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_mgmt(fc)) { 312 if (ieee80211_has_order(fc)) 313 hdrlen += IEEE80211_HT_CTL_LEN; 314 goto out; 315 } 316 317 if (ieee80211_is_ctl(fc)) { 318 /* 319 * ACK and CTS are 10 bytes, all others 16. To see how 320 * to get this condition consider 321 * subtype mask: 0b0000000011110000 (0x00F0) 322 * ACK subtype: 0b0000000011010000 (0x00D0) 323 * CTS subtype: 0b0000000011000000 (0x00C0) 324 * bits that matter: ^^^ (0x00E0) 325 * value of those: 0b0000000011000000 (0x00C0) 326 */ 327 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0)) 328 hdrlen = 10; 329 else 330 hdrlen = 16; 331 } 332 out: 333 return hdrlen; 334 } 335 EXPORT_SYMBOL(ieee80211_hdrlen); 336 337 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) 338 { 339 const struct ieee80211_hdr *hdr = 340 (const struct ieee80211_hdr *)skb->data; 341 unsigned int hdrlen; 342 343 if (unlikely(skb->len < 10)) 344 return 0; 345 hdrlen = ieee80211_hdrlen(hdr->frame_control); 346 if (unlikely(hdrlen > skb->len)) 347 return 0; 348 return hdrlen; 349 } 350 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); 351 352 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) 353 { 354 int ae = meshhdr->flags & MESH_FLAGS_AE; 355 /* 802.11-2012, 8.2.4.7.3 */ 356 switch (ae) { 357 default: 358 case 0: 359 return 6; 360 case MESH_FLAGS_AE_A4: 361 return 12; 362 case MESH_FLAGS_AE_A5_A6: 363 return 18; 364 } 365 } 366 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen); 367 368 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, 369 enum nl80211_iftype iftype) 370 { 371 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 372 u16 hdrlen, ethertype; 373 u8 *payload; 374 u8 dst[ETH_ALEN]; 375 u8 src[ETH_ALEN] __aligned(2); 376 377 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 378 return -1; 379 380 hdrlen = ieee80211_hdrlen(hdr->frame_control); 381 382 /* convert IEEE 802.11 header + possible LLC headers into Ethernet 383 * header 384 * IEEE 802.11 address fields: 385 * ToDS FromDS Addr1 Addr2 Addr3 Addr4 386 * 0 0 DA SA BSSID n/a 387 * 0 1 DA BSSID SA n/a 388 * 1 0 BSSID SA DA n/a 389 * 1 1 RA TA DA SA 390 */ 391 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN); 392 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN); 393 394 switch (hdr->frame_control & 395 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { 396 case cpu_to_le16(IEEE80211_FCTL_TODS): 397 if (unlikely(iftype != NL80211_IFTYPE_AP && 398 iftype != NL80211_IFTYPE_AP_VLAN && 399 iftype != NL80211_IFTYPE_P2P_GO)) 400 return -1; 401 break; 402 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): 403 if (unlikely(iftype != NL80211_IFTYPE_WDS && 404 iftype != NL80211_IFTYPE_MESH_POINT && 405 iftype != NL80211_IFTYPE_AP_VLAN && 406 iftype != NL80211_IFTYPE_STATION)) 407 return -1; 408 if (iftype == NL80211_IFTYPE_MESH_POINT) { 409 struct ieee80211s_hdr *meshdr = 410 (struct ieee80211s_hdr *) (skb->data + hdrlen); 411 /* make sure meshdr->flags is on the linear part */ 412 if (!pskb_may_pull(skb, hdrlen + 1)) 413 return -1; 414 if (meshdr->flags & MESH_FLAGS_AE_A4) 415 return -1; 416 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) { 417 skb_copy_bits(skb, hdrlen + 418 offsetof(struct ieee80211s_hdr, eaddr1), 419 dst, ETH_ALEN); 420 skb_copy_bits(skb, hdrlen + 421 offsetof(struct ieee80211s_hdr, eaddr2), 422 src, ETH_ALEN); 423 } 424 hdrlen += ieee80211_get_mesh_hdrlen(meshdr); 425 } 426 break; 427 case cpu_to_le16(IEEE80211_FCTL_FROMDS): 428 if ((iftype != NL80211_IFTYPE_STATION && 429 iftype != NL80211_IFTYPE_P2P_CLIENT && 430 iftype != NL80211_IFTYPE_MESH_POINT) || 431 (is_multicast_ether_addr(dst) && 432 ether_addr_equal(src, addr))) 433 return -1; 434 if (iftype == NL80211_IFTYPE_MESH_POINT) { 435 struct ieee80211s_hdr *meshdr = 436 (struct ieee80211s_hdr *) (skb->data + hdrlen); 437 /* make sure meshdr->flags is on the linear part */ 438 if (!pskb_may_pull(skb, hdrlen + 1)) 439 return -1; 440 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) 441 return -1; 442 if (meshdr->flags & MESH_FLAGS_AE_A4) 443 skb_copy_bits(skb, hdrlen + 444 offsetof(struct ieee80211s_hdr, eaddr1), 445 src, ETH_ALEN); 446 hdrlen += ieee80211_get_mesh_hdrlen(meshdr); 447 } 448 break; 449 case cpu_to_le16(0): 450 if (iftype != NL80211_IFTYPE_ADHOC && 451 iftype != NL80211_IFTYPE_STATION && 452 iftype != NL80211_IFTYPE_OCB) 453 return -1; 454 break; 455 } 456 457 if (!pskb_may_pull(skb, hdrlen + 8)) 458 return -1; 459 460 payload = skb->data + hdrlen; 461 ethertype = (payload[6] << 8) | payload[7]; 462 463 if (likely((ether_addr_equal(payload, rfc1042_header) && 464 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || 465 ether_addr_equal(payload, bridge_tunnel_header))) { 466 /* remove RFC1042 or Bridge-Tunnel encapsulation and 467 * replace EtherType */ 468 skb_pull(skb, hdrlen + 6); 469 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN); 470 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN); 471 } else { 472 struct ethhdr *ehdr; 473 __be16 len; 474 475 skb_pull(skb, hdrlen); 476 len = htons(skb->len); 477 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); 478 memcpy(ehdr->h_dest, dst, ETH_ALEN); 479 memcpy(ehdr->h_source, src, ETH_ALEN); 480 ehdr->h_proto = len; 481 } 482 return 0; 483 } 484 EXPORT_SYMBOL(ieee80211_data_to_8023); 485 486 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr, 487 enum nl80211_iftype iftype, 488 const u8 *bssid, bool qos) 489 { 490 struct ieee80211_hdr hdr; 491 u16 hdrlen, ethertype; 492 __le16 fc; 493 const u8 *encaps_data; 494 int encaps_len, skip_header_bytes; 495 int nh_pos, h_pos; 496 int head_need; 497 498 if (unlikely(skb->len < ETH_HLEN)) 499 return -EINVAL; 500 501 nh_pos = skb_network_header(skb) - skb->data; 502 h_pos = skb_transport_header(skb) - skb->data; 503 504 /* convert Ethernet header to proper 802.11 header (based on 505 * operation mode) */ 506 ethertype = (skb->data[12] << 8) | skb->data[13]; 507 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 508 509 switch (iftype) { 510 case NL80211_IFTYPE_AP: 511 case NL80211_IFTYPE_AP_VLAN: 512 case NL80211_IFTYPE_P2P_GO: 513 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 514 /* DA BSSID SA */ 515 memcpy(hdr.addr1, skb->data, ETH_ALEN); 516 memcpy(hdr.addr2, addr, ETH_ALEN); 517 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 518 hdrlen = 24; 519 break; 520 case NL80211_IFTYPE_STATION: 521 case NL80211_IFTYPE_P2P_CLIENT: 522 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 523 /* BSSID SA DA */ 524 memcpy(hdr.addr1, bssid, ETH_ALEN); 525 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 526 memcpy(hdr.addr3, skb->data, ETH_ALEN); 527 hdrlen = 24; 528 break; 529 case NL80211_IFTYPE_OCB: 530 case NL80211_IFTYPE_ADHOC: 531 /* DA SA BSSID */ 532 memcpy(hdr.addr1, skb->data, ETH_ALEN); 533 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 534 memcpy(hdr.addr3, bssid, ETH_ALEN); 535 hdrlen = 24; 536 break; 537 default: 538 return -EOPNOTSUPP; 539 } 540 541 if (qos) { 542 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 543 hdrlen += 2; 544 } 545 546 hdr.frame_control = fc; 547 hdr.duration_id = 0; 548 hdr.seq_ctrl = 0; 549 550 skip_header_bytes = ETH_HLEN; 551 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 552 encaps_data = bridge_tunnel_header; 553 encaps_len = sizeof(bridge_tunnel_header); 554 skip_header_bytes -= 2; 555 } else if (ethertype >= ETH_P_802_3_MIN) { 556 encaps_data = rfc1042_header; 557 encaps_len = sizeof(rfc1042_header); 558 skip_header_bytes -= 2; 559 } else { 560 encaps_data = NULL; 561 encaps_len = 0; 562 } 563 564 skb_pull(skb, skip_header_bytes); 565 nh_pos -= skip_header_bytes; 566 h_pos -= skip_header_bytes; 567 568 head_need = hdrlen + encaps_len - skb_headroom(skb); 569 570 if (head_need > 0 || skb_cloned(skb)) { 571 head_need = max(head_need, 0); 572 if (head_need) 573 skb_orphan(skb); 574 575 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) 576 return -ENOMEM; 577 578 skb->truesize += head_need; 579 } 580 581 if (encaps_data) { 582 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 583 nh_pos += encaps_len; 584 h_pos += encaps_len; 585 } 586 587 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 588 589 nh_pos += hdrlen; 590 h_pos += hdrlen; 591 592 /* Update skb pointers to various headers since this modified frame 593 * is going to go through Linux networking code that may potentially 594 * need things like pointer to IP header. */ 595 skb_set_mac_header(skb, 0); 596 skb_set_network_header(skb, nh_pos); 597 skb_set_transport_header(skb, h_pos); 598 599 return 0; 600 } 601 EXPORT_SYMBOL(ieee80211_data_from_8023); 602 603 604 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list, 605 const u8 *addr, enum nl80211_iftype iftype, 606 const unsigned int extra_headroom, 607 bool has_80211_header) 608 { 609 struct sk_buff *frame = NULL; 610 u16 ethertype; 611 u8 *payload; 612 const struct ethhdr *eth; 613 int remaining, err; 614 u8 dst[ETH_ALEN], src[ETH_ALEN]; 615 616 if (has_80211_header) { 617 err = ieee80211_data_to_8023(skb, addr, iftype); 618 if (err) 619 goto out; 620 621 /* skip the wrapping header */ 622 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); 623 if (!eth) 624 goto out; 625 } else { 626 eth = (struct ethhdr *) skb->data; 627 } 628 629 while (skb != frame) { 630 u8 padding; 631 __be16 len = eth->h_proto; 632 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); 633 634 remaining = skb->len; 635 memcpy(dst, eth->h_dest, ETH_ALEN); 636 memcpy(src, eth->h_source, ETH_ALEN); 637 638 padding = (4 - subframe_len) & 0x3; 639 /* the last MSDU has no padding */ 640 if (subframe_len > remaining) 641 goto purge; 642 643 skb_pull(skb, sizeof(struct ethhdr)); 644 /* reuse skb for the last subframe */ 645 if (remaining <= subframe_len + padding) 646 frame = skb; 647 else { 648 unsigned int hlen = ALIGN(extra_headroom, 4); 649 /* 650 * Allocate and reserve two bytes more for payload 651 * alignment since sizeof(struct ethhdr) is 14. 652 */ 653 frame = dev_alloc_skb(hlen + subframe_len + 2); 654 if (!frame) 655 goto purge; 656 657 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2); 658 memcpy(skb_put(frame, ntohs(len)), skb->data, 659 ntohs(len)); 660 661 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) + 662 padding); 663 if (!eth) { 664 dev_kfree_skb(frame); 665 goto purge; 666 } 667 } 668 669 skb_reset_network_header(frame); 670 frame->dev = skb->dev; 671 frame->priority = skb->priority; 672 673 payload = frame->data; 674 ethertype = (payload[6] << 8) | payload[7]; 675 676 if (likely((ether_addr_equal(payload, rfc1042_header) && 677 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || 678 ether_addr_equal(payload, bridge_tunnel_header))) { 679 /* remove RFC1042 or Bridge-Tunnel 680 * encapsulation and replace EtherType */ 681 skb_pull(frame, 6); 682 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); 683 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); 684 } else { 685 memcpy(skb_push(frame, sizeof(__be16)), &len, 686 sizeof(__be16)); 687 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); 688 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); 689 } 690 __skb_queue_tail(list, frame); 691 } 692 693 return; 694 695 purge: 696 __skb_queue_purge(list); 697 out: 698 dev_kfree_skb(skb); 699 } 700 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s); 701 702 /* Given a data frame determine the 802.1p/1d tag to use. */ 703 unsigned int cfg80211_classify8021d(struct sk_buff *skb, 704 struct cfg80211_qos_map *qos_map) 705 { 706 unsigned int dscp; 707 unsigned char vlan_priority; 708 709 /* skb->priority values from 256->263 are magic values to 710 * directly indicate a specific 802.1d priority. This is used 711 * to allow 802.1d priority to be passed directly in from VLAN 712 * tags, etc. 713 */ 714 if (skb->priority >= 256 && skb->priority <= 263) 715 return skb->priority - 256; 716 717 if (vlan_tx_tag_present(skb)) { 718 vlan_priority = (vlan_tx_tag_get(skb) & VLAN_PRIO_MASK) 719 >> VLAN_PRIO_SHIFT; 720 if (vlan_priority > 0) 721 return vlan_priority; 722 } 723 724 switch (skb->protocol) { 725 case htons(ETH_P_IP): 726 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc; 727 break; 728 case htons(ETH_P_IPV6): 729 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc; 730 break; 731 case htons(ETH_P_MPLS_UC): 732 case htons(ETH_P_MPLS_MC): { 733 struct mpls_label mpls_tmp, *mpls; 734 735 mpls = skb_header_pointer(skb, sizeof(struct ethhdr), 736 sizeof(*mpls), &mpls_tmp); 737 if (!mpls) 738 return 0; 739 740 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK) 741 >> MPLS_LS_TC_SHIFT; 742 } 743 case htons(ETH_P_80221): 744 /* 802.21 is always network control traffic */ 745 return 7; 746 default: 747 return 0; 748 } 749 750 if (qos_map) { 751 unsigned int i, tmp_dscp = dscp >> 2; 752 753 for (i = 0; i < qos_map->num_des; i++) { 754 if (tmp_dscp == qos_map->dscp_exception[i].dscp) 755 return qos_map->dscp_exception[i].up; 756 } 757 758 for (i = 0; i < 8; i++) { 759 if (tmp_dscp >= qos_map->up[i].low && 760 tmp_dscp <= qos_map->up[i].high) 761 return i; 762 } 763 } 764 765 return dscp >> 5; 766 } 767 EXPORT_SYMBOL(cfg80211_classify8021d); 768 769 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie) 770 { 771 const struct cfg80211_bss_ies *ies; 772 773 ies = rcu_dereference(bss->ies); 774 if (!ies) 775 return NULL; 776 777 return cfg80211_find_ie(ie, ies->data, ies->len); 778 } 779 EXPORT_SYMBOL(ieee80211_bss_get_ie); 780 781 void cfg80211_upload_connect_keys(struct wireless_dev *wdev) 782 { 783 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 784 struct net_device *dev = wdev->netdev; 785 int i; 786 787 if (!wdev->connect_keys) 788 return; 789 790 for (i = 0; i < 6; i++) { 791 if (!wdev->connect_keys->params[i].cipher) 792 continue; 793 if (rdev_add_key(rdev, dev, i, false, NULL, 794 &wdev->connect_keys->params[i])) { 795 netdev_err(dev, "failed to set key %d\n", i); 796 continue; 797 } 798 if (wdev->connect_keys->def == i) 799 if (rdev_set_default_key(rdev, dev, i, true, true)) { 800 netdev_err(dev, "failed to set defkey %d\n", i); 801 continue; 802 } 803 if (wdev->connect_keys->defmgmt == i) 804 if (rdev_set_default_mgmt_key(rdev, dev, i)) 805 netdev_err(dev, "failed to set mgtdef %d\n", i); 806 } 807 808 kzfree(wdev->connect_keys); 809 wdev->connect_keys = NULL; 810 } 811 812 void cfg80211_process_wdev_events(struct wireless_dev *wdev) 813 { 814 struct cfg80211_event *ev; 815 unsigned long flags; 816 const u8 *bssid = NULL; 817 818 spin_lock_irqsave(&wdev->event_lock, flags); 819 while (!list_empty(&wdev->event_list)) { 820 ev = list_first_entry(&wdev->event_list, 821 struct cfg80211_event, list); 822 list_del(&ev->list); 823 spin_unlock_irqrestore(&wdev->event_lock, flags); 824 825 wdev_lock(wdev); 826 switch (ev->type) { 827 case EVENT_CONNECT_RESULT: 828 if (!is_zero_ether_addr(ev->cr.bssid)) 829 bssid = ev->cr.bssid; 830 __cfg80211_connect_result( 831 wdev->netdev, bssid, 832 ev->cr.req_ie, ev->cr.req_ie_len, 833 ev->cr.resp_ie, ev->cr.resp_ie_len, 834 ev->cr.status, 835 ev->cr.status == WLAN_STATUS_SUCCESS, 836 NULL); 837 break; 838 case EVENT_ROAMED: 839 __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie, 840 ev->rm.req_ie_len, ev->rm.resp_ie, 841 ev->rm.resp_ie_len); 842 break; 843 case EVENT_DISCONNECTED: 844 __cfg80211_disconnected(wdev->netdev, 845 ev->dc.ie, ev->dc.ie_len, 846 ev->dc.reason, true); 847 break; 848 case EVENT_IBSS_JOINED: 849 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid, 850 ev->ij.channel); 851 break; 852 case EVENT_STOPPED: 853 __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev); 854 break; 855 } 856 wdev_unlock(wdev); 857 858 kfree(ev); 859 860 spin_lock_irqsave(&wdev->event_lock, flags); 861 } 862 spin_unlock_irqrestore(&wdev->event_lock, flags); 863 } 864 865 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev) 866 { 867 struct wireless_dev *wdev; 868 869 ASSERT_RTNL(); 870 871 list_for_each_entry(wdev, &rdev->wdev_list, list) 872 cfg80211_process_wdev_events(wdev); 873 } 874 875 int cfg80211_change_iface(struct cfg80211_registered_device *rdev, 876 struct net_device *dev, enum nl80211_iftype ntype, 877 u32 *flags, struct vif_params *params) 878 { 879 int err; 880 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype; 881 882 ASSERT_RTNL(); 883 884 /* don't support changing VLANs, you just re-create them */ 885 if (otype == NL80211_IFTYPE_AP_VLAN) 886 return -EOPNOTSUPP; 887 888 /* cannot change into P2P device type */ 889 if (ntype == NL80211_IFTYPE_P2P_DEVICE) 890 return -EOPNOTSUPP; 891 892 if (!rdev->ops->change_virtual_intf || 893 !(rdev->wiphy.interface_modes & (1 << ntype))) 894 return -EOPNOTSUPP; 895 896 /* if it's part of a bridge, reject changing type to station/ibss */ 897 if ((dev->priv_flags & IFF_BRIDGE_PORT) && 898 (ntype == NL80211_IFTYPE_ADHOC || 899 ntype == NL80211_IFTYPE_STATION || 900 ntype == NL80211_IFTYPE_P2P_CLIENT)) 901 return -EBUSY; 902 903 if (ntype != otype && netif_running(dev)) { 904 dev->ieee80211_ptr->use_4addr = false; 905 dev->ieee80211_ptr->mesh_id_up_len = 0; 906 wdev_lock(dev->ieee80211_ptr); 907 rdev_set_qos_map(rdev, dev, NULL); 908 wdev_unlock(dev->ieee80211_ptr); 909 910 switch (otype) { 911 case NL80211_IFTYPE_AP: 912 cfg80211_stop_ap(rdev, dev, true); 913 break; 914 case NL80211_IFTYPE_ADHOC: 915 cfg80211_leave_ibss(rdev, dev, false); 916 break; 917 case NL80211_IFTYPE_STATION: 918 case NL80211_IFTYPE_P2P_CLIENT: 919 wdev_lock(dev->ieee80211_ptr); 920 cfg80211_disconnect(rdev, dev, 921 WLAN_REASON_DEAUTH_LEAVING, true); 922 wdev_unlock(dev->ieee80211_ptr); 923 break; 924 case NL80211_IFTYPE_MESH_POINT: 925 /* mesh should be handled? */ 926 break; 927 default: 928 break; 929 } 930 931 cfg80211_process_rdev_events(rdev); 932 } 933 934 err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params); 935 936 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype); 937 938 if (!err && params && params->use_4addr != -1) 939 dev->ieee80211_ptr->use_4addr = params->use_4addr; 940 941 if (!err) { 942 dev->priv_flags &= ~IFF_DONT_BRIDGE; 943 switch (ntype) { 944 case NL80211_IFTYPE_STATION: 945 if (dev->ieee80211_ptr->use_4addr) 946 break; 947 /* fall through */ 948 case NL80211_IFTYPE_OCB: 949 case NL80211_IFTYPE_P2P_CLIENT: 950 case NL80211_IFTYPE_ADHOC: 951 dev->priv_flags |= IFF_DONT_BRIDGE; 952 break; 953 case NL80211_IFTYPE_P2P_GO: 954 case NL80211_IFTYPE_AP: 955 case NL80211_IFTYPE_AP_VLAN: 956 case NL80211_IFTYPE_WDS: 957 case NL80211_IFTYPE_MESH_POINT: 958 /* bridging OK */ 959 break; 960 case NL80211_IFTYPE_MONITOR: 961 /* monitor can't bridge anyway */ 962 break; 963 case NL80211_IFTYPE_UNSPECIFIED: 964 case NUM_NL80211_IFTYPES: 965 /* not happening */ 966 break; 967 case NL80211_IFTYPE_P2P_DEVICE: 968 WARN_ON(1); 969 break; 970 } 971 } 972 973 if (!err && ntype != otype && netif_running(dev)) { 974 cfg80211_update_iface_num(rdev, ntype, 1); 975 cfg80211_update_iface_num(rdev, otype, -1); 976 } 977 978 return err; 979 } 980 981 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate) 982 { 983 static const u32 __mcs2bitrate[] = { 984 /* control PHY */ 985 [0] = 275, 986 /* SC PHY */ 987 [1] = 3850, 988 [2] = 7700, 989 [3] = 9625, 990 [4] = 11550, 991 [5] = 12512, /* 1251.25 mbps */ 992 [6] = 15400, 993 [7] = 19250, 994 [8] = 23100, 995 [9] = 25025, 996 [10] = 30800, 997 [11] = 38500, 998 [12] = 46200, 999 /* OFDM PHY */ 1000 [13] = 6930, 1001 [14] = 8662, /* 866.25 mbps */ 1002 [15] = 13860, 1003 [16] = 17325, 1004 [17] = 20790, 1005 [18] = 27720, 1006 [19] = 34650, 1007 [20] = 41580, 1008 [21] = 45045, 1009 [22] = 51975, 1010 [23] = 62370, 1011 [24] = 67568, /* 6756.75 mbps */ 1012 /* LP-SC PHY */ 1013 [25] = 6260, 1014 [26] = 8340, 1015 [27] = 11120, 1016 [28] = 12510, 1017 [29] = 16680, 1018 [30] = 22240, 1019 [31] = 25030, 1020 }; 1021 1022 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate))) 1023 return 0; 1024 1025 return __mcs2bitrate[rate->mcs]; 1026 } 1027 1028 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate) 1029 { 1030 static const u32 base[4][10] = { 1031 { 6500000, 1032 13000000, 1033 19500000, 1034 26000000, 1035 39000000, 1036 52000000, 1037 58500000, 1038 65000000, 1039 78000000, 1040 0, 1041 }, 1042 { 13500000, 1043 27000000, 1044 40500000, 1045 54000000, 1046 81000000, 1047 108000000, 1048 121500000, 1049 135000000, 1050 162000000, 1051 180000000, 1052 }, 1053 { 29300000, 1054 58500000, 1055 87800000, 1056 117000000, 1057 175500000, 1058 234000000, 1059 263300000, 1060 292500000, 1061 351000000, 1062 390000000, 1063 }, 1064 { 58500000, 1065 117000000, 1066 175500000, 1067 234000000, 1068 351000000, 1069 468000000, 1070 526500000, 1071 585000000, 1072 702000000, 1073 780000000, 1074 }, 1075 }; 1076 u32 bitrate; 1077 int idx; 1078 1079 if (WARN_ON_ONCE(rate->mcs > 9)) 1080 return 0; 1081 1082 idx = rate->flags & (RATE_INFO_FLAGS_160_MHZ_WIDTH | 1083 RATE_INFO_FLAGS_80P80_MHZ_WIDTH) ? 3 : 1084 rate->flags & RATE_INFO_FLAGS_80_MHZ_WIDTH ? 2 : 1085 rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH ? 1 : 0; 1086 1087 bitrate = base[idx][rate->mcs]; 1088 bitrate *= rate->nss; 1089 1090 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI) 1091 bitrate = (bitrate / 9) * 10; 1092 1093 /* do NOT round down here */ 1094 return (bitrate + 50000) / 100000; 1095 } 1096 1097 u32 cfg80211_calculate_bitrate(struct rate_info *rate) 1098 { 1099 int modulation, streams, bitrate; 1100 1101 if (!(rate->flags & RATE_INFO_FLAGS_MCS) && 1102 !(rate->flags & RATE_INFO_FLAGS_VHT_MCS)) 1103 return rate->legacy; 1104 if (rate->flags & RATE_INFO_FLAGS_60G) 1105 return cfg80211_calculate_bitrate_60g(rate); 1106 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS) 1107 return cfg80211_calculate_bitrate_vht(rate); 1108 1109 /* the formula below does only work for MCS values smaller than 32 */ 1110 if (WARN_ON_ONCE(rate->mcs >= 32)) 1111 return 0; 1112 1113 modulation = rate->mcs & 7; 1114 streams = (rate->mcs >> 3) + 1; 1115 1116 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ? 1117 13500000 : 6500000; 1118 1119 if (modulation < 4) 1120 bitrate *= (modulation + 1); 1121 else if (modulation == 4) 1122 bitrate *= (modulation + 2); 1123 else 1124 bitrate *= (modulation + 3); 1125 1126 bitrate *= streams; 1127 1128 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI) 1129 bitrate = (bitrate / 9) * 10; 1130 1131 /* do NOT round down here */ 1132 return (bitrate + 50000) / 100000; 1133 } 1134 EXPORT_SYMBOL(cfg80211_calculate_bitrate); 1135 1136 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len, 1137 enum ieee80211_p2p_attr_id attr, 1138 u8 *buf, unsigned int bufsize) 1139 { 1140 u8 *out = buf; 1141 u16 attr_remaining = 0; 1142 bool desired_attr = false; 1143 u16 desired_len = 0; 1144 1145 while (len > 0) { 1146 unsigned int iedatalen; 1147 unsigned int copy; 1148 const u8 *iedata; 1149 1150 if (len < 2) 1151 return -EILSEQ; 1152 iedatalen = ies[1]; 1153 if (iedatalen + 2 > len) 1154 return -EILSEQ; 1155 1156 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC) 1157 goto cont; 1158 1159 if (iedatalen < 4) 1160 goto cont; 1161 1162 iedata = ies + 2; 1163 1164 /* check WFA OUI, P2P subtype */ 1165 if (iedata[0] != 0x50 || iedata[1] != 0x6f || 1166 iedata[2] != 0x9a || iedata[3] != 0x09) 1167 goto cont; 1168 1169 iedatalen -= 4; 1170 iedata += 4; 1171 1172 /* check attribute continuation into this IE */ 1173 copy = min_t(unsigned int, attr_remaining, iedatalen); 1174 if (copy && desired_attr) { 1175 desired_len += copy; 1176 if (out) { 1177 memcpy(out, iedata, min(bufsize, copy)); 1178 out += min(bufsize, copy); 1179 bufsize -= min(bufsize, copy); 1180 } 1181 1182 1183 if (copy == attr_remaining) 1184 return desired_len; 1185 } 1186 1187 attr_remaining -= copy; 1188 if (attr_remaining) 1189 goto cont; 1190 1191 iedatalen -= copy; 1192 iedata += copy; 1193 1194 while (iedatalen > 0) { 1195 u16 attr_len; 1196 1197 /* P2P attribute ID & size must fit */ 1198 if (iedatalen < 3) 1199 return -EILSEQ; 1200 desired_attr = iedata[0] == attr; 1201 attr_len = get_unaligned_le16(iedata + 1); 1202 iedatalen -= 3; 1203 iedata += 3; 1204 1205 copy = min_t(unsigned int, attr_len, iedatalen); 1206 1207 if (desired_attr) { 1208 desired_len += copy; 1209 if (out) { 1210 memcpy(out, iedata, min(bufsize, copy)); 1211 out += min(bufsize, copy); 1212 bufsize -= min(bufsize, copy); 1213 } 1214 1215 if (copy == attr_len) 1216 return desired_len; 1217 } 1218 1219 iedata += copy; 1220 iedatalen -= copy; 1221 attr_remaining = attr_len - copy; 1222 } 1223 1224 cont: 1225 len -= ies[1] + 2; 1226 ies += ies[1] + 2; 1227 } 1228 1229 if (attr_remaining && desired_attr) 1230 return -EILSEQ; 1231 1232 return -ENOENT; 1233 } 1234 EXPORT_SYMBOL(cfg80211_get_p2p_attr); 1235 1236 bool ieee80211_operating_class_to_band(u8 operating_class, 1237 enum ieee80211_band *band) 1238 { 1239 switch (operating_class) { 1240 case 112: 1241 case 115 ... 127: 1242 *band = IEEE80211_BAND_5GHZ; 1243 return true; 1244 case 81: 1245 case 82: 1246 case 83: 1247 case 84: 1248 *band = IEEE80211_BAND_2GHZ; 1249 return true; 1250 case 180: 1251 *band = IEEE80211_BAND_60GHZ; 1252 return true; 1253 } 1254 1255 return false; 1256 } 1257 EXPORT_SYMBOL(ieee80211_operating_class_to_band); 1258 1259 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev, 1260 u32 beacon_int) 1261 { 1262 struct wireless_dev *wdev; 1263 int res = 0; 1264 1265 if (!beacon_int) 1266 return -EINVAL; 1267 1268 list_for_each_entry(wdev, &rdev->wdev_list, list) { 1269 if (!wdev->beacon_interval) 1270 continue; 1271 if (wdev->beacon_interval != beacon_int) { 1272 res = -EINVAL; 1273 break; 1274 } 1275 } 1276 1277 return res; 1278 } 1279 1280 int cfg80211_iter_combinations(struct wiphy *wiphy, 1281 const int num_different_channels, 1282 const u8 radar_detect, 1283 const int iftype_num[NUM_NL80211_IFTYPES], 1284 void (*iter)(const struct ieee80211_iface_combination *c, 1285 void *data), 1286 void *data) 1287 { 1288 const struct ieee80211_regdomain *regdom; 1289 enum nl80211_dfs_regions region = 0; 1290 int i, j, iftype; 1291 int num_interfaces = 0; 1292 u32 used_iftypes = 0; 1293 1294 if (radar_detect) { 1295 rcu_read_lock(); 1296 regdom = rcu_dereference(cfg80211_regdomain); 1297 if (regdom) 1298 region = regdom->dfs_region; 1299 rcu_read_unlock(); 1300 } 1301 1302 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) { 1303 num_interfaces += iftype_num[iftype]; 1304 if (iftype_num[iftype] > 0 && 1305 !(wiphy->software_iftypes & BIT(iftype))) 1306 used_iftypes |= BIT(iftype); 1307 } 1308 1309 for (i = 0; i < wiphy->n_iface_combinations; i++) { 1310 const struct ieee80211_iface_combination *c; 1311 struct ieee80211_iface_limit *limits; 1312 u32 all_iftypes = 0; 1313 1314 c = &wiphy->iface_combinations[i]; 1315 1316 if (num_interfaces > c->max_interfaces) 1317 continue; 1318 if (num_different_channels > c->num_different_channels) 1319 continue; 1320 1321 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits, 1322 GFP_KERNEL); 1323 if (!limits) 1324 return -ENOMEM; 1325 1326 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) { 1327 if (wiphy->software_iftypes & BIT(iftype)) 1328 continue; 1329 for (j = 0; j < c->n_limits; j++) { 1330 all_iftypes |= limits[j].types; 1331 if (!(limits[j].types & BIT(iftype))) 1332 continue; 1333 if (limits[j].max < iftype_num[iftype]) 1334 goto cont; 1335 limits[j].max -= iftype_num[iftype]; 1336 } 1337 } 1338 1339 if (radar_detect != (c->radar_detect_widths & radar_detect)) 1340 goto cont; 1341 1342 if (radar_detect && c->radar_detect_regions && 1343 !(c->radar_detect_regions & BIT(region))) 1344 goto cont; 1345 1346 /* Finally check that all iftypes that we're currently 1347 * using are actually part of this combination. If they 1348 * aren't then we can't use this combination and have 1349 * to continue to the next. 1350 */ 1351 if ((all_iftypes & used_iftypes) != used_iftypes) 1352 goto cont; 1353 1354 /* This combination covered all interface types and 1355 * supported the requested numbers, so we're good. 1356 */ 1357 1358 (*iter)(c, data); 1359 cont: 1360 kfree(limits); 1361 } 1362 1363 return 0; 1364 } 1365 EXPORT_SYMBOL(cfg80211_iter_combinations); 1366 1367 static void 1368 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c, 1369 void *data) 1370 { 1371 int *num = data; 1372 (*num)++; 1373 } 1374 1375 int cfg80211_check_combinations(struct wiphy *wiphy, 1376 const int num_different_channels, 1377 const u8 radar_detect, 1378 const int iftype_num[NUM_NL80211_IFTYPES]) 1379 { 1380 int err, num = 0; 1381 1382 err = cfg80211_iter_combinations(wiphy, num_different_channels, 1383 radar_detect, iftype_num, 1384 cfg80211_iter_sum_ifcombs, &num); 1385 if (err) 1386 return err; 1387 if (num == 0) 1388 return -EBUSY; 1389 1390 return 0; 1391 } 1392 EXPORT_SYMBOL(cfg80211_check_combinations); 1393 1394 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev, 1395 struct wireless_dev *wdev, 1396 enum nl80211_iftype iftype, 1397 struct ieee80211_channel *chan, 1398 enum cfg80211_chan_mode chanmode, 1399 u8 radar_detect) 1400 { 1401 struct wireless_dev *wdev_iter; 1402 int num[NUM_NL80211_IFTYPES]; 1403 struct ieee80211_channel 1404 *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS]; 1405 struct ieee80211_channel *ch; 1406 enum cfg80211_chan_mode chmode; 1407 int num_different_channels = 0; 1408 int total = 1; 1409 int i; 1410 1411 ASSERT_RTNL(); 1412 1413 if (WARN_ON(hweight32(radar_detect) > 1)) 1414 return -EINVAL; 1415 1416 if (WARN_ON(iftype >= NUM_NL80211_IFTYPES)) 1417 return -EINVAL; 1418 1419 /* Always allow software iftypes */ 1420 if (rdev->wiphy.software_iftypes & BIT(iftype)) { 1421 if (radar_detect) 1422 return -EINVAL; 1423 return 0; 1424 } 1425 1426 memset(num, 0, sizeof(num)); 1427 memset(used_channels, 0, sizeof(used_channels)); 1428 1429 num[iftype] = 1; 1430 1431 /* TODO: We'll probably not need this anymore, since this 1432 * should only be called with CHAN_MODE_UNDEFINED. There are 1433 * still a couple of pending calls where other chanmodes are 1434 * used, but we should get rid of them. 1435 */ 1436 switch (chanmode) { 1437 case CHAN_MODE_UNDEFINED: 1438 break; 1439 case CHAN_MODE_SHARED: 1440 WARN_ON(!chan); 1441 used_channels[0] = chan; 1442 num_different_channels++; 1443 break; 1444 case CHAN_MODE_EXCLUSIVE: 1445 num_different_channels++; 1446 break; 1447 } 1448 1449 list_for_each_entry(wdev_iter, &rdev->wdev_list, list) { 1450 if (wdev_iter == wdev) 1451 continue; 1452 if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) { 1453 if (!wdev_iter->p2p_started) 1454 continue; 1455 } else if (wdev_iter->netdev) { 1456 if (!netif_running(wdev_iter->netdev)) 1457 continue; 1458 } else { 1459 WARN_ON(1); 1460 } 1461 1462 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype)) 1463 continue; 1464 1465 /* 1466 * We may be holding the "wdev" mutex, but now need to lock 1467 * wdev_iter. This is OK because once we get here wdev_iter 1468 * is not wdev (tested above), but we need to use the nested 1469 * locking for lockdep. 1470 */ 1471 mutex_lock_nested(&wdev_iter->mtx, 1); 1472 __acquire(wdev_iter->mtx); 1473 cfg80211_get_chan_state(wdev_iter, &ch, &chmode, &radar_detect); 1474 wdev_unlock(wdev_iter); 1475 1476 switch (chmode) { 1477 case CHAN_MODE_UNDEFINED: 1478 break; 1479 case CHAN_MODE_SHARED: 1480 for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++) 1481 if (!used_channels[i] || used_channels[i] == ch) 1482 break; 1483 1484 if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS) 1485 return -EBUSY; 1486 1487 if (used_channels[i] == NULL) { 1488 used_channels[i] = ch; 1489 num_different_channels++; 1490 } 1491 break; 1492 case CHAN_MODE_EXCLUSIVE: 1493 num_different_channels++; 1494 break; 1495 } 1496 1497 num[wdev_iter->iftype]++; 1498 total++; 1499 } 1500 1501 if (total == 1 && !radar_detect) 1502 return 0; 1503 1504 return cfg80211_check_combinations(&rdev->wiphy, num_different_channels, 1505 radar_detect, num); 1506 } 1507 1508 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband, 1509 const u8 *rates, unsigned int n_rates, 1510 u32 *mask) 1511 { 1512 int i, j; 1513 1514 if (!sband) 1515 return -EINVAL; 1516 1517 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES) 1518 return -EINVAL; 1519 1520 *mask = 0; 1521 1522 for (i = 0; i < n_rates; i++) { 1523 int rate = (rates[i] & 0x7f) * 5; 1524 bool found = false; 1525 1526 for (j = 0; j < sband->n_bitrates; j++) { 1527 if (sband->bitrates[j].bitrate == rate) { 1528 found = true; 1529 *mask |= BIT(j); 1530 break; 1531 } 1532 } 1533 if (!found) 1534 return -EINVAL; 1535 } 1536 1537 /* 1538 * mask must have at least one bit set here since we 1539 * didn't accept a 0-length rates array nor allowed 1540 * entries in the array that didn't exist 1541 */ 1542 1543 return 0; 1544 } 1545 1546 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy) 1547 { 1548 enum ieee80211_band band; 1549 unsigned int n_channels = 0; 1550 1551 for (band = 0; band < IEEE80211_NUM_BANDS; band++) 1552 if (wiphy->bands[band]) 1553 n_channels += wiphy->bands[band]->n_channels; 1554 1555 return n_channels; 1556 } 1557 EXPORT_SYMBOL(ieee80211_get_num_supported_channels); 1558 1559 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr, 1560 struct station_info *sinfo) 1561 { 1562 struct cfg80211_registered_device *rdev; 1563 struct wireless_dev *wdev; 1564 1565 wdev = dev->ieee80211_ptr; 1566 if (!wdev) 1567 return -EOPNOTSUPP; 1568 1569 rdev = wiphy_to_rdev(wdev->wiphy); 1570 if (!rdev->ops->get_station) 1571 return -EOPNOTSUPP; 1572 1573 return rdev_get_station(rdev, dev, mac_addr, sinfo); 1574 } 1575 EXPORT_SYMBOL(cfg80211_get_station); 1576 1577 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ 1578 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ 1579 const unsigned char rfc1042_header[] __aligned(2) = 1580 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; 1581 EXPORT_SYMBOL(rfc1042_header); 1582 1583 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ 1584 const unsigned char bridge_tunnel_header[] __aligned(2) = 1585 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; 1586 EXPORT_SYMBOL(bridge_tunnel_header); 1587