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Merge git://www.linux-watchdog.org/linux-watchdog
[deliverable/linux.git] / net / wireless / util.c
CommitLineData
8318d78a
JB		 1/*
2 * Wireless utility functions
3 *
d3236553 4 * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
8318d78a 5 */
bc3b2d7f 6#include <linux/export.h>
d3236553 7#include <linux/bitops.h>
e31a16d6 8#include <linux/etherdevice.h>
5a0e3ad6 9#include <linux/slab.h>
d3236553 10#include <net/cfg80211.h>
e31a16d6 11#include <net/ip.h>
b156579b 12#include <net/dsfield.h>
c6ca5e28 13#include <linux/if_vlan.h>
8318d78a 14#include "core.h"
e35e4d28
HG		 15#include "rdev-ops.h"
16
8318d78a 17
bd815252
JB		 18struct ieee80211_rate *
19ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
881d948c 20 u32 basic_rates, int bitrate)
bd815252
JB		 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}
35EXPORT_SYMBOL(ieee80211_get_response_rate);
36
74608aca
SW		 37u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
38 enum nl80211_bss_scan_width scan_width)
b422c6cd
AN		 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
74608aca
SW		 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 {
b422c6cd 55 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
74608aca 56 }
b422c6cd
AN		 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}
64EXPORT_SYMBOL(ieee80211_mandatory_rates);
65
59eb21a6 66int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
8318d78a 67{
59eb21a6
BR		 68 /* see 802.11 17.3.8.3.2 and Annex J
69 * there are overlapping channel numbers in 5GHz and 2GHz bands */
3a0c52a6
VK		 70 if (chan <= 0)
71 return 0; /* not supported */
72 switch (band) {
73 case IEEE80211_BAND_2GHZ:
59eb21a6
BR		 74 if (chan == 14)
75 return 2484;
76 else if (chan < 14)
77 return 2407 + chan * 5;
3a0c52a6
VK		 78 break;
79 case IEEE80211_BAND_5GHZ:
80 if (chan >= 182 && chan <= 196)
81 return 4000 + chan * 5;
59eb21a6 82 else
3a0c52a6
VK		 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 ;
59eb21a6 91 }
3a0c52a6 92 return 0; /* not supported */
8318d78a
JB		 93}
94EXPORT_SYMBOL(ieee80211_channel_to_frequency);
95
96int ieee80211_frequency_to_channel(int freq)
97{
59eb21a6 98 /* see 802.11 17.3.8.3.2 and Annex J */
8318d78a
JB		 99 if (freq == 2484)
100 return 14;
59eb21a6 101 else if (freq < 2484)
8318d78a 102 return (freq - 2407) / 5;
59eb21a6
BR		 103 else if (freq >= 4910 && freq <= 4980)
104 return (freq - 4000) / 5;
3a0c52a6 105 else if (freq <= 45000) /* DMG band lower limit */
59eb21a6 106 return (freq - 5000) / 5;
3a0c52a6
VK		 107 else if (freq >= 58320 && freq <= 64800)
108 return (freq - 56160) / 2160;
109 else
110 return 0;
8318d78a
JB		 111}
112EXPORT_SYMBOL(ieee80211_frequency_to_channel);
113
6c507cd0
JB		 114struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
115 int freq)
906c730a
JB		 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}
6c507cd0 135EXPORT_SYMBOL(__ieee80211_get_channel);
906c730a 136
8318d78a
JB		 137static 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
aac09fbf
JB		 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)
8318d78a
JB		 181 sband->bitrates[i].flags |=
182 IEEE80211_RATE_ERP_G;
183 }
406f2388 184 WARN_ON(want != 0 && want != 3 && want != 6);
8318d78a 185 break;
3a0c52a6
VK		 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;
8318d78a
JB		 191 case IEEE80211_NUM_BANDS:
192 WARN_ON(1);
193 break;
194 }
195}
196
197void 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}
08645126 205
38ba3c57
JM		 206bool 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
fffd0934
JB		 215int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
216 struct key_params *params, int key_idx,
e31b8213 217 bool pairwise, const u8 *mac_addr)
08645126
JB		 218{
219 if (key_idx > 5)
220 return -EINVAL;
221
e31b8213
JB		 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
08645126
JB		 228 /*
229 * Disallow pairwise keys with non-zero index unless it's WEP
45cbad6a
JO		 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)
08645126 234 */
e31b8213 235 if (pairwise && key_idx &&
45cbad6a
JO		 236 ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
237 (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
238 (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
08645126
JB		 239 return -EINVAL;
240
08645126
JB		 241 switch (params->cipher) {
242 case WLAN_CIPHER_SUITE_WEP40:
8fc0fee0 243 if (params->key_len != WLAN_KEY_LEN_WEP40)
08645126
JB		 244 return -EINVAL;
245 break;
246 case WLAN_CIPHER_SUITE_TKIP:
8fc0fee0 247 if (params->key_len != WLAN_KEY_LEN_TKIP)
08645126
JB		 248 return -EINVAL;
249 break;
250 case WLAN_CIPHER_SUITE_CCMP:
8fc0fee0 251 if (params->key_len != WLAN_KEY_LEN_CCMP)
08645126
JB		 252 return -EINVAL;
253 break;
254 case WLAN_CIPHER_SUITE_WEP104:
8fc0fee0 255 if (params->key_len != WLAN_KEY_LEN_WEP104)
08645126
JB		 256 return -EINVAL;
257 break;
258 case WLAN_CIPHER_SUITE_AES_CMAC:
8fc0fee0 259 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
08645126
JB		 260 return -EINVAL;
261 break;
262 default:
7d64b7cc
JB		 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;
08645126
JB		 271 }
272
9f26a952
JM		 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
38ba3c57 288 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
fffd0934
JB		 289 return -EINVAL;
290
08645126
JB		 291 return 0;
292}
e31a16d6 293
633adf1a 294unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
e31a16d6
ZY		 295{
296 unsigned int hdrlen = 24;
297
298 if (ieee80211_is_data(fc)) {
299 if (ieee80211_has_a4(fc))
300 hdrlen = 30;
d0dd2de0 301 if (ieee80211_is_data_qos(fc)) {
e31a16d6 302 hdrlen += IEEE80211_QOS_CTL_LEN;
d0dd2de0
AT		 303 if (ieee80211_has_order(fc))
304 hdrlen += IEEE80211_HT_CTL_LEN;
305 }
e31a16d6
ZY		 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 }
324out:
325 return hdrlen;
326}
327EXPORT_SYMBOL(ieee80211_hdrlen);
328
329unsigned 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}
342EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
343
9b395bc3 344unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
e31a16d6
ZY		 345{
346 int ae = meshhdr->flags & MESH_FLAGS_AE;
7dd111e8 347 /* 802.11-2012, 8.2.4.7.3 */
e31a16d6 348 switch (ae) {
7dd111e8 349 default:
e31a16d6
ZY		 350 case 0:
351 return 6;
3c5772a5 352 case MESH_FLAGS_AE_A4:
e31a16d6 353 return 12;
3c5772a5 354 case MESH_FLAGS_AE_A5_A6:
e31a16d6 355 return 18;
e31a16d6
ZY		 356 }
357}
9b395bc3 358EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
e31a16d6 359
eaf85ca7 360int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
e31a16d6
ZY		 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 &&
074ac8df
JB		 390 iftype != NL80211_IFTYPE_AP_VLAN &&
391 iftype != NL80211_IFTYPE_P2P_GO))
e31a16d6
ZY		 392 return -1;
393 break;
394 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
395 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
f14543ee
FF		 396 iftype != NL80211_IFTYPE_MESH_POINT &&
397 iftype != NL80211_IFTYPE_AP_VLAN &&
398 iftype != NL80211_IFTYPE_STATION))
e31a16d6
ZY		 399 return -1;
400 if (iftype == NL80211_IFTYPE_MESH_POINT) {
401 struct ieee80211s_hdr *meshdr =
402 (struct ieee80211s_hdr *) (skb->data + hdrlen);
e3cf8b3f
ZY		 403 /* make sure meshdr->flags is on the linear part */
404 if (!pskb_may_pull(skb, hdrlen + 1))
405 return -1;
7dd111e8
JB		 406 if (meshdr->flags & MESH_FLAGS_AE_A4)
407 return -1;
e31a16d6 408 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
e3cf8b3f
ZY		 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);
e31a16d6 415 }
e3cf8b3f 416 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
e31a16d6
ZY		 417 }
418 break;
419 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
3c5772a5 420 if ((iftype != NL80211_IFTYPE_STATION &&
074ac8df
JB		 421 iftype != NL80211_IFTYPE_P2P_CLIENT &&
422 iftype != NL80211_IFTYPE_MESH_POINT) ||
e31a16d6 423 (is_multicast_ether_addr(dst) &&
4c764729 424 ether_addr_equal(src, addr)))
e31a16d6 425 return -1;
3c5772a5
JC		 426 if (iftype == NL80211_IFTYPE_MESH_POINT) {
427 struct ieee80211s_hdr *meshdr =
428 (struct ieee80211s_hdr *) (skb->data + hdrlen);
e3cf8b3f
ZY		 429 /* make sure meshdr->flags is on the linear part */
430 if (!pskb_may_pull(skb, hdrlen + 1))
431 return -1;
7dd111e8
JB		 432 if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
433 return -1;
3c5772a5 434 if (meshdr->flags & MESH_FLAGS_AE_A4)
e3cf8b3f
ZY		 435 skb_copy_bits(skb, hdrlen +
436 offsetof(struct ieee80211s_hdr, eaddr1),
437 src, ETH_ALEN);
438 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
3c5772a5 439 }
e31a16d6
ZY		 440 break;
441 case cpu_to_le16(0):
941c93cd
AN		 442 if (iftype != NL80211_IFTYPE_ADHOC &&
443 iftype != NL80211_IFTYPE_STATION)
444 return -1;
e31a16d6
ZY		 445 break;
446 }
447
e3cf8b3f 448 if (!pskb_may_pull(skb, hdrlen + 8))
e31a16d6
ZY		 449 return -1;
450
451 payload = skb->data + hdrlen;
452 ethertype = (payload[6] << 8) | payload[7];
453
4c764729 454 if (likely((ether_addr_equal(payload, rfc1042_header) &&
e31a16d6 455 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
4c764729 456 ether_addr_equal(payload, bridge_tunnel_header))) {
e31a16d6
ZY		 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}
475EXPORT_SYMBOL(ieee80211_data_to_8023);
476
eaf85ca7 477int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
e31a16d6
ZY		 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:
074ac8df 502 case NL80211_IFTYPE_P2P_GO:
e31a16d6
ZY		 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:
074ac8df 511 case NL80211_IFTYPE_P2P_CLIENT:
e31a16d6
ZY		 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;
e5c5d22e 544 } else if (ethertype >= ETH_P_802_3_MIN) {
e31a16d6
ZY		 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
24616152 564 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
e31a16d6 565 return -ENOMEM;
24616152 566
e31a16d6
ZY		 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}
590EXPORT_SYMBOL(ieee80211_data_from_8023);
591
eaf85ca7
ZY		 592
593void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
594 const u8 *addr, enum nl80211_iftype iftype,
8b3becad
YAP		 595 const unsigned int extra_headroom,
596 bool has_80211_header)
eaf85ca7
ZY		 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
8b3becad
YAP		 605 if (has_80211_header) {
606 err = ieee80211_data_to_8023(skb, addr, iftype);
607 if (err)
608 goto out;
eaf85ca7 609
8b3becad
YAP		 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 }
eaf85ca7
ZY		 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
ac422d3c 665 if (likely((ether_addr_equal(payload, rfc1042_header) &&
eaf85ca7 666 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
ac422d3c 667 ether_addr_equal(payload, bridge_tunnel_header))) {
eaf85ca7
ZY		 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}
689EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
690
e31a16d6 691/* Given a data frame determine the 802.1p/1d tag to use. */
fa9ffc74
KP		 692unsigned int cfg80211_classify8021d(struct sk_buff *skb,
693 struct cfg80211_qos_map *qos_map)
e31a16d6
ZY		 694{
695 unsigned int dscp;
c6ca5e28 696 unsigned char vlan_priority;
e31a16d6
ZY		 697
698 /* skb->priority values from 256->263 are magic values to
699 * directly indicate a specific 802.1d priority. This is used
700 * to allow 802.1d priority to be passed directly in from VLAN
701 * tags, etc.
702 */
703 if (skb->priority >= 256 && skb->priority <= 263)
704 return skb->priority - 256;
705
c6ca5e28
V		 706 if (vlan_tx_tag_present(skb)) {
707 vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK)
708 >> VLAN_PRIO_SHIFT;
709 if (vlan_priority > 0)
710 return vlan_priority;
711 }
712
e31a16d6
ZY		 713 switch (skb->protocol) {
714 case htons(ETH_P_IP):
b156579b
DT		 715 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
716 break;
717 case htons(ETH_P_IPV6):
718 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
e31a16d6
ZY		 719 break;
720 default:
721 return 0;
722 }
723
fa9ffc74
KP		 724 if (qos_map) {
725 unsigned int i, tmp_dscp = dscp >> 2;
726
727 for (i = 0; i < qos_map->num_des; i++) {
728 if (tmp_dscp == qos_map->dscp_exception[i].dscp)
729 return qos_map->dscp_exception[i].up;
730 }
731
732 for (i = 0; i < 8; i++) {
733 if (tmp_dscp >= qos_map->up[i].low &&
734 tmp_dscp <= qos_map->up[i].high)
735 return i;
736 }
737 }
738
e31a16d6
ZY		 739 return dscp >> 5;
740}
741EXPORT_SYMBOL(cfg80211_classify8021d);
517357c6
JB		 742
743const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
744{
9caf0364
JB		 745 const struct cfg80211_bss_ies *ies;
746
747 ies = rcu_dereference(bss->ies);
748 if (!ies)
517357c6 749 return NULL;
9caf0364
JB		 750
751 return cfg80211_find_ie(ie, ies->data, ies->len);
517357c6
JB		 752}
753EXPORT_SYMBOL(ieee80211_bss_get_ie);
fffd0934
JB		 754
755void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
756{
757 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
758 struct net_device *dev = wdev->netdev;
759 int i;
760
761 if (!wdev->connect_keys)
762 return;
763
764 for (i = 0; i < 6; i++) {
765 if (!wdev->connect_keys->params[i].cipher)
766 continue;
e35e4d28
HG		 767 if (rdev_add_key(rdev, dev, i, false, NULL,
768 &wdev->connect_keys->params[i])) {
e9c0268f 769 netdev_err(dev, "failed to set key %d\n", i);
1e056665
ZY		 770 continue;
771 }
fffd0934 772 if (wdev->connect_keys->def == i)
e35e4d28 773 if (rdev_set_default_key(rdev, dev, i, true, true)) {
e9c0268f 774 netdev_err(dev, "failed to set defkey %d\n", i);
1e056665
ZY		 775 continue;
776 }
fffd0934 777 if (wdev->connect_keys->defmgmt == i)
e35e4d28 778 if (rdev_set_default_mgmt_key(rdev, dev, i))
e9c0268f 779 netdev_err(dev, "failed to set mgtdef %d\n", i);
fffd0934
JB		 780 }
781
782 kfree(wdev->connect_keys);
783 wdev->connect_keys = NULL;
784}
3d54d255 785
1f6fc43e 786void cfg80211_process_wdev_events(struct wireless_dev *wdev)
3d54d255
JB		 787{
788 struct cfg80211_event *ev;
789 unsigned long flags;
790 const u8 *bssid = NULL;
791
792 spin_lock_irqsave(&wdev->event_lock, flags);
793 while (!list_empty(&wdev->event_list)) {
794 ev = list_first_entry(&wdev->event_list,
795 struct cfg80211_event, list);
796 list_del(&ev->list);
797 spin_unlock_irqrestore(&wdev->event_lock, flags);
798
799 wdev_lock(wdev);
800 switch (ev->type) {
801 case EVENT_CONNECT_RESULT:
802 if (!is_zero_ether_addr(ev->cr.bssid))
803 bssid = ev->cr.bssid;
804 __cfg80211_connect_result(
805 wdev->netdev, bssid,
806 ev->cr.req_ie, ev->cr.req_ie_len,
807 ev->cr.resp_ie, ev->cr.resp_ie_len,
808 ev->cr.status,
809 ev->cr.status == WLAN_STATUS_SUCCESS,
810 NULL);
811 break;
812 case EVENT_ROAMED:
adbde344
VT		 813 __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
814 ev->rm.req_ie_len, ev->rm.resp_ie,
815 ev->rm.resp_ie_len);
3d54d255
JB		 816 break;
817 case EVENT_DISCONNECTED:
818 __cfg80211_disconnected(wdev->netdev,
819 ev->dc.ie, ev->dc.ie_len,
820 ev->dc.reason, true);
821 break;
822 case EVENT_IBSS_JOINED:
823 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
824 break;
825 }
826 wdev_unlock(wdev);
827
828 kfree(ev);
829
830 spin_lock_irqsave(&wdev->event_lock, flags);
831 }
832 spin_unlock_irqrestore(&wdev->event_lock, flags);
833}
834
835void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
836{
837 struct wireless_dev *wdev;
838
839 ASSERT_RTNL();
840 ASSERT_RDEV_LOCK(rdev);
841
89a54e48 842 list_for_each_entry(wdev, &rdev->wdev_list, list)
3d54d255 843 cfg80211_process_wdev_events(wdev);
3d54d255
JB		 844}
845
846int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
847 struct net_device *dev, enum nl80211_iftype ntype,
848 u32 *flags, struct vif_params *params)
849{
850 int err;
851 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
852
853 ASSERT_RDEV_LOCK(rdev);
854
855 /* don't support changing VLANs, you just re-create them */
856 if (otype == NL80211_IFTYPE_AP_VLAN)
857 return -EOPNOTSUPP;
858
98104fde
JB		 859 /* cannot change into P2P device type */
860 if (ntype == NL80211_IFTYPE_P2P_DEVICE)
861 return -EOPNOTSUPP;
862
3d54d255
JB		 863 if (!rdev->ops->change_virtual_intf ||
864 !(rdev->wiphy.interface_modes & (1 << ntype)))
865 return -EOPNOTSUPP;
866
ad4bb6f8 867 /* if it's part of a bridge, reject changing type to station/ibss */
f350a0a8 868 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
074ac8df
JB		 869 (ntype == NL80211_IFTYPE_ADHOC ||
870 ntype == NL80211_IFTYPE_STATION ||
871 ntype == NL80211_IFTYPE_P2P_CLIENT))
ad4bb6f8
JB		 872 return -EBUSY;
873
f8cdddb8 874 if (ntype != otype && netif_running(dev)) {
7527a782
JB		 875 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
876 ntype);
877 if (err)
878 return err;
879
9bc383de 880 dev->ieee80211_ptr->use_4addr = false;
29cbe68c 881 dev->ieee80211_ptr->mesh_id_up_len = 0;
194ff52d 882 wdev_lock(dev->ieee80211_ptr);
fa9ffc74 883 rdev_set_qos_map(rdev, dev, NULL);
194ff52d 884 wdev_unlock(dev->ieee80211_ptr);
9bc383de 885
3d54d255 886 switch (otype) {
ac800140
MK		 887 case NL80211_IFTYPE_AP:
888 cfg80211_stop_ap(rdev, dev);
889 break;
3d54d255
JB		 890 case NL80211_IFTYPE_ADHOC:
891 cfg80211_leave_ibss(rdev, dev, false);
892 break;
893 case NL80211_IFTYPE_STATION:
074ac8df 894 case NL80211_IFTYPE_P2P_CLIENT:
83739b03 895 wdev_lock(dev->ieee80211_ptr);
3d54d255
JB		 896 cfg80211_disconnect(rdev, dev,
897 WLAN_REASON_DEAUTH_LEAVING, true);
83739b03 898 wdev_unlock(dev->ieee80211_ptr);
3d54d255
JB		 899 break;
900 case NL80211_IFTYPE_MESH_POINT:
901 /* mesh should be handled? */
902 break;
903 default:
904 break;
905 }
906
907 cfg80211_process_rdev_events(rdev);
908 }
909
e35e4d28 910 err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
3d54d255
JB		 911
912 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
913
9bc383de
JB		 914 if (!err && params && params->use_4addr != -1)
915 dev->ieee80211_ptr->use_4addr = params->use_4addr;
916
ad4bb6f8
JB		 917 if (!err) {
918 dev->priv_flags &= ~IFF_DONT_BRIDGE;
919 switch (ntype) {
920 case NL80211_IFTYPE_STATION:
921 if (dev->ieee80211_ptr->use_4addr)
922 break;
923 /* fall through */
074ac8df 924 case NL80211_IFTYPE_P2P_CLIENT:
ad4bb6f8
JB		 925 case NL80211_IFTYPE_ADHOC:
926 dev->priv_flags |= IFF_DONT_BRIDGE;
927 break;
074ac8df 928 case NL80211_IFTYPE_P2P_GO:
ad4bb6f8
JB		 929 case NL80211_IFTYPE_AP:
930 case NL80211_IFTYPE_AP_VLAN:
931 case NL80211_IFTYPE_WDS:
932 case NL80211_IFTYPE_MESH_POINT:
933 /* bridging OK */
934 break;
935 case NL80211_IFTYPE_MONITOR:
936 /* monitor can't bridge anyway */
937 break;
938 case NL80211_IFTYPE_UNSPECIFIED:
2e161f78 939 case NUM_NL80211_IFTYPES:
ad4bb6f8
JB		 940 /* not happening */
941 break;
98104fde
JB		 942 case NL80211_IFTYPE_P2P_DEVICE:
943 WARN_ON(1);
944 break;
ad4bb6f8
JB		 945 }
946 }
947
dbbae26a
MK		 948 if (!err && ntype != otype && netif_running(dev)) {
949 cfg80211_update_iface_num(rdev, ntype, 1);
950 cfg80211_update_iface_num(rdev, otype, -1);
951 }
952
3d54d255
JB		 953 return err;
954}
254416aa 955
95ddc1fc
VK		 956static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
957{
958 static const u32 __mcs2bitrate[] = {
959 /* control PHY */
960 [0] = 275,
961 /* SC PHY */
962 [1] = 3850,
963 [2] = 7700,
964 [3] = 9625,
965 [4] = 11550,
966 [5] = 12512, /* 1251.25 mbps */
967 [6] = 15400,
968 [7] = 19250,
969 [8] = 23100,
970 [9] = 25025,
971 [10] = 30800,
972 [11] = 38500,
973 [12] = 46200,
974 /* OFDM PHY */
975 [13] = 6930,
976 [14] = 8662, /* 866.25 mbps */
977 [15] = 13860,
978 [16] = 17325,
979 [17] = 20790,
980 [18] = 27720,
981 [19] = 34650,
982 [20] = 41580,
983 [21] = 45045,
984 [22] = 51975,
985 [23] = 62370,
986 [24] = 67568, /* 6756.75 mbps */
987 /* LP-SC PHY */
988 [25] = 6260,
989 [26] = 8340,
990 [27] = 11120,
991 [28] = 12510,
992 [29] = 16680,
993 [30] = 22240,
994 [31] = 25030,
995 };
996
997 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
998 return 0;
999
1000 return __mcs2bitrate[rate->mcs];
1001}
1002
db9c64cf
JB		 1003static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1004{
1005 static const u32 base[4][10] = {
1006 { 6500000,
1007 13000000,
1008 19500000,
1009 26000000,
1010 39000000,
1011 52000000,
1012 58500000,
1013 65000000,
1014 78000000,
1015 0,
1016 },
1017 { 13500000,
1018 27000000,
1019 40500000,
1020 54000000,
1021 81000000,
1022 108000000,
1023 121500000,
1024 135000000,
1025 162000000,
1026 180000000,
1027 },
1028 { 29300000,
1029 58500000,
1030 87800000,
1031 117000000,
1032 175500000,
1033 234000000,
1034 263300000,
1035 292500000,
1036 351000000,
1037 390000000,
1038 },
1039 { 58500000,
1040 117000000,
1041 175500000,
1042 234000000,
1043 351000000,
1044 468000000,
1045 526500000,
1046 585000000,
1047 702000000,
1048 780000000,
1049 },
1050 };
1051 u32 bitrate;
1052 int idx;
1053
1054 if (WARN_ON_ONCE(rate->mcs > 9))
1055 return 0;
1056
1057 idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH |
1058 RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 :
1059 rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 :
1060 rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0;
1061
1062 bitrate = base[idx][rate->mcs];
1063 bitrate *= rate->nss;
1064
1065 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1066 bitrate = (bitrate / 9) * 10;
1067
1068 /* do NOT round down here */
1069 return (bitrate + 50000) / 100000;
1070}
1071
8eb41c8d 1072u32 cfg80211_calculate_bitrate(struct rate_info *rate)
254416aa
JL		 1073{
1074 int modulation, streams, bitrate;
1075
db9c64cf
JB		 1076 if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1077 !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
254416aa 1078 return rate->legacy;
95ddc1fc
VK		 1079 if (rate->flags & RATE_INFO_FLAGS_60G)
1080 return cfg80211_calculate_bitrate_60g(rate);
db9c64cf
JB		 1081 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1082 return cfg80211_calculate_bitrate_vht(rate);
254416aa
JL		 1083
1084 /* the formula below does only work for MCS values smaller than 32 */
2615f375 1085 if (WARN_ON_ONCE(rate->mcs >= 32))
254416aa
JL		 1086 return 0;
1087
1088 modulation = rate->mcs & 7;
1089 streams = (rate->mcs >> 3) + 1;
1090
1091 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
1092 13500000 : 6500000;
1093
1094 if (modulation < 4)
1095 bitrate *= (modulation + 1);
1096 else if (modulation == 4)
1097 bitrate *= (modulation + 2);
1098 else
1099 bitrate *= (modulation + 3);
1100
1101 bitrate *= streams;
1102
1103 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1104 bitrate = (bitrate / 9) * 10;
1105
1106 /* do NOT round down here */
1107 return (bitrate + 50000) / 100000;
1108}
8097e149 1109EXPORT_SYMBOL(cfg80211_calculate_bitrate);
56d1893d 1110
c216e641
AS		 1111int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1112 enum ieee80211_p2p_attr_id attr,
1113 u8 *buf, unsigned int bufsize)
0ee45355
JB		 1114{
1115 u8 *out = buf;
1116 u16 attr_remaining = 0;
1117 bool desired_attr = false;
1118 u16 desired_len = 0;
1119
1120 while (len > 0) {
1121 unsigned int iedatalen;
1122 unsigned int copy;
1123 const u8 *iedata;
1124
1125 if (len < 2)
1126 return -EILSEQ;
1127 iedatalen = ies[1];
1128 if (iedatalen + 2 > len)
1129 return -EILSEQ;
1130
1131 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1132 goto cont;
1133
1134 if (iedatalen < 4)
1135 goto cont;
1136
1137 iedata = ies + 2;
1138
1139 /* check WFA OUI, P2P subtype */
1140 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1141 iedata[2] != 0x9a || iedata[3] != 0x09)
1142 goto cont;
1143
1144 iedatalen -= 4;
1145 iedata += 4;
1146
1147 /* check attribute continuation into this IE */
1148 copy = min_t(unsigned int, attr_remaining, iedatalen);
1149 if (copy && desired_attr) {
1150 desired_len += copy;
1151 if (out) {
1152 memcpy(out, iedata, min(bufsize, copy));
1153 out += min(bufsize, copy);
1154 bufsize -= min(bufsize, copy);
1155 }
1156
1157
1158 if (copy == attr_remaining)
1159 return desired_len;
1160 }
1161
1162 attr_remaining -= copy;
1163 if (attr_remaining)
1164 goto cont;
1165
1166 iedatalen -= copy;
1167 iedata += copy;
1168
1169 while (iedatalen > 0) {
1170 u16 attr_len;
1171
1172 /* P2P attribute ID & size must fit */
1173 if (iedatalen < 3)
1174 return -EILSEQ;
1175 desired_attr = iedata[0] == attr;
1176 attr_len = get_unaligned_le16(iedata + 1);
1177 iedatalen -= 3;
1178 iedata += 3;
1179
1180 copy = min_t(unsigned int, attr_len, iedatalen);
1181
1182 if (desired_attr) {
1183 desired_len += copy;
1184 if (out) {
1185 memcpy(out, iedata, min(bufsize, copy));
1186 out += min(bufsize, copy);
1187 bufsize -= min(bufsize, copy);
1188 }
1189
1190 if (copy == attr_len)
1191 return desired_len;
1192 }
1193
1194 iedata += copy;
1195 iedatalen -= copy;
1196 attr_remaining = attr_len - copy;
1197 }
1198
1199 cont:
1200 len -= ies[1] + 2;
1201 ies += ies[1] + 2;
1202 }
1203
1204 if (attr_remaining && desired_attr)
1205 return -EILSEQ;
1206
1207 return -ENOENT;
1208}
1209EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1210
1ce3e82b
JB		 1211bool ieee80211_operating_class_to_band(u8 operating_class,
1212 enum ieee80211_band *band)
1213{
1214 switch (operating_class) {
1215 case 112:
1216 case 115 ... 127:
1217 *band = IEEE80211_BAND_5GHZ;
1218 return true;
1219 case 81:
1220 case 82:
1221 case 83:
1222 case 84:
1223 *band = IEEE80211_BAND_2GHZ;
1224 return true;
55300a13
VK		 1225 case 180:
1226 *band = IEEE80211_BAND_60GHZ;
1227 return true;
1ce3e82b
JB		 1228 }
1229
1230 return false;
1231}
1232EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1233
56d1893d
JB		 1234int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1235 u32 beacon_int)
1236{
1237 struct wireless_dev *wdev;
1238 int res = 0;
1239
1240 if (!beacon_int)
1241 return -EINVAL;
1242
89a54e48 1243 list_for_each_entry(wdev, &rdev->wdev_list, list) {
56d1893d
JB		 1244 if (!wdev->beacon_interval)
1245 continue;
1246 if (wdev->beacon_interval != beacon_int) {
1247 res = -EINVAL;
1248 break;
1249 }
1250 }
1251
56d1893d
JB		 1252 return res;
1253}
7527a782 1254
d4e50c59
MK		 1255int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1256 struct wireless_dev *wdev,
1257 enum nl80211_iftype iftype,
1258 struct ieee80211_channel *chan,
11c4a075
SW		 1259 enum cfg80211_chan_mode chanmode,
1260 u8 radar_detect)
7527a782
JB		 1261{
1262 struct wireless_dev *wdev_iter;
463454b5 1263 u32 used_iftypes = BIT(iftype);
7527a782 1264 int num[NUM_NL80211_IFTYPES];
d4e50c59
MK		 1265 struct ieee80211_channel
1266 *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1267 struct ieee80211_channel *ch;
1268 enum cfg80211_chan_mode chmode;
1269 int num_different_channels = 0;
7527a782 1270 int total = 1;
5336fa88 1271 bool radar_required = false;
7527a782
JB		 1272 int i, j;
1273
1274 ASSERT_RTNL();
1275
11c4a075
SW		 1276 if (WARN_ON(hweight32(radar_detect) > 1))
1277 return -EINVAL;
1278
1279 switch (iftype) {
1280 case NL80211_IFTYPE_ADHOC:
1281 case NL80211_IFTYPE_AP:
1282 case NL80211_IFTYPE_AP_VLAN:
1283 case NL80211_IFTYPE_MESH_POINT:
1284 case NL80211_IFTYPE_P2P_GO:
1285 case NL80211_IFTYPE_WDS:
5336fa88
SW		 1286 /* if the interface could potentially choose a DFS channel,
1287 * then mark DFS as required.
1288 */
1289 if (!chan) {
1290 if (chanmode != CHAN_MODE_UNDEFINED && radar_detect)
1291 radar_required = true;
1292 break;
1293 }
1294 radar_required = !!(chan->flags & IEEE80211_CHAN_RADAR);
11c4a075
SW		 1295 break;
1296 case NL80211_IFTYPE_P2P_CLIENT:
1297 case NL80211_IFTYPE_STATION:
bba87ffe 1298 case NL80211_IFTYPE_P2P_DEVICE:
11c4a075 1299 case NL80211_IFTYPE_MONITOR:
11c4a075 1300 break;
11c4a075
SW		 1301 case NUM_NL80211_IFTYPES:
1302 case NL80211_IFTYPE_UNSPECIFIED:
1303 default:
1304 return -EINVAL;
1305 }
1306
1307 if (radar_required && !radar_detect)
1308 return -EINVAL;
1309
7527a782 1310 /* Always allow software iftypes */
11c4a075
SW		 1311 if (rdev->wiphy.software_iftypes & BIT(iftype)) {
1312 if (radar_detect)
1313 return -EINVAL;
7527a782 1314 return 0;
11c4a075 1315 }
7527a782 1316
7527a782 1317 memset(num, 0, sizeof(num));
d4e50c59 1318 memset(used_channels, 0, sizeof(used_channels));
7527a782
JB		 1319
1320 num[iftype] = 1;
1321
d4e50c59
MK		 1322 switch (chanmode) {
1323 case CHAN_MODE_UNDEFINED:
1324 break;
1325 case CHAN_MODE_SHARED:
1326 WARN_ON(!chan);
1327 used_channels[0] = chan;
1328 num_different_channels++;
1329 break;
1330 case CHAN_MODE_EXCLUSIVE:
1331 num_different_channels++;
1332 break;
1333 }
1334
89a54e48 1335 list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
7527a782
JB		 1336 if (wdev_iter == wdev)
1337 continue;
6e3ab554 1338 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
98104fde
JB		 1339 if (!wdev_iter->p2p_started)
1340 continue;
6e3ab554
JB		 1341 } else if (wdev_iter->netdev) {
1342 if (!netif_running(wdev_iter->netdev))
1343 continue;
98104fde
JB		 1344 } else {
1345 WARN_ON(1);
1346 }
7527a782
JB		 1347
1348 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1349 continue;
1350
8e95ea49
JB		 1351 /*
1352 * We may be holding the "wdev" mutex, but now need to lock
1353 * wdev_iter. This is OK because once we get here wdev_iter
1354 * is not wdev (tested above), but we need to use the nested
1355 * locking for lockdep.
1356 */
1357 mutex_lock_nested(&wdev_iter->mtx, 1);
1358 __acquire(wdev_iter->mtx);
1359 cfg80211_get_chan_state(wdev_iter, &ch, &chmode);
1360 wdev_unlock(wdev_iter);
d4e50c59
MK		 1361
1362 switch (chmode) {
1363 case CHAN_MODE_UNDEFINED:
1364 break;
1365 case CHAN_MODE_SHARED:
1366 for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1367 if (!used_channels[i] || used_channels[i] == ch)
1368 break;
1369
e4e32459 1370 if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
d4e50c59 1371 return -EBUSY;
d4e50c59
MK		 1372
1373 if (used_channels[i] == NULL) {
1374 used_channels[i] = ch;
1375 num_different_channels++;
1376 }
1377 break;
1378 case CHAN_MODE_EXCLUSIVE:
1379 num_different_channels++;
1380 break;
1381 }
1382
7527a782
JB		 1383 num[wdev_iter->iftype]++;
1384 total++;
463454b5 1385 used_iftypes |= BIT(wdev_iter->iftype);
7527a782 1386 }
7527a782 1387
11c4a075 1388 if (total == 1 && !radar_detect)
8e8b41f9
JB		 1389 return 0;
1390
7527a782
JB		 1391 for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
1392 const struct ieee80211_iface_combination *c;
1393 struct ieee80211_iface_limit *limits;
463454b5 1394 u32 all_iftypes = 0;
7527a782
JB		 1395
1396 c = &rdev->wiphy.iface_combinations[i];
1397
d4e50c59
MK		 1398 if (total > c->max_interfaces)
1399 continue;
1400 if (num_different_channels > c->num_different_channels)
1401 continue;
1402
7527a782
JB		 1403 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1404 GFP_KERNEL);
1405 if (!limits)
1406 return -ENOMEM;
7527a782
JB		 1407
1408 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1409 if (rdev->wiphy.software_iftypes & BIT(iftype))
1410 continue;
1411 for (j = 0; j < c->n_limits; j++) {
463454b5 1412 all_iftypes |= limits[j].types;
e55a4046 1413 if (!(limits[j].types & BIT(iftype)))
7527a782
JB		 1414 continue;
1415 if (limits[j].max < num[iftype])
1416 goto cont;
1417 limits[j].max -= num[iftype];
1418 }
1419 }
463454b5 1420
11c4a075
SW		 1421 if (radar_detect && !(c->radar_detect_widths & radar_detect))
1422 goto cont;
1423
463454b5
JB		 1424 /*
1425 * Finally check that all iftypes that we're currently
1426 * using are actually part of this combination. If they
1427 * aren't then we can't use this combination and have
1428 * to continue to the next.
1429 */
1430 if ((all_iftypes & used_iftypes) != used_iftypes)
1431 goto cont;
1432
1433 /*
1434 * This combination covered all interface types and
1435 * supported the requested numbers, so we're good.
1436 */
7527a782
JB		 1437 kfree(limits);
1438 return 0;
1439 cont:
1440 kfree(limits);
1441 }
1442
1443 return -EBUSY;
1444}
34850ab2
JB		 1445
1446int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1447 const u8 *rates, unsigned int n_rates,
1448 u32 *mask)
1449{
1450 int i, j;
1451
a401d2bb
JB		 1452 if (!sband)
1453 return -EINVAL;
1454
34850ab2
JB		 1455 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1456 return -EINVAL;
1457
1458 *mask = 0;
1459
1460 for (i = 0; i < n_rates; i++) {
1461 int rate = (rates[i] & 0x7f) * 5;
1462 bool found = false;
1463
1464 for (j = 0; j < sband->n_bitrates; j++) {
1465 if (sband->bitrates[j].bitrate == rate) {
1466 found = true;
1467 *mask |= BIT(j);
1468 break;
1469 }
1470 }
1471 if (!found)
1472 return -EINVAL;
1473 }
1474
1475 /*
1476 * mask must have at least one bit set here since we
1477 * didn't accept a 0-length rates array nor allowed
1478 * entries in the array that didn't exist
1479 */
1480
1481 return 0;
1482}
11a2a357 1483
bdfbec2d
IP		 1484unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1485{
1486 enum ieee80211_band band;
1487 unsigned int n_channels = 0;
1488
1489 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1490 if (wiphy->bands[band])
1491 n_channels += wiphy->bands[band]->n_channels;
1492
1493 return n_channels;
1494}
1495EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1496
11a2a357
JB		 1497/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1498/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1499const unsigned char rfc1042_header[] __aligned(2) =
1500 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1501EXPORT_SYMBOL(rfc1042_header);
1502
1503/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1504const unsigned char bridge_tunnel_header[] __aligned(2) =
1505 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1506EXPORT_SYMBOL(bridge_tunnel_header);
Linux kernel - Deliverables
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