1 /* 2 * Wireless utility functions 3 * 4 * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net> 5 * Copyright 2013-2014 Intel Mobile Communications GmbH 6 */ 7 #include <linux/export.h> 8 #include <linux/bitops.h> 9 #include <linux/etherdevice.h> 10 #include <linux/slab.h> 11 #include <net/cfg80211.h> 12 #include <net/ip.h> 13 #include <net/dsfield.h> 14 #include <linux/if_vlan.h> 15 #include <linux/mpls.h> 16 #include "core.h" 17 #include "rdev-ops.h" 18 19 20 struct ieee80211_rate * 21 ieee80211_get_response_rate(struct ieee80211_supported_band *sband, 22 u32 basic_rates, int bitrate) 23 { 24 struct ieee80211_rate *result = &sband->bitrates[0]; 25 int i; 26 27 for (i = 0; i < sband->n_bitrates; i++) { 28 if (!(basic_rates & BIT(i))) 29 continue; 30 if (sband->bitrates[i].bitrate > bitrate) 31 continue; 32 result = &sband->bitrates[i]; 33 } 34 35 return result; 36 } 37 EXPORT_SYMBOL(ieee80211_get_response_rate); 38 39 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband, 40 enum nl80211_bss_scan_width scan_width) 41 { 42 struct ieee80211_rate *bitrates; 43 u32 mandatory_rates = 0; 44 enum ieee80211_rate_flags mandatory_flag; 45 int i; 46 47 if (WARN_ON(!sband)) 48 return 1; 49 50 if (sband->band == IEEE80211_BAND_2GHZ) { 51 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 || 52 scan_width == NL80211_BSS_CHAN_WIDTH_10) 53 mandatory_flag = IEEE80211_RATE_MANDATORY_G; 54 else 55 mandatory_flag = IEEE80211_RATE_MANDATORY_B; 56 } else { 57 mandatory_flag = IEEE80211_RATE_MANDATORY_A; 58 } 59 60 bitrates = sband->bitrates; 61 for (i = 0; i < sband->n_bitrates; i++) 62 if (bitrates[i].flags & mandatory_flag) 63 mandatory_rates |= BIT(i); 64 return mandatory_rates; 65 } 66 EXPORT_SYMBOL(ieee80211_mandatory_rates); 67 68 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band) 69 { 70 /* see 802.11 17.3.8.3.2 and Annex J 71 * there are overlapping channel numbers in 5GHz and 2GHz bands */ 72 if (chan <= 0) 73 return 0; /* not supported */ 74 switch (band) { 75 case IEEE80211_BAND_2GHZ: 76 if (chan == 14) 77 return 2484; 78 else if (chan < 14) 79 return 2407 + chan * 5; 80 break; 81 case IEEE80211_BAND_5GHZ: 82 if (chan >= 182 && chan <= 196) 83 return 4000 + chan * 5; 84 else 85 return 5000 + chan * 5; 86 break; 87 case IEEE80211_BAND_60GHZ: 88 if (chan < 5) 89 return 56160 + chan * 2160; 90 break; 91 default: 92 ; 93 } 94 return 0; /* not supported */ 95 } 96 EXPORT_SYMBOL(ieee80211_channel_to_frequency); 97 98 int ieee80211_frequency_to_channel(int freq) 99 { 100 /* see 802.11 17.3.8.3.2 and Annex J */ 101 if (freq == 2484) 102 return 14; 103 else if (freq < 2484) 104 return (freq - 2407) / 5; 105 else if (freq >= 4910 && freq <= 4980) 106 return (freq - 4000) / 5; 107 else if (freq <= 45000) /* DMG band lower limit */ 108 return (freq - 5000) / 5; 109 else if (freq >= 58320 && freq <= 64800) 110 return (freq - 56160) / 2160; 111 else 112 return 0; 113 } 114 EXPORT_SYMBOL(ieee80211_frequency_to_channel); 115 116 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy, 117 int freq) 118 { 119 enum ieee80211_band band; 120 struct ieee80211_supported_band *sband; 121 int i; 122 123 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 124 sband = wiphy->bands[band]; 125 126 if (!sband) 127 continue; 128 129 for (i = 0; i < sband->n_channels; i++) { 130 if (sband->channels[i].center_freq == freq) 131 return &sband->channels[i]; 132 } 133 } 134 135 return NULL; 136 } 137 EXPORT_SYMBOL(__ieee80211_get_channel); 138 139 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband, 140 enum ieee80211_band band) 141 { 142 int i, want; 143 144 switch (band) { 145 case IEEE80211_BAND_5GHZ: 146 want = 3; 147 for (i = 0; i < sband->n_bitrates; i++) { 148 if (sband->bitrates[i].bitrate == 60 || 149 sband->bitrates[i].bitrate == 120 || 150 sband->bitrates[i].bitrate == 240) { 151 sband->bitrates[i].flags |= 152 IEEE80211_RATE_MANDATORY_A; 153 want--; 154 } 155 } 156 WARN_ON(want); 157 break; 158 case IEEE80211_BAND_2GHZ: 159 want = 7; 160 for (i = 0; i < sband->n_bitrates; i++) { 161 if (sband->bitrates[i].bitrate == 10) { 162 sband->bitrates[i].flags |= 163 IEEE80211_RATE_MANDATORY_B | 164 IEEE80211_RATE_MANDATORY_G; 165 want--; 166 } 167 168 if (sband->bitrates[i].bitrate == 20 || 169 sband->bitrates[i].bitrate == 55 || 170 sband->bitrates[i].bitrate == 110 || 171 sband->bitrates[i].bitrate == 60 || 172 sband->bitrates[i].bitrate == 120 || 173 sband->bitrates[i].bitrate == 240) { 174 sband->bitrates[i].flags |= 175 IEEE80211_RATE_MANDATORY_G; 176 want--; 177 } 178 179 if (sband->bitrates[i].bitrate != 10 && 180 sband->bitrates[i].bitrate != 20 && 181 sband->bitrates[i].bitrate != 55 && 182 sband->bitrates[i].bitrate != 110) 183 sband->bitrates[i].flags |= 184 IEEE80211_RATE_ERP_G; 185 } 186 WARN_ON(want != 0 && want != 3 && want != 6); 187 break; 188 case IEEE80211_BAND_60GHZ: 189 /* check for mandatory HT MCS 1..4 */ 190 WARN_ON(!sband->ht_cap.ht_supported); 191 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e); 192 break; 193 case IEEE80211_NUM_BANDS: 194 WARN_ON(1); 195 break; 196 } 197 } 198 199 void ieee80211_set_bitrate_flags(struct wiphy *wiphy) 200 { 201 enum ieee80211_band band; 202 203 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 204 if (wiphy->bands[band]) 205 set_mandatory_flags_band(wiphy->bands[band], band); 206 } 207 208 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher) 209 { 210 int i; 211 for (i = 0; i < wiphy->n_cipher_suites; i++) 212 if (cipher == wiphy->cipher_suites[i]) 213 return true; 214 return false; 215 } 216 217 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev, 218 struct key_params *params, int key_idx, 219 bool pairwise, const u8 *mac_addr) 220 { 221 if (key_idx > 5) 222 return -EINVAL; 223 224 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN)) 225 return -EINVAL; 226 227 if (pairwise && !mac_addr) 228 return -EINVAL; 229 230 /* 231 * Disallow pairwise keys with non-zero index unless it's WEP 232 * or a vendor specific cipher (because current deployments use 233 * pairwise WEP keys with non-zero indices and for vendor specific 234 * ciphers this should be validated in the driver or hardware level 235 * - but 802.11i clearly specifies to use zero) 236 */ 237 if (pairwise && key_idx && 238 ((params->cipher == WLAN_CIPHER_SUITE_TKIP) || 239 (params->cipher == WLAN_CIPHER_SUITE_CCMP) || 240 (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC))) 241 return -EINVAL; 242 243 switch (params->cipher) { 244 case WLAN_CIPHER_SUITE_WEP40: 245 if (params->key_len != WLAN_KEY_LEN_WEP40) 246 return -EINVAL; 247 break; 248 case WLAN_CIPHER_SUITE_TKIP: 249 if (params->key_len != WLAN_KEY_LEN_TKIP) 250 return -EINVAL; 251 break; 252 case WLAN_CIPHER_SUITE_CCMP: 253 if (params->key_len != WLAN_KEY_LEN_CCMP) 254 return -EINVAL; 255 break; 256 case WLAN_CIPHER_SUITE_WEP104: 257 if (params->key_len != WLAN_KEY_LEN_WEP104) 258 return -EINVAL; 259 break; 260 case WLAN_CIPHER_SUITE_AES_CMAC: 261 if (params->key_len != WLAN_KEY_LEN_AES_CMAC) 262 return -EINVAL; 263 break; 264 default: 265 /* 266 * We don't know anything about this algorithm, 267 * allow using it -- but the driver must check 268 * all parameters! We still check below whether 269 * or not the driver supports this algorithm, 270 * of course. 271 */ 272 break; 273 } 274 275 if (params->seq) { 276 switch (params->cipher) { 277 case WLAN_CIPHER_SUITE_WEP40: 278 case WLAN_CIPHER_SUITE_WEP104: 279 /* These ciphers do not use key sequence */ 280 return -EINVAL; 281 case WLAN_CIPHER_SUITE_TKIP: 282 case WLAN_CIPHER_SUITE_CCMP: 283 case WLAN_CIPHER_SUITE_AES_CMAC: 284 if (params->seq_len != 6) 285 return -EINVAL; 286 break; 287 } 288 } 289 290 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher)) 291 return -EINVAL; 292 293 return 0; 294 } 295 296 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc) 297 { 298 unsigned int hdrlen = 24; 299 300 if (ieee80211_is_data(fc)) { 301 if (ieee80211_has_a4(fc)) 302 hdrlen = 30; 303 if (ieee80211_is_data_qos(fc)) { 304 hdrlen += IEEE80211_QOS_CTL_LEN; 305 if (ieee80211_has_order(fc)) 306 hdrlen += IEEE80211_HT_CTL_LEN; 307 } 308 goto out; 309 } 310 311 if (ieee80211_is_ctl(fc)) { 312 /* 313 * ACK and CTS are 10 bytes, all others 16. To see how 314 * to get this condition consider 315 * subtype mask: 0b0000000011110000 (0x00F0) 316 * ACK subtype: 0b0000000011010000 (0x00D0) 317 * CTS subtype: 0b0000000011000000 (0x00C0) 318 * bits that matter: ^^^ (0x00E0) 319 * value of those: 0b0000000011000000 (0x00C0) 320 */ 321 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0)) 322 hdrlen = 10; 323 else 324 hdrlen = 16; 325 } 326 out: 327 return hdrlen; 328 } 329 EXPORT_SYMBOL(ieee80211_hdrlen); 330 331 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) 332 { 333 const struct ieee80211_hdr *hdr = 334 (const struct ieee80211_hdr *)skb->data; 335 unsigned int hdrlen; 336 337 if (unlikely(skb->len < 10)) 338 return 0; 339 hdrlen = ieee80211_hdrlen(hdr->frame_control); 340 if (unlikely(hdrlen > skb->len)) 341 return 0; 342 return hdrlen; 343 } 344 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); 345 346 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) 347 { 348 int ae = meshhdr->flags & MESH_FLAGS_AE; 349 /* 802.11-2012, 8.2.4.7.3 */ 350 switch (ae) { 351 default: 352 case 0: 353 return 6; 354 case MESH_FLAGS_AE_A4: 355 return 12; 356 case MESH_FLAGS_AE_A5_A6: 357 return 18; 358 } 359 } 360 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen); 361 362 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, 363 enum nl80211_iftype iftype) 364 { 365 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 366 u16 hdrlen, ethertype; 367 u8 *payload; 368 u8 dst[ETH_ALEN]; 369 u8 src[ETH_ALEN] __aligned(2); 370 371 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 372 return -1; 373 374 hdrlen = ieee80211_hdrlen(hdr->frame_control); 375 376 /* convert IEEE 802.11 header + possible LLC headers into Ethernet 377 * header 378 * IEEE 802.11 address fields: 379 * ToDS FromDS Addr1 Addr2 Addr3 Addr4 380 * 0 0 DA SA BSSID n/a 381 * 0 1 DA BSSID SA n/a 382 * 1 0 BSSID SA DA n/a 383 * 1 1 RA TA DA SA 384 */ 385 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); 386 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); 387 388 switch (hdr->frame_control & 389 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { 390 case cpu_to_le16(IEEE80211_FCTL_TODS): 391 if (unlikely(iftype != NL80211_IFTYPE_AP && 392 iftype != NL80211_IFTYPE_AP_VLAN && 393 iftype != NL80211_IFTYPE_P2P_GO)) 394 return -1; 395 break; 396 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): 397 if (unlikely(iftype != NL80211_IFTYPE_WDS && 398 iftype != NL80211_IFTYPE_MESH_POINT && 399 iftype != NL80211_IFTYPE_AP_VLAN && 400 iftype != NL80211_IFTYPE_STATION)) 401 return -1; 402 if (iftype == NL80211_IFTYPE_MESH_POINT) { 403 struct ieee80211s_hdr *meshdr = 404 (struct ieee80211s_hdr *) (skb->data + hdrlen); 405 /* make sure meshdr->flags is on the linear part */ 406 if (!pskb_may_pull(skb, hdrlen + 1)) 407 return -1; 408 if (meshdr->flags & MESH_FLAGS_AE_A4) 409 return -1; 410 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { 411 skb_copy_bits(skb, hdrlen + 412 offsetof(struct ieee80211s_hdr, eaddr1), 413 dst, ETH_ALEN); 414 skb_copy_bits(skb, hdrlen + 415 offsetof(struct ieee80211s_hdr, eaddr2), 416 src, ETH_ALEN); 417 } 418 hdrlen += ieee80211_get_mesh_hdrlen(meshdr); 419 } 420 break; 421 case cpu_to_le16(IEEE80211_FCTL_FROMDS): 422 if ((iftype != NL80211_IFTYPE_STATION && 423 iftype != NL80211_IFTYPE_P2P_CLIENT && 424 iftype != NL80211_IFTYPE_MESH_POINT) || 425 (is_multicast_ether_addr(dst) && 426 ether_addr_equal(src, addr))) 427 return -1; 428 if (iftype == NL80211_IFTYPE_MESH_POINT) { 429 struct ieee80211s_hdr *meshdr = 430 (struct ieee80211s_hdr *) (skb->data + hdrlen); 431 /* make sure meshdr->flags is on the linear part */ 432 if (!pskb_may_pull(skb, hdrlen + 1)) 433 return -1; 434 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) 435 return -1; 436 if (meshdr->flags & MESH_FLAGS_AE_A4) 437 skb_copy_bits(skb, hdrlen + 438 offsetof(struct ieee80211s_hdr, eaddr1), 439 src, ETH_ALEN); 440 hdrlen += ieee80211_get_mesh_hdrlen(meshdr); 441 } 442 break; 443 case cpu_to_le16(0): 444 if (iftype != NL80211_IFTYPE_ADHOC && 445 iftype != NL80211_IFTYPE_STATION && 446 iftype != NL80211_IFTYPE_OCB) 447 return -1; 448 break; 449 } 450 451 if (!pskb_may_pull(skb, hdrlen + 8)) 452 return -1; 453 454 payload = skb->data + hdrlen; 455 ethertype = (payload[6] << 8) | payload[7]; 456 457 if (likely((ether_addr_equal(payload, rfc1042_header) && 458 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || 459 ether_addr_equal(payload, bridge_tunnel_header))) { 460 /* remove RFC1042 or Bridge-Tunnel encapsulation and 461 * replace EtherType */ 462 skb_pull(skb, hdrlen + 6); 463 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); 464 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); 465 } else { 466 struct ethhdr *ehdr; 467 __be16 len; 468 469 skb_pull(skb, hdrlen); 470 len = htons(skb->len); 471 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); 472 memcpy(ehdr->h_dest, dst, ETH_ALEN); 473 memcpy(ehdr->h_source, src, ETH_ALEN); 474 ehdr->h_proto = len; 475 } 476 return 0; 477 } 478 EXPORT_SYMBOL(ieee80211_data_to_8023); 479 480 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr, 481 enum nl80211_iftype iftype, 482 const u8 *bssid, bool qos) 483 { 484 struct ieee80211_hdr hdr; 485 u16 hdrlen, ethertype; 486 __le16 fc; 487 const u8 *encaps_data; 488 int encaps_len, skip_header_bytes; 489 int nh_pos, h_pos; 490 int head_need; 491 492 if (unlikely(skb->len < ETH_HLEN)) 493 return -EINVAL; 494 495 nh_pos = skb_network_header(skb) - skb->data; 496 h_pos = skb_transport_header(skb) - skb->data; 497 498 /* convert Ethernet header to proper 802.11 header (based on 499 * operation mode) */ 500 ethertype = (skb->data[12] << 8) | skb->data[13]; 501 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 502 503 switch (iftype) { 504 case NL80211_IFTYPE_AP: 505 case NL80211_IFTYPE_AP_VLAN: 506 case NL80211_IFTYPE_P2P_GO: 507 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 508 /* DA BSSID SA */ 509 memcpy(hdr.addr1, skb->data, ETH_ALEN); 510 memcpy(hdr.addr2, addr, ETH_ALEN); 511 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 512 hdrlen = 24; 513 break; 514 case NL80211_IFTYPE_STATION: 515 case NL80211_IFTYPE_P2P_CLIENT: 516 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 517 /* BSSID SA DA */ 518 memcpy(hdr.addr1, bssid, ETH_ALEN); 519 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 520 memcpy(hdr.addr3, skb->data, ETH_ALEN); 521 hdrlen = 24; 522 break; 523 case NL80211_IFTYPE_OCB: 524 case NL80211_IFTYPE_ADHOC: 525 /* DA SA BSSID */ 526 memcpy(hdr.addr1, skb->data, ETH_ALEN); 527 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 528 memcpy(hdr.addr3, bssid, ETH_ALEN); 529 hdrlen = 24; 530 break; 531 default: 532 return -EOPNOTSUPP; 533 } 534 535 if (qos) { 536 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 537 hdrlen += 2; 538 } 539 540 hdr.frame_control = fc; 541 hdr.duration_id = 0; 542 hdr.seq_ctrl = 0; 543 544 skip_header_bytes = ETH_HLEN; 545 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 546 encaps_data = bridge_tunnel_header; 547 encaps_len = sizeof(bridge_tunnel_header); 548 skip_header_bytes -= 2; 549 } else if (ethertype >= ETH_P_802_3_MIN) { 550 encaps_data = rfc1042_header; 551 encaps_len = sizeof(rfc1042_header); 552 skip_header_bytes -= 2; 553 } else { 554 encaps_data = NULL; 555 encaps_len = 0; 556 } 557 558 skb_pull(skb, skip_header_bytes); 559 nh_pos -= skip_header_bytes; 560 h_pos -= skip_header_bytes; 561 562 head_need = hdrlen + encaps_len - skb_headroom(skb); 563 564 if (head_need > 0 || skb_cloned(skb)) { 565 head_need = max(head_need, 0); 566 if (head_need) 567 skb_orphan(skb); 568 569 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) 570 return -ENOMEM; 571 572 skb->truesize += head_need; 573 } 574 575 if (encaps_data) { 576 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 577 nh_pos += encaps_len; 578 h_pos += encaps_len; 579 } 580 581 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 582 583 nh_pos += hdrlen; 584 h_pos += hdrlen; 585 586 /* Update skb pointers to various headers since this modified frame 587 * is going to go through Linux networking code that may potentially 588 * need things like pointer to IP header. */ 589 skb_set_mac_header(skb, 0); 590 skb_set_network_header(skb, nh_pos); 591 skb_set_transport_header(skb, h_pos); 592 593 return 0; 594 } 595 EXPORT_SYMBOL(ieee80211_data_from_8023); 596 597 598 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list, 599 const u8 *addr, enum nl80211_iftype iftype, 600 const unsigned int extra_headroom, 601 bool has_80211_header) 602 { 603 struct sk_buff *frame = NULL; 604 u16 ethertype; 605 u8 *payload; 606 const struct ethhdr *eth; 607 int remaining, err; 608 u8 dst[ETH_ALEN], src[ETH_ALEN]; 609 610 if (has_80211_header) { 611 err = ieee80211_data_to_8023(skb, addr, iftype); 612 if (err) 613 goto out; 614 615 /* skip the wrapping header */ 616 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); 617 if (!eth) 618 goto out; 619 } else { 620 eth = (struct ethhdr *) skb->data; 621 } 622 623 while (skb != frame) { 624 u8 padding; 625 __be16 len = eth->h_proto; 626 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); 627 628 remaining = skb->len; 629 memcpy(dst, eth->h_dest, ETH_ALEN); 630 memcpy(src, eth->h_source, ETH_ALEN); 631 632 padding = (4 - subframe_len) & 0x3; 633 /* the last MSDU has no padding */ 634 if (subframe_len > remaining) 635 goto purge; 636 637 skb_pull(skb, sizeof(struct ethhdr)); 638 /* reuse skb for the last subframe */ 639 if (remaining <= subframe_len + padding) 640 frame = skb; 641 else { 642 unsigned int hlen = ALIGN(extra_headroom, 4); 643 /* 644 * Allocate and reserve two bytes more for payload 645 * alignment since sizeof(struct ethhdr) is 14. 646 */ 647 frame = dev_alloc_skb(hlen + subframe_len + 2); 648 if (!frame) 649 goto purge; 650 651 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2); 652 memcpy(skb_put(frame, ntohs(len)), skb->data, 653 ntohs(len)); 654 655 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) + 656 padding); 657 if (!eth) { 658 dev_kfree_skb(frame); 659 goto purge; 660 } 661 } 662 663 skb_reset_network_header(frame); 664 frame->dev = skb->dev; 665 frame->priority = skb->priority; 666 667 payload = frame->data; 668 ethertype = (payload[6] << 8) | payload[7]; 669 670 if (likely((ether_addr_equal(payload, rfc1042_header) && 671 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || 672 ether_addr_equal(payload, bridge_tunnel_header))) { 673 /* remove RFC1042 or Bridge-Tunnel 674 * encapsulation and replace EtherType */ 675 skb_pull(frame, 6); 676 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); 677 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); 678 } else { 679 memcpy(skb_push(frame, sizeof(__be16)), &len, 680 sizeof(__be16)); 681 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); 682 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); 683 } 684 __skb_queue_tail(list, frame); 685 } 686 687 return; 688 689 purge: 690 __skb_queue_purge(list); 691 out: 692 dev_kfree_skb(skb); 693 } 694 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s); 695 696 /* Given a data frame determine the 802.1p/1d tag to use. */ 697 unsigned int cfg80211_classify8021d(struct sk_buff *skb, 698 struct cfg80211_qos_map *qos_map) 699 { 700 unsigned int dscp; 701 unsigned char vlan_priority; 702 703 /* skb->priority values from 256->263 are magic values to 704 * directly indicate a specific 802.1d priority. This is used 705 * to allow 802.1d priority to be passed directly in from VLAN 706 * tags, etc. 707 */ 708 if (skb->priority >= 256 && skb->priority <= 263) 709 return skb->priority - 256; 710 711 if (vlan_tx_tag_present(skb)) { 712 vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK) 713 >> VLAN_PRIO_SHIFT; 714 if (vlan_priority > 0) 715 return vlan_priority; 716 } 717 718 switch (skb->protocol) { 719 case htons(ETH_P_IP): 720 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc; 721 break; 722 case htons(ETH_P_IPV6): 723 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc; 724 break; 725 case htons(ETH_P_MPLS_UC): 726 case htons(ETH_P_MPLS_MC): { 727 struct mpls_label mpls_tmp, *mpls; 728 729 mpls = skb_header_pointer(skb, sizeof(struct ethhdr), 730 sizeof(*mpls), &mpls_tmp); 731 if (!mpls) 732 return 0; 733 734 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK) 735 >> MPLS_LS_TC_SHIFT; 736 } 737 case htons(ETH_P_80221): 738 /* 802.21 is always network control traffic */ 739 return 7; 740 default: 741 return 0; 742 } 743 744 if (qos_map) { 745 unsigned int i, tmp_dscp = dscp >> 2; 746 747 for (i = 0; i < qos_map->num_des; i++) { 748 if (tmp_dscp == qos_map->dscp_exception[i].dscp) 749 return qos_map->dscp_exception[i].up; 750 } 751 752 for (i = 0; i < 8; i++) { 753 if (tmp_dscp >= qos_map->up[i].low && 754 tmp_dscp <= qos_map->up[i].high) 755 return i; 756 } 757 } 758 759 return dscp >> 5; 760 } 761 EXPORT_SYMBOL(cfg80211_classify8021d); 762 763 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie) 764 { 765 const struct cfg80211_bss_ies *ies; 766 767 ies = rcu_dereference(bss->ies); 768 if (!ies) 769 return NULL; 770 771 return cfg80211_find_ie(ie, ies->data, ies->len); 772 } 773 EXPORT_SYMBOL(ieee80211_bss_get_ie); 774 775 void cfg80211_upload_connect_keys(struct wireless_dev *wdev) 776 { 777 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 778 struct net_device *dev = wdev->netdev; 779 int i; 780 781 if (!wdev->connect_keys) 782 return; 783 784 for (i = 0; i < 6; i++) { 785 if (!wdev->connect_keys->params[i].cipher) 786 continue; 787 if (rdev_add_key(rdev, dev, i, false, NULL, 788 &wdev->connect_keys->params[i])) { 789 netdev_err(dev, "failed to set key %d\n", i); 790 continue; 791 } 792 if (wdev->connect_keys->def == i) 793 if (rdev_set_default_key(rdev, dev, i, true, true)) { 794 netdev_err(dev, "failed to set defkey %d\n", i); 795 continue; 796 } 797 if (wdev->connect_keys->defmgmt == i) 798 if (rdev_set_default_mgmt_key(rdev, dev, i)) 799 netdev_err(dev, "failed to set mgtdef %d\n", i); 800 } 801 802 kzfree(wdev->connect_keys); 803 wdev->connect_keys = NULL; 804 } 805 806 void cfg80211_process_wdev_events(struct wireless_dev *wdev) 807 { 808 struct cfg80211_event *ev; 809 unsigned long flags; 810 const u8 *bssid = NULL; 811 812 spin_lock_irqsave(&wdev->event_lock, flags); 813 while (!list_empty(&wdev->event_list)) { 814 ev = list_first_entry(&wdev->event_list, 815 struct cfg80211_event, list); 816 list_del(&ev->list); 817 spin_unlock_irqrestore(&wdev->event_lock, flags); 818 819 wdev_lock(wdev); 820 switch (ev->type) { 821 case EVENT_CONNECT_RESULT: 822 if (!is_zero_ether_addr(ev->cr.bssid)) 823 bssid = ev->cr.bssid; 824 __cfg80211_connect_result( 825 wdev->netdev, bssid, 826 ev->cr.req_ie, ev->cr.req_ie_len, 827 ev->cr.resp_ie, ev->cr.resp_ie_len, 828 ev->cr.status, 829 ev->cr.status == WLAN_STATUS_SUCCESS, 830 NULL); 831 break; 832 case EVENT_ROAMED: 833 __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie, 834 ev->rm.req_ie_len, ev->rm.resp_ie, 835 ev->rm.resp_ie_len); 836 break; 837 case EVENT_DISCONNECTED: 838 __cfg80211_disconnected(wdev->netdev, 839 ev->dc.ie, ev->dc.ie_len, 840 ev->dc.reason, true); 841 break; 842 case EVENT_IBSS_JOINED: 843 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid, 844 ev->ij.channel); 845 break; 846 case EVENT_STOPPED: 847 __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev); 848 break; 849 } 850 wdev_unlock(wdev); 851 852 kfree(ev); 853 854 spin_lock_irqsave(&wdev->event_lock, flags); 855 } 856 spin_unlock_irqrestore(&wdev->event_lock, flags); 857 } 858 859 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev) 860 { 861 struct wireless_dev *wdev; 862 863 ASSERT_RTNL(); 864 865 list_for_each_entry(wdev, &rdev->wdev_list, list) 866 cfg80211_process_wdev_events(wdev); 867 } 868 869 int cfg80211_change_iface(struct cfg80211_registered_device *rdev, 870 struct net_device *dev, enum nl80211_iftype ntype, 871 u32 *flags, struct vif_params *params) 872 { 873 int err; 874 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype; 875 876 ASSERT_RTNL(); 877 878 /* don't support changing VLANs, you just re-create them */ 879 if (otype == NL80211_IFTYPE_AP_VLAN) 880 return -EOPNOTSUPP; 881 882 /* cannot change into P2P device type */ 883 if (ntype == NL80211_IFTYPE_P2P_DEVICE) 884 return -EOPNOTSUPP; 885 886 if (!rdev->ops->change_virtual_intf || 887 !(rdev->wiphy.interface_modes & (1 << ntype))) 888 return -EOPNOTSUPP; 889 890 /* if it's part of a bridge, reject changing type to station/ibss */ 891 if ((dev->priv_flags & IFF_BRIDGE_PORT) && 892 (ntype == NL80211_IFTYPE_ADHOC || 893 ntype == NL80211_IFTYPE_STATION || 894 ntype == NL80211_IFTYPE_P2P_CLIENT)) 895 return -EBUSY; 896 897 if (ntype != otype && netif_running(dev)) { 898 dev->ieee80211_ptr->use_4addr = false; 899 dev->ieee80211_ptr->mesh_id_up_len = 0; 900 wdev_lock(dev->ieee80211_ptr); 901 rdev_set_qos_map(rdev, dev, NULL); 902 wdev_unlock(dev->ieee80211_ptr); 903 904 switch (otype) { 905 case NL80211_IFTYPE_AP: 906 cfg80211_stop_ap(rdev, dev, true); 907 break; 908 case NL80211_IFTYPE_ADHOC: 909 cfg80211_leave_ibss(rdev, dev, false); 910 break; 911 case NL80211_IFTYPE_STATION: 912 case NL80211_IFTYPE_P2P_CLIENT: 913 wdev_lock(dev->ieee80211_ptr); 914 cfg80211_disconnect(rdev, dev, 915 WLAN_REASON_DEAUTH_LEAVING, true); 916 wdev_unlock(dev->ieee80211_ptr); 917 break; 918 case NL80211_IFTYPE_MESH_POINT: 919 /* mesh should be handled? */ 920 break; 921 default: 922 break; 923 } 924 925 cfg80211_process_rdev_events(rdev); 926 } 927 928 err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params); 929 930 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype); 931 932 if (!err && params && params->use_4addr != -1) 933 dev->ieee80211_ptr->use_4addr = params->use_4addr; 934 935 if (!err) { 936 dev->priv_flags &= ~IFF_DONT_BRIDGE; 937 switch (ntype) { 938 case NL80211_IFTYPE_STATION: 939 if (dev->ieee80211_ptr->use_4addr) 940 break; 941 /* fall through */ 942 case NL80211_IFTYPE_OCB: 943 case NL80211_IFTYPE_P2P_CLIENT: 944 case NL80211_IFTYPE_ADHOC: 945 dev->priv_flags |= IFF_DONT_BRIDGE; 946 break; 947 case NL80211_IFTYPE_P2P_GO: 948 case NL80211_IFTYPE_AP: 949 case NL80211_IFTYPE_AP_VLAN: 950 case NL80211_IFTYPE_WDS: 951 case NL80211_IFTYPE_MESH_POINT: 952 /* bridging OK */ 953 break; 954 case NL80211_IFTYPE_MONITOR: 955 /* monitor can't bridge anyway */ 956 break; 957 case NL80211_IFTYPE_UNSPECIFIED: 958 case NUM_NL80211_IFTYPES: 959 /* not happening */ 960 break; 961 case NL80211_IFTYPE_P2P_DEVICE: 962 WARN_ON(1); 963 break; 964 } 965 } 966 967 if (!err && ntype != otype && netif_running(dev)) { 968 cfg80211_update_iface_num(rdev, ntype, 1); 969 cfg80211_update_iface_num(rdev, otype, -1); 970 } 971 972 return err; 973 } 974 975 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate) 976 { 977 static const u32 __mcs2bitrate[] = { 978 /* control PHY */ 979 [0] = 275, 980 /* SC PHY */ 981 [1] = 3850, 982 [2] = 7700, 983 [3] = 9625, 984 [4] = 11550, 985 [5] = 12512, /* 1251.25 mbps */ 986 [6] = 15400, 987 [7] = 19250, 988 [8] = 23100, 989 [9] = 25025, 990 [10] = 30800, 991 [11] = 38500, 992 [12] = 46200, 993 /* OFDM PHY */ 994 [13] = 6930, 995 [14] = 8662, /* 866.25 mbps */ 996 [15] = 13860, 997 [16] = 17325, 998 [17] = 20790, 999 [18] = 27720, 1000 [19] = 34650, 1001 [20] = 41580, 1002 [21] = 45045, 1003 [22] = 51975, 1004 [23] = 62370, 1005 [24] = 67568, /* 6756.75 mbps */ 1006 /* LP-SC PHY */ 1007 [25] = 6260, 1008 [26] = 8340, 1009 [27] = 11120, 1010 [28] = 12510, 1011 [29] = 16680, 1012 [30] = 22240, 1013 [31] = 25030, 1014 }; 1015 1016 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate))) 1017 return 0; 1018 1019 return __mcs2bitrate[rate->mcs]; 1020 } 1021 1022 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate) 1023 { 1024 static const u32 base[4][10] = { 1025 { 6500000, 1026 13000000, 1027 19500000, 1028 26000000, 1029 39000000, 1030 52000000, 1031 58500000, 1032 65000000, 1033 78000000, 1034 0, 1035 }, 1036 { 13500000, 1037 27000000, 1038 40500000, 1039 54000000, 1040 81000000, 1041 108000000, 1042 121500000, 1043 135000000, 1044 162000000, 1045 180000000, 1046 }, 1047 { 29300000, 1048 58500000, 1049 87800000, 1050 117000000, 1051 175500000, 1052 234000000, 1053 263300000, 1054 292500000, 1055 351000000, 1056 390000000, 1057 }, 1058 { 58500000, 1059 117000000, 1060 175500000, 1061 234000000, 1062 351000000, 1063 468000000, 1064 526500000, 1065 585000000, 1066 702000000, 1067 780000000, 1068 }, 1069 }; 1070 u32 bitrate; 1071 int idx; 1072 1073 if (WARN_ON_ONCE(rate->mcs > 9)) 1074 return 0; 1075 1076 idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH | 1077 RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 : 1078 rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 : 1079 rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0; 1080 1081 bitrate = base[idx][rate->mcs]; 1082 bitrate *= rate->nss; 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 1091 u32 cfg80211_calculate_bitrate(struct rate_info *rate) 1092 { 1093 int modulation, streams, bitrate; 1094 1095 if (!(rate->flags & RATE_INFO_FLAGS_MCS) && 1096 !(rate->flags & RATE_INFO_FLAGS_VHT_MCS)) 1097 return rate->legacy; 1098 if (rate->flags & RATE_INFO_FLAGS_60G) 1099 return cfg80211_calculate_bitrate_60g(rate); 1100 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS) 1101 return cfg80211_calculate_bitrate_vht(rate); 1102 1103 /* the formula below does only work for MCS values smaller than 32 */ 1104 if (WARN_ON_ONCE(rate->mcs >= 32)) 1105 return 0; 1106 1107 modulation = rate->mcs & 7; 1108 streams = (rate->mcs >> 3) + 1; 1109 1110 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ? 1111 13500000 : 6500000; 1112 1113 if (modulation < 4) 1114 bitrate *= (modulation + 1); 1115 else if (modulation == 4) 1116 bitrate *= (modulation + 2); 1117 else 1118 bitrate *= (modulation + 3); 1119 1120 bitrate *= streams; 1121 1122 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI) 1123 bitrate = (bitrate / 9) * 10; 1124 1125 /* do NOT round down here */ 1126 return (bitrate + 50000) / 100000; 1127 } 1128 EXPORT_SYMBOL(cfg80211_calculate_bitrate); 1129 1130 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len, 1131 enum ieee80211_p2p_attr_id attr, 1132 u8 *buf, unsigned int bufsize) 1133 { 1134 u8 *out = buf; 1135 u16 attr_remaining = 0; 1136 bool desired_attr = false; 1137 u16 desired_len = 0; 1138 1139 while (len > 0) { 1140 unsigned int iedatalen; 1141 unsigned int copy; 1142 const u8 *iedata; 1143 1144 if (len < 2) 1145 return -EILSEQ; 1146 iedatalen = ies[1]; 1147 if (iedatalen + 2 > len) 1148 return -EILSEQ; 1149 1150 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC) 1151 goto cont; 1152 1153 if (iedatalen < 4) 1154 goto cont; 1155 1156 iedata = ies + 2; 1157 1158 /* check WFA OUI, P2P subtype */ 1159 if (iedata[0] != 0x50 || iedata[1] != 0x6f || 1160 iedata[2] != 0x9a || iedata[3] != 0x09) 1161 goto cont; 1162 1163 iedatalen -= 4; 1164 iedata += 4; 1165 1166 /* check attribute continuation into this IE */ 1167 copy = min_t(unsigned int, attr_remaining, iedatalen); 1168 if (copy && desired_attr) { 1169 desired_len += copy; 1170 if (out) { 1171 memcpy(out, iedata, min(bufsize, copy)); 1172 out += min(bufsize, copy); 1173 bufsize -= min(bufsize, copy); 1174 } 1175 1176 1177 if (copy == attr_remaining) 1178 return desired_len; 1179 } 1180 1181 attr_remaining -= copy; 1182 if (attr_remaining) 1183 goto cont; 1184 1185 iedatalen -= copy; 1186 iedata += copy; 1187 1188 while (iedatalen > 0) { 1189 u16 attr_len; 1190 1191 /* P2P attribute ID & size must fit */ 1192 if (iedatalen < 3) 1193 return -EILSEQ; 1194 desired_attr = iedata[0] == attr; 1195 attr_len = get_unaligned_le16(iedata + 1); 1196 iedatalen -= 3; 1197 iedata += 3; 1198 1199 copy = min_t(unsigned int, attr_len, iedatalen); 1200 1201 if (desired_attr) { 1202 desired_len += copy; 1203 if (out) { 1204 memcpy(out, iedata, min(bufsize, copy)); 1205 out += min(bufsize, copy); 1206 bufsize -= min(bufsize, copy); 1207 } 1208 1209 if (copy == attr_len) 1210 return desired_len; 1211 } 1212 1213 iedata += copy; 1214 iedatalen -= copy; 1215 attr_remaining = attr_len - copy; 1216 } 1217 1218 cont: 1219 len -= ies[1] + 2; 1220 ies += ies[1] + 2; 1221 } 1222 1223 if (attr_remaining && desired_attr) 1224 return -EILSEQ; 1225 1226 return -ENOENT; 1227 } 1228 EXPORT_SYMBOL(cfg80211_get_p2p_attr); 1229 1230 bool ieee80211_operating_class_to_band(u8 operating_class, 1231 enum ieee80211_band *band) 1232 { 1233 switch (operating_class) { 1234 case 112: 1235 case 115 ... 127: 1236 *band = IEEE80211_BAND_5GHZ; 1237 return true; 1238 case 81: 1239 case 82: 1240 case 83: 1241 case 84: 1242 *band = IEEE80211_BAND_2GHZ; 1243 return true; 1244 case 180: 1245 *band = IEEE80211_BAND_60GHZ; 1246 return true; 1247 } 1248 1249 return false; 1250 } 1251 EXPORT_SYMBOL(ieee80211_operating_class_to_band); 1252 1253 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev, 1254 u32 beacon_int) 1255 { 1256 struct wireless_dev *wdev; 1257 int res = 0; 1258 1259 if (!beacon_int) 1260 return -EINVAL; 1261 1262 list_for_each_entry(wdev, &rdev->wdev_list, list) { 1263 if (!wdev->beacon_interval) 1264 continue; 1265 if (wdev->beacon_interval != beacon_int) { 1266 res = -EINVAL; 1267 break; 1268 } 1269 } 1270 1271 return res; 1272 } 1273 1274 int cfg80211_iter_combinations(struct wiphy *wiphy, 1275 const int num_different_channels, 1276 const u8 radar_detect, 1277 const int iftype_num[NUM_NL80211_IFTYPES], 1278 void (*iter)(const struct ieee80211_iface_combination *c, 1279 void *data), 1280 void *data) 1281 { 1282 const struct ieee80211_regdomain *regdom; 1283 enum nl80211_dfs_regions region = 0; 1284 int i, j, iftype; 1285 int num_interfaces = 0; 1286 u32 used_iftypes = 0; 1287 1288 if (radar_detect) { 1289 rcu_read_lock(); 1290 regdom = rcu_dereference(cfg80211_regdomain); 1291 if (regdom) 1292 region = regdom->dfs_region; 1293 rcu_read_unlock(); 1294 } 1295 1296 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) { 1297 num_interfaces += iftype_num[iftype]; 1298 if (iftype_num[iftype] > 0 && 1299 !(wiphy->software_iftypes & BIT(iftype))) 1300 used_iftypes |= BIT(iftype); 1301 } 1302 1303 for (i = 0; i < wiphy->n_iface_combinations; i++) { 1304 const struct ieee80211_iface_combination *c; 1305 struct ieee80211_iface_limit *limits; 1306 u32 all_iftypes = 0; 1307 1308 c = &wiphy->iface_combinations[i]; 1309 1310 if (num_interfaces > c->max_interfaces) 1311 continue; 1312 if (num_different_channels > c->num_different_channels) 1313 continue; 1314 1315 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits, 1316 GFP_KERNEL); 1317 if (!limits) 1318 return -ENOMEM; 1319 1320 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) { 1321 if (wiphy->software_iftypes & BIT(iftype)) 1322 continue; 1323 for (j = 0; j < c->n_limits; j++) { 1324 all_iftypes |= limits[j].types; 1325 if (!(limits[j].types & BIT(iftype))) 1326 continue; 1327 if (limits[j].max < iftype_num[iftype]) 1328 goto cont; 1329 limits[j].max -= iftype_num[iftype]; 1330 } 1331 } 1332 1333 if (radar_detect != (c->radar_detect_widths & radar_detect)) 1334 goto cont; 1335 1336 if (radar_detect && c->radar_detect_regions && 1337 !(c->radar_detect_regions & BIT(region))) 1338 goto cont; 1339 1340 /* Finally check that all iftypes that we're currently 1341 * using are actually part of this combination. If they 1342 * aren't then we can't use this combination and have 1343 * to continue to the next. 1344 */ 1345 if ((all_iftypes & used_iftypes) != used_iftypes) 1346 goto cont; 1347 1348 /* This combination covered all interface types and 1349 * supported the requested numbers, so we're good. 1350 */ 1351 1352 (*iter)(c, data); 1353 cont: 1354 kfree(limits); 1355 } 1356 1357 return 0; 1358 } 1359 EXPORT_SYMBOL(cfg80211_iter_combinations); 1360 1361 static void 1362 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c, 1363 void *data) 1364 { 1365 int *num = data; 1366 (*num)++; 1367 } 1368 1369 int cfg80211_check_combinations(struct wiphy *wiphy, 1370 const int num_different_channels, 1371 const u8 radar_detect, 1372 const int iftype_num[NUM_NL80211_IFTYPES]) 1373 { 1374 int err, num = 0; 1375 1376 err = cfg80211_iter_combinations(wiphy, num_different_channels, 1377 radar_detect, iftype_num, 1378 cfg80211_iter_sum_ifcombs, &num); 1379 if (err) 1380 return err; 1381 if (num == 0) 1382 return -EBUSY; 1383 1384 return 0; 1385 } 1386 EXPORT_SYMBOL(cfg80211_check_combinations); 1387 1388 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev, 1389 struct wireless_dev *wdev, 1390 enum nl80211_iftype iftype, 1391 struct ieee80211_channel *chan, 1392 enum cfg80211_chan_mode chanmode, 1393 u8 radar_detect) 1394 { 1395 struct wireless_dev *wdev_iter; 1396 int num[NUM_NL80211_IFTYPES]; 1397 struct ieee80211_channel 1398 *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS]; 1399 struct ieee80211_channel *ch; 1400 enum cfg80211_chan_mode chmode; 1401 int num_different_channels = 0; 1402 int total = 1; 1403 int i; 1404 1405 ASSERT_RTNL(); 1406 1407 if (WARN_ON(hweight32(radar_detect) > 1)) 1408 return -EINVAL; 1409 1410 if (WARN_ON(iftype >= NUM_NL80211_IFTYPES)) 1411 return -EINVAL; 1412 1413 /* Always allow software iftypes */ 1414 if (rdev->wiphy.software_iftypes & BIT(iftype)) { 1415 if (radar_detect) 1416 return -EINVAL; 1417 return 0; 1418 } 1419 1420 memset(num, 0, sizeof(num)); 1421 memset(used_channels, 0, sizeof(used_channels)); 1422 1423 num[iftype] = 1; 1424 1425 /* TODO: We'll probably not need this anymore, since this 1426 * should only be called with CHAN_MODE_UNDEFINED. There are 1427 * still a couple of pending calls where other chanmodes are 1428 * used, but we should get rid of them. 1429 */ 1430 switch (chanmode) { 1431 case CHAN_MODE_UNDEFINED: 1432 break; 1433 case CHAN_MODE_SHARED: 1434 WARN_ON(!chan); 1435 used_channels[0] = chan; 1436 num_different_channels++; 1437 break; 1438 case CHAN_MODE_EXCLUSIVE: 1439 num_different_channels++; 1440 break; 1441 } 1442 1443 list_for_each_entry(wdev_iter, &rdev->wdev_list, list) { 1444 if (wdev_iter == wdev) 1445 continue; 1446 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) { 1447 if (!wdev_iter->p2p_started) 1448 continue; 1449 } else if (wdev_iter->netdev) { 1450 if (!netif_running(wdev_iter->netdev)) 1451 continue; 1452 } else { 1453 WARN_ON(1); 1454 } 1455 1456 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype)) 1457 continue; 1458 1459 /* 1460 * We may be holding the "wdev" mutex, but now need to lock 1461 * wdev_iter. This is OK because once we get here wdev_iter 1462 * is not wdev (tested above), but we need to use the nested 1463 * locking for lockdep. 1464 */ 1465 mutex_lock_nested(&wdev_iter->mtx, 1); 1466 __acquire(wdev_iter->mtx); 1467 cfg80211_get_chan_state(wdev_iter, &ch, &chmode, &radar_detect); 1468 wdev_unlock(wdev_iter); 1469 1470 switch (chmode) { 1471 case CHAN_MODE_UNDEFINED: 1472 break; 1473 case CHAN_MODE_SHARED: 1474 for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++) 1475 if (!used_channels[i] || used_channels[i] == ch) 1476 break; 1477 1478 if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS) 1479 return -EBUSY; 1480 1481 if (used_channels[i] == NULL) { 1482 used_channels[i] = ch; 1483 num_different_channels++; 1484 } 1485 break; 1486 case CHAN_MODE_EXCLUSIVE: 1487 num_different_channels++; 1488 break; 1489 } 1490 1491 num[wdev_iter->iftype]++; 1492 total++; 1493 } 1494 1495 if (total == 1 && !radar_detect) 1496 return 0; 1497 1498 return cfg80211_check_combinations(&rdev->wiphy, num_different_channels, 1499 radar_detect, num); 1500 } 1501 1502 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband, 1503 const u8 *rates, unsigned int n_rates, 1504 u32 *mask) 1505 { 1506 int i, j; 1507 1508 if (!sband) 1509 return -EINVAL; 1510 1511 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES) 1512 return -EINVAL; 1513 1514 *mask = 0; 1515 1516 for (i = 0; i < n_rates; i++) { 1517 int rate = (rates[i] & 0x7f) * 5; 1518 bool found = false; 1519 1520 for (j = 0; j < sband->n_bitrates; j++) { 1521 if (sband->bitrates[j].bitrate == rate) { 1522 found = true; 1523 *mask |= BIT(j); 1524 break; 1525 } 1526 } 1527 if (!found) 1528 return -EINVAL; 1529 } 1530 1531 /* 1532 * mask must have at least one bit set here since we 1533 * didn't accept a 0-length rates array nor allowed 1534 * entries in the array that didn't exist 1535 */ 1536 1537 return 0; 1538 } 1539 1540 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy) 1541 { 1542 enum ieee80211_band band; 1543 unsigned int n_channels = 0; 1544 1545 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 1546 if (wiphy->bands[band]) 1547 n_channels += wiphy->bands[band]->n_channels; 1548 1549 return n_channels; 1550 } 1551 EXPORT_SYMBOL(ieee80211_get_num_supported_channels); 1552 1553 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr, 1554 struct station_info *sinfo) 1555 { 1556 struct cfg80211_registered_device *rdev; 1557 struct wireless_dev *wdev; 1558 1559 wdev = dev->ieee80211_ptr; 1560 if (!wdev) 1561 return -EOPNOTSUPP; 1562 1563 rdev = wiphy_to_rdev(wdev->wiphy); 1564 if (!rdev->ops->get_station) 1565 return -EOPNOTSUPP; 1566 1567 return rdev_get_station(rdev, dev, mac_addr, sinfo); 1568 } 1569 EXPORT_SYMBOL(cfg80211_get_station); 1570 1571 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ 1572 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ 1573 const unsigned char rfc1042_header[] __aligned(2) = 1574 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; 1575 EXPORT_SYMBOL(rfc1042_header); 1576 1577 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ 1578 const unsigned char bridge_tunnel_header[] __aligned(2) = 1579 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; 1580 EXPORT_SYMBOL(bridge_tunnel_header); 1581