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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / net / wireless / util.c
blob935dea9485da01f7a0fb82cacc6e187058ff1ce0
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 <linux/if_vlan.h>
14 #include "core.h"
15 #include "rdev-ops.h"
16
17
18 struct ieee80211_rate *
19 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
20 u32 basic_rates, int bitrate)
21 {
22 struct ieee80211_rate *result = &sband->bitrates[0];
23 int i;
24
25 for (i = 0; i < sband->n_bitrates; i++) {
26 if (!(basic_rates & BIT(i)))
27 continue;
28 if (sband->bitrates[i].bitrate > bitrate)
29 continue;
30 result = &sband->bitrates[i];
31 }
32
33 return result;
34 }
35 EXPORT_SYMBOL(ieee80211_get_response_rate);
36
37 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
38 enum nl80211_bss_scan_width scan_width)
39 {
40 struct ieee80211_rate *bitrates;
41 u32 mandatory_rates = 0;
42 enum ieee80211_rate_flags mandatory_flag;
43 int i;
44
45 if (WARN_ON(!sband))
46 return 1;
47
48 if (sband->band == IEEE80211_BAND_2GHZ) {
49 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
50 scan_width == NL80211_BSS_CHAN_WIDTH_10)
51 mandatory_flag = IEEE80211_RATE_MANDATORY_G;
52 else
53 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
54 } else {
55 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
56 }
57
58 bitrates = sband->bitrates;
59 for (i = 0; i < sband->n_bitrates; i++)
60 if (bitrates[i].flags & mandatory_flag)
61 mandatory_rates |= BIT(i);
62 return mandatory_rates;
63 }
64 EXPORT_SYMBOL(ieee80211_mandatory_rates);
65
66 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
67 {
68 /* see 802.11 17.3.8.3.2 and Annex J
69 * there are overlapping channel numbers in 5GHz and 2GHz bands */
70 if (chan <= 0)
71 return 0; /* not supported */
72 switch (band) {
73 case IEEE80211_BAND_2GHZ:
74 if (chan == 14)
75 return 2484;
76 else if (chan < 14)
77 return 2407 + chan * 5;
78 break;
79 case IEEE80211_BAND_5GHZ:
80 if (chan >= 182 && chan <= 196)
81 return 4000 + chan * 5;
82 else
83 return 5000 + chan * 5;
84 break;
85 case IEEE80211_BAND_60GHZ:
86 if (chan < 5)
87 return 56160 + chan * 2160;
88 break;
89 default:
90 ;
91 }
92 return 0; /* not supported */
93 }
94 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
95
96 int ieee80211_frequency_to_channel(int freq)
97 {
98 /* see 802.11 17.3.8.3.2 and Annex J */
99 if (freq == 2484)
100 return 14;
101 else if (freq < 2484)
102 return (freq - 2407) / 5;
103 else if (freq >= 4910 && freq <= 4980)
104 return (freq - 4000) / 5;
105 else if (freq <= 45000) /* DMG band lower limit */
106 return (freq - 5000) / 5;
107 else if (freq >= 58320 && freq <= 64800)
108 return (freq - 56160) / 2160;
109 else
110 return 0;
111 }
112 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
113
114 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
115 int freq)
116 {
117 enum ieee80211_band band;
118 struct ieee80211_supported_band *sband;
119 int i;
120
121 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
122 sband = wiphy->bands[band];
123
124 if (!sband)
125 continue;
126
127 for (i = 0; i < sband->n_channels; i++) {
128 if (sband->channels[i].center_freq == freq)
129 return &sband->channels[i];
130 }
131 }
132
133 return NULL;
134 }
135 EXPORT_SYMBOL(__ieee80211_get_channel);
136
137 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
138 enum ieee80211_band band)
139 {
140 int i, want;
141
142 switch (band) {
143 case IEEE80211_BAND_5GHZ:
144 want = 3;
145 for (i = 0; i < sband->n_bitrates; i++) {
146 if (sband->bitrates[i].bitrate == 60 ||
147 sband->bitrates[i].bitrate == 120 ||
148 sband->bitrates[i].bitrate == 240) {
149 sband->bitrates[i].flags |=
150 IEEE80211_RATE_MANDATORY_A;
151 want--;
152 }
153 }
154 WARN_ON(want);
155 break;
156 case IEEE80211_BAND_2GHZ:
157 want = 7;
158 for (i = 0; i < sband->n_bitrates; i++) {
159 if (sband->bitrates[i].bitrate == 10) {
160 sband->bitrates[i].flags |=
161 IEEE80211_RATE_MANDATORY_B |
162 IEEE80211_RATE_MANDATORY_G;
163 want--;
164 }
165
166 if (sband->bitrates[i].bitrate == 20 ||
167 sband->bitrates[i].bitrate == 55 ||
168 sband->bitrates[i].bitrate == 110 ||
169 sband->bitrates[i].bitrate == 60 ||
170 sband->bitrates[i].bitrate == 120 ||
171 sband->bitrates[i].bitrate == 240) {
172 sband->bitrates[i].flags |=
173 IEEE80211_RATE_MANDATORY_G;
174 want--;
175 }
176
177 if (sband->bitrates[i].bitrate != 10 &&
178 sband->bitrates[i].bitrate != 20 &&
179 sband->bitrates[i].bitrate != 55 &&
180 sband->bitrates[i].bitrate != 110)
181 sband->bitrates[i].flags |=
182 IEEE80211_RATE_ERP_G;
183 }
184 WARN_ON(want != 0 && want != 3 && want != 6);
185 break;
186 case IEEE80211_BAND_60GHZ:
187 /* check for mandatory HT MCS 1..4 */
188 WARN_ON(!sband->ht_cap.ht_supported);
189 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
190 break;
191 case IEEE80211_NUM_BANDS:
192 WARN_ON(1);
193 break;
194 }
195 }
196
197 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
198 {
199 enum ieee80211_band band;
200
201 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
202 if (wiphy->bands[band])
203 set_mandatory_flags_band(wiphy->bands[band], band);
204 }
205
206 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
207 {
208 int i;
209 for (i = 0; i < wiphy->n_cipher_suites; i++)
210 if (cipher == wiphy->cipher_suites[i])
211 return true;
212 return false;
213 }
214
215 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
216 struct key_params *params, int key_idx,
217 bool pairwise, const u8 *mac_addr)
218 {
219 if (key_idx > 5)
220 return -EINVAL;
221
222 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
223 return -EINVAL;
224
225 if (pairwise && !mac_addr)
226 return -EINVAL;
227
228 /*
229 * Disallow pairwise keys with non-zero index unless it's WEP
230 * or a vendor specific cipher (because current deployments use
231 * pairwise WEP keys with non-zero indices and for vendor specific
232 * ciphers this should be validated in the driver or hardware level
233 * - but 802.11i clearly specifies to use zero)
234 */
235 if (pairwise && key_idx &&
236 ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
237 (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
238 (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
239 return -EINVAL;
240
241 switch (params->cipher) {
242 case WLAN_CIPHER_SUITE_WEP40:
243 if (params->key_len != WLAN_KEY_LEN_WEP40)
244 return -EINVAL;
245 break;
246 case WLAN_CIPHER_SUITE_TKIP:
247 if (params->key_len != WLAN_KEY_LEN_TKIP)
248 return -EINVAL;
249 break;
250 case WLAN_CIPHER_SUITE_CCMP:
251 if (params->key_len != WLAN_KEY_LEN_CCMP)
252 return -EINVAL;
253 break;
254 case WLAN_CIPHER_SUITE_WEP104:
255 if (params->key_len != WLAN_KEY_LEN_WEP104)
256 return -EINVAL;
257 break;
258 case WLAN_CIPHER_SUITE_AES_CMAC:
259 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
260 return -EINVAL;
261 break;
262 default:
263 /*
264 * We don't know anything about this algorithm,
265 * allow using it -- but the driver must check
266 * all parameters! We still check below whether
267 * or not the driver supports this algorithm,
268 * of course.
269 */
270 break;
271 }
272
273 if (params->seq) {
274 switch (params->cipher) {
275 case WLAN_CIPHER_SUITE_WEP40:
276 case WLAN_CIPHER_SUITE_WEP104:
277 /* These ciphers do not use key sequence */
278 return -EINVAL;
279 case WLAN_CIPHER_SUITE_TKIP:
280 case WLAN_CIPHER_SUITE_CCMP:
281 case WLAN_CIPHER_SUITE_AES_CMAC:
282 if (params->seq_len != 6)
283 return -EINVAL;
284 break;
285 }
286 }
287
288 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
289 return -EINVAL;
290
291 return 0;
292 }
293
294 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
295 {
296 unsigned int hdrlen = 24;
297
298 if (ieee80211_is_data(fc)) {
299 if (ieee80211_has_a4(fc))
300 hdrlen = 30;
301 if (ieee80211_is_data_qos(fc)) {
302 hdrlen += IEEE80211_QOS_CTL_LEN;
303 if (ieee80211_has_order(fc))
304 hdrlen += IEEE80211_HT_CTL_LEN;
305 }
306 goto out;
307 }
308
309 if (ieee80211_is_ctl(fc)) {
310 /*
311 * ACK and CTS are 10 bytes, all others 16. To see how
312 * to get this condition consider
313 * subtype mask: 0b0000000011110000 (0x00F0)
314 * ACK subtype: 0b0000000011010000 (0x00D0)
315 * CTS subtype: 0b0000000011000000 (0x00C0)
316 * bits that matter: ^^^ (0x00E0)
317 * value of those: 0b0000000011000000 (0x00C0)
318 */
319 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
320 hdrlen = 10;
321 else
322 hdrlen = 16;
323 }
324 out:
325 return hdrlen;
326 }
327 EXPORT_SYMBOL(ieee80211_hdrlen);
328
329 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
330 {
331 const struct ieee80211_hdr *hdr =
332 (const struct ieee80211_hdr *)skb->data;
333 unsigned int hdrlen;
334
335 if (unlikely(skb->len < 10))
336 return 0;
337 hdrlen = ieee80211_hdrlen(hdr->frame_control);
338 if (unlikely(hdrlen > skb->len))
339 return 0;
340 return hdrlen;
341 }
342 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
343
344 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
345 {
346 int ae = meshhdr->flags & MESH_FLAGS_AE;
347 /* 802.11-2012, 8.2.4.7.3 */
348 switch (ae) {
349 default:
350 case 0:
351 return 6;
352 case MESH_FLAGS_AE_A4:
353 return 12;
354 case MESH_FLAGS_AE_A5_A6:
355 return 18;
356 }
357 }
358 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
359
360 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
361 enum nl80211_iftype iftype)
362 {
363 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
364 u16 hdrlen, ethertype;
365 u8 *payload;
366 u8 dst[ETH_ALEN];
367 u8 src[ETH_ALEN] __aligned(2);
368
369 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
370 return -1;
371
372 hdrlen = ieee80211_hdrlen(hdr->frame_control);
373
374 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
375 * header
376 * IEEE 802.11 address fields:
377 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
378 * 0 0 DA SA BSSID n/a
379 * 0 1 DA BSSID SA n/a
380 * 1 0 BSSID SA DA n/a
381 * 1 1 RA TA DA SA
382 */
383 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
384 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
385
386 switch (hdr->frame_control &
387 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
388 case cpu_to_le16(IEEE80211_FCTL_TODS):
389 if (unlikely(iftype != NL80211_IFTYPE_AP &&
390 iftype != NL80211_IFTYPE_AP_VLAN &&
391 iftype != NL80211_IFTYPE_P2P_GO))
392 return -1;
393 break;
394 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
395 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
396 iftype != NL80211_IFTYPE_MESH_POINT &&
397 iftype != NL80211_IFTYPE_AP_VLAN &&
398 iftype != NL80211_IFTYPE_STATION))
399 return -1;
400 if (iftype == NL80211_IFTYPE_MESH_POINT) {
401 struct ieee80211s_hdr *meshdr =
402 (struct ieee80211s_hdr *) (skb->data + hdrlen);
403 /* make sure meshdr->flags is on the linear part */
404 if (!pskb_may_pull(skb, hdrlen + 1))
405 return -1;
406 if (meshdr->flags & MESH_FLAGS_AE_A4)
407 return -1;
408 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
409 skb_copy_bits(skb, hdrlen +
410 offsetof(struct ieee80211s_hdr, eaddr1),
411 dst, ETH_ALEN);
412 skb_copy_bits(skb, hdrlen +
413 offsetof(struct ieee80211s_hdr, eaddr2),
414 src, ETH_ALEN);
415 }
416 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
417 }
418 break;
419 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
420 if ((iftype != NL80211_IFTYPE_STATION &&
421 iftype != NL80211_IFTYPE_P2P_CLIENT &&
422 iftype != NL80211_IFTYPE_MESH_POINT) ||
423 (is_multicast_ether_addr(dst) &&
424 ether_addr_equal(src, addr)))
425 return -1;
426 if (iftype == NL80211_IFTYPE_MESH_POINT) {
427 struct ieee80211s_hdr *meshdr =
428 (struct ieee80211s_hdr *) (skb->data + hdrlen);
429 /* make sure meshdr->flags is on the linear part */
430 if (!pskb_may_pull(skb, hdrlen + 1))
431 return -1;
432 if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
433 return -1;
434 if (meshdr->flags & MESH_FLAGS_AE_A4)
435 skb_copy_bits(skb, hdrlen +
436 offsetof(struct ieee80211s_hdr, eaddr1),
437 src, ETH_ALEN);
438 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
439 }
440 break;
441 case cpu_to_le16(0):
442 if (iftype != NL80211_IFTYPE_ADHOC &&
443 iftype != NL80211_IFTYPE_STATION)
444 return -1;
445 break;
446 }
447
448 if (!pskb_may_pull(skb, hdrlen + 8))
449 return -1;
450
451 payload = skb->data + hdrlen;
452 ethertype = (payload[6] << 8) | payload[7];
453
454 if (likely((ether_addr_equal(payload, rfc1042_header) &&
455 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
456 ether_addr_equal(payload, bridge_tunnel_header))) {
457 /* remove RFC1042 or Bridge-Tunnel encapsulation and
458 * replace EtherType */
459 skb_pull(skb, hdrlen + 6);
460 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
461 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
462 } else {
463 struct ethhdr *ehdr;
464 __be16 len;
465
466 skb_pull(skb, hdrlen);
467 len = htons(skb->len);
468 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
469 memcpy(ehdr->h_dest, dst, ETH_ALEN);
470 memcpy(ehdr->h_source, src, ETH_ALEN);
471 ehdr->h_proto = len;
472 }
473 return 0;
474 }
475 EXPORT_SYMBOL(ieee80211_data_to_8023);
476
477 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
478 enum nl80211_iftype iftype, u8 *bssid, bool qos)
479 {
480 struct ieee80211_hdr hdr;
481 u16 hdrlen, ethertype;
482 __le16 fc;
483 const u8 *encaps_data;
484 int encaps_len, skip_header_bytes;
485 int nh_pos, h_pos;
486 int head_need;
487
488 if (unlikely(skb->len < ETH_HLEN))
489 return -EINVAL;
490
491 nh_pos = skb_network_header(skb) - skb->data;
492 h_pos = skb_transport_header(skb) - skb->data;
493
494 /* convert Ethernet header to proper 802.11 header (based on
495 * operation mode) */
496 ethertype = (skb->data[12] << 8) | skb->data[13];
497 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
498
499 switch (iftype) {
500 case NL80211_IFTYPE_AP:
501 case NL80211_IFTYPE_AP_VLAN:
502 case NL80211_IFTYPE_P2P_GO:
503 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
504 /* DA BSSID SA */
505 memcpy(hdr.addr1, skb->data, ETH_ALEN);
506 memcpy(hdr.addr2, addr, ETH_ALEN);
507 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
508 hdrlen = 24;
509 break;
510 case NL80211_IFTYPE_STATION:
511 case NL80211_IFTYPE_P2P_CLIENT:
512 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
513 /* BSSID SA DA */
514 memcpy(hdr.addr1, bssid, ETH_ALEN);
515 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
516 memcpy(hdr.addr3, skb->data, ETH_ALEN);
517 hdrlen = 24;
518 break;
519 case NL80211_IFTYPE_ADHOC:
520 /* DA SA BSSID */
521 memcpy(hdr.addr1, skb->data, ETH_ALEN);
522 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
523 memcpy(hdr.addr3, bssid, ETH_ALEN);
524 hdrlen = 24;
525 break;
526 default:
527 return -EOPNOTSUPP;
528 }
529
530 if (qos) {
531 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
532 hdrlen += 2;
533 }
534
535 hdr.frame_control = fc;
536 hdr.duration_id = 0;
537 hdr.seq_ctrl = 0;
538
539 skip_header_bytes = ETH_HLEN;
540 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
541 encaps_data = bridge_tunnel_header;
542 encaps_len = sizeof(bridge_tunnel_header);
543 skip_header_bytes -= 2;
544 } else if (ethertype >= ETH_P_802_3_MIN) {
545 encaps_data = rfc1042_header;
546 encaps_len = sizeof(rfc1042_header);
547 skip_header_bytes -= 2;
548 } else {
549 encaps_data = NULL;
550 encaps_len = 0;
551 }
552
553 skb_pull(skb, skip_header_bytes);
554 nh_pos -= skip_header_bytes;
555 h_pos -= skip_header_bytes;
556
557 head_need = hdrlen + encaps_len - skb_headroom(skb);
558
559 if (head_need > 0 || skb_cloned(skb)) {
560 head_need = max(head_need, 0);
561 if (head_need)
562 skb_orphan(skb);
563
564 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
565 return -ENOMEM;
566
567 skb->truesize += head_need;
568 }
569
570 if (encaps_data) {
571 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
572 nh_pos += encaps_len;
573 h_pos += encaps_len;
574 }
575
576 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
577
578 nh_pos += hdrlen;
579 h_pos += hdrlen;
580
581 /* Update skb pointers to various headers since this modified frame
582 * is going to go through Linux networking code that may potentially
583 * need things like pointer to IP header. */
584 skb_set_mac_header(skb, 0);
585 skb_set_network_header(skb, nh_pos);
586 skb_set_transport_header(skb, h_pos);
587
588 return 0;
589 }
590 EXPORT_SYMBOL(ieee80211_data_from_8023);
591
592
593 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
594 const u8 *addr, enum nl80211_iftype iftype,
595 const unsigned int extra_headroom,
596 bool has_80211_header)
597 {
598 struct sk_buff *frame = NULL;
599 u16 ethertype;
600 u8 *payload;
601 const struct ethhdr *eth;
602 int remaining, err;
603 u8 dst[ETH_ALEN], src[ETH_ALEN];
604
605 if (has_80211_header) {
606 err = ieee80211_data_to_8023(skb, addr, iftype);
607 if (err)
608 goto out;
609
610 /* skip the wrapping header */
611 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
612 if (!eth)
613 goto out;
614 } else {
615 eth = (struct ethhdr *) skb->data;
616 }
617
618 while (skb != frame) {
619 u8 padding;
620 __be16 len = eth->h_proto;
621 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
622
623 remaining = skb->len;
624 memcpy(dst, eth->h_dest, ETH_ALEN);
625 memcpy(src, eth->h_source, ETH_ALEN);
626
627 padding = (4 - subframe_len) & 0x3;
628 /* the last MSDU has no padding */
629 if (subframe_len > remaining)
630 goto purge;
631
632 skb_pull(skb, sizeof(struct ethhdr));
633 /* reuse skb for the last subframe */
634 if (remaining <= subframe_len + padding)
635 frame = skb;
636 else {
637 unsigned int hlen = ALIGN(extra_headroom, 4);
638 /*
639 * Allocate and reserve two bytes more for payload
640 * alignment since sizeof(struct ethhdr) is 14.
641 */
642 frame = dev_alloc_skb(hlen + subframe_len + 2);
643 if (!frame)
644 goto purge;
645
646 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
647 memcpy(skb_put(frame, ntohs(len)), skb->data,
648 ntohs(len));
649
650 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
651 padding);
652 if (!eth) {
653 dev_kfree_skb(frame);
654 goto purge;
655 }
656 }
657
658 skb_reset_network_header(frame);
659 frame->dev = skb->dev;
660 frame->priority = skb->priority;
661
662 payload = frame->data;
663 ethertype = (payload[6] << 8) | payload[7];
664
665 if (likely((ether_addr_equal(payload, rfc1042_header) &&
666 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
667 ether_addr_equal(payload, bridge_tunnel_header))) {
668 /* remove RFC1042 or Bridge-Tunnel
669 * encapsulation and replace EtherType */
670 skb_pull(frame, 6);
671 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
672 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
673 } else {
674 memcpy(skb_push(frame, sizeof(__be16)), &len,
675 sizeof(__be16));
676 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
677 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
678 }
679 __skb_queue_tail(list, frame);
680 }
681
682 return;
683
684 purge:
685 __skb_queue_purge(list);
686 out:
687 dev_kfree_skb(skb);
688 }
689 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
690
691 /* Given a data frame determine the 802.1p/1d tag to use. */
692 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
693 {
694 unsigned int dscp;
695 unsigned char vlan_priority;
696
697 /* skb->priority values from 256->263 are magic values to
698 * directly indicate a specific 802.1d priority. This is used
699 * to allow 802.1d priority to be passed directly in from VLAN
700 * tags, etc.
701 */
702 if (skb->priority >= 256 && skb->priority <= 263)
703 return skb->priority - 256;
704
705 if (vlan_tx_tag_present(skb)) {
706 vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK)
707 >> VLAN_PRIO_SHIFT;
708 if (vlan_priority > 0)
709 return vlan_priority;
710 }
711
712 switch (skb->protocol) {
713 case htons(ETH_P_IP):
714 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
715 break;
716 case htons(ETH_P_IPV6):
717 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
718 break;
719 default:
720 return 0;
721 }
722
723 return dscp >> 5;
724 }
725 EXPORT_SYMBOL(cfg80211_classify8021d);
726
727 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
728 {
729 const struct cfg80211_bss_ies *ies;
730
731 ies = rcu_dereference(bss->ies);
732 if (!ies)
733 return NULL;
734
735 return cfg80211_find_ie(ie, ies->data, ies->len);
736 }
737 EXPORT_SYMBOL(ieee80211_bss_get_ie);
738
739 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
740 {
741 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
742 struct net_device *dev = wdev->netdev;
743 int i;
744
745 if (!wdev->connect_keys)
746 return;
747
748 for (i = 0; i < 6; i++) {
749 if (!wdev->connect_keys->params[i].cipher)
750 continue;
751 if (rdev_add_key(rdev, dev, i, false, NULL,
752 &wdev->connect_keys->params[i])) {
753 netdev_err(dev, "failed to set key %d\n", i);
754 continue;
755 }
756 if (wdev->connect_keys->def == i)
757 if (rdev_set_default_key(rdev, dev, i, true, true)) {
758 netdev_err(dev, "failed to set defkey %d\n", i);
759 continue;
760 }
761 if (wdev->connect_keys->defmgmt == i)
762 if (rdev_set_default_mgmt_key(rdev, dev, i))
763 netdev_err(dev, "failed to set mgtdef %d\n", i);
764 }
765
766 kfree(wdev->connect_keys);
767 wdev->connect_keys = NULL;
768 }
769
770 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
771 {
772 struct cfg80211_event *ev;
773 unsigned long flags;
774 const u8 *bssid = NULL;
775
776 spin_lock_irqsave(&wdev->event_lock, flags);
777 while (!list_empty(&wdev->event_list)) {
778 ev = list_first_entry(&wdev->event_list,
779 struct cfg80211_event, list);
780 list_del(&ev->list);
781 spin_unlock_irqrestore(&wdev->event_lock, flags);
782
783 wdev_lock(wdev);
784 switch (ev->type) {
785 case EVENT_CONNECT_RESULT:
786 if (!is_zero_ether_addr(ev->cr.bssid))
787 bssid = ev->cr.bssid;
788 __cfg80211_connect_result(
789 wdev->netdev, bssid,
790 ev->cr.req_ie, ev->cr.req_ie_len,
791 ev->cr.resp_ie, ev->cr.resp_ie_len,
792 ev->cr.status,
793 ev->cr.status == WLAN_STATUS_SUCCESS,
794 NULL);
795 break;
796 case EVENT_ROAMED:
797 __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
798 ev->rm.req_ie_len, ev->rm.resp_ie,
799 ev->rm.resp_ie_len);
800 break;
801 case EVENT_DISCONNECTED:
802 __cfg80211_disconnected(wdev->netdev,
803 ev->dc.ie, ev->dc.ie_len,
804 ev->dc.reason, true);
805 break;
806 case EVENT_IBSS_JOINED:
807 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
808 break;
809 }
810 wdev_unlock(wdev);
811
812 kfree(ev);
813
814 spin_lock_irqsave(&wdev->event_lock, flags);
815 }
816 spin_unlock_irqrestore(&wdev->event_lock, flags);
817 }
818
819 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
820 {
821 struct wireless_dev *wdev;
822
823 ASSERT_RTNL();
824 ASSERT_RDEV_LOCK(rdev);
825
826 list_for_each_entry(wdev, &rdev->wdev_list, list)
827 cfg80211_process_wdev_events(wdev);
828 }
829
830 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
831 struct net_device *dev, enum nl80211_iftype ntype,
832 u32 *flags, struct vif_params *params)
833 {
834 int err;
835 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
836
837 ASSERT_RDEV_LOCK(rdev);
838
839 /* don't support changing VLANs, you just re-create them */
840 if (otype == NL80211_IFTYPE_AP_VLAN)
841 return -EOPNOTSUPP;
842
843 /* cannot change into P2P device type */
844 if (ntype == NL80211_IFTYPE_P2P_DEVICE)
845 return -EOPNOTSUPP;
846
847 if (!rdev->ops->change_virtual_intf ||
848 !(rdev->wiphy.interface_modes & (1 << ntype)))
849 return -EOPNOTSUPP;
850
851 /* if it's part of a bridge, reject changing type to station/ibss */
852 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
853 (ntype == NL80211_IFTYPE_ADHOC ||
854 ntype == NL80211_IFTYPE_STATION ||
855 ntype == NL80211_IFTYPE_P2P_CLIENT))
856 return -EBUSY;
857
858 if (ntype != otype && netif_running(dev)) {
859 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
860 ntype);
861 if (err)
862 return err;
863
864 dev->ieee80211_ptr->use_4addr = false;
865 dev->ieee80211_ptr->mesh_id_up_len = 0;
866
867 switch (otype) {
868 case NL80211_IFTYPE_AP:
869 cfg80211_stop_ap(rdev, dev);
870 break;
871 case NL80211_IFTYPE_ADHOC:
872 cfg80211_leave_ibss(rdev, dev, false);
873 break;
874 case NL80211_IFTYPE_STATION:
875 case NL80211_IFTYPE_P2P_CLIENT:
876 wdev_lock(dev->ieee80211_ptr);
877 cfg80211_disconnect(rdev, dev,
878 WLAN_REASON_DEAUTH_LEAVING, true);
879 wdev_unlock(dev->ieee80211_ptr);
880 break;
881 case NL80211_IFTYPE_MESH_POINT:
882 /* mesh should be handled? */
883 break;
884 default:
885 break;
886 }
887
888 cfg80211_process_rdev_events(rdev);
889 }
890
891 err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
892
893 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
894
895 if (!err && params && params->use_4addr != -1)
896 dev->ieee80211_ptr->use_4addr = params->use_4addr;
897
898 if (!err) {
899 dev->priv_flags &= ~IFF_DONT_BRIDGE;
900 switch (ntype) {
901 case NL80211_IFTYPE_STATION:
902 if (dev->ieee80211_ptr->use_4addr)
903 break;
904 /* fall through */
905 case NL80211_IFTYPE_P2P_CLIENT:
906 case NL80211_IFTYPE_ADHOC:
907 dev->priv_flags |= IFF_DONT_BRIDGE;
908 break;
909 case NL80211_IFTYPE_P2P_GO:
910 case NL80211_IFTYPE_AP:
911 case NL80211_IFTYPE_AP_VLAN:
912 case NL80211_IFTYPE_WDS:
913 case NL80211_IFTYPE_MESH_POINT:
914 /* bridging OK */
915 break;
916 case NL80211_IFTYPE_MONITOR:
917 /* monitor can't bridge anyway */
918 break;
919 case NL80211_IFTYPE_UNSPECIFIED:
920 case NUM_NL80211_IFTYPES:
921 /* not happening */
922 break;
923 case NL80211_IFTYPE_P2P_DEVICE:
924 WARN_ON(1);
925 break;
926 }
927 }
928
929 if (!err && ntype != otype && netif_running(dev)) {
930 cfg80211_update_iface_num(rdev, ntype, 1);
931 cfg80211_update_iface_num(rdev, otype, -1);
932 }
933
934 return err;
935 }
936
937 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
938 {
939 static const u32 __mcs2bitrate[] = {
940 /* control PHY */
941 [0] = 275,
942 /* SC PHY */
943 [1] = 3850,
944 [2] = 7700,
945 [3] = 9625,
946 [4] = 11550,
947 [5] = 12512, /* 1251.25 mbps */
948 [6] = 15400,
949 [7] = 19250,
950 [8] = 23100,
951 [9] = 25025,
952 [10] = 30800,
953 [11] = 38500,
954 [12] = 46200,
955 /* OFDM PHY */
956 [13] = 6930,
957 [14] = 8662, /* 866.25 mbps */
958 [15] = 13860,
959 [16] = 17325,
960 [17] = 20790,
961 [18] = 27720,
962 [19] = 34650,
963 [20] = 41580,
964 [21] = 45045,
965 [22] = 51975,
966 [23] = 62370,
967 [24] = 67568, /* 6756.75 mbps */
968 /* LP-SC PHY */
969 [25] = 6260,
970 [26] = 8340,
971 [27] = 11120,
972 [28] = 12510,
973 [29] = 16680,
974 [30] = 22240,
975 [31] = 25030,
976 };
977
978 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
979 return 0;
980
981 return __mcs2bitrate[rate->mcs];
982 }
983
984 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
985 {
986 static const u32 base[4][10] = {
987 { 6500000,
988 13000000,
989 19500000,
990 26000000,
991 39000000,
992 52000000,
993 58500000,
994 65000000,
995 78000000,
996 0,
997 },
998 { 13500000,
999 27000000,
1000 40500000,
1001 54000000,
1002 81000000,
1003 108000000,
1004 121500000,
1005 135000000,
1006 162000000,
1007 180000000,
1008 },
1009 { 29300000,
1010 58500000,
1011 87800000,
1012 117000000,
1013 175500000,
1014 234000000,
1015 263300000,
1016 292500000,
1017 351000000,
1018 390000000,
1019 },
1020 { 58500000,
1021 117000000,
1022 175500000,
1023 234000000,
1024 351000000,
1025 468000000,
1026 526500000,
1027 585000000,
1028 702000000,
1029 780000000,
1030 },
1031 };
1032 u32 bitrate;
1033 int idx;
1034
1035 if (WARN_ON_ONCE(rate->mcs > 9))
1036 return 0;
1037
1038 idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1039 RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1040 rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1041 rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1042
1043 bitrate = base[idx][rate->mcs];
1044 bitrate *= rate->nss;
1045
1046 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1047 bitrate = (bitrate / 9) * 10;
1048
1049 /* do NOT round down here */
1050 return (bitrate + 50000) / 100000;
1051 }
1052
1053 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1054 {
1055 int modulation, streams, bitrate;
1056
1057 if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1058 !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1059 return rate->legacy;
1060 if (rate->flags & RATE_INFO_FLAGS_60G)
1061 return cfg80211_calculate_bitrate_60g(rate);
1062 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1063 return cfg80211_calculate_bitrate_vht(rate);
1064
1065 /* the formula below does only work for MCS values smaller than 32 */
1066 if (WARN_ON_ONCE(rate->mcs >= 32))
1067 return 0;
1068
1069 modulation = rate->mcs & 7;
1070 streams = (rate->mcs >> 3) + 1;
1071
1072 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1073 13500000 : 6500000;
1074
1075 if (modulation < 4)
1076 bitrate *= (modulation + 1);
1077 else if (modulation == 4)
1078 bitrate *= (modulation + 2);
1079 else
1080 bitrate *= (modulation + 3);
1081
1082 bitrate *= streams;
1083
1084 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1085 bitrate = (bitrate / 9) * 10;
1086
1087 /* do NOT round down here */
1088 return (bitrate + 50000) / 100000;
1089 }
1090 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1091
1092 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1093 enum ieee80211_p2p_attr_id attr,
1094 u8 *buf, unsigned int bufsize)
1095 {
1096 u8 *out = buf;
1097 u16 attr_remaining = 0;
1098 bool desired_attr = false;
1099 u16 desired_len = 0;
1100
1101 while (len > 0) {
1102 unsigned int iedatalen;
1103 unsigned int copy;
1104 const u8 *iedata;
1105
1106 if (len < 2)
1107 return -EILSEQ;
1108 iedatalen = ies[1];
1109 if (iedatalen + 2 > len)
1110 return -EILSEQ;
1111
1112 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1113 goto cont;
1114
1115 if (iedatalen < 4)
1116 goto cont;
1117
1118 iedata = ies + 2;
1119
1120 /* check WFA OUI, P2P subtype */
1121 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1122 iedata[2] != 0x9a || iedata[3] != 0x09)
1123 goto cont;
1124
1125 iedatalen -= 4;
1126 iedata += 4;
1127
1128 /* check attribute continuation into this IE */
1129 copy = min_t(unsigned int, attr_remaining, iedatalen);
1130 if (copy && desired_attr) {
1131 desired_len += copy;
1132 if (out) {
1133 memcpy(out, iedata, min(bufsize, copy));
1134 out += min(bufsize, copy);
1135 bufsize -= min(bufsize, copy);
1136 }
1137
1138
1139 if (copy == attr_remaining)
1140 return desired_len;
1141 }
1142
1143 attr_remaining -= copy;
1144 if (attr_remaining)
1145 goto cont;
1146
1147 iedatalen -= copy;
1148 iedata += copy;
1149
1150 while (iedatalen > 0) {
1151 u16 attr_len;
1152
1153 /* P2P attribute ID & size must fit */
1154 if (iedatalen < 3)
1155 return -EILSEQ;
1156 desired_attr = iedata[0] == attr;
1157 attr_len = get_unaligned_le16(iedata + 1);
1158 iedatalen -= 3;
1159 iedata += 3;
1160
1161 copy = min_t(unsigned int, attr_len, iedatalen);
1162
1163 if (desired_attr) {
1164 desired_len += copy;
1165 if (out) {
1166 memcpy(out, iedata, min(bufsize, copy));
1167 out += min(bufsize, copy);
1168 bufsize -= min(bufsize, copy);
1169 }
1170
1171 if (copy == attr_len)
1172 return desired_len;
1173 }
1174
1175 iedata += copy;
1176 iedatalen -= copy;
1177 attr_remaining = attr_len - copy;
1178 }
1179
1180 cont:
1181 len -= ies[1] + 2;
1182 ies += ies[1] + 2;
1183 }
1184
1185 if (attr_remaining && desired_attr)
1186 return -EILSEQ;
1187
1188 return -ENOENT;
1189 }
1190 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1191
1192 bool ieee80211_operating_class_to_band(u8 operating_class,
1193 enum ieee80211_band *band)
1194 {
1195 switch (operating_class) {
1196 case 112:
1197 case 115 ... 127:
1198 *band = IEEE80211_BAND_5GHZ;
1199 return true;
1200 case 81:
1201 case 82:
1202 case 83:
1203 case 84:
1204 *band = IEEE80211_BAND_2GHZ;
1205 return true;
1206 case 180:
1207 *band = IEEE80211_BAND_60GHZ;
1208 return true;
1209 }
1210
1211 return false;
1212 }
1213 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1214
1215 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1216 u32 beacon_int)
1217 {
1218 struct wireless_dev *wdev;
1219 int res = 0;
1220
1221 if (!beacon_int)
1222 return -EINVAL;
1223
1224 list_for_each_entry(wdev, &rdev->wdev_list, list) {
1225 if (!wdev->beacon_interval)
1226 continue;
1227 if (wdev->beacon_interval != beacon_int) {
1228 res = -EINVAL;
1229 break;
1230 }
1231 }
1232
1233 return res;
1234 }
1235
1236 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1237 struct wireless_dev *wdev,
1238 enum nl80211_iftype iftype,
1239 struct ieee80211_channel *chan,
1240 enum cfg80211_chan_mode chanmode,
1241 u8 radar_detect)
1242 {
1243 struct wireless_dev *wdev_iter;
1244 u32 used_iftypes = BIT(iftype);
1245 int num[NUM_NL80211_IFTYPES];
1246 struct ieee80211_channel
1247 *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1248 struct ieee80211_channel *ch;
1249 enum cfg80211_chan_mode chmode;
1250 int num_different_channels = 0;
1251 int total = 1;
1252 bool radar_required = false;
1253 int i, j;
1254
1255 ASSERT_RTNL();
1256
1257 if (WARN_ON(hweight32(radar_detect) > 1))
1258 return -EINVAL;
1259
1260 switch (iftype) {
1261 case NL80211_IFTYPE_ADHOC:
1262 case NL80211_IFTYPE_AP:
1263 case NL80211_IFTYPE_AP_VLAN:
1264 case NL80211_IFTYPE_MESH_POINT:
1265 case NL80211_IFTYPE_P2P_GO:
1266 case NL80211_IFTYPE_WDS:
1267 /* if the interface could potentially choose a DFS channel,
1268 * then mark DFS as required.
1269 */
1270 if (!chan) {
1271 if (chanmode != CHAN_MODE_UNDEFINED && radar_detect)
1272 radar_required = true;
1273 break;
1274 }
1275 radar_required = !!(chan->flags & IEEE80211_CHAN_RADAR);
1276 break;
1277 case NL80211_IFTYPE_P2P_CLIENT:
1278 case NL80211_IFTYPE_STATION:
1279 case NL80211_IFTYPE_P2P_DEVICE:
1280 case NL80211_IFTYPE_MONITOR:
1281 break;
1282 case NUM_NL80211_IFTYPES:
1283 case NL80211_IFTYPE_UNSPECIFIED:
1284 default:
1285 return -EINVAL;
1286 }
1287
1288 if (radar_required && !radar_detect)
1289 return -EINVAL;
1290
1291 /* Always allow software iftypes */
1292 if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1293 if (radar_detect)
1294 return -EINVAL;
1295 return 0;
1296 }
1297
1298 memset(num, 0, sizeof(num));
1299 memset(used_channels, 0, sizeof(used_channels));
1300
1301 num[iftype] = 1;
1302
1303 switch (chanmode) {
1304 case CHAN_MODE_UNDEFINED:
1305 break;
1306 case CHAN_MODE_SHARED:
1307 WARN_ON(!chan);
1308 used_channels[0] = chan;
1309 num_different_channels++;
1310 break;
1311 case CHAN_MODE_EXCLUSIVE:
1312 num_different_channels++;
1313 break;
1314 }
1315
1316 list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1317 if (wdev_iter == wdev)
1318 continue;
1319 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
1320 if (!wdev_iter->p2p_started)
1321 continue;
1322 } else if (wdev_iter->netdev) {
1323 if (!netif_running(wdev_iter->netdev))
1324 continue;
1325 } else {
1326 WARN_ON(1);
1327 }
1328
1329 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1330 continue;
1331
1332 /*
1333 * We may be holding the "wdev" mutex, but now need to lock
1334 * wdev_iter. This is OK because once we get here wdev_iter
1335 * is not wdev (tested above), but we need to use the nested
1336 * locking for lockdep.
1337 */
1338 mutex_lock_nested(&wdev_iter->mtx, 1);
1339 __acquire(wdev_iter->mtx);
1340 cfg80211_get_chan_state(wdev_iter, &ch, &chmode);
1341 wdev_unlock(wdev_iter);
1342
1343 switch (chmode) {
1344 case CHAN_MODE_UNDEFINED:
1345 break;
1346 case CHAN_MODE_SHARED:
1347 for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1348 if (!used_channels[i] || used_channels[i] == ch)
1349 break;
1350
1351 if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1352 return -EBUSY;
1353
1354 if (used_channels[i] == NULL) {
1355 used_channels[i] = ch;
1356 num_different_channels++;
1357 }
1358 break;
1359 case CHAN_MODE_EXCLUSIVE:
1360 num_different_channels++;
1361 break;
1362 }
1363
1364 num[wdev_iter->iftype]++;
1365 total++;
1366 used_iftypes |= BIT(wdev_iter->iftype);
1367 }
1368
1369 if (total == 1 && !radar_detect)
1370 return 0;
1371
1372 for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
1373 const struct ieee80211_iface_combination *c;
1374 struct ieee80211_iface_limit *limits;
1375 u32 all_iftypes = 0;
1376
1377 c = &rdev->wiphy.iface_combinations[i];
1378
1379 if (total > c->max_interfaces)
1380 continue;
1381 if (num_different_channels > c->num_different_channels)
1382 continue;
1383
1384 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1385 GFP_KERNEL);
1386 if (!limits)
1387 return -ENOMEM;
1388
1389 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1390 if (rdev->wiphy.software_iftypes & BIT(iftype))
1391 continue;
1392 for (j = 0; j < c->n_limits; j++) {
1393 all_iftypes |= limits[j].types;
1394 if (!(limits[j].types & BIT(iftype)))
1395 continue;
1396 if (limits[j].max < num[iftype])
1397 goto cont;
1398 limits[j].max -= num[iftype];
1399 }
1400 }
1401
1402 if (radar_detect && !(c->radar_detect_widths & radar_detect))
1403 goto cont;
1404
1405 /*
1406 * Finally check that all iftypes that we're currently
1407 * using are actually part of this combination. If they
1408 * aren't then we can't use this combination and have
1409 * to continue to the next.
1410 */
1411 if ((all_iftypes & used_iftypes) != used_iftypes)
1412 goto cont;
1413
1414 /*
1415 * This combination covered all interface types and
1416 * supported the requested numbers, so we're good.
1417 */
1418 kfree(limits);
1419 return 0;
1420 cont:
1421 kfree(limits);
1422 }
1423
1424 return -EBUSY;
1425 }
1426
1427 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1428 const u8 *rates, unsigned int n_rates,
1429 u32 *mask)
1430 {
1431 int i, j;
1432
1433 if (!sband)
1434 return -EINVAL;
1435
1436 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1437 return -EINVAL;
1438
1439 *mask = 0;
1440
1441 for (i = 0; i < n_rates; i++) {
1442 int rate = (rates[i] & 0x7f) * 5;
1443 bool found = false;
1444
1445 for (j = 0; j < sband->n_bitrates; j++) {
1446 if (sband->bitrates[j].bitrate == rate) {
1447 found = true;
1448 *mask |= BIT(j);
1449 break;
1450 }
1451 }
1452 if (!found)
1453 return -EINVAL;
1454 }
1455
1456 /*
1457 * mask must have at least one bit set here since we
1458 * didn't accept a 0-length rates array nor allowed
1459 * entries in the array that didn't exist
1460 */
1461
1462 return 0;
1463 }
1464
1465 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1466 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1467 const unsigned char rfc1042_header[] __aligned(2) =
1468 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1469 EXPORT_SYMBOL(rfc1042_header);
1470
1471 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1472 const unsigned char bridge_tunnel_header[] __aligned(2) =
1473 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1474 EXPORT_SYMBOL(bridge_tunnel_header);
Linus' kernel tree