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