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 struct cfg80211_qos_map *qos_map) 694 { 695 unsigned int dscp; 696 unsigned char vlan_priority; 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; 705 706 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 } 712 713 switch (skb->protocol) { 714 case htons(ETH_P_IP): 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; 719 break; 720 default: 721 return 0; 722 } 723 724 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 } 738 739 return dscp >> 5; 740 } 741 EXPORT_SYMBOL(cfg80211_classify8021d); 742 743 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie) 744 { 745 const struct cfg80211_bss_ies *ies; 746 747 ies = rcu_dereference(bss->ies); 748 if (!ies) 749 return NULL; 750 751 return cfg80211_find_ie(ie, ies->data, ies->len); 752 } 753 EXPORT_SYMBOL(ieee80211_bss_get_ie); 754 755 void 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; 767 if (rdev_add_key(rdev, dev, i, false, NULL, 768 &wdev->connect_keys->params[i])) { 769 netdev_err(dev, "failed to set key %d\n", i); 770 continue; 771 } 772 if (wdev->connect_keys->def == i) 773 if (rdev_set_default_key(rdev, dev, i, true, true)) { 774 netdev_err(dev, "failed to set defkey %d\n", i); 775 continue; 776 } 777 if (wdev->connect_keys->defmgmt == i) 778 if (rdev_set_default_mgmt_key(rdev, dev, i)) 779 netdev_err(dev, "failed to set mgtdef %d\n", i); 780 } 781 782 kfree(wdev->connect_keys); 783 wdev->connect_keys = NULL; 784 } 785 786 void cfg80211_process_wdev_events(struct wireless_dev *wdev) 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: 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); 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 } 834 835 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev) 836 { 837 struct wireless_dev *wdev; 838 839 ASSERT_RTNL(); 840 ASSERT_RDEV_LOCK(rdev); 841 842 list_for_each_entry(wdev, &rdev->wdev_list, list) 843 cfg80211_process_wdev_events(wdev); 844 } 845 846 int 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; 858 859 /* cannot change into P2P device type */ 860 if (ntype == NL80211_IFTYPE_P2P_DEVICE) 861 return -EOPNOTSUPP; 862 863 if (!rdev->ops->change_virtual_intf || 864 !(rdev->wiphy.interface_modes & (1 << ntype))) 865 return -EOPNOTSUPP; 866 867 /* if it's part of a bridge, reject changing type to station/ibss */ 868 if ((dev->priv_flags & IFF_BRIDGE_PORT) && 869 (ntype == NL80211_IFTYPE_ADHOC || 870 ntype == NL80211_IFTYPE_STATION || 871 ntype == NL80211_IFTYPE_P2P_CLIENT)) 872 return -EBUSY; 873 874 if (ntype != otype && netif_running(dev)) { 875 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr, 876 ntype); 877 if (err) 878 return err; 879 880 dev->ieee80211_ptr->use_4addr = false; 881 dev->ieee80211_ptr->mesh_id_up_len = 0; 882 wdev_lock(dev->ieee80211_ptr); 883 rdev_set_qos_map(rdev, dev, NULL); 884 wdev_unlock(dev->ieee80211_ptr); 885 886 switch (otype) { 887 case NL80211_IFTYPE_AP: 888 cfg80211_stop_ap(rdev, dev); 889 break; 890 case NL80211_IFTYPE_ADHOC: 891 cfg80211_leave_ibss(rdev, dev, false); 892 break; 893 case NL80211_IFTYPE_STATION: 894 case NL80211_IFTYPE_P2P_CLIENT: 895 wdev_lock(dev->ieee80211_ptr); 896 cfg80211_disconnect(rdev, dev, 897 WLAN_REASON_DEAUTH_LEAVING, true); 898 wdev_unlock(dev->ieee80211_ptr); 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 } 909 910 err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params); 911 912 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype); 913 914 if (!err && params && params->use_4addr != -1) 915 dev->ieee80211_ptr->use_4addr = params->use_4addr; 916 917 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 */ 924 case NL80211_IFTYPE_P2P_CLIENT: 925 case NL80211_IFTYPE_ADHOC: 926 dev->priv_flags |= IFF_DONT_BRIDGE; 927 break; 928 case NL80211_IFTYPE_P2P_GO: 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: 939 case NUM_NL80211_IFTYPES: 940 /* not happening */ 941 break; 942 case NL80211_IFTYPE_P2P_DEVICE: 943 WARN_ON(1); 944 break; 945 } 946 } 947 948 if (!err && ntype != otype && netif_running(dev)) { 949 cfg80211_update_iface_num(rdev, ntype, 1); 950 cfg80211_update_iface_num(rdev, otype, -1); 951 } 952 953 return err; 954 } 955 956 static 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 1003 static 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 1072 u32 cfg80211_calculate_bitrate(struct rate_info *rate) 1073 { 1074 int modulation, streams, bitrate; 1075 1076 if (!(rate->flags & RATE_INFO_FLAGS_MCS) && 1077 !(rate->flags & RATE_INFO_FLAGS_VHT_MCS)) 1078 return rate->legacy; 1079 if (rate->flags & RATE_INFO_FLAGS_60G) 1080 return cfg80211_calculate_bitrate_60g(rate); 1081 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS) 1082 return cfg80211_calculate_bitrate_vht(rate); 1083 1084 /* the formula below does only work for MCS values smaller than 32 */ 1085 if (WARN_ON_ONCE(rate->mcs >= 32)) 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 } 1109 EXPORT_SYMBOL(cfg80211_calculate_bitrate); 1110 1111 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len, 1112 enum ieee80211_p2p_attr_id attr, 1113 u8 *buf, unsigned int bufsize) 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 } 1209 EXPORT_SYMBOL(cfg80211_get_p2p_attr); 1210 1211 bool 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; 1225 case 180: 1226 *band = IEEE80211_BAND_60GHZ; 1227 return true; 1228 } 1229 1230 return false; 1231 } 1232 EXPORT_SYMBOL(ieee80211_operating_class_to_band); 1233 1234 int 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 1243 list_for_each_entry(wdev, &rdev->wdev_list, list) { 1244 if (!wdev->beacon_interval) 1245 continue; 1246 if (wdev->beacon_interval != beacon_int) { 1247 res = -EINVAL; 1248 break; 1249 } 1250 } 1251 1252 return res; 1253 } 1254 1255 int 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, 1259 enum cfg80211_chan_mode chanmode, 1260 u8 radar_detect) 1261 { 1262 struct wireless_dev *wdev_iter; 1263 u32 used_iftypes = BIT(iftype); 1264 int num[NUM_NL80211_IFTYPES]; 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; 1270 int total = 1; 1271 bool radar_required = false; 1272 int i, j; 1273 1274 ASSERT_RTNL(); 1275 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: 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); 1295 break; 1296 case NL80211_IFTYPE_P2P_CLIENT: 1297 case NL80211_IFTYPE_STATION: 1298 case NL80211_IFTYPE_P2P_DEVICE: 1299 case NL80211_IFTYPE_MONITOR: 1300 break; 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 1310 /* Always allow software iftypes */ 1311 if (rdev->wiphy.software_iftypes & BIT(iftype)) { 1312 if (radar_detect) 1313 return -EINVAL; 1314 return 0; 1315 } 1316 1317 memset(num, 0, sizeof(num)); 1318 memset(used_channels, 0, sizeof(used_channels)); 1319 1320 num[iftype] = 1; 1321 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 1335 list_for_each_entry(wdev_iter, &rdev->wdev_list, list) { 1336 if (wdev_iter == wdev) 1337 continue; 1338 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) { 1339 if (!wdev_iter->p2p_started) 1340 continue; 1341 } else if (wdev_iter->netdev) { 1342 if (!netif_running(wdev_iter->netdev)) 1343 continue; 1344 } else { 1345 WARN_ON(1); 1346 } 1347 1348 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype)) 1349 continue; 1350 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); 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 1370 if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS) 1371 return -EBUSY; 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 1383 num[wdev_iter->iftype]++; 1384 total++; 1385 used_iftypes |= BIT(wdev_iter->iftype); 1386 } 1387 1388 if (total == 1 && !radar_detect) 1389 return 0; 1390 1391 for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) { 1392 const struct ieee80211_iface_combination *c; 1393 struct ieee80211_iface_limit *limits; 1394 u32 all_iftypes = 0; 1395 1396 c = &rdev->wiphy.iface_combinations[i]; 1397 1398 if (total > c->max_interfaces) 1399 continue; 1400 if (num_different_channels > c->num_different_channels) 1401 continue; 1402 1403 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits, 1404 GFP_KERNEL); 1405 if (!limits) 1406 return -ENOMEM; 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++) { 1412 all_iftypes |= limits[j].types; 1413 if (!(limits[j].types & BIT(iftype))) 1414 continue; 1415 if (limits[j].max < num[iftype]) 1416 goto cont; 1417 limits[j].max -= num[iftype]; 1418 } 1419 } 1420 1421 if (radar_detect && !(c->radar_detect_widths & radar_detect)) 1422 goto cont; 1423 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 */ 1437 kfree(limits); 1438 return 0; 1439 cont: 1440 kfree(limits); 1441 } 1442 1443 return -EBUSY; 1444 } 1445 1446 int 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 1452 if (!sband) 1453 return -EINVAL; 1454 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 } 1483 1484 unsigned 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 } 1495 EXPORT_SYMBOL(ieee80211_get_num_supported_channels); 1496 1497 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ 1498 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ 1499 const unsigned char rfc1042_header[] __aligned(2) = 1500 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; 1501 EXPORT_SYMBOL(rfc1042_header); 1502 1503 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ 1504 const unsigned char bridge_tunnel_header[] __aligned(2) = 1505 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; 1506 EXPORT_SYMBOL(bridge_tunnel_header); 1507