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 == NL80211_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 nl80211_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 NL80211_BAND_2GHZ: 76 if (chan == 14) 77 return 2484; 78 else if (chan < 14) 79 return 2407 + chan * 5; 80 break; 81 case NL80211_BAND_5GHZ: 82 if (chan >= 182 && chan <= 196) 83 return 4000 + chan * 5; 84 else 85 return 5000 + chan * 5; 86 break; 87 case NL80211_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 nl80211_band band; 120 struct ieee80211_supported_band *sband; 121 int i; 122 123 for (band = 0; band < NUM_NL80211_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 nl80211_band band) 141 { 142 int i, want; 143 144 switch (band) { 145 case NL80211_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 NL80211_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 NL80211_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 NUM_NL80211_BANDS: 194 WARN_ON(1); 195 break; 196 } 197 } 198 199 void ieee80211_set_bitrate_flags(struct wiphy *wiphy) 200 { 201 enum nl80211_band band; 202 203 for (band = 0; band < NUM_NL80211_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 switch (params->cipher) { 231 case WLAN_CIPHER_SUITE_TKIP: 232 case WLAN_CIPHER_SUITE_CCMP: 233 case WLAN_CIPHER_SUITE_CCMP_256: 234 case WLAN_CIPHER_SUITE_GCMP: 235 case WLAN_CIPHER_SUITE_GCMP_256: 236 /* Disallow pairwise keys with non-zero index unless it's WEP 237 * or a vendor specific cipher (because current deployments use 238 * pairwise WEP keys with non-zero indices and for vendor 239 * specific ciphers this should be validated in the driver or 240 * hardware level - but 802.11i clearly specifies to use zero) 241 */ 242 if (pairwise && key_idx) 243 return -EINVAL; 244 break; 245 case WLAN_CIPHER_SUITE_AES_CMAC: 246 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 247 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 248 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 249 /* Disallow BIP (group-only) cipher as pairwise cipher */ 250 if (pairwise) 251 return -EINVAL; 252 break; 253 default: 254 break; 255 } 256 257 switch (params->cipher) { 258 case WLAN_CIPHER_SUITE_WEP40: 259 if (params->key_len != WLAN_KEY_LEN_WEP40) 260 return -EINVAL; 261 break; 262 case WLAN_CIPHER_SUITE_TKIP: 263 if (params->key_len != WLAN_KEY_LEN_TKIP) 264 return -EINVAL; 265 break; 266 case WLAN_CIPHER_SUITE_CCMP: 267 if (params->key_len != WLAN_KEY_LEN_CCMP) 268 return -EINVAL; 269 break; 270 case WLAN_CIPHER_SUITE_CCMP_256: 271 if (params->key_len != WLAN_KEY_LEN_CCMP_256) 272 return -EINVAL; 273 break; 274 case WLAN_CIPHER_SUITE_GCMP: 275 if (params->key_len != WLAN_KEY_LEN_GCMP) 276 return -EINVAL; 277 break; 278 case WLAN_CIPHER_SUITE_GCMP_256: 279 if (params->key_len != WLAN_KEY_LEN_GCMP_256) 280 return -EINVAL; 281 break; 282 case WLAN_CIPHER_SUITE_WEP104: 283 if (params->key_len != WLAN_KEY_LEN_WEP104) 284 return -EINVAL; 285 break; 286 case WLAN_CIPHER_SUITE_AES_CMAC: 287 if (params->key_len != WLAN_KEY_LEN_AES_CMAC) 288 return -EINVAL; 289 break; 290 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 291 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256) 292 return -EINVAL; 293 break; 294 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 295 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128) 296 return -EINVAL; 297 break; 298 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 299 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256) 300 return -EINVAL; 301 break; 302 default: 303 /* 304 * We don't know anything about this algorithm, 305 * allow using it -- but the driver must check 306 * all parameters! We still check below whether 307 * or not the driver supports this algorithm, 308 * of course. 309 */ 310 break; 311 } 312 313 if (params->seq) { 314 switch (params->cipher) { 315 case WLAN_CIPHER_SUITE_WEP40: 316 case WLAN_CIPHER_SUITE_WEP104: 317 /* These ciphers do not use key sequence */ 318 return -EINVAL; 319 case WLAN_CIPHER_SUITE_TKIP: 320 case WLAN_CIPHER_SUITE_CCMP: 321 case WLAN_CIPHER_SUITE_CCMP_256: 322 case WLAN_CIPHER_SUITE_GCMP: 323 case WLAN_CIPHER_SUITE_GCMP_256: 324 case WLAN_CIPHER_SUITE_AES_CMAC: 325 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 326 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 327 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 328 if (params->seq_len != 6) 329 return -EINVAL; 330 break; 331 } 332 } 333 334 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher)) 335 return -EINVAL; 336 337 return 0; 338 } 339 340 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc) 341 { 342 unsigned int hdrlen = 24; 343 344 if (ieee80211_is_data(fc)) { 345 if (ieee80211_has_a4(fc)) 346 hdrlen = 30; 347 if (ieee80211_is_data_qos(fc)) { 348 hdrlen += IEEE80211_QOS_CTL_LEN; 349 if (ieee80211_has_order(fc)) 350 hdrlen += IEEE80211_HT_CTL_LEN; 351 } 352 goto out; 353 } 354 355 if (ieee80211_is_mgmt(fc)) { 356 if (ieee80211_has_order(fc)) 357 hdrlen += IEEE80211_HT_CTL_LEN; 358 goto out; 359 } 360 361 if (ieee80211_is_ctl(fc)) { 362 /* 363 * ACK and CTS are 10 bytes, all others 16. To see how 364 * to get this condition consider 365 * subtype mask: 0b0000000011110000 (0x00F0) 366 * ACK subtype: 0b0000000011010000 (0x00D0) 367 * CTS subtype: 0b0000000011000000 (0x00C0) 368 * bits that matter: ^^^ (0x00E0) 369 * value of those: 0b0000000011000000 (0x00C0) 370 */ 371 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0)) 372 hdrlen = 10; 373 else 374 hdrlen = 16; 375 } 376 out: 377 return hdrlen; 378 } 379 EXPORT_SYMBOL(ieee80211_hdrlen); 380 381 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb) 382 { 383 const struct ieee80211_hdr *hdr = 384 (const struct ieee80211_hdr *)skb->data; 385 unsigned int hdrlen; 386 387 if (unlikely(skb->len < 10)) 388 return 0; 389 hdrlen = ieee80211_hdrlen(hdr->frame_control); 390 if (unlikely(hdrlen > skb->len)) 391 return 0; 392 return hdrlen; 393 } 394 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb); 395 396 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags) 397 { 398 int ae = flags & MESH_FLAGS_AE; 399 /* 802.11-2012, 8.2.4.7.3 */ 400 switch (ae) { 401 default: 402 case 0: 403 return 6; 404 case MESH_FLAGS_AE_A4: 405 return 12; 406 case MESH_FLAGS_AE_A5_A6: 407 return 18; 408 } 409 } 410 411 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr) 412 { 413 return __ieee80211_get_mesh_hdrlen(meshhdr->flags); 414 } 415 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen); 416 417 static int __ieee80211_data_to_8023(struct sk_buff *skb, struct ethhdr *ehdr, 418 const u8 *addr, enum nl80211_iftype iftype) 419 { 420 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 421 struct { 422 u8 hdr[ETH_ALEN] __aligned(2); 423 __be16 proto; 424 } payload; 425 struct ethhdr tmp; 426 u16 hdrlen; 427 u8 mesh_flags = 0; 428 429 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 430 return -1; 431 432 hdrlen = ieee80211_hdrlen(hdr->frame_control); 433 if (skb->len < hdrlen + 8) 434 return -1; 435 436 /* convert IEEE 802.11 header + possible LLC headers into Ethernet 437 * header 438 * IEEE 802.11 address fields: 439 * ToDS FromDS Addr1 Addr2 Addr3 Addr4 440 * 0 0 DA SA BSSID n/a 441 * 0 1 DA BSSID SA n/a 442 * 1 0 BSSID SA DA n/a 443 * 1 1 RA TA DA SA 444 */ 445 memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN); 446 memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN); 447 448 if (iftype == NL80211_IFTYPE_MESH_POINT) 449 skb_copy_bits(skb, hdrlen, &mesh_flags, 1); 450 451 switch (hdr->frame_control & 452 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { 453 case cpu_to_le16(IEEE80211_FCTL_TODS): 454 if (unlikely(iftype != NL80211_IFTYPE_AP && 455 iftype != NL80211_IFTYPE_AP_VLAN && 456 iftype != NL80211_IFTYPE_P2P_GO)) 457 return -1; 458 break; 459 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS): 460 if (unlikely(iftype != NL80211_IFTYPE_WDS && 461 iftype != NL80211_IFTYPE_MESH_POINT && 462 iftype != NL80211_IFTYPE_AP_VLAN && 463 iftype != NL80211_IFTYPE_STATION)) 464 return -1; 465 if (iftype == NL80211_IFTYPE_MESH_POINT) { 466 if (mesh_flags & MESH_FLAGS_AE_A4) 467 return -1; 468 if (mesh_flags & MESH_FLAGS_AE_A5_A6) { 469 skb_copy_bits(skb, hdrlen + 470 offsetof(struct ieee80211s_hdr, eaddr1), 471 tmp.h_dest, 2 * ETH_ALEN); 472 } 473 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags); 474 } 475 break; 476 case cpu_to_le16(IEEE80211_FCTL_FROMDS): 477 if ((iftype != NL80211_IFTYPE_STATION && 478 iftype != NL80211_IFTYPE_P2P_CLIENT && 479 iftype != NL80211_IFTYPE_MESH_POINT) || 480 (is_multicast_ether_addr(tmp.h_dest) && 481 ether_addr_equal(tmp.h_source, addr))) 482 return -1; 483 if (iftype == NL80211_IFTYPE_MESH_POINT) { 484 if (mesh_flags & MESH_FLAGS_AE_A5_A6) 485 return -1; 486 if (mesh_flags & MESH_FLAGS_AE_A4) 487 skb_copy_bits(skb, hdrlen + 488 offsetof(struct ieee80211s_hdr, eaddr1), 489 tmp.h_source, ETH_ALEN); 490 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags); 491 } 492 break; 493 case cpu_to_le16(0): 494 if (iftype != NL80211_IFTYPE_ADHOC && 495 iftype != NL80211_IFTYPE_STATION && 496 iftype != NL80211_IFTYPE_OCB) 497 return -1; 498 break; 499 } 500 501 skb_copy_bits(skb, hdrlen, &payload, sizeof(payload)); 502 tmp.h_proto = payload.proto; 503 504 if (likely((ether_addr_equal(payload.hdr, rfc1042_header) && 505 tmp.h_proto != htons(ETH_P_AARP) && 506 tmp.h_proto != htons(ETH_P_IPX)) || 507 ether_addr_equal(payload.hdr, bridge_tunnel_header))) 508 /* remove RFC1042 or Bridge-Tunnel encapsulation and 509 * replace EtherType */ 510 hdrlen += ETH_ALEN + 2; 511 else 512 tmp.h_proto = htons(skb->len - hdrlen); 513 514 pskb_pull(skb, hdrlen); 515 516 if (!ehdr) 517 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr)); 518 memcpy(ehdr, &tmp, sizeof(tmp)); 519 520 return 0; 521 } 522 523 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr, 524 enum nl80211_iftype iftype) 525 { 526 return __ieee80211_data_to_8023(skb, NULL, addr, iftype); 527 } 528 EXPORT_SYMBOL(ieee80211_data_to_8023); 529 530 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr, 531 enum nl80211_iftype iftype, 532 const u8 *bssid, bool qos) 533 { 534 struct ieee80211_hdr hdr; 535 u16 hdrlen, ethertype; 536 __le16 fc; 537 const u8 *encaps_data; 538 int encaps_len, skip_header_bytes; 539 int nh_pos, h_pos; 540 int head_need; 541 542 if (unlikely(skb->len < ETH_HLEN)) 543 return -EINVAL; 544 545 nh_pos = skb_network_header(skb) - skb->data; 546 h_pos = skb_transport_header(skb) - skb->data; 547 548 /* convert Ethernet header to proper 802.11 header (based on 549 * operation mode) */ 550 ethertype = (skb->data[12] << 8) | skb->data[13]; 551 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 552 553 switch (iftype) { 554 case NL80211_IFTYPE_AP: 555 case NL80211_IFTYPE_AP_VLAN: 556 case NL80211_IFTYPE_P2P_GO: 557 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 558 /* DA BSSID SA */ 559 memcpy(hdr.addr1, skb->data, ETH_ALEN); 560 memcpy(hdr.addr2, addr, ETH_ALEN); 561 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 562 hdrlen = 24; 563 break; 564 case NL80211_IFTYPE_STATION: 565 case NL80211_IFTYPE_P2P_CLIENT: 566 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 567 /* BSSID SA DA */ 568 memcpy(hdr.addr1, bssid, ETH_ALEN); 569 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 570 memcpy(hdr.addr3, skb->data, ETH_ALEN); 571 hdrlen = 24; 572 break; 573 case NL80211_IFTYPE_OCB: 574 case NL80211_IFTYPE_ADHOC: 575 /* DA SA BSSID */ 576 memcpy(hdr.addr1, skb->data, ETH_ALEN); 577 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 578 memcpy(hdr.addr3, bssid, ETH_ALEN); 579 hdrlen = 24; 580 break; 581 default: 582 return -EOPNOTSUPP; 583 } 584 585 if (qos) { 586 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 587 hdrlen += 2; 588 } 589 590 hdr.frame_control = fc; 591 hdr.duration_id = 0; 592 hdr.seq_ctrl = 0; 593 594 skip_header_bytes = ETH_HLEN; 595 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 596 encaps_data = bridge_tunnel_header; 597 encaps_len = sizeof(bridge_tunnel_header); 598 skip_header_bytes -= 2; 599 } else if (ethertype >= ETH_P_802_3_MIN) { 600 encaps_data = rfc1042_header; 601 encaps_len = sizeof(rfc1042_header); 602 skip_header_bytes -= 2; 603 } else { 604 encaps_data = NULL; 605 encaps_len = 0; 606 } 607 608 skb_pull(skb, skip_header_bytes); 609 nh_pos -= skip_header_bytes; 610 h_pos -= skip_header_bytes; 611 612 head_need = hdrlen + encaps_len - skb_headroom(skb); 613 614 if (head_need > 0 || skb_cloned(skb)) { 615 head_need = max(head_need, 0); 616 if (head_need) 617 skb_orphan(skb); 618 619 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) 620 return -ENOMEM; 621 622 skb->truesize += head_need; 623 } 624 625 if (encaps_data) { 626 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 627 nh_pos += encaps_len; 628 h_pos += encaps_len; 629 } 630 631 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 632 633 nh_pos += hdrlen; 634 h_pos += hdrlen; 635 636 /* Update skb pointers to various headers since this modified frame 637 * is going to go through Linux networking code that may potentially 638 * need things like pointer to IP header. */ 639 skb_reset_mac_header(skb); 640 skb_set_network_header(skb, nh_pos); 641 skb_set_transport_header(skb, h_pos); 642 643 return 0; 644 } 645 EXPORT_SYMBOL(ieee80211_data_from_8023); 646 647 static void 648 __frame_add_frag(struct sk_buff *skb, struct page *page, 649 void *ptr, int len, int size) 650 { 651 struct skb_shared_info *sh = skb_shinfo(skb); 652 int page_offset; 653 654 page_ref_inc(page); 655 page_offset = ptr - page_address(page); 656 skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size); 657 } 658 659 static void 660 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame, 661 int offset, int len) 662 { 663 struct skb_shared_info *sh = skb_shinfo(skb); 664 const skb_frag_t *frag = &sh->frags[-1]; 665 struct page *frag_page; 666 void *frag_ptr; 667 int frag_len, frag_size; 668 int head_size = skb->len - skb->data_len; 669 int cur_len; 670 671 frag_page = virt_to_head_page(skb->head); 672 frag_ptr = skb->data; 673 frag_size = head_size; 674 675 while (offset >= frag_size) { 676 offset -= frag_size; 677 frag++; 678 frag_page = skb_frag_page(frag); 679 frag_ptr = skb_frag_address(frag); 680 frag_size = skb_frag_size(frag); 681 } 682 683 frag_ptr += offset; 684 frag_len = frag_size - offset; 685 686 cur_len = min(len, frag_len); 687 688 __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size); 689 len -= cur_len; 690 691 while (len > 0) { 692 frag++; 693 frag_len = skb_frag_size(frag); 694 cur_len = min(len, frag_len); 695 __frame_add_frag(frame, skb_frag_page(frag), 696 skb_frag_address(frag), cur_len, frag_len); 697 len -= cur_len; 698 } 699 } 700 701 static struct sk_buff * 702 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen, 703 int offset, int len, bool reuse_frag) 704 { 705 struct sk_buff *frame; 706 int cur_len = len; 707 708 if (skb->len - offset < len) 709 return NULL; 710 711 /* 712 * When reusing framents, copy some data to the head to simplify 713 * ethernet header handling and speed up protocol header processing 714 * in the stack later. 715 */ 716 if (reuse_frag) 717 cur_len = min_t(int, len, 32); 718 719 /* 720 * Allocate and reserve two bytes more for payload 721 * alignment since sizeof(struct ethhdr) is 14. 722 */ 723 frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len); 724 725 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2); 726 skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len); 727 728 len -= cur_len; 729 if (!len) 730 return frame; 731 732 offset += cur_len; 733 __ieee80211_amsdu_copy_frag(skb, frame, offset, len); 734 735 return frame; 736 } 737 738 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list, 739 const u8 *addr, enum nl80211_iftype iftype, 740 const unsigned int extra_headroom, 741 bool has_80211_header) 742 { 743 unsigned int hlen = ALIGN(extra_headroom, 4); 744 struct sk_buff *frame = NULL; 745 u16 ethertype; 746 u8 *payload; 747 int offset = 0, remaining, err; 748 struct ethhdr eth; 749 bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb); 750 bool reuse_skb = false; 751 bool last = false; 752 753 if (has_80211_header) { 754 err = __ieee80211_data_to_8023(skb, ð, addr, iftype); 755 if (err) 756 goto out; 757 } 758 759 while (!last) { 760 unsigned int subframe_len; 761 int len; 762 u8 padding; 763 764 skb_copy_bits(skb, offset, ð, sizeof(eth)); 765 len = ntohs(eth.h_proto); 766 subframe_len = sizeof(struct ethhdr) + len; 767 padding = (4 - subframe_len) & 0x3; 768 769 /* the last MSDU has no padding */ 770 remaining = skb->len - offset; 771 if (subframe_len > remaining) 772 goto purge; 773 774 offset += sizeof(struct ethhdr); 775 /* reuse skb for the last subframe */ 776 last = remaining <= subframe_len + padding; 777 if (!skb_is_nonlinear(skb) && !reuse_frag && last) { 778 skb_pull(skb, offset); 779 frame = skb; 780 reuse_skb = true; 781 } else { 782 frame = __ieee80211_amsdu_copy(skb, hlen, offset, len, 783 reuse_frag); 784 if (!frame) 785 goto purge; 786 787 offset += len + padding; 788 } 789 790 skb_reset_network_header(frame); 791 frame->dev = skb->dev; 792 frame->priority = skb->priority; 793 794 payload = frame->data; 795 ethertype = (payload[6] << 8) | payload[7]; 796 if (likely((ether_addr_equal(payload, rfc1042_header) && 797 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || 798 ether_addr_equal(payload, bridge_tunnel_header))) { 799 eth.h_proto = htons(ethertype); 800 skb_pull(frame, ETH_ALEN + 2); 801 } 802 803 memcpy(skb_push(frame, sizeof(eth)), ð, sizeof(eth)); 804 __skb_queue_tail(list, frame); 805 } 806 807 if (!reuse_skb) 808 dev_kfree_skb(skb); 809 810 return; 811 812 purge: 813 __skb_queue_purge(list); 814 out: 815 dev_kfree_skb(skb); 816 } 817 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s); 818 819 /* Given a data frame determine the 802.1p/1d tag to use. */ 820 unsigned int cfg80211_classify8021d(struct sk_buff *skb, 821 struct cfg80211_qos_map *qos_map) 822 { 823 unsigned int dscp; 824 unsigned char vlan_priority; 825 826 /* skb->priority values from 256->263 are magic values to 827 * directly indicate a specific 802.1d priority. This is used 828 * to allow 802.1d priority to be passed directly in from VLAN 829 * tags, etc. 830 */ 831 if (skb->priority >= 256 && skb->priority <= 263) 832 return skb->priority - 256; 833 834 if (skb_vlan_tag_present(skb)) { 835 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK) 836 >> VLAN_PRIO_SHIFT; 837 if (vlan_priority > 0) 838 return vlan_priority; 839 } 840 841 switch (skb->protocol) { 842 case htons(ETH_P_IP): 843 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc; 844 break; 845 case htons(ETH_P_IPV6): 846 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc; 847 break; 848 case htons(ETH_P_MPLS_UC): 849 case htons(ETH_P_MPLS_MC): { 850 struct mpls_label mpls_tmp, *mpls; 851 852 mpls = skb_header_pointer(skb, sizeof(struct ethhdr), 853 sizeof(*mpls), &mpls_tmp); 854 if (!mpls) 855 return 0; 856 857 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK) 858 >> MPLS_LS_TC_SHIFT; 859 } 860 case htons(ETH_P_80221): 861 /* 802.21 is always network control traffic */ 862 return 7; 863 default: 864 return 0; 865 } 866 867 if (qos_map) { 868 unsigned int i, tmp_dscp = dscp >> 2; 869 870 for (i = 0; i < qos_map->num_des; i++) { 871 if (tmp_dscp == qos_map->dscp_exception[i].dscp) 872 return qos_map->dscp_exception[i].up; 873 } 874 875 for (i = 0; i < 8; i++) { 876 if (tmp_dscp >= qos_map->up[i].low && 877 tmp_dscp <= qos_map->up[i].high) 878 return i; 879 } 880 } 881 882 return dscp >> 5; 883 } 884 EXPORT_SYMBOL(cfg80211_classify8021d); 885 886 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie) 887 { 888 const struct cfg80211_bss_ies *ies; 889 890 ies = rcu_dereference(bss->ies); 891 if (!ies) 892 return NULL; 893 894 return cfg80211_find_ie(ie, ies->data, ies->len); 895 } 896 EXPORT_SYMBOL(ieee80211_bss_get_ie); 897 898 void cfg80211_upload_connect_keys(struct wireless_dev *wdev) 899 { 900 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy); 901 struct net_device *dev = wdev->netdev; 902 int i; 903 904 if (!wdev->connect_keys) 905 return; 906 907 for (i = 0; i < 6; i++) { 908 if (!wdev->connect_keys->params[i].cipher) 909 continue; 910 if (rdev_add_key(rdev, dev, i, false, NULL, 911 &wdev->connect_keys->params[i])) { 912 netdev_err(dev, "failed to set key %d\n", i); 913 continue; 914 } 915 if (wdev->connect_keys->def == i) 916 if (rdev_set_default_key(rdev, dev, i, true, true)) { 917 netdev_err(dev, "failed to set defkey %d\n", i); 918 continue; 919 } 920 if (wdev->connect_keys->defmgmt == i) 921 if (rdev_set_default_mgmt_key(rdev, dev, i)) 922 netdev_err(dev, "failed to set mgtdef %d\n", i); 923 } 924 925 kzfree(wdev->connect_keys); 926 wdev->connect_keys = NULL; 927 } 928 929 void cfg80211_process_wdev_events(struct wireless_dev *wdev) 930 { 931 struct cfg80211_event *ev; 932 unsigned long flags; 933 const u8 *bssid = NULL; 934 935 spin_lock_irqsave(&wdev->event_lock, flags); 936 while (!list_empty(&wdev->event_list)) { 937 ev = list_first_entry(&wdev->event_list, 938 struct cfg80211_event, list); 939 list_del(&ev->list); 940 spin_unlock_irqrestore(&wdev->event_lock, flags); 941 942 wdev_lock(wdev); 943 switch (ev->type) { 944 case EVENT_CONNECT_RESULT: 945 if (!is_zero_ether_addr(ev->cr.bssid)) 946 bssid = ev->cr.bssid; 947 __cfg80211_connect_result( 948 wdev->netdev, bssid, 949 ev->cr.req_ie, ev->cr.req_ie_len, 950 ev->cr.resp_ie, ev->cr.resp_ie_len, 951 ev->cr.status, 952 ev->cr.status == WLAN_STATUS_SUCCESS, 953 ev->cr.bss); 954 break; 955 case EVENT_ROAMED: 956 __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie, 957 ev->rm.req_ie_len, ev->rm.resp_ie, 958 ev->rm.resp_ie_len); 959 break; 960 case EVENT_DISCONNECTED: 961 __cfg80211_disconnected(wdev->netdev, 962 ev->dc.ie, ev->dc.ie_len, 963 ev->dc.reason, 964 !ev->dc.locally_generated); 965 break; 966 case EVENT_IBSS_JOINED: 967 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid, 968 ev->ij.channel); 969 break; 970 case EVENT_STOPPED: 971 __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev); 972 break; 973 } 974 wdev_unlock(wdev); 975 976 kfree(ev); 977 978 spin_lock_irqsave(&wdev->event_lock, flags); 979 } 980 spin_unlock_irqrestore(&wdev->event_lock, flags); 981 } 982 983 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev) 984 { 985 struct wireless_dev *wdev; 986 987 ASSERT_RTNL(); 988 989 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) 990 cfg80211_process_wdev_events(wdev); 991 } 992 993 int cfg80211_change_iface(struct cfg80211_registered_device *rdev, 994 struct net_device *dev, enum nl80211_iftype ntype, 995 u32 *flags, struct vif_params *params) 996 { 997 int err; 998 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype; 999 1000 ASSERT_RTNL(); 1001 1002 /* don't support changing VLANs, you just re-create them */ 1003 if (otype == NL80211_IFTYPE_AP_VLAN) 1004 return -EOPNOTSUPP; 1005 1006 /* cannot change into P2P device type */ 1007 if (ntype == NL80211_IFTYPE_P2P_DEVICE) 1008 return -EOPNOTSUPP; 1009 1010 if (!rdev->ops->change_virtual_intf || 1011 !(rdev->wiphy.interface_modes & (1 << ntype))) 1012 return -EOPNOTSUPP; 1013 1014 /* if it's part of a bridge, reject changing type to station/ibss */ 1015 if ((dev->priv_flags & IFF_BRIDGE_PORT) && 1016 (ntype == NL80211_IFTYPE_ADHOC || 1017 ntype == NL80211_IFTYPE_STATION || 1018 ntype == NL80211_IFTYPE_P2P_CLIENT)) 1019 return -EBUSY; 1020 1021 if (ntype != otype) { 1022 dev->ieee80211_ptr->use_4addr = false; 1023 dev->ieee80211_ptr->mesh_id_up_len = 0; 1024 wdev_lock(dev->ieee80211_ptr); 1025 rdev_set_qos_map(rdev, dev, NULL); 1026 wdev_unlock(dev->ieee80211_ptr); 1027 1028 switch (otype) { 1029 case NL80211_IFTYPE_AP: 1030 cfg80211_stop_ap(rdev, dev, true); 1031 break; 1032 case NL80211_IFTYPE_ADHOC: 1033 cfg80211_leave_ibss(rdev, dev, false); 1034 break; 1035 case NL80211_IFTYPE_STATION: 1036 case NL80211_IFTYPE_P2P_CLIENT: 1037 wdev_lock(dev->ieee80211_ptr); 1038 cfg80211_disconnect(rdev, dev, 1039 WLAN_REASON_DEAUTH_LEAVING, true); 1040 wdev_unlock(dev->ieee80211_ptr); 1041 break; 1042 case NL80211_IFTYPE_MESH_POINT: 1043 /* mesh should be handled? */ 1044 break; 1045 default: 1046 break; 1047 } 1048 1049 cfg80211_process_rdev_events(rdev); 1050 } 1051 1052 err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params); 1053 1054 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype); 1055 1056 if (!err && params && params->use_4addr != -1) 1057 dev->ieee80211_ptr->use_4addr = params->use_4addr; 1058 1059 if (!err) { 1060 dev->priv_flags &= ~IFF_DONT_BRIDGE; 1061 switch (ntype) { 1062 case NL80211_IFTYPE_STATION: 1063 if (dev->ieee80211_ptr->use_4addr) 1064 break; 1065 /* fall through */ 1066 case NL80211_IFTYPE_OCB: 1067 case NL80211_IFTYPE_P2P_CLIENT: 1068 case NL80211_IFTYPE_ADHOC: 1069 dev->priv_flags |= IFF_DONT_BRIDGE; 1070 break; 1071 case NL80211_IFTYPE_P2P_GO: 1072 case NL80211_IFTYPE_AP: 1073 case NL80211_IFTYPE_AP_VLAN: 1074 case NL80211_IFTYPE_WDS: 1075 case NL80211_IFTYPE_MESH_POINT: 1076 /* bridging OK */ 1077 break; 1078 case NL80211_IFTYPE_MONITOR: 1079 /* monitor can't bridge anyway */ 1080 break; 1081 case NL80211_IFTYPE_UNSPECIFIED: 1082 case NUM_NL80211_IFTYPES: 1083 /* not happening */ 1084 break; 1085 case NL80211_IFTYPE_P2P_DEVICE: 1086 WARN_ON(1); 1087 break; 1088 } 1089 } 1090 1091 if (!err && ntype != otype && netif_running(dev)) { 1092 cfg80211_update_iface_num(rdev, ntype, 1); 1093 cfg80211_update_iface_num(rdev, otype, -1); 1094 } 1095 1096 return err; 1097 } 1098 1099 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate) 1100 { 1101 static const u32 __mcs2bitrate[] = { 1102 /* control PHY */ 1103 [0] = 275, 1104 /* SC PHY */ 1105 [1] = 3850, 1106 [2] = 7700, 1107 [3] = 9625, 1108 [4] = 11550, 1109 [5] = 12512, /* 1251.25 mbps */ 1110 [6] = 15400, 1111 [7] = 19250, 1112 [8] = 23100, 1113 [9] = 25025, 1114 [10] = 30800, 1115 [11] = 38500, 1116 [12] = 46200, 1117 /* OFDM PHY */ 1118 [13] = 6930, 1119 [14] = 8662, /* 866.25 mbps */ 1120 [15] = 13860, 1121 [16] = 17325, 1122 [17] = 20790, 1123 [18] = 27720, 1124 [19] = 34650, 1125 [20] = 41580, 1126 [21] = 45045, 1127 [22] = 51975, 1128 [23] = 62370, 1129 [24] = 67568, /* 6756.75 mbps */ 1130 /* LP-SC PHY */ 1131 [25] = 6260, 1132 [26] = 8340, 1133 [27] = 11120, 1134 [28] = 12510, 1135 [29] = 16680, 1136 [30] = 22240, 1137 [31] = 25030, 1138 }; 1139 1140 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate))) 1141 return 0; 1142 1143 return __mcs2bitrate[rate->mcs]; 1144 } 1145 1146 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate) 1147 { 1148 static const u32 base[4][10] = { 1149 { 6500000, 1150 13000000, 1151 19500000, 1152 26000000, 1153 39000000, 1154 52000000, 1155 58500000, 1156 65000000, 1157 78000000, 1158 0, 1159 }, 1160 { 13500000, 1161 27000000, 1162 40500000, 1163 54000000, 1164 81000000, 1165 108000000, 1166 121500000, 1167 135000000, 1168 162000000, 1169 180000000, 1170 }, 1171 { 29300000, 1172 58500000, 1173 87800000, 1174 117000000, 1175 175500000, 1176 234000000, 1177 263300000, 1178 292500000, 1179 351000000, 1180 390000000, 1181 }, 1182 { 58500000, 1183 117000000, 1184 175500000, 1185 234000000, 1186 351000000, 1187 468000000, 1188 526500000, 1189 585000000, 1190 702000000, 1191 780000000, 1192 }, 1193 }; 1194 u32 bitrate; 1195 int idx; 1196 1197 if (WARN_ON_ONCE(rate->mcs > 9)) 1198 return 0; 1199 1200 switch (rate->bw) { 1201 case RATE_INFO_BW_160: 1202 idx = 3; 1203 break; 1204 case RATE_INFO_BW_80: 1205 idx = 2; 1206 break; 1207 case RATE_INFO_BW_40: 1208 idx = 1; 1209 break; 1210 case RATE_INFO_BW_5: 1211 case RATE_INFO_BW_10: 1212 default: 1213 WARN_ON(1); 1214 /* fall through */ 1215 case RATE_INFO_BW_20: 1216 idx = 0; 1217 } 1218 1219 bitrate = base[idx][rate->mcs]; 1220 bitrate *= rate->nss; 1221 1222 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI) 1223 bitrate = (bitrate / 9) * 10; 1224 1225 /* do NOT round down here */ 1226 return (bitrate + 50000) / 100000; 1227 } 1228 1229 u32 cfg80211_calculate_bitrate(struct rate_info *rate) 1230 { 1231 int modulation, streams, bitrate; 1232 1233 if (!(rate->flags & RATE_INFO_FLAGS_MCS) && 1234 !(rate->flags & RATE_INFO_FLAGS_VHT_MCS)) 1235 return rate->legacy; 1236 if (rate->flags & RATE_INFO_FLAGS_60G) 1237 return cfg80211_calculate_bitrate_60g(rate); 1238 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS) 1239 return cfg80211_calculate_bitrate_vht(rate); 1240 1241 /* the formula below does only work for MCS values smaller than 32 */ 1242 if (WARN_ON_ONCE(rate->mcs >= 32)) 1243 return 0; 1244 1245 modulation = rate->mcs & 7; 1246 streams = (rate->mcs >> 3) + 1; 1247 1248 bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000; 1249 1250 if (modulation < 4) 1251 bitrate *= (modulation + 1); 1252 else if (modulation == 4) 1253 bitrate *= (modulation + 2); 1254 else 1255 bitrate *= (modulation + 3); 1256 1257 bitrate *= streams; 1258 1259 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI) 1260 bitrate = (bitrate / 9) * 10; 1261 1262 /* do NOT round down here */ 1263 return (bitrate + 50000) / 100000; 1264 } 1265 EXPORT_SYMBOL(cfg80211_calculate_bitrate); 1266 1267 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len, 1268 enum ieee80211_p2p_attr_id attr, 1269 u8 *buf, unsigned int bufsize) 1270 { 1271 u8 *out = buf; 1272 u16 attr_remaining = 0; 1273 bool desired_attr = false; 1274 u16 desired_len = 0; 1275 1276 while (len > 0) { 1277 unsigned int iedatalen; 1278 unsigned int copy; 1279 const u8 *iedata; 1280 1281 if (len < 2) 1282 return -EILSEQ; 1283 iedatalen = ies[1]; 1284 if (iedatalen + 2 > len) 1285 return -EILSEQ; 1286 1287 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC) 1288 goto cont; 1289 1290 if (iedatalen < 4) 1291 goto cont; 1292 1293 iedata = ies + 2; 1294 1295 /* check WFA OUI, P2P subtype */ 1296 if (iedata[0] != 0x50 || iedata[1] != 0x6f || 1297 iedata[2] != 0x9a || iedata[3] != 0x09) 1298 goto cont; 1299 1300 iedatalen -= 4; 1301 iedata += 4; 1302 1303 /* check attribute continuation into this IE */ 1304 copy = min_t(unsigned int, attr_remaining, iedatalen); 1305 if (copy && desired_attr) { 1306 desired_len += copy; 1307 if (out) { 1308 memcpy(out, iedata, min(bufsize, copy)); 1309 out += min(bufsize, copy); 1310 bufsize -= min(bufsize, copy); 1311 } 1312 1313 1314 if (copy == attr_remaining) 1315 return desired_len; 1316 } 1317 1318 attr_remaining -= copy; 1319 if (attr_remaining) 1320 goto cont; 1321 1322 iedatalen -= copy; 1323 iedata += copy; 1324 1325 while (iedatalen > 0) { 1326 u16 attr_len; 1327 1328 /* P2P attribute ID & size must fit */ 1329 if (iedatalen < 3) 1330 return -EILSEQ; 1331 desired_attr = iedata[0] == attr; 1332 attr_len = get_unaligned_le16(iedata + 1); 1333 iedatalen -= 3; 1334 iedata += 3; 1335 1336 copy = min_t(unsigned int, attr_len, iedatalen); 1337 1338 if (desired_attr) { 1339 desired_len += copy; 1340 if (out) { 1341 memcpy(out, iedata, min(bufsize, copy)); 1342 out += min(bufsize, copy); 1343 bufsize -= min(bufsize, copy); 1344 } 1345 1346 if (copy == attr_len) 1347 return desired_len; 1348 } 1349 1350 iedata += copy; 1351 iedatalen -= copy; 1352 attr_remaining = attr_len - copy; 1353 } 1354 1355 cont: 1356 len -= ies[1] + 2; 1357 ies += ies[1] + 2; 1358 } 1359 1360 if (attr_remaining && desired_attr) 1361 return -EILSEQ; 1362 1363 return -ENOENT; 1364 } 1365 EXPORT_SYMBOL(cfg80211_get_p2p_attr); 1366 1367 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id) 1368 { 1369 int i; 1370 1371 for (i = 0; i < n_ids; i++) 1372 if (ids[i] == id) 1373 return true; 1374 return false; 1375 } 1376 1377 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen, 1378 const u8 *ids, int n_ids, 1379 const u8 *after_ric, int n_after_ric, 1380 size_t offset) 1381 { 1382 size_t pos = offset; 1383 1384 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) { 1385 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) { 1386 pos += 2 + ies[pos + 1]; 1387 1388 while (pos < ielen && 1389 !ieee80211_id_in_list(after_ric, n_after_ric, 1390 ies[pos])) 1391 pos += 2 + ies[pos + 1]; 1392 } else { 1393 pos += 2 + ies[pos + 1]; 1394 } 1395 } 1396 1397 return pos; 1398 } 1399 EXPORT_SYMBOL(ieee80211_ie_split_ric); 1400 1401 bool ieee80211_operating_class_to_band(u8 operating_class, 1402 enum nl80211_band *band) 1403 { 1404 switch (operating_class) { 1405 case 112: 1406 case 115 ... 127: 1407 case 128 ... 130: 1408 *band = NL80211_BAND_5GHZ; 1409 return true; 1410 case 81: 1411 case 82: 1412 case 83: 1413 case 84: 1414 *band = NL80211_BAND_2GHZ; 1415 return true; 1416 case 180: 1417 *band = NL80211_BAND_60GHZ; 1418 return true; 1419 } 1420 1421 return false; 1422 } 1423 EXPORT_SYMBOL(ieee80211_operating_class_to_band); 1424 1425 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef, 1426 u8 *op_class) 1427 { 1428 u8 vht_opclass; 1429 u16 freq = chandef->center_freq1; 1430 1431 if (freq >= 2412 && freq <= 2472) { 1432 if (chandef->width > NL80211_CHAN_WIDTH_40) 1433 return false; 1434 1435 /* 2.407 GHz, channels 1..13 */ 1436 if (chandef->width == NL80211_CHAN_WIDTH_40) { 1437 if (freq > chandef->chan->center_freq) 1438 *op_class = 83; /* HT40+ */ 1439 else 1440 *op_class = 84; /* HT40- */ 1441 } else { 1442 *op_class = 81; 1443 } 1444 1445 return true; 1446 } 1447 1448 if (freq == 2484) { 1449 if (chandef->width > NL80211_CHAN_WIDTH_40) 1450 return false; 1451 1452 *op_class = 82; /* channel 14 */ 1453 return true; 1454 } 1455 1456 switch (chandef->width) { 1457 case NL80211_CHAN_WIDTH_80: 1458 vht_opclass = 128; 1459 break; 1460 case NL80211_CHAN_WIDTH_160: 1461 vht_opclass = 129; 1462 break; 1463 case NL80211_CHAN_WIDTH_80P80: 1464 vht_opclass = 130; 1465 break; 1466 case NL80211_CHAN_WIDTH_10: 1467 case NL80211_CHAN_WIDTH_5: 1468 return false; /* unsupported for now */ 1469 default: 1470 vht_opclass = 0; 1471 break; 1472 } 1473 1474 /* 5 GHz, channels 36..48 */ 1475 if (freq >= 5180 && freq <= 5240) { 1476 if (vht_opclass) { 1477 *op_class = vht_opclass; 1478 } else if (chandef->width == NL80211_CHAN_WIDTH_40) { 1479 if (freq > chandef->chan->center_freq) 1480 *op_class = 116; 1481 else 1482 *op_class = 117; 1483 } else { 1484 *op_class = 115; 1485 } 1486 1487 return true; 1488 } 1489 1490 /* 5 GHz, channels 52..64 */ 1491 if (freq >= 5260 && freq <= 5320) { 1492 if (vht_opclass) { 1493 *op_class = vht_opclass; 1494 } else if (chandef->width == NL80211_CHAN_WIDTH_40) { 1495 if (freq > chandef->chan->center_freq) 1496 *op_class = 119; 1497 else 1498 *op_class = 120; 1499 } else { 1500 *op_class = 118; 1501 } 1502 1503 return true; 1504 } 1505 1506 /* 5 GHz, channels 100..144 */ 1507 if (freq >= 5500 && freq <= 5720) { 1508 if (vht_opclass) { 1509 *op_class = vht_opclass; 1510 } else if (chandef->width == NL80211_CHAN_WIDTH_40) { 1511 if (freq > chandef->chan->center_freq) 1512 *op_class = 122; 1513 else 1514 *op_class = 123; 1515 } else { 1516 *op_class = 121; 1517 } 1518 1519 return true; 1520 } 1521 1522 /* 5 GHz, channels 149..169 */ 1523 if (freq >= 5745 && freq <= 5845) { 1524 if (vht_opclass) { 1525 *op_class = vht_opclass; 1526 } else if (chandef->width == NL80211_CHAN_WIDTH_40) { 1527 if (freq > chandef->chan->center_freq) 1528 *op_class = 126; 1529 else 1530 *op_class = 127; 1531 } else if (freq <= 5805) { 1532 *op_class = 124; 1533 } else { 1534 *op_class = 125; 1535 } 1536 1537 return true; 1538 } 1539 1540 /* 56.16 GHz, channel 1..4 */ 1541 if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) { 1542 if (chandef->width >= NL80211_CHAN_WIDTH_40) 1543 return false; 1544 1545 *op_class = 180; 1546 return true; 1547 } 1548 1549 /* not supported yet */ 1550 return false; 1551 } 1552 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class); 1553 1554 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev, 1555 u32 beacon_int) 1556 { 1557 struct wireless_dev *wdev; 1558 int res = 0; 1559 1560 if (!beacon_int) 1561 return -EINVAL; 1562 1563 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 1564 if (!wdev->beacon_interval) 1565 continue; 1566 if (wdev->beacon_interval != beacon_int) { 1567 res = -EINVAL; 1568 break; 1569 } 1570 } 1571 1572 return res; 1573 } 1574 1575 int cfg80211_iter_combinations(struct wiphy *wiphy, 1576 const int num_different_channels, 1577 const u8 radar_detect, 1578 const int iftype_num[NUM_NL80211_IFTYPES], 1579 void (*iter)(const struct ieee80211_iface_combination *c, 1580 void *data), 1581 void *data) 1582 { 1583 const struct ieee80211_regdomain *regdom; 1584 enum nl80211_dfs_regions region = 0; 1585 int i, j, iftype; 1586 int num_interfaces = 0; 1587 u32 used_iftypes = 0; 1588 1589 if (radar_detect) { 1590 rcu_read_lock(); 1591 regdom = rcu_dereference(cfg80211_regdomain); 1592 if (regdom) 1593 region = regdom->dfs_region; 1594 rcu_read_unlock(); 1595 } 1596 1597 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) { 1598 num_interfaces += iftype_num[iftype]; 1599 if (iftype_num[iftype] > 0 && 1600 !(wiphy->software_iftypes & BIT(iftype))) 1601 used_iftypes |= BIT(iftype); 1602 } 1603 1604 for (i = 0; i < wiphy->n_iface_combinations; i++) { 1605 const struct ieee80211_iface_combination *c; 1606 struct ieee80211_iface_limit *limits; 1607 u32 all_iftypes = 0; 1608 1609 c = &wiphy->iface_combinations[i]; 1610 1611 if (num_interfaces > c->max_interfaces) 1612 continue; 1613 if (num_different_channels > c->num_different_channels) 1614 continue; 1615 1616 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits, 1617 GFP_KERNEL); 1618 if (!limits) 1619 return -ENOMEM; 1620 1621 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) { 1622 if (wiphy->software_iftypes & BIT(iftype)) 1623 continue; 1624 for (j = 0; j < c->n_limits; j++) { 1625 all_iftypes |= limits[j].types; 1626 if (!(limits[j].types & BIT(iftype))) 1627 continue; 1628 if (limits[j].max < iftype_num[iftype]) 1629 goto cont; 1630 limits[j].max -= iftype_num[iftype]; 1631 } 1632 } 1633 1634 if (radar_detect != (c->radar_detect_widths & radar_detect)) 1635 goto cont; 1636 1637 if (radar_detect && c->radar_detect_regions && 1638 !(c->radar_detect_regions & BIT(region))) 1639 goto cont; 1640 1641 /* Finally check that all iftypes that we're currently 1642 * using are actually part of this combination. If they 1643 * aren't then we can't use this combination and have 1644 * to continue to the next. 1645 */ 1646 if ((all_iftypes & used_iftypes) != used_iftypes) 1647 goto cont; 1648 1649 /* This combination covered all interface types and 1650 * supported the requested numbers, so we're good. 1651 */ 1652 1653 (*iter)(c, data); 1654 cont: 1655 kfree(limits); 1656 } 1657 1658 return 0; 1659 } 1660 EXPORT_SYMBOL(cfg80211_iter_combinations); 1661 1662 static void 1663 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c, 1664 void *data) 1665 { 1666 int *num = data; 1667 (*num)++; 1668 } 1669 1670 int cfg80211_check_combinations(struct wiphy *wiphy, 1671 const int num_different_channels, 1672 const u8 radar_detect, 1673 const int iftype_num[NUM_NL80211_IFTYPES]) 1674 { 1675 int err, num = 0; 1676 1677 err = cfg80211_iter_combinations(wiphy, num_different_channels, 1678 radar_detect, iftype_num, 1679 cfg80211_iter_sum_ifcombs, &num); 1680 if (err) 1681 return err; 1682 if (num == 0) 1683 return -EBUSY; 1684 1685 return 0; 1686 } 1687 EXPORT_SYMBOL(cfg80211_check_combinations); 1688 1689 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband, 1690 const u8 *rates, unsigned int n_rates, 1691 u32 *mask) 1692 { 1693 int i, j; 1694 1695 if (!sband) 1696 return -EINVAL; 1697 1698 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES) 1699 return -EINVAL; 1700 1701 *mask = 0; 1702 1703 for (i = 0; i < n_rates; i++) { 1704 int rate = (rates[i] & 0x7f) * 5; 1705 bool found = false; 1706 1707 for (j = 0; j < sband->n_bitrates; j++) { 1708 if (sband->bitrates[j].bitrate == rate) { 1709 found = true; 1710 *mask |= BIT(j); 1711 break; 1712 } 1713 } 1714 if (!found) 1715 return -EINVAL; 1716 } 1717 1718 /* 1719 * mask must have at least one bit set here since we 1720 * didn't accept a 0-length rates array nor allowed 1721 * entries in the array that didn't exist 1722 */ 1723 1724 return 0; 1725 } 1726 1727 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy) 1728 { 1729 enum nl80211_band band; 1730 unsigned int n_channels = 0; 1731 1732 for (band = 0; band < NUM_NL80211_BANDS; band++) 1733 if (wiphy->bands[band]) 1734 n_channels += wiphy->bands[band]->n_channels; 1735 1736 return n_channels; 1737 } 1738 EXPORT_SYMBOL(ieee80211_get_num_supported_channels); 1739 1740 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr, 1741 struct station_info *sinfo) 1742 { 1743 struct cfg80211_registered_device *rdev; 1744 struct wireless_dev *wdev; 1745 1746 wdev = dev->ieee80211_ptr; 1747 if (!wdev) 1748 return -EOPNOTSUPP; 1749 1750 rdev = wiphy_to_rdev(wdev->wiphy); 1751 if (!rdev->ops->get_station) 1752 return -EOPNOTSUPP; 1753 1754 return rdev_get_station(rdev, dev, mac_addr, sinfo); 1755 } 1756 EXPORT_SYMBOL(cfg80211_get_station); 1757 1758 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ 1759 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ 1760 const unsigned char rfc1042_header[] __aligned(2) = 1761 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; 1762 EXPORT_SYMBOL(rfc1042_header); 1763 1764 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ 1765 const unsigned char bridge_tunnel_header[] __aligned(2) = 1766 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; 1767 EXPORT_SYMBOL(bridge_tunnel_header); 1768