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Merge commit '371a00448f95adaa612cf1a0b31a11e7093bc706' of 'git://git.kernel.org...
[mirror_ubuntu-artful-kernel.git] / net / wireless / util.c
1 /*
2 * Wireless utility functions
3 *
4 * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
5 */
6 #include <linux/export.h>
7 #include <linux/bitops.h>
8 #include <linux/etherdevice.h>
9 #include <linux/slab.h>
10 #include <net/cfg80211.h>
11 #include <net/ip.h>
12 #include <net/dsfield.h>
13 #include "core.h"
14
15 struct ieee80211_rate *
16 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
17 u32 basic_rates, int bitrate)
18 {
19 struct ieee80211_rate *result = &sband->bitrates[0];
20 int i;
21
22 for (i = 0; i < sband->n_bitrates; i++) {
23 if (!(basic_rates & BIT(i)))
24 continue;
25 if (sband->bitrates[i].bitrate > bitrate)
26 continue;
27 result = &sband->bitrates[i];
28 }
29
30 return result;
31 }
32 EXPORT_SYMBOL(ieee80211_get_response_rate);
33
34 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
35 {
36 /* see 802.11 17.3.8.3.2 and Annex J
37 * there are overlapping channel numbers in 5GHz and 2GHz bands */
38 if (chan <= 0)
39 return 0; /* not supported */
40 switch (band) {
41 case IEEE80211_BAND_2GHZ:
42 if (chan == 14)
43 return 2484;
44 else if (chan < 14)
45 return 2407 + chan * 5;
46 break;
47 case IEEE80211_BAND_5GHZ:
48 if (chan >= 182 && chan <= 196)
49 return 4000 + chan * 5;
50 else
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 ;
59 }
60 return 0; /* not supported */
61 }
62 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
63
64 int ieee80211_frequency_to_channel(int freq)
65 {
66 /* see 802.11 17.3.8.3.2 and Annex J */
67 if (freq == 2484)
68 return 14;
69 else if (freq < 2484)
70 return (freq - 2407) / 5;
71 else if (freq >= 4910 && freq <= 4980)
72 return (freq - 4000) / 5;
73 else if (freq <= 45000) /* DMG band lower limit */
74 return (freq - 5000) / 5;
75 else if (freq >= 58320 && freq <= 64800)
76 return (freq - 56160) / 2160;
77 else
78 return 0;
79 }
80 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
81
82 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
83 int freq)
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 }
103 EXPORT_SYMBOL(__ieee80211_get_channel);
104
105 static 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
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)
149 sband->bitrates[i].flags |=
150 IEEE80211_RATE_ERP_G;
151 }
152 WARN_ON(want != 0 && want != 3 && want != 6);
153 break;
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;
159 case IEEE80211_NUM_BANDS:
160 WARN_ON(1);
161 break;
162 }
163 }
164
165 void 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 }
173
174 bool 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
183 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
184 struct key_params *params, int key_idx,
185 bool pairwise, const u8 *mac_addr)
186 {
187 if (key_idx > 5)
188 return -EINVAL;
189
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
196 /*
197 * Disallow pairwise keys with non-zero index unless it's WEP
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)
202 */
203 if (pairwise && key_idx &&
204 ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
205 (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
206 (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
207 return -EINVAL;
208
209 switch (params->cipher) {
210 case WLAN_CIPHER_SUITE_WEP40:
211 if (params->key_len != WLAN_KEY_LEN_WEP40)
212 return -EINVAL;
213 break;
214 case WLAN_CIPHER_SUITE_TKIP:
215 if (params->key_len != WLAN_KEY_LEN_TKIP)
216 return -EINVAL;
217 break;
218 case WLAN_CIPHER_SUITE_CCMP:
219 if (params->key_len != WLAN_KEY_LEN_CCMP)
220 return -EINVAL;
221 break;
222 case WLAN_CIPHER_SUITE_WEP104:
223 if (params->key_len != WLAN_KEY_LEN_WEP104)
224 return -EINVAL;
225 break;
226 case WLAN_CIPHER_SUITE_AES_CMAC:
227 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
228 return -EINVAL;
229 break;
230 default:
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;
239 }
240
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
256 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
257 return -EINVAL;
258
259 return 0;
260 }
261
262 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
263 {
264 unsigned int hdrlen = 24;
265
266 if (ieee80211_is_data(fc)) {
267 if (ieee80211_has_a4(fc))
268 hdrlen = 30;
269 if (ieee80211_is_data_qos(fc)) {
270 hdrlen += IEEE80211_QOS_CTL_LEN;
271 if (ieee80211_has_order(fc))
272 hdrlen += IEEE80211_HT_CTL_LEN;
273 }
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 }
292 out:
293 return hdrlen;
294 }
295 EXPORT_SYMBOL(ieee80211_hdrlen);
296
297 unsigned 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 }
310 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
311
312 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
313 {
314 int ae = meshhdr->flags & MESH_FLAGS_AE;
315 /* 7.1.3.5a.2 */
316 switch (ae) {
317 case 0:
318 return 6;
319 case MESH_FLAGS_AE_A4:
320 return 12;
321 case MESH_FLAGS_AE_A5_A6:
322 return 18;
323 case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
324 return 24;
325 default:
326 return 6;
327 }
328 }
329
330 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
331 enum nl80211_iftype iftype)
332 {
333 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
334 u16 hdrlen, ethertype;
335 u8 *payload;
336 u8 dst[ETH_ALEN];
337 u8 src[ETH_ALEN] __aligned(2);
338
339 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
340 return -1;
341
342 hdrlen = ieee80211_hdrlen(hdr->frame_control);
343
344 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
345 * header
346 * IEEE 802.11 address fields:
347 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
348 * 0 0 DA SA BSSID n/a
349 * 0 1 DA BSSID SA n/a
350 * 1 0 BSSID SA DA n/a
351 * 1 1 RA TA DA SA
352 */
353 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
354 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
355
356 switch (hdr->frame_control &
357 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
358 case cpu_to_le16(IEEE80211_FCTL_TODS):
359 if (unlikely(iftype != NL80211_IFTYPE_AP &&
360 iftype != NL80211_IFTYPE_AP_VLAN &&
361 iftype != NL80211_IFTYPE_P2P_GO))
362 return -1;
363 break;
364 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
365 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
366 iftype != NL80211_IFTYPE_MESH_POINT &&
367 iftype != NL80211_IFTYPE_AP_VLAN &&
368 iftype != NL80211_IFTYPE_STATION))
369 return -1;
370 if (iftype == NL80211_IFTYPE_MESH_POINT) {
371 struct ieee80211s_hdr *meshdr =
372 (struct ieee80211s_hdr *) (skb->data + hdrlen);
373 /* make sure meshdr->flags is on the linear part */
374 if (!pskb_may_pull(skb, hdrlen + 1))
375 return -1;
376 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
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);
383 }
384 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
385 }
386 break;
387 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
388 if ((iftype != NL80211_IFTYPE_STATION &&
389 iftype != NL80211_IFTYPE_P2P_CLIENT &&
390 iftype != NL80211_IFTYPE_MESH_POINT) ||
391 (is_multicast_ether_addr(dst) &&
392 ether_addr_equal(src, addr)))
393 return -1;
394 if (iftype == NL80211_IFTYPE_MESH_POINT) {
395 struct ieee80211s_hdr *meshdr =
396 (struct ieee80211s_hdr *) (skb->data + hdrlen);
397 /* make sure meshdr->flags is on the linear part */
398 if (!pskb_may_pull(skb, hdrlen + 1))
399 return -1;
400 if (meshdr->flags & MESH_FLAGS_AE_A4)
401 skb_copy_bits(skb, hdrlen +
402 offsetof(struct ieee80211s_hdr, eaddr1),
403 src, ETH_ALEN);
404 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
405 }
406 break;
407 case cpu_to_le16(0):
408 if (iftype != NL80211_IFTYPE_ADHOC &&
409 iftype != NL80211_IFTYPE_STATION)
410 return -1;
411 break;
412 }
413
414 if (!pskb_may_pull(skb, hdrlen + 8))
415 return -1;
416
417 payload = skb->data + hdrlen;
418 ethertype = (payload[6] << 8) | payload[7];
419
420 if (likely((ether_addr_equal(payload, rfc1042_header) &&
421 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
422 ether_addr_equal(payload, bridge_tunnel_header))) {
423 /* remove RFC1042 or Bridge-Tunnel encapsulation and
424 * replace EtherType */
425 skb_pull(skb, hdrlen + 6);
426 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
427 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
428 } else {
429 struct ethhdr *ehdr;
430 __be16 len;
431
432 skb_pull(skb, hdrlen);
433 len = htons(skb->len);
434 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
435 memcpy(ehdr->h_dest, dst, ETH_ALEN);
436 memcpy(ehdr->h_source, src, ETH_ALEN);
437 ehdr->h_proto = len;
438 }
439 return 0;
440 }
441 EXPORT_SYMBOL(ieee80211_data_to_8023);
442
443 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
444 enum nl80211_iftype iftype, u8 *bssid, bool qos)
445 {
446 struct ieee80211_hdr hdr;
447 u16 hdrlen, ethertype;
448 __le16 fc;
449 const u8 *encaps_data;
450 int encaps_len, skip_header_bytes;
451 int nh_pos, h_pos;
452 int head_need;
453
454 if (unlikely(skb->len < ETH_HLEN))
455 return -EINVAL;
456
457 nh_pos = skb_network_header(skb) - skb->data;
458 h_pos = skb_transport_header(skb) - skb->data;
459
460 /* convert Ethernet header to proper 802.11 header (based on
461 * operation mode) */
462 ethertype = (skb->data[12] << 8) | skb->data[13];
463 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
464
465 switch (iftype) {
466 case NL80211_IFTYPE_AP:
467 case NL80211_IFTYPE_AP_VLAN:
468 case NL80211_IFTYPE_P2P_GO:
469 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
470 /* DA BSSID SA */
471 memcpy(hdr.addr1, skb->data, ETH_ALEN);
472 memcpy(hdr.addr2, addr, ETH_ALEN);
473 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
474 hdrlen = 24;
475 break;
476 case NL80211_IFTYPE_STATION:
477 case NL80211_IFTYPE_P2P_CLIENT:
478 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
479 /* BSSID SA DA */
480 memcpy(hdr.addr1, bssid, ETH_ALEN);
481 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
482 memcpy(hdr.addr3, skb->data, ETH_ALEN);
483 hdrlen = 24;
484 break;
485 case NL80211_IFTYPE_ADHOC:
486 /* DA SA BSSID */
487 memcpy(hdr.addr1, skb->data, ETH_ALEN);
488 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
489 memcpy(hdr.addr3, bssid, ETH_ALEN);
490 hdrlen = 24;
491 break;
492 default:
493 return -EOPNOTSUPP;
494 }
495
496 if (qos) {
497 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
498 hdrlen += 2;
499 }
500
501 hdr.frame_control = fc;
502 hdr.duration_id = 0;
503 hdr.seq_ctrl = 0;
504
505 skip_header_bytes = ETH_HLEN;
506 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
507 encaps_data = bridge_tunnel_header;
508 encaps_len = sizeof(bridge_tunnel_header);
509 skip_header_bytes -= 2;
510 } else if (ethertype > 0x600) {
511 encaps_data = rfc1042_header;
512 encaps_len = sizeof(rfc1042_header);
513 skip_header_bytes -= 2;
514 } else {
515 encaps_data = NULL;
516 encaps_len = 0;
517 }
518
519 skb_pull(skb, skip_header_bytes);
520 nh_pos -= skip_header_bytes;
521 h_pos -= skip_header_bytes;
522
523 head_need = hdrlen + encaps_len - skb_headroom(skb);
524
525 if (head_need > 0 || skb_cloned(skb)) {
526 head_need = max(head_need, 0);
527 if (head_need)
528 skb_orphan(skb);
529
530 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
531 return -ENOMEM;
532
533 skb->truesize += head_need;
534 }
535
536 if (encaps_data) {
537 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
538 nh_pos += encaps_len;
539 h_pos += encaps_len;
540 }
541
542 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
543
544 nh_pos += hdrlen;
545 h_pos += hdrlen;
546
547 /* Update skb pointers to various headers since this modified frame
548 * is going to go through Linux networking code that may potentially
549 * need things like pointer to IP header. */
550 skb_set_mac_header(skb, 0);
551 skb_set_network_header(skb, nh_pos);
552 skb_set_transport_header(skb, h_pos);
553
554 return 0;
555 }
556 EXPORT_SYMBOL(ieee80211_data_from_8023);
557
558
559 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
560 const u8 *addr, enum nl80211_iftype iftype,
561 const unsigned int extra_headroom,
562 bool has_80211_header)
563 {
564 struct sk_buff *frame = NULL;
565 u16 ethertype;
566 u8 *payload;
567 const struct ethhdr *eth;
568 int remaining, err;
569 u8 dst[ETH_ALEN], src[ETH_ALEN];
570
571 if (has_80211_header) {
572 err = ieee80211_data_to_8023(skb, addr, iftype);
573 if (err)
574 goto out;
575
576 /* skip the wrapping header */
577 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
578 if (!eth)
579 goto out;
580 } else {
581 eth = (struct ethhdr *) skb->data;
582 }
583
584 while (skb != frame) {
585 u8 padding;
586 __be16 len = eth->h_proto;
587 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
588
589 remaining = skb->len;
590 memcpy(dst, eth->h_dest, ETH_ALEN);
591 memcpy(src, eth->h_source, ETH_ALEN);
592
593 padding = (4 - subframe_len) & 0x3;
594 /* the last MSDU has no padding */
595 if (subframe_len > remaining)
596 goto purge;
597
598 skb_pull(skb, sizeof(struct ethhdr));
599 /* reuse skb for the last subframe */
600 if (remaining <= subframe_len + padding)
601 frame = skb;
602 else {
603 unsigned int hlen = ALIGN(extra_headroom, 4);
604 /*
605 * Allocate and reserve two bytes more for payload
606 * alignment since sizeof(struct ethhdr) is 14.
607 */
608 frame = dev_alloc_skb(hlen + subframe_len + 2);
609 if (!frame)
610 goto purge;
611
612 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
613 memcpy(skb_put(frame, ntohs(len)), skb->data,
614 ntohs(len));
615
616 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
617 padding);
618 if (!eth) {
619 dev_kfree_skb(frame);
620 goto purge;
621 }
622 }
623
624 skb_reset_network_header(frame);
625 frame->dev = skb->dev;
626 frame->priority = skb->priority;
627
628 payload = frame->data;
629 ethertype = (payload[6] << 8) | payload[7];
630
631 if (likely((ether_addr_equal(payload, rfc1042_header) &&
632 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
633 ether_addr_equal(payload, bridge_tunnel_header))) {
634 /* remove RFC1042 or Bridge-Tunnel
635 * encapsulation and replace EtherType */
636 skb_pull(frame, 6);
637 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
638 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
639 } else {
640 memcpy(skb_push(frame, sizeof(__be16)), &len,
641 sizeof(__be16));
642 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
643 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
644 }
645 __skb_queue_tail(list, frame);
646 }
647
648 return;
649
650 purge:
651 __skb_queue_purge(list);
652 out:
653 dev_kfree_skb(skb);
654 }
655 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
656
657 /* Given a data frame determine the 802.1p/1d tag to use. */
658 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
659 {
660 unsigned int dscp;
661
662 /* skb->priority values from 256->263 are magic values to
663 * directly indicate a specific 802.1d priority. This is used
664 * to allow 802.1d priority to be passed directly in from VLAN
665 * tags, etc.
666 */
667 if (skb->priority >= 256 && skb->priority <= 263)
668 return skb->priority - 256;
669
670 switch (skb->protocol) {
671 case htons(ETH_P_IP):
672 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
673 break;
674 case htons(ETH_P_IPV6):
675 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
676 break;
677 default:
678 return 0;
679 }
680
681 return dscp >> 5;
682 }
683 EXPORT_SYMBOL(cfg80211_classify8021d);
684
685 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
686 {
687 if (bss->information_elements == NULL)
688 return NULL;
689 return cfg80211_find_ie(ie, bss->information_elements,
690 bss->len_information_elements);
691 }
692 EXPORT_SYMBOL(ieee80211_bss_get_ie);
693
694 void 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;
706 if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL,
707 &wdev->connect_keys->params[i])) {
708 netdev_err(dev, "failed to set key %d\n", i);
709 continue;
710 }
711 if (wdev->connect_keys->def == i)
712 if (rdev->ops->set_default_key(wdev->wiphy, dev,
713 i, true, true)) {
714 netdev_err(dev, "failed to set defkey %d\n", i);
715 continue;
716 }
717 if (wdev->connect_keys->defmgmt == i)
718 if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
719 netdev_err(dev, "failed to set mgtdef %d\n", i);
720 }
721
722 kfree(wdev->connect_keys);
723 wdev->connect_keys = NULL;
724 }
725
726 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:
753 __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
754 ev->rm.req_ie_len, ev->rm.resp_ie,
755 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
775 void 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->wdev_list, list)
785 cfg80211_process_wdev_events(wdev);
786
787 mutex_unlock(&rdev->devlist_mtx);
788 }
789
790 int 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 /* cannot change into P2P device type */
804 if (ntype == NL80211_IFTYPE_P2P_DEVICE)
805 return -EOPNOTSUPP;
806
807 if (!rdev->ops->change_virtual_intf ||
808 !(rdev->wiphy.interface_modes & (1 << ntype)))
809 return -EOPNOTSUPP;
810
811 /* if it's part of a bridge, reject changing type to station/ibss */
812 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
813 (ntype == NL80211_IFTYPE_ADHOC ||
814 ntype == NL80211_IFTYPE_STATION ||
815 ntype == NL80211_IFTYPE_P2P_CLIENT))
816 return -EBUSY;
817
818 if (ntype != otype && netif_running(dev)) {
819 mutex_lock(&rdev->devlist_mtx);
820 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
821 ntype);
822 mutex_unlock(&rdev->devlist_mtx);
823 if (err)
824 return err;
825
826 dev->ieee80211_ptr->use_4addr = false;
827 dev->ieee80211_ptr->mesh_id_up_len = 0;
828
829 switch (otype) {
830 case NL80211_IFTYPE_AP:
831 cfg80211_stop_ap(rdev, dev);
832 break;
833 case NL80211_IFTYPE_ADHOC:
834 cfg80211_leave_ibss(rdev, dev, false);
835 break;
836 case NL80211_IFTYPE_STATION:
837 case NL80211_IFTYPE_P2P_CLIENT:
838 cfg80211_disconnect(rdev, dev,
839 WLAN_REASON_DEAUTH_LEAVING, true);
840 break;
841 case NL80211_IFTYPE_MESH_POINT:
842 /* mesh should be handled? */
843 break;
844 default:
845 break;
846 }
847
848 cfg80211_process_rdev_events(rdev);
849 }
850
851 err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
852 ntype, flags, params);
853
854 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
855
856 if (!err && params && params->use_4addr != -1)
857 dev->ieee80211_ptr->use_4addr = params->use_4addr;
858
859 if (!err) {
860 dev->priv_flags &= ~IFF_DONT_BRIDGE;
861 switch (ntype) {
862 case NL80211_IFTYPE_STATION:
863 if (dev->ieee80211_ptr->use_4addr)
864 break;
865 /* fall through */
866 case NL80211_IFTYPE_P2P_CLIENT:
867 case NL80211_IFTYPE_ADHOC:
868 dev->priv_flags |= IFF_DONT_BRIDGE;
869 break;
870 case NL80211_IFTYPE_P2P_GO:
871 case NL80211_IFTYPE_AP:
872 case NL80211_IFTYPE_AP_VLAN:
873 case NL80211_IFTYPE_WDS:
874 case NL80211_IFTYPE_MESH_POINT:
875 /* bridging OK */
876 break;
877 case NL80211_IFTYPE_MONITOR:
878 /* monitor can't bridge anyway */
879 break;
880 case NL80211_IFTYPE_UNSPECIFIED:
881 case NUM_NL80211_IFTYPES:
882 /* not happening */
883 break;
884 case NL80211_IFTYPE_P2P_DEVICE:
885 WARN_ON(1);
886 break;
887 }
888 }
889
890 if (!err && ntype != otype && netif_running(dev)) {
891 cfg80211_update_iface_num(rdev, ntype, 1);
892 cfg80211_update_iface_num(rdev, otype, -1);
893 }
894
895 return err;
896 }
897
898 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
899 {
900 static const u32 __mcs2bitrate[] = {
901 /* control PHY */
902 [0] = 275,
903 /* SC PHY */
904 [1] = 3850,
905 [2] = 7700,
906 [3] = 9625,
907 [4] = 11550,
908 [5] = 12512, /* 1251.25 mbps */
909 [6] = 15400,
910 [7] = 19250,
911 [8] = 23100,
912 [9] = 25025,
913 [10] = 30800,
914 [11] = 38500,
915 [12] = 46200,
916 /* OFDM PHY */
917 [13] = 6930,
918 [14] = 8662, /* 866.25 mbps */
919 [15] = 13860,
920 [16] = 17325,
921 [17] = 20790,
922 [18] = 27720,
923 [19] = 34650,
924 [20] = 41580,
925 [21] = 45045,
926 [22] = 51975,
927 [23] = 62370,
928 [24] = 67568, /* 6756.75 mbps */
929 /* LP-SC PHY */
930 [25] = 6260,
931 [26] = 8340,
932 [27] = 11120,
933 [28] = 12510,
934 [29] = 16680,
935 [30] = 22240,
936 [31] = 25030,
937 };
938
939 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
940 return 0;
941
942 return __mcs2bitrate[rate->mcs];
943 }
944
945 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
946 {
947 int modulation, streams, bitrate;
948
949 if (!(rate->flags & RATE_INFO_FLAGS_MCS))
950 return rate->legacy;
951 if (rate->flags & RATE_INFO_FLAGS_60G)
952 return cfg80211_calculate_bitrate_60g(rate);
953
954 /* the formula below does only work for MCS values smaller than 32 */
955 if (WARN_ON_ONCE(rate->mcs >= 32))
956 return 0;
957
958 modulation = rate->mcs & 7;
959 streams = (rate->mcs >> 3) + 1;
960
961 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
962 13500000 : 6500000;
963
964 if (modulation < 4)
965 bitrate *= (modulation + 1);
966 else if (modulation == 4)
967 bitrate *= (modulation + 2);
968 else
969 bitrate *= (modulation + 3);
970
971 bitrate *= streams;
972
973 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
974 bitrate = (bitrate / 9) * 10;
975
976 /* do NOT round down here */
977 return (bitrate + 50000) / 100000;
978 }
979 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
980
981 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
982 u32 beacon_int)
983 {
984 struct wireless_dev *wdev;
985 int res = 0;
986
987 if (!beacon_int)
988 return -EINVAL;
989
990 mutex_lock(&rdev->devlist_mtx);
991
992 list_for_each_entry(wdev, &rdev->wdev_list, list) {
993 if (!wdev->beacon_interval)
994 continue;
995 if (wdev->beacon_interval != beacon_int) {
996 res = -EINVAL;
997 break;
998 }
999 }
1000
1001 mutex_unlock(&rdev->devlist_mtx);
1002
1003 return res;
1004 }
1005
1006 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1007 struct wireless_dev *wdev,
1008 enum nl80211_iftype iftype,
1009 struct ieee80211_channel *chan,
1010 enum cfg80211_chan_mode chanmode)
1011 {
1012 struct wireless_dev *wdev_iter;
1013 u32 used_iftypes = BIT(iftype);
1014 int num[NUM_NL80211_IFTYPES];
1015 struct ieee80211_channel
1016 *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1017 struct ieee80211_channel *ch;
1018 enum cfg80211_chan_mode chmode;
1019 int num_different_channels = 0;
1020 int total = 1;
1021 int i, j;
1022
1023 ASSERT_RTNL();
1024 lockdep_assert_held(&rdev->devlist_mtx);
1025
1026 /* Always allow software iftypes */
1027 if (rdev->wiphy.software_iftypes & BIT(iftype))
1028 return 0;
1029
1030 memset(num, 0, sizeof(num));
1031 memset(used_channels, 0, sizeof(used_channels));
1032
1033 num[iftype] = 1;
1034
1035 switch (chanmode) {
1036 case CHAN_MODE_UNDEFINED:
1037 break;
1038 case CHAN_MODE_SHARED:
1039 WARN_ON(!chan);
1040 used_channels[0] = chan;
1041 num_different_channels++;
1042 break;
1043 case CHAN_MODE_EXCLUSIVE:
1044 num_different_channels++;
1045 break;
1046 }
1047
1048 list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1049 if (wdev_iter == wdev)
1050 continue;
1051 if (wdev_iter->netdev) {
1052 if (!netif_running(wdev_iter->netdev))
1053 continue;
1054 } else if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1055 if (!wdev_iter->p2p_started)
1056 continue;
1057 } else {
1058 WARN_ON(1);
1059 }
1060
1061 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1062 continue;
1063
1064 /*
1065 * We may be holding the "wdev" mutex, but now need to lock
1066 * wdev_iter. This is OK because once we get here wdev_iter
1067 * is not wdev (tested above), but we need to use the nested
1068 * locking for lockdep.
1069 */
1070 mutex_lock_nested(&wdev_iter->mtx, 1);
1071 __acquire(wdev_iter->mtx);
1072 cfg80211_get_chan_state(wdev_iter, &ch, &chmode);
1073 wdev_unlock(wdev_iter);
1074
1075 switch (chmode) {
1076 case CHAN_MODE_UNDEFINED:
1077 break;
1078 case CHAN_MODE_SHARED:
1079 for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1080 if (!used_channels[i] || used_channels[i] == ch)
1081 break;
1082
1083 if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1084 return -EBUSY;
1085
1086 if (used_channels[i] == NULL) {
1087 used_channels[i] = ch;
1088 num_different_channels++;
1089 }
1090 break;
1091 case CHAN_MODE_EXCLUSIVE:
1092 num_different_channels++;
1093 break;
1094 }
1095
1096 num[wdev_iter->iftype]++;
1097 total++;
1098 used_iftypes |= BIT(wdev_iter->iftype);
1099 }
1100
1101 if (total == 1)
1102 return 0;
1103
1104 for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
1105 const struct ieee80211_iface_combination *c;
1106 struct ieee80211_iface_limit *limits;
1107 u32 all_iftypes = 0;
1108
1109 c = &rdev->wiphy.iface_combinations[i];
1110
1111 if (total > c->max_interfaces)
1112 continue;
1113 if (num_different_channels > c->num_different_channels)
1114 continue;
1115
1116 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1117 GFP_KERNEL);
1118 if (!limits)
1119 return -ENOMEM;
1120
1121 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1122 if (rdev->wiphy.software_iftypes & BIT(iftype))
1123 continue;
1124 for (j = 0; j < c->n_limits; j++) {
1125 all_iftypes |= limits[j].types;
1126 if (!(limits[j].types & BIT(iftype)))
1127 continue;
1128 if (limits[j].max < num[iftype])
1129 goto cont;
1130 limits[j].max -= num[iftype];
1131 }
1132 }
1133
1134 /*
1135 * Finally check that all iftypes that we're currently
1136 * using are actually part of this combination. If they
1137 * aren't then we can't use this combination and have
1138 * to continue to the next.
1139 */
1140 if ((all_iftypes & used_iftypes) != used_iftypes)
1141 goto cont;
1142
1143 /*
1144 * This combination covered all interface types and
1145 * supported the requested numbers, so we're good.
1146 */
1147 kfree(limits);
1148 return 0;
1149 cont:
1150 kfree(limits);
1151 }
1152
1153 return -EBUSY;
1154 }
1155
1156 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1157 const u8 *rates, unsigned int n_rates,
1158 u32 *mask)
1159 {
1160 int i, j;
1161
1162 if (!sband)
1163 return -EINVAL;
1164
1165 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1166 return -EINVAL;
1167
1168 *mask = 0;
1169
1170 for (i = 0; i < n_rates; i++) {
1171 int rate = (rates[i] & 0x7f) * 5;
1172 bool found = false;
1173
1174 for (j = 0; j < sband->n_bitrates; j++) {
1175 if (sband->bitrates[j].bitrate == rate) {
1176 found = true;
1177 *mask |= BIT(j);
1178 break;
1179 }
1180 }
1181 if (!found)
1182 return -EINVAL;
1183 }
1184
1185 /*
1186 * mask must have at least one bit set here since we
1187 * didn't accept a 0-length rates array nor allowed
1188 * entries in the array that didn't exist
1189 */
1190
1191 return 0;
1192 }
1193
1194 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1195 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1196 const unsigned char rfc1042_header[] __aligned(2) =
1197 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1198 EXPORT_SYMBOL(rfc1042_header);
1199
1200 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1201 const unsigned char bridge_tunnel_header[] __aligned(2) =
1202 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1203 EXPORT_SYMBOL(bridge_tunnel_header);
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