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); 1475