.
209 */
210 break;
211 }
212
213 if (params->seq) {
214 switch (params->cipher) {
215 case WLAN_CIPHER_SUITE_WEP40:
216 case WLAN_CIPHER_SUITE_WEP104:
217 /* These ciphers do not use key sequence */
218 return -EINVAL;
219 case WLAN_CIPHER_SUITE_TKIP:
220 case WLAN_CIPHER_SUITE_CCMP:
221 case WLAN_CIPHER_SUITE_AES_CMAC:
222 if (params->seq_len != 6)
223 return -EINVAL;
224 break;
225 }
226 }
227
228 for (i = 0; i < rdev->wiphy.n_cipher_suites; i++)
229 if (params->cipher == rdev->wiphy.cipher_suites[i])
230 break;
231 if (i == rdev->wiphy.n_cipher_suites)
232 return -EINVAL;
233
234 return 0;
235 }
236
237 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
238 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
239 const unsigned char rfc1042_header[] __aligned(2) =
240 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
241 EXPORT_SYMBOL(rfc1042_header);
242
243 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
244 const unsigned char bridge_tunnel_header[] __aligned(2) =
245 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
246 EXPORT_SYMBOL(bridge_tunnel_header);
247
248 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
249 {
250 unsigned int hdrlen = 24;
251
252 if (ieee80211_is_data(fc)) {
253 if (ieee80211_has_a4(fc))
254 hdrlen = 30;
255 if (ieee80211_is_data_qos(fc)) {
256 hdrlen += IEEE80211_QOS_CTL_LEN;
257 if (ieee80211_has_order(fc))
258 hdrlen += IEEE80211_HT_CTL_LEN;
259 }
260 goto out;
261 }
262
263 if (ieee80211_is_ctl(fc)) {
264 /*
265 * ACK and CTS are 10 bytes, all others 16. To see how
266 * to get this condition consider
267 * subtype mask: 0b0000000011110000 (0x00F0)
268 * ACK subtype: 0b0000000011010000 (0x00D0)
269 * CTS subtype: 0b0000000011000000 (0x00C0)
270 * bits that matter: ^^^ (0x00E0)
271 * value of those: 0b0000000011000000 (0x00C0)
272 */
273 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
274 hdrlen = 10;
275 else
276 hdrlen = 16;
277 }
278 out:
279 return hdrlen;
280 }
281 EXPORT_SYMBOL(ieee80211_hdrlen);
282
283 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
284 {
285 const struct ieee80211_hdr *hdr =
286 (const struct ieee80211_hdr *)skb->data;
287 unsigned int hdrlen;
288
289 if (unlikely(skb->len < 10))
290 return 0;
291 hdrlen = ieee80211_hdrlen(hdr->frame_control);
292 if (unlikely(hdrlen > skb->len))
293 return 0;
294 return hdrlen;
295 }
296 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
297
298 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
299 {
300 int ae = meshhdr->flags & MESH_FLAGS_AE;
301 /* 7.1.3.5a.2 */
302 switch (ae) {
303 case 0:
304 return 6;
305 case MESH_FLAGS_AE_A4:
306 return 12;
307 case MESH_FLAGS_AE_A5_A6:
308 return 18;
309 case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
310 return 24;
311 default:
312 return 6;
313 }
314 }
315
316 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
317 enum nl80211_iftype iftype)
318 {
319 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
320 u16 hdrlen, ethertype;
321 u8 *payload;
322 u8 dst[ETH_ALEN];
323 u8 src[ETH_ALEN] __aligned(2);
324
325 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
326 return -1;
327
328 hdrlen = ieee80211_hdrlen(hdr->frame_control);
329
330 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
331 * header
332 * IEEE 802.11 address fields:
333 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
334 * 0 0 DA SA BSSID n/a
335 * 0 1 DA BSSID SA n/a
336 * 1 0 BSSID SA DA n/a
337 * 1 1 RA TA DA SA
338 */
339 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
340 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
341
342 switch (hdr->frame_control &
343 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
344 case cpu_to_le16(IEEE80211_FCTL_TODS):
345 if (unlikely(iftype != NL80211_IFTYPE_AP &&
346 iftype != NL80211_IFTYPE_AP_VLAN &&
347 iftype != NL80211_IFTYPE_P2P_GO))
348 return -1;
349 break;
350 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
351 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
352 iftype != NL80211_IFTYPE_MESH_POINT &&
353 iftype != NL80211_IFTYPE_AP_VLAN &&
354 iftype != NL80211_IFTYPE_STATION))
355 return -1;
356 if (iftype == NL80211_IFTYPE_MESH_POINT) {
357 struct ieee80211s_hdr *meshdr =
358 (struct ieee80211s_hdr *) (skb->data + hdrlen);
359 /* make sure meshdr->flags is on the linear part */
360 if (!pskb_may_pull(skb, hdrlen + 1))
361 return -1;
362 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
363 skb_copy_bits(skb, hdrlen +
364 offsetof(struct ieee80211s_hdr, eaddr1),
365 dst, ETH_ALEN);
366 skb_copy_bits(skb, hdrlen +
367 offsetof(struct ieee80211s_hdr, eaddr2),
368 src, ETH_ALEN);
369 }
370 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
371 }
372 break;
373 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
374 if ((iftype != NL80211_IFTYPE_STATION &&
375 iftype != NL80211_IFTYPE_P2P_CLIENT &&
376 iftype != NL80211_IFTYPE_MESH_POINT) ||
377 (is_multicast_ether_addr(dst) &&
378 !compare_ether_addr(src, addr)))
379 return -1;
380 if (iftype == NL80211_IFTYPE_MESH_POINT) {
381 struct ieee80211s_hdr *meshdr =
382 (struct ieee80211s_hdr *) (skb->data + hdrlen);
383 /* make sure meshdr->flags is on the linear part */
384 if (!pskb_may_pull(skb, hdrlen + 1))
385 return -1;
386 if (meshdr->flags & MESH_FLAGS_AE_A4)
387 skb_copy_bits(skb, hdrlen +
388 offsetof(struct ieee80211s_hdr, eaddr1),
389 src, ETH_ALEN);
390 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
391 }
392 break;
393 case cpu_to_le16(0):
394 if (iftype != NL80211_IFTYPE_ADHOC)
395 return -1;
396 break;
397 }
398
399 if (!pskb_may_pull(skb, hdrlen + 8))
400 return -1;
401
402 payload = skb->data + hdrlen;
403 ethertype = (payload[6] << 8) | payload[7];
404
405 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
406 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
407 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
408 /* remove RFC1042 or Bridge-Tunnel encapsulation and
409 * replace EtherType */
410 skb_pull(skb, hdrlen + 6);
411 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
412 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
413 } else {
414 struct ethhdr *ehdr;
415 __be16 len;
416
417 skb_pull(skb, hdrlen);
418 len = htons(skb->len);
419 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
420 memcpy(ehdr->h_dest, dst, ETH_ALEN);
421 memcpy(ehdr->h_source, src, ETH_ALEN);
422 ehdr->h_proto = len;
423 }
424 return 0;
425 }
426 EXPORT_SYMBOL(ieee80211_data_to_8023);
427
428 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
429 enum nl80211_iftype iftype, u8 *bssid, bool qos)
430 {
431 struct ieee80211_hdr hdr;
432 u16 hdrlen, ethertype;
433 __le16 fc;
434 const u8 *encaps_data;
435 int encaps_len, skip_header_bytes;
436 int nh_pos, h_pos;
437 int head_need;
438
439 if (unlikely(skb->len < ETH_HLEN))
440 return -EINVAL;
441
442 nh_pos = skb_network_header(skb) - skb->data;
443 h_pos = skb_transport_header(skb) - skb->data;
444
445 /* convert Ethernet header to proper 802.11 header (based on
446 * operation mode) */
447 ethertype = (skb->data[12] << 8) | skb->data[13];
448 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
449
450 switch (iftype) {
451 case NL80211_IFTYPE_AP:
452 case NL80211_IFTYPE_AP_VLAN:
453 case NL80211_IFTYPE_P2P_GO:
454 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
455 /* DA BSSID SA */
456 memcpy(hdr.addr1, skb->data, ETH_ALEN);
457 memcpy(hdr.addr2, addr, ETH_ALEN);
458 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
459 hdrlen = 24;
460 break;
461 case NL80211_IFTYPE_STATION:
462 case NL80211_IFTYPE_P2P_CLIENT:
463 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
464 /* BSSID SA DA */
465 memcpy(hdr.addr1, bssid, ETH_ALEN);
466 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
467 memcpy(hdr.addr3, skb->data, ETH_ALEN);
468 hdrlen = 24;
469 break;
470 case NL80211_IFTYPE_ADHOC:
471 /* DA SA BSSID */
472 memcpy(hdr.addr1, skb->data, ETH_ALEN);
473 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
474 memcpy(hdr.addr3, bssid, ETH_ALEN);
475 hdrlen = 24;
476 break;
477 default:
478 return -EOPNOTSUPP;
479 }
480
481 if (qos) {
482 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
483 hdrlen += 2;
484 }
485
486 hdr.frame_control = fc;
487 hdr.duration_id = 0;
488 hdr.seq_ctrl = 0;
489
490 skip_header_bytes = ETH_HLEN;
491 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
492 encaps_data = bridge_tunnel_header;
493 encaps_len = sizeof(bridge_tunnel_header);
494 skip_header_bytes -= 2;
495 } else if (ethertype > 0x600) {
496 encaps_data = rfc1042_header;
497 encaps_len = sizeof(rfc1042_header);
498 skip_header_bytes -= 2;
499 } else {
500 encaps_data = NULL;
501 encaps_len = 0;
502 }
503
504 skb_pull(skb, skip_header_bytes);
505 nh_pos -= skip_header_bytes;
506 h_pos -= skip_header_bytes;
507
508 head_need = hdrlen + encaps_len - skb_headroom(skb);
509
510 if (head_need > 0 || skb_cloned(skb)) {
511 head_need = max(head_need, 0);
512 if (head_need)
513 skb_orphan(skb);
514
515 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) {
516 pr_err("failed to reallocate Tx buffer\n");
517 return -ENOMEM;
518 }
519 skb->truesize += head_need;
520 }
521
522 if (encaps_data) {
523 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
524 nh_pos += encaps_len;
525 h_pos += encaps_len;
526 }
527
528 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
529
530 nh_pos += hdrlen;
531 h_pos += hdrlen;
532
533 /* Update skb pointers to various headers since this modified frame
534 * is going to go through Linux networking code that may potentially
535 * need things like pointer to IP header. */
536 skb_set_mac_header(skb, 0);
537 skb_set_network_header(skb, nh_pos);
538 skb_set_transport_header(skb, h_pos);
539
540 return 0;
541 }
542 EXPORT_SYMBOL(ieee80211_data_from_8023);
543
544
545 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
546 const u8 *addr, enum nl80211_iftype iftype,
547 const unsigned int extra_headroom,
548 bool has_80211_header)
549 {
550 struct sk_buff *frame = NULL;
551 u16 ethertype;
552 u8 *payload;
553 const struct ethhdr *eth;
554 int remaining, err;
555 u8 dst[ETH_ALEN], src[ETH_ALEN];
556
557 if (has_80211_header) {
558 err = ieee80211_data_to_8023(skb, addr, iftype);
559 if (err)
560 goto out;
561
562 /* skip the wrapping header */
563 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
564 if (!eth)
565 goto out;
566 } else {
567 eth = (struct ethhdr *) skb->data;
568 }
569
570 while (skb != frame) {
571 u8 padding;
572 __be16 len = eth->h_proto;
573 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
574
575 remaining = skb->len;
576 memcpy(dst, eth->h_dest, ETH_ALEN);
577 memcpy(src, eth->h_source, ETH_ALEN);
578
579 padding = (4 - subframe_len) & 0x3;
580 /* the last MSDU has no padding */
581 if (subframe_len > remaining)
582 goto purge;
583
584 skb_pull(skb, sizeof(struct ethhdr));
585 /* reuse skb for the last subframe */
586 if (remaining <= subframe_len + padding)
587 frame = skb;
588 else {
589 unsigned int hlen = ALIGN(extra_headroom, 4);
590 /*
591 * Allocate and reserve two bytes more for payload
592 * alignment since sizeof(struct ethhdr) is 14.
593 */
594 frame = dev_alloc_skb(hlen + subframe_len + 2);
595 if (!frame)
596 goto purge;
597
598 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
599 memcpy(skb_put(frame, ntohs(len)), skb->data,
600 ntohs(len));
601
602 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
603 padding);
604 if (!eth) {
605 dev_kfree_skb(frame);
606 goto purge;
607 }
608 }
609
610 skb_reset_network_header(frame);
611 frame->dev = skb->dev;
612 frame->priority = skb->priority;
613
614 payload = frame->data;
615 ethertype = (payload[6] << 8) | payload[7];
616
617 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
618 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
619 compare_ether_addr(payload,
620 bridge_tunnel_header) == 0)) {
621 /* remove RFC1042 or Bridge-Tunnel
622 * encapsulation and replace EtherType */
623 skb_pull(frame, 6);
624 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
625 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
626 } else {
627 memcpy(skb_push(frame, sizeof(__be16)), &len,
628 sizeof(__be16));
629 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
630 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
631 }
632 __skb_queue_tail(list, frame);
633 }
634
635 return;
636
637 purge:
638 __skb_queue_purge(list);
639 out:
640 dev_kfree_skb(skb);
641 }
642 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
643
644 /* Given a data frame determine the 802.1p/1d tag to use. */
645 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
646 {
647 unsigned int dscp;
648
649 /* skb->priority values from 256->263 are magic values to
650 * directly indicate a specific 802.1d priority. This is used
651 * to allow 802.1d priority to be passed directly in from VLAN
652 * tags, etc.
653 */
654 if (skb->priority >= 256 && skb->priority <= 263)
655 return skb->priority - 256;
656
657 switch (skb->protocol) {
658 case htons(ETH_P_IP):
659 dscp = ip_hdr(skb)->tos & 0xfc;
660 break;
661 default:
662 return 0;
663 }
664
665 return dscp >> 5;
666 }
667 EXPORT_SYMBOL(cfg80211_classify8021d);
668
669 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
670 {
671 u8 *end, *pos;
672
673 pos = bss->information_elements;
674 if (pos == NULL)
675 return NULL;
676 end = pos + bss->len_information_elements;
677
678 while (pos + 1 < end) {
679 if (pos + 2 + pos[1] > end)
680 break;
681 if (pos[0] == ie)
682 return pos;
683 pos += 2 + pos[1];
684 }
685
686 return NULL;
687 }
688 EXPORT_SYMBOL(ieee80211_bss_get_ie);
689
690 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
691 {
692 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
693 struct net_device *dev = wdev->netdev;
694 int i;
695
696 if (!wdev->connect_keys)
697 return;
698
699 for (i = 0; i < 6; i++) {
700 if (!wdev->connect_keys->params[i].cipher)
701 continue;
702 if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL,
703 &wdev->connect_keys->params[i])) {
704 netdev_err(dev, "failed to set key %d\n", i);
705 continue;
706 }
707 if (wdev->connect_keys->def == i)
708 if (rdev->ops->set_default_key(wdev->wiphy, dev,
709 i, true, true)) {
710 netdev_err(dev, "failed to set defkey %d\n", i);
711 continue;
712 }
713 if (wdev->connect_keys->defmgmt == i)
714 if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
715 netdev_err(dev, "failed to set mgtdef %d\n", i);
716 }
717
718 kfree(wdev->connect_keys);
719 wdev->connect_keys = NULL;
720 }
721
722 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
723 {
724 struct cfg80211_event *ev;
725 unsigned long flags;
726 const u8 *bssid = NULL;
727
728 spin_lock_irqsave(&wdev->event_lock, flags);
729 while (!list_empty(&wdev->event_list)) {
730 ev = list_first_entry(&wdev->event_list,
731 struct cfg80211_event, list);
732 list_del(&ev->list);
733 spin_unlock_irqrestore(&wdev->event_lock, flags);
734
735 wdev_lock(wdev);
736 switch (ev->type) {
737 case EVENT_CONNECT_RESULT:
738 if (!is_zero_ether_addr(ev->cr.bssid))
739 bssid = ev->cr.bssid;
740 __cfg80211_connect_result(
741 wdev->netdev, bssid,
742 ev->cr.req_ie, ev->cr.req_ie_len,
743 ev->cr.resp_ie, ev->cr.resp_ie_len,
744 ev->cr.status,
745 ev->cr.status == WLAN_STATUS_SUCCESS,
746 NULL);
747 break;
748 case EVENT_ROAMED:
749 __cfg80211_roamed(wdev, ev->rm.channel, ev->rm.bssid,
750 ev->rm.req_ie, ev->rm.req_ie_len,
751 ev->rm.resp_ie, ev->rm.resp_ie_len);
752 break;
753 case EVENT_DISCONNECTED:
754 __cfg80211_disconnected(wdev->netdev,
755 ev->dc.ie, ev->dc.ie_len,
756 ev->dc.reason, true);
757 break;
758 case EVENT_IBSS_JOINED:
759 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
760 break;
761 }
762 wdev_unlock(wdev);
763
764 kfree(ev);
765
766 spin_lock_irqsave(&wdev->event_lock, flags);
767 }
768 spin_unlock_irqrestore(&wdev->event_lock, flags);
769 }
770
771 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
772 {
773 struct wireless_dev *wdev;
774
775 ASSERT_RTNL();
776 ASSERT_RDEV_LOCK(rdev);
777
778 mutex_lock(&rdev->devlist_mtx);
779
780 list_for_each_entry(wdev, &rdev->netdev_list, list)
781 cfg80211_process_wdev_events(wdev);
782
783 mutex_unlock(&rdev->devlist_mtx);
784 }
785
786 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
787 struct net_device *dev, enum nl80211_iftype ntype,
788 u32 *flags, struct vif_params *params)
789 {
790 int err;
791 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
792
793 ASSERT_RDEV_LOCK(rdev);
794
795 /* don't support changing VLANs, you just re-create them */
796 if (otype == NL80211_IFTYPE_AP_VLAN)
797 return -EOPNOTSUPP;
798
799 if (!rdev->ops->change_virtual_intf ||
800 !(rdev->wiphy.interface_modes & (1 << ntype)))
801 return -EOPNOTSUPP;
802
803 /* if it's part of a bridge, reject changing type to station/ibss */
804 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
805 (ntype == NL80211_IFTYPE_ADHOC ||
806 ntype == NL80211_IFTYPE_STATION ||
807 ntype == NL80211_IFTYPE_P2P_CLIENT))
808 return -EBUSY;
809
810 if (ntype != otype) {
811 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
812 ntype);
813 if (err)
814 return err;
815
816 dev->ieee80211_ptr->use_4addr = false;
817 dev->ieee80211_ptr->mesh_id_up_len = 0;
818
819 switch (otype) {
820 case NL80211_IFTYPE_ADHOC:
821 cfg80211_leave_ibss(rdev, dev, false);
822 break;
823 case NL80211_IFTYPE_STATION:
824 case NL80211_IFTYPE_P2P_CLIENT:
825 cfg80211_disconnect(rdev, dev,
826 WLAN_REASON_DEAUTH_LEAVING, true);
827 break;
828 case NL80211_IFTYPE_MESH_POINT:
829 /* mesh should be handled? */
830 break;
831 default:
832 break;
833 }
834
835 cfg80211_process_rdev_events(rdev);
836 }
837
838 err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
839 ntype, flags, params);
840
841 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
842
843 if (!err && params && params->use_4addr != -1)
844 dev->ieee80211_ptr->use_4addr = params->use_4addr;
845
846 if (!err) {
847 dev->priv_flags &= ~IFF_DONT_BRIDGE;
848 switch (ntype) {
849 case NL80211_IFTYPE_STATION:
850 if (dev->ieee80211_ptr->use_4addr)
851 break;
852 /* fall through */
853 case NL80211_IFTYPE_P2P_CLIENT:
854 case NL80211_IFTYPE_ADHOC:
855 dev->priv_flags |= IFF_DONT_BRIDGE;
856 break;
857 case NL80211_IFTYPE_P2P_GO:
858 case NL80211_IFTYPE_AP:
859 case NL80211_IFTYPE_AP_VLAN:
860 case NL80211_IFTYPE_WDS:
861 case NL80211_IFTYPE_MESH_POINT:
862 /* bridging OK */
863 break;
864 case NL80211_IFTYPE_MONITOR:
865 /* monitor can't bridge anyway */
866 break;
867 case NL80211_IFTYPE_UNSPECIFIED:
868 case NUM_NL80211_IFTYPES:
869 /* not happening */
870 break;
871 }
872 }
873
874 return err;
875 }
876
877 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
878 {
879 int modulation, streams, bitrate;
880
881 if (!(rate->flags & RATE_INFO_FLAGS_MCS))
882 return rate->legacy;
883
884 /* the formula below does only work for MCS values smaller than 32 */
885 if (rate->mcs >= 32)
886 return 0;
887
888 modulation = rate->mcs & 7;
889 streams = (rate->mcs >> 3) + 1;
890
891 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
892 13500000 : 6500000;
893
894 if (modulation < 4)
895 bitrate *= (modulation + 1);
896 else if (modulation == 4)
897 bitrate *= (modulation + 2);
898 else
899 bitrate *= (modulation + 3);
900
901 bitrate *= streams;
902
903 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
904 bitrate = (bitrate / 9) * 10;
905
906 /* do NOT round down here */
907 return (bitrate + 50000) / 100000;
908 }
909
910 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
911 u32 beacon_int)
912 {
913 struct wireless_dev *wdev;
914 int res = 0;
915
916 if (!beacon_int)
917 return -EINVAL;
918
919 mutex_lock(&rdev->devlist_mtx);
920
921 list_for_each_entry(wdev, &rdev->netdev_list, list) {
922 if (!wdev->beacon_interval)
923 continue;
924 if (wdev->beacon_interval != beacon_int) {
925 res = -EINVAL;
926 break;
927 }
928 }
929
930 mutex_unlock(&rdev->devlist_mtx);
931
932 return res;
933 }
934
935 int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
936 struct wireless_dev *wdev,
937 enum nl80211_iftype iftype)
938 {
939 struct wireless_dev *wdev_iter;
940 int num[NUM_NL80211_IFTYPES];
941 int total = 1;
942 int i, j;
943
944 ASSERT_RTNL();
945
946 /* Always allow software iftypes */
947 if (rdev->wiphy.software_iftypes & BIT(iftype))
948 return 0;
949
950 /*
951 * Drivers will gradually all set this flag, until all
952 * have it we only enforce for those that set it.
953 */
954 if (!(rdev->wiphy.flags & WIPHY_FLAG_ENFORCE_COMBINATIONS))
955 return 0;
956
957 memset(num, 0, sizeof(num));
958
959 num[iftype] = 1;
960
961 mutex_lock(&rdev->devlist_mtx);
962 list_for_each_entry(wdev_iter, &rdev->netdev_list, list) {
963 if (wdev_iter == wdev)
964 continue;
965 if (!netif_running(wdev_iter->netdev))
966 continue;
967
968 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
969 continue;
970
971 num[wdev_iter->iftype]++;
972 total++;
973 }
974 mutex_unlock(&rdev->devlist_mtx);
975
976 for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
977 const struct ieee80211_iface_combination *c;
978 struct ieee80211_iface_limit *limits;
979
980 c = &rdev->wiphy.iface_combinations[i];
981
982 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
983 GFP_KERNEL);
984 if (!limits)
985 return -ENOMEM;
986 if (total > c->max_interfaces)
987 goto cont;
988
989 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
990 if (rdev->wiphy.software_iftypes & BIT(iftype))
991 continue;
992 for (j = 0; j < c->n_limits; j++) {
993 if (!(limits[j].types & iftype))
994 continue;
995 if (limits[j].max < num[iftype])
996 goto cont;
997 limits[j].max -= num[iftype];
998 }
999 }
1000 /* yay, it fits */
1001 kfree(limits);
1002 return 0;
1003 cont:
1004 kfree(limits);
1005 }
1006
1007 return -EBUSY;
1008 }
1009
1010 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1011 const u8 *rates, unsigned int n_rates,
1012 u32 *mask)
1013 {
1014 int i, j;
1015
1016 if (!sband)
1017 return -EINVAL;
1018
1019 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1020 return -EINVAL;
1021
1022 *mask = 0;
1023
1024 for (i = 0; i < n_rates; i++) {
1025 int rate = (rates[i] & 0x7f) * 5;
1026 bool found = false;
1027
1028 for (j = 0; j < sband->n_bitrates; j++) {
1029 if (sband->bitrates[j].bitrate == rate) {
1030 found = true;
1031 *mask |= BIT(j);
1032 break;
1033 }
1034 }
1035 if (!found)
1036 return -EINVAL;
1037 }
1038
1039 /*
1040 * mask must have at least one bit set here since we
1041 * didn't accept a 0-length rates array nor allowed
1042 * entries in the array that didn't exist
1043 */
1044
1045 return 0;
1046 }
kernel-based virtual machine