1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 * Copyright (C) 2015-2017 Intel Deutschland GmbH 9 * Copyright (C) 2018-2024 Intel Corporation 10 * 11 * element parsing for mac80211 12 */ 13 14 #include <net/mac80211.h> 15 #include <linux/netdevice.h> 16 #include <linux/export.h> 17 #include <linux/types.h> 18 #include <linux/slab.h> 19 #include <linux/skbuff.h> 20 #include <linux/etherdevice.h> 21 #include <linux/if_arp.h> 22 #include <linux/bitmap.h> 23 #include <linux/crc32.h> 24 #include <net/net_namespace.h> 25 #include <net/cfg80211.h> 26 #include <net/rtnetlink.h> 27 #include <kunit/visibility.h> 28 29 #include "ieee80211_i.h" 30 #include "driver-ops.h" 31 #include "rate.h" 32 #include "mesh.h" 33 #include "wme.h" 34 #include "led.h" 35 #include "wep.h" 36 37 struct ieee80211_elems_parse { 38 /* must be first for kfree to work */ 39 struct ieee802_11_elems elems; 40 41 /* The basic Multi-Link element in the original elements */ 42 const struct element *ml_basic_elem; 43 44 /* The reconfiguration Multi-Link element in the original elements */ 45 const struct element *ml_reconf_elem; 46 47 /* The EPCS Multi-Link element in the original elements */ 48 const struct element *ml_epcs_elem; 49 50 bool multi_link_inner; 51 bool skip_vendor; 52 53 /* 54 * scratch buffer that can be used for various element parsing related 55 * tasks, e.g., element de-fragmentation etc. 56 */ 57 size_t scratch_len; 58 u8 *scratch_pos; 59 u8 scratch[] __counted_by(scratch_len); 60 }; 61 62 static void 63 ieee80211_parse_extension_element(u32 *crc, 64 const struct element *elem, 65 struct ieee80211_elems_parse *elems_parse, 66 struct ieee80211_elems_parse_params *params) 67 { 68 struct ieee802_11_elems *elems = &elems_parse->elems; 69 const void *data = elem->data + 1; 70 bool calc_crc = false; 71 u8 len; 72 73 if (!elem->datalen) 74 return; 75 76 len = elem->datalen - 1; 77 78 switch (elem->data[0]) { 79 case WLAN_EID_EXT_HE_MU_EDCA: 80 if (params->mode < IEEE80211_CONN_MODE_HE) 81 break; 82 calc_crc = true; 83 if (len >= sizeof(*elems->mu_edca_param_set)) 84 elems->mu_edca_param_set = data; 85 break; 86 case WLAN_EID_EXT_HE_CAPABILITY: 87 if (params->mode < IEEE80211_CONN_MODE_HE) 88 break; 89 if (ieee80211_he_capa_size_ok(data, len)) { 90 elems->he_cap = data; 91 elems->he_cap_len = len; 92 } 93 break; 94 case WLAN_EID_EXT_HE_OPERATION: 95 if (params->mode < IEEE80211_CONN_MODE_HE) 96 break; 97 calc_crc = true; 98 if (len >= sizeof(*elems->he_operation) && 99 len >= ieee80211_he_oper_size(data) - 1) 100 elems->he_operation = data; 101 break; 102 case WLAN_EID_EXT_UORA: 103 if (params->mode < IEEE80211_CONN_MODE_HE) 104 break; 105 if (len >= 1) 106 elems->uora_element = data; 107 break; 108 case WLAN_EID_EXT_MAX_CHANNEL_SWITCH_TIME: 109 if (len == 3) 110 elems->max_channel_switch_time = data; 111 break; 112 case WLAN_EID_EXT_MULTIPLE_BSSID_CONFIGURATION: 113 if (len >= sizeof(*elems->mbssid_config_ie)) 114 elems->mbssid_config_ie = data; 115 break; 116 case WLAN_EID_EXT_HE_SPR: 117 if (params->mode < IEEE80211_CONN_MODE_HE) 118 break; 119 if (len >= sizeof(*elems->he_spr) && 120 len >= ieee80211_he_spr_size(data) - 1) 121 elems->he_spr = data; 122 break; 123 case WLAN_EID_EXT_HE_6GHZ_CAPA: 124 if (params->mode < IEEE80211_CONN_MODE_HE) 125 break; 126 if (len >= sizeof(*elems->he_6ghz_capa)) 127 elems->he_6ghz_capa = data; 128 break; 129 case WLAN_EID_EXT_EHT_CAPABILITY: 130 if (params->mode < IEEE80211_CONN_MODE_EHT) 131 break; 132 if (ieee80211_eht_capa_size_ok(elems->he_cap, 133 data, len, 134 params->from_ap)) { 135 elems->eht_cap = data; 136 elems->eht_cap_len = len; 137 } 138 break; 139 case WLAN_EID_EXT_EHT_OPERATION: 140 if (params->mode < IEEE80211_CONN_MODE_EHT) 141 break; 142 if (ieee80211_eht_oper_size_ok(data, len)) 143 elems->eht_operation = data; 144 calc_crc = true; 145 break; 146 case WLAN_EID_EXT_EHT_MULTI_LINK: 147 if (params->mode < IEEE80211_CONN_MODE_EHT) 148 break; 149 calc_crc = true; 150 151 if (ieee80211_mle_size_ok(data, len)) { 152 const struct ieee80211_multi_link_elem *mle = 153 (void *)data; 154 155 switch (le16_get_bits(mle->control, 156 IEEE80211_ML_CONTROL_TYPE)) { 157 case IEEE80211_ML_CONTROL_TYPE_BASIC: 158 if (elems_parse->multi_link_inner) { 159 elems->parse_error |= 160 IEEE80211_PARSE_ERR_DUP_NEST_ML_BASIC; 161 break; 162 } 163 break; 164 case IEEE80211_ML_CONTROL_TYPE_RECONF: 165 elems_parse->ml_reconf_elem = elem; 166 break; 167 case IEEE80211_ML_CONTROL_TYPE_PRIO_ACCESS: 168 elems_parse->ml_epcs_elem = elem; 169 break; 170 default: 171 break; 172 } 173 } 174 break; 175 case WLAN_EID_EXT_BANDWIDTH_INDICATION: 176 if (params->mode < IEEE80211_CONN_MODE_EHT) 177 break; 178 if (ieee80211_bandwidth_indication_size_ok(data, len)) 179 elems->bandwidth_indication = data; 180 calc_crc = true; 181 break; 182 case WLAN_EID_EXT_TID_TO_LINK_MAPPING: 183 if (params->mode < IEEE80211_CONN_MODE_EHT) 184 break; 185 calc_crc = true; 186 if (ieee80211_tid_to_link_map_size_ok(data, len) && 187 elems->ttlm_num < ARRAY_SIZE(elems->ttlm)) { 188 elems->ttlm[elems->ttlm_num] = (void *)data; 189 elems->ttlm_num++; 190 } 191 break; 192 } 193 194 if (crc && calc_crc) 195 *crc = crc32_be(*crc, (void *)elem, elem->datalen + 2); 196 } 197 198 static void ieee80211_parse_tpe(struct ieee80211_parsed_tpe *tpe, 199 const u8 *data, u8 len) 200 { 201 const struct ieee80211_tx_pwr_env *env = (const void *)data; 202 u8 count, interpret, category; 203 u8 *out, N, *cnt_out = NULL, *N_out = NULL; 204 205 if (!ieee80211_valid_tpe_element(data, len)) 206 return; 207 208 count = u8_get_bits(env->info, IEEE80211_TX_PWR_ENV_INFO_COUNT); 209 interpret = u8_get_bits(env->info, IEEE80211_TX_PWR_ENV_INFO_INTERPRET); 210 category = u8_get_bits(env->info, IEEE80211_TX_PWR_ENV_INFO_CATEGORY); 211 212 switch (interpret) { 213 case IEEE80211_TPE_LOCAL_EIRP: 214 out = tpe->max_local[category].power; 215 cnt_out = &tpe->max_local[category].count; 216 tpe->max_local[category].valid = true; 217 break; 218 case IEEE80211_TPE_REG_CLIENT_EIRP: 219 out = tpe->max_reg_client[category].power; 220 cnt_out = &tpe->max_reg_client[category].count; 221 tpe->max_reg_client[category].valid = true; 222 break; 223 case IEEE80211_TPE_LOCAL_EIRP_PSD: 224 out = tpe->psd_local[category].power; 225 cnt_out = &tpe->psd_local[category].count; 226 N_out = &tpe->psd_local[category].n; 227 tpe->psd_local[category].valid = true; 228 break; 229 case IEEE80211_TPE_REG_CLIENT_EIRP_PSD: 230 out = tpe->psd_reg_client[category].power; 231 cnt_out = &tpe->psd_reg_client[category].count; 232 N_out = &tpe->psd_reg_client[category].n; 233 tpe->psd_reg_client[category].valid = true; 234 break; 235 } 236 237 switch (interpret) { 238 case IEEE80211_TPE_LOCAL_EIRP: 239 case IEEE80211_TPE_REG_CLIENT_EIRP: 240 /* count was validated <= 3, plus 320 MHz */ 241 BUILD_BUG_ON(IEEE80211_TPE_EIRP_ENTRIES_320MHZ < 5); 242 memcpy(out, env->variable, count + 1); 243 *cnt_out = count + 1; 244 /* separately take 320 MHz if present */ 245 if (count == 3 && len > sizeof(*env) + count + 1) { 246 out[4] = env->variable[4]; 247 *cnt_out = 5; 248 } 249 break; 250 case IEEE80211_TPE_LOCAL_EIRP_PSD: 251 case IEEE80211_TPE_REG_CLIENT_EIRP_PSD: 252 if (!count) { 253 memset(out, env->variable[0], 254 IEEE80211_TPE_PSD_ENTRIES_320MHZ); 255 *cnt_out = IEEE80211_TPE_PSD_ENTRIES_320MHZ; 256 break; 257 } 258 259 N = 1 << (count - 1); 260 memcpy(out, env->variable, N); 261 *cnt_out = N; 262 *N_out = N; 263 264 if (len > sizeof(*env) + N) { 265 int K = u8_get_bits(env->variable[N], 266 IEEE80211_TX_PWR_ENV_EXT_COUNT); 267 268 K = min(K, IEEE80211_TPE_PSD_ENTRIES_320MHZ - N); 269 memcpy(out + N, env->variable + N + 1, K); 270 (*cnt_out) += K; 271 } 272 break; 273 } 274 } 275 276 static u32 277 _ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params, 278 struct ieee80211_elems_parse *elems_parse, 279 const struct element *check_inherit) 280 { 281 struct ieee802_11_elems *elems = &elems_parse->elems; 282 const struct element *elem; 283 bool calc_crc = params->filter != 0; 284 DECLARE_BITMAP(seen_elems, 256); 285 u32 crc = params->crc; 286 287 bitmap_zero(seen_elems, 256); 288 289 for_each_element(elem, params->start, params->len) { 290 const struct element *subelem; 291 u8 elem_parse_failed; 292 u8 id = elem->id; 293 u8 elen = elem->datalen; 294 const u8 *pos = elem->data; 295 296 if (check_inherit && 297 !cfg80211_is_element_inherited(elem, 298 check_inherit)) 299 continue; 300 301 switch (id) { 302 case WLAN_EID_SSID: 303 case WLAN_EID_SUPP_RATES: 304 case WLAN_EID_FH_PARAMS: 305 case WLAN_EID_DS_PARAMS: 306 case WLAN_EID_CF_PARAMS: 307 case WLAN_EID_TIM: 308 case WLAN_EID_IBSS_PARAMS: 309 case WLAN_EID_CHALLENGE: 310 case WLAN_EID_RSN: 311 case WLAN_EID_ERP_INFO: 312 case WLAN_EID_EXT_SUPP_RATES: 313 case WLAN_EID_HT_CAPABILITY: 314 case WLAN_EID_HT_OPERATION: 315 case WLAN_EID_VHT_CAPABILITY: 316 case WLAN_EID_VHT_OPERATION: 317 case WLAN_EID_MESH_ID: 318 case WLAN_EID_MESH_CONFIG: 319 case WLAN_EID_PEER_MGMT: 320 case WLAN_EID_PREQ: 321 case WLAN_EID_PREP: 322 case WLAN_EID_PERR: 323 case WLAN_EID_RANN: 324 case WLAN_EID_CHANNEL_SWITCH: 325 case WLAN_EID_EXT_CHANSWITCH_ANN: 326 case WLAN_EID_COUNTRY: 327 case WLAN_EID_PWR_CONSTRAINT: 328 case WLAN_EID_TIMEOUT_INTERVAL: 329 case WLAN_EID_SECONDARY_CHANNEL_OFFSET: 330 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH: 331 case WLAN_EID_CHAN_SWITCH_PARAM: 332 case WLAN_EID_EXT_CAPABILITY: 333 case WLAN_EID_CHAN_SWITCH_TIMING: 334 case WLAN_EID_LINK_ID: 335 case WLAN_EID_BSS_MAX_IDLE_PERIOD: 336 case WLAN_EID_RSNX: 337 case WLAN_EID_S1G_BCN_COMPAT: 338 case WLAN_EID_S1G_CAPABILITIES: 339 case WLAN_EID_S1G_OPERATION: 340 case WLAN_EID_AID_RESPONSE: 341 case WLAN_EID_S1G_SHORT_BCN_INTERVAL: 342 /* 343 * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible 344 * that if the content gets bigger it might be needed more than once 345 */ 346 if (test_bit(id, seen_elems)) { 347 elems->parse_error |= 348 IEEE80211_PARSE_ERR_DUP_ELEM; 349 continue; 350 } 351 break; 352 } 353 354 if (calc_crc && id < 64 && (params->filter & (1ULL << id))) 355 crc = crc32_be(crc, pos - 2, elen + 2); 356 357 elem_parse_failed = 0; 358 359 switch (id) { 360 case WLAN_EID_LINK_ID: 361 if (elen + 2 < sizeof(struct ieee80211_tdls_lnkie)) { 362 elem_parse_failed = 363 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 364 break; 365 } 366 elems->lnk_id = (void *)(pos - 2); 367 break; 368 case WLAN_EID_CHAN_SWITCH_TIMING: 369 if (elen < sizeof(struct ieee80211_ch_switch_timing)) { 370 elem_parse_failed = 371 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 372 break; 373 } 374 elems->ch_sw_timing = (void *)pos; 375 break; 376 case WLAN_EID_EXT_CAPABILITY: 377 elems->ext_capab = pos; 378 elems->ext_capab_len = elen; 379 break; 380 case WLAN_EID_SSID: 381 elems->ssid = pos; 382 elems->ssid_len = elen; 383 break; 384 case WLAN_EID_SUPP_RATES: 385 elems->supp_rates = pos; 386 elems->supp_rates_len = elen; 387 break; 388 case WLAN_EID_DS_PARAMS: 389 if (elen >= 1) 390 elems->ds_params = pos; 391 else 392 elem_parse_failed = 393 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 394 break; 395 case WLAN_EID_TIM: 396 if (elen >= sizeof(struct ieee80211_tim_ie)) { 397 elems->tim = (void *)pos; 398 elems->tim_len = elen; 399 } else 400 elem_parse_failed = 401 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 402 break; 403 case WLAN_EID_VENDOR_SPECIFIC: 404 if (elems_parse->skip_vendor) 405 break; 406 407 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 && 408 pos[2] == 0xf2) { 409 /* Microsoft OUI (00:50:F2) */ 410 411 if (calc_crc) 412 crc = crc32_be(crc, pos - 2, elen + 2); 413 414 if (elen >= 5 && pos[3] == 2) { 415 /* OUI Type 2 - WMM IE */ 416 if (pos[4] == 0) { 417 elems->wmm_info = pos; 418 elems->wmm_info_len = elen; 419 } else if (pos[4] == 1) { 420 elems->wmm_param = pos; 421 elems->wmm_param_len = elen; 422 } 423 } 424 } 425 break; 426 case WLAN_EID_RSN: 427 elems->rsn = pos; 428 elems->rsn_len = elen; 429 break; 430 case WLAN_EID_ERP_INFO: 431 if (elen >= 1) 432 elems->erp_info = pos; 433 else 434 elem_parse_failed = 435 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 436 break; 437 case WLAN_EID_EXT_SUPP_RATES: 438 elems->ext_supp_rates = pos; 439 elems->ext_supp_rates_len = elen; 440 break; 441 case WLAN_EID_HT_CAPABILITY: 442 if (params->mode < IEEE80211_CONN_MODE_HT) 443 break; 444 if (elen >= sizeof(struct ieee80211_ht_cap)) 445 elems->ht_cap_elem = (void *)pos; 446 else 447 elem_parse_failed = 448 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 449 break; 450 case WLAN_EID_HT_OPERATION: 451 if (params->mode < IEEE80211_CONN_MODE_HT) 452 break; 453 if (elen >= sizeof(struct ieee80211_ht_operation)) 454 elems->ht_operation = (void *)pos; 455 else 456 elem_parse_failed = 457 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 458 break; 459 case WLAN_EID_VHT_CAPABILITY: 460 if (params->mode < IEEE80211_CONN_MODE_VHT) 461 break; 462 if (elen >= sizeof(struct ieee80211_vht_cap)) 463 elems->vht_cap_elem = (void *)pos; 464 else 465 elem_parse_failed = 466 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 467 break; 468 case WLAN_EID_VHT_OPERATION: 469 if (params->mode < IEEE80211_CONN_MODE_VHT) 470 break; 471 if (elen >= sizeof(struct ieee80211_vht_operation)) { 472 elems->vht_operation = (void *)pos; 473 if (calc_crc) 474 crc = crc32_be(crc, pos - 2, elen + 2); 475 break; 476 } 477 elem_parse_failed = 478 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 479 break; 480 case WLAN_EID_OPMODE_NOTIF: 481 if (params->mode < IEEE80211_CONN_MODE_VHT) 482 break; 483 if (elen > 0) { 484 elems->opmode_notif = pos; 485 if (calc_crc) 486 crc = crc32_be(crc, pos - 2, elen + 2); 487 break; 488 } 489 elem_parse_failed = 490 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 491 break; 492 case WLAN_EID_MESH_ID: 493 elems->mesh_id = pos; 494 elems->mesh_id_len = elen; 495 break; 496 case WLAN_EID_MESH_CONFIG: 497 if (elen >= sizeof(struct ieee80211_meshconf_ie)) 498 elems->mesh_config = (void *)pos; 499 else 500 elem_parse_failed = 501 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 502 break; 503 case WLAN_EID_PEER_MGMT: 504 elems->peering = pos; 505 elems->peering_len = elen; 506 break; 507 case WLAN_EID_MESH_AWAKE_WINDOW: 508 if (elen >= 2) 509 elems->awake_window = (void *)pos; 510 break; 511 case WLAN_EID_PREQ: 512 elems->preq = pos; 513 elems->preq_len = elen; 514 break; 515 case WLAN_EID_PREP: 516 elems->prep = pos; 517 elems->prep_len = elen; 518 break; 519 case WLAN_EID_PERR: 520 elems->perr = pos; 521 elems->perr_len = elen; 522 break; 523 case WLAN_EID_RANN: 524 if (elen >= sizeof(struct ieee80211_rann_ie)) 525 elems->rann = (void *)pos; 526 else 527 elem_parse_failed = 528 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 529 break; 530 case WLAN_EID_CHANNEL_SWITCH: 531 if (elen != sizeof(struct ieee80211_channel_sw_ie)) { 532 elem_parse_failed = 533 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 534 break; 535 } 536 elems->ch_switch_ie = (void *)pos; 537 break; 538 case WLAN_EID_EXT_CHANSWITCH_ANN: 539 if (elen != sizeof(struct ieee80211_ext_chansw_ie)) { 540 elem_parse_failed = 541 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 542 break; 543 } 544 elems->ext_chansw_ie = (void *)pos; 545 break; 546 case WLAN_EID_SECONDARY_CHANNEL_OFFSET: 547 if (params->mode < IEEE80211_CONN_MODE_HT) 548 break; 549 if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) { 550 elem_parse_failed = 551 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 552 break; 553 } 554 elems->sec_chan_offs = (void *)pos; 555 break; 556 case WLAN_EID_CHAN_SWITCH_PARAM: 557 if (elen < 558 sizeof(*elems->mesh_chansw_params_ie)) { 559 elem_parse_failed = 560 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 561 break; 562 } 563 elems->mesh_chansw_params_ie = (void *)pos; 564 break; 565 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH: 566 if (params->mode < IEEE80211_CONN_MODE_VHT) 567 break; 568 569 if (!params->action) { 570 elem_parse_failed = 571 IEEE80211_PARSE_ERR_UNEXPECTED_ELEM; 572 break; 573 } 574 575 if (elen < sizeof(*elems->wide_bw_chansw_ie)) { 576 elem_parse_failed = 577 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 578 break; 579 } 580 elems->wide_bw_chansw_ie = (void *)pos; 581 break; 582 case WLAN_EID_CHANNEL_SWITCH_WRAPPER: 583 if (params->mode < IEEE80211_CONN_MODE_VHT) 584 break; 585 if (params->action) { 586 elem_parse_failed = 587 IEEE80211_PARSE_ERR_UNEXPECTED_ELEM; 588 break; 589 } 590 /* 591 * This is a bit tricky, but as we only care about 592 * a few elements, parse them out manually. 593 */ 594 subelem = cfg80211_find_elem(WLAN_EID_WIDE_BW_CHANNEL_SWITCH, 595 pos, elen); 596 if (subelem) { 597 if (subelem->datalen >= sizeof(*elems->wide_bw_chansw_ie)) 598 elems->wide_bw_chansw_ie = 599 (void *)subelem->data; 600 else 601 elem_parse_failed = 602 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 603 } 604 605 if (params->mode < IEEE80211_CONN_MODE_EHT) 606 break; 607 608 subelem = cfg80211_find_ext_elem(WLAN_EID_EXT_BANDWIDTH_INDICATION, 609 pos, elen); 610 if (subelem) { 611 const void *edata = subelem->data + 1; 612 u8 edatalen = subelem->datalen - 1; 613 614 if (ieee80211_bandwidth_indication_size_ok(edata, 615 edatalen)) 616 elems->bandwidth_indication = edata; 617 else 618 elem_parse_failed = 619 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 620 } 621 622 subelem = cfg80211_find_ext_elem(WLAN_EID_TX_POWER_ENVELOPE, 623 pos, elen); 624 if (subelem) 625 ieee80211_parse_tpe(&elems->csa_tpe, 626 subelem->data + 1, 627 subelem->datalen - 1); 628 break; 629 case WLAN_EID_COUNTRY: 630 elems->country_elem = pos; 631 elems->country_elem_len = elen; 632 break; 633 case WLAN_EID_PWR_CONSTRAINT: 634 if (elen != 1) { 635 elem_parse_failed = 636 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 637 break; 638 } 639 elems->pwr_constr_elem = pos; 640 break; 641 case WLAN_EID_CISCO_VENDOR_SPECIFIC: 642 /* Lots of different options exist, but we only care 643 * about the Dynamic Transmit Power Control element. 644 * First check for the Cisco OUI, then for the DTPC 645 * tag (0x00). 646 */ 647 if (elen < 4) { 648 elem_parse_failed = 649 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 650 break; 651 } 652 653 if (pos[0] != 0x00 || pos[1] != 0x40 || 654 pos[2] != 0x96 || pos[3] != 0x00) 655 break; 656 657 if (elen != 6) { 658 elem_parse_failed = 659 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 660 break; 661 } 662 663 if (calc_crc) 664 crc = crc32_be(crc, pos - 2, elen + 2); 665 666 elems->cisco_dtpc_elem = pos; 667 break; 668 case WLAN_EID_ADDBA_EXT: 669 if (elen < sizeof(struct ieee80211_addba_ext_ie)) { 670 elem_parse_failed = 671 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 672 break; 673 } 674 elems->addba_ext_ie = (void *)pos; 675 break; 676 case WLAN_EID_TIMEOUT_INTERVAL: 677 if (elen >= sizeof(struct ieee80211_timeout_interval_ie)) 678 elems->timeout_int = (void *)pos; 679 else 680 elem_parse_failed = 681 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 682 break; 683 case WLAN_EID_BSS_MAX_IDLE_PERIOD: 684 if (elen >= sizeof(*elems->max_idle_period_ie)) 685 elems->max_idle_period_ie = (void *)pos; 686 break; 687 case WLAN_EID_RSNX: 688 elems->rsnx = pos; 689 elems->rsnx_len = elen; 690 break; 691 case WLAN_EID_TX_POWER_ENVELOPE: 692 if (params->mode < IEEE80211_CONN_MODE_HE) 693 break; 694 ieee80211_parse_tpe(&elems->tpe, pos, elen); 695 break; 696 case WLAN_EID_EXTENSION: 697 ieee80211_parse_extension_element(calc_crc ? 698 &crc : NULL, 699 elem, elems_parse, 700 params); 701 break; 702 case WLAN_EID_S1G_CAPABILITIES: 703 if (params->mode != IEEE80211_CONN_MODE_S1G) 704 break; 705 if (elen >= sizeof(*elems->s1g_capab)) 706 elems->s1g_capab = (void *)pos; 707 else 708 elem_parse_failed = 709 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 710 break; 711 case WLAN_EID_S1G_OPERATION: 712 if (params->mode != IEEE80211_CONN_MODE_S1G) 713 break; 714 if (elen == sizeof(*elems->s1g_oper)) 715 elems->s1g_oper = (void *)pos; 716 else 717 elem_parse_failed = 718 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 719 break; 720 case WLAN_EID_S1G_BCN_COMPAT: 721 if (params->mode != IEEE80211_CONN_MODE_S1G) 722 break; 723 if (elen == sizeof(*elems->s1g_bcn_compat)) 724 elems->s1g_bcn_compat = (void *)pos; 725 else 726 elem_parse_failed = 727 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 728 break; 729 case WLAN_EID_AID_RESPONSE: 730 if (params->mode != IEEE80211_CONN_MODE_S1G) 731 break; 732 if (elen == sizeof(struct ieee80211_aid_response_ie)) 733 elems->aid_resp = (void *)pos; 734 else 735 elem_parse_failed = 736 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE; 737 break; 738 default: 739 break; 740 } 741 742 if (elem_parse_failed) 743 elems->parse_error |= elem_parse_failed; 744 else 745 __set_bit(id, seen_elems); 746 } 747 748 if (!for_each_element_completed(elem, params->start, params->len)) 749 elems->parse_error |= IEEE80211_PARSE_ERR_INVALID_END; 750 751 return crc; 752 } 753 754 static size_t ieee802_11_find_bssid_profile(const u8 *start, size_t len, 755 struct ieee802_11_elems *elems, 756 struct cfg80211_bss *bss, 757 u8 *nontransmitted_profile) 758 { 759 const struct element *elem, *sub; 760 size_t profile_len = 0; 761 bool found = false; 762 763 if (!bss || !bss->transmitted_bss) 764 return profile_len; 765 766 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, start, len) { 767 if (elem->datalen < 2) 768 continue; 769 if (elem->data[0] < 1 || elem->data[0] > 8) 770 continue; 771 772 for_each_element(sub, elem->data + 1, elem->datalen - 1) { 773 u8 new_bssid[ETH_ALEN]; 774 const u8 *index; 775 776 if (sub->id != 0 || sub->datalen < 4) { 777 /* not a valid BSS profile */ 778 continue; 779 } 780 781 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP || 782 sub->data[1] != 2) { 783 /* The first element of the 784 * Nontransmitted BSSID Profile is not 785 * the Nontransmitted BSSID Capability 786 * element. 787 */ 788 continue; 789 } 790 791 memset(nontransmitted_profile, 0, len); 792 profile_len = cfg80211_merge_profile(start, len, 793 elem, 794 sub, 795 nontransmitted_profile, 796 len); 797 798 /* found a Nontransmitted BSSID Profile */ 799 index = cfg80211_find_ie(WLAN_EID_MULTI_BSSID_IDX, 800 nontransmitted_profile, 801 profile_len); 802 if (!index || index[1] < 1 || index[2] == 0) { 803 /* Invalid MBSSID Index element */ 804 continue; 805 } 806 807 cfg80211_gen_new_bssid(bss->transmitted_bss->bssid, 808 elem->data[0], 809 index[2], 810 new_bssid); 811 if (ether_addr_equal(new_bssid, bss->bssid)) { 812 found = true; 813 elems->bssid_index_len = index[1]; 814 elems->bssid_index = (void *)&index[2]; 815 break; 816 } 817 } 818 } 819 820 return found ? profile_len : 0; 821 } 822 823 static void 824 ieee80211_mle_get_sta_prof(struct ieee80211_elems_parse *elems_parse, 825 u8 link_id) 826 { 827 struct ieee802_11_elems *elems = &elems_parse->elems; 828 const struct ieee80211_multi_link_elem *ml = elems->ml_basic; 829 ssize_t ml_len = elems->ml_basic_len; 830 const struct element *sub; 831 832 for_each_mle_subelement(sub, (u8 *)ml, ml_len) { 833 struct ieee80211_mle_per_sta_profile *prof = (void *)sub->data; 834 ssize_t sta_prof_len; 835 u16 control; 836 837 if (sub->id != IEEE80211_MLE_SUBELEM_PER_STA_PROFILE) 838 continue; 839 840 if (!ieee80211_mle_basic_sta_prof_size_ok(sub->data, 841 sub->datalen)) 842 return; 843 844 control = le16_to_cpu(prof->control); 845 846 if (link_id != u16_get_bits(control, 847 IEEE80211_MLE_STA_CONTROL_LINK_ID)) 848 continue; 849 850 if (!(control & IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE)) 851 return; 852 853 /* the sub element can be fragmented */ 854 sta_prof_len = 855 cfg80211_defragment_element(sub, 856 (u8 *)ml, ml_len, 857 elems_parse->scratch_pos, 858 elems_parse->scratch + 859 elems_parse->scratch_len - 860 elems_parse->scratch_pos, 861 IEEE80211_MLE_SUBELEM_FRAGMENT); 862 863 if (sta_prof_len < 0) 864 return; 865 866 elems->prof = (void *)elems_parse->scratch_pos; 867 elems->sta_prof_len = sta_prof_len; 868 elems_parse->scratch_pos += sta_prof_len; 869 870 return; 871 } 872 } 873 874 static const struct element * 875 ieee80211_prep_mle_link_parse(struct ieee80211_elems_parse *elems_parse, 876 struct ieee80211_elems_parse_params *params, 877 struct ieee80211_elems_parse_params *sub) 878 { 879 struct ieee802_11_elems *elems = &elems_parse->elems; 880 struct ieee80211_mle_per_sta_profile *prof; 881 const struct element *tmp; 882 ssize_t ml_len; 883 const u8 *end; 884 885 if (params->mode < IEEE80211_CONN_MODE_EHT) 886 return NULL; 887 888 for_each_element_extid(tmp, WLAN_EID_EXT_EHT_MULTI_LINK, 889 elems->ie_start, elems->total_len) { 890 const struct ieee80211_multi_link_elem *mle = 891 (void *)tmp->data + 1; 892 893 if (!ieee80211_mle_size_ok(tmp->data + 1, tmp->datalen - 1)) 894 continue; 895 896 if (le16_get_bits(mle->control, IEEE80211_ML_CONTROL_TYPE) != 897 IEEE80211_ML_CONTROL_TYPE_BASIC) 898 continue; 899 900 elems_parse->ml_basic_elem = tmp; 901 break; 902 } 903 904 ml_len = cfg80211_defragment_element(elems_parse->ml_basic_elem, 905 elems->ie_start, 906 elems->total_len, 907 elems_parse->scratch_pos, 908 elems_parse->scratch + 909 elems_parse->scratch_len - 910 elems_parse->scratch_pos, 911 WLAN_EID_FRAGMENT); 912 913 if (ml_len < 0) 914 return NULL; 915 916 elems->ml_basic = (const void *)elems_parse->scratch_pos; 917 elems->ml_basic_len = ml_len; 918 elems_parse->scratch_pos += ml_len; 919 920 if (params->link_id == -1) 921 return NULL; 922 923 ieee80211_mle_get_sta_prof(elems_parse, params->link_id); 924 prof = elems->prof; 925 926 if (!prof) 927 return NULL; 928 929 /* check if we have the 4 bytes for the fixed part in assoc response */ 930 if (elems->sta_prof_len < sizeof(*prof) + prof->sta_info_len - 1 + 4) { 931 elems->prof = NULL; 932 elems->sta_prof_len = 0; 933 return NULL; 934 } 935 936 /* 937 * Skip the capability information and the status code that are expected 938 * as part of the station profile in association response frames. Note 939 * the -1 is because the 'sta_info_len' is accounted to as part of the 940 * per-STA profile, but not part of the 'u8 variable[]' portion. 941 */ 942 sub->start = prof->variable + prof->sta_info_len - 1 + 4; 943 end = (const u8 *)prof + elems->sta_prof_len; 944 sub->len = end - sub->start; 945 946 sub->mode = params->mode; 947 sub->action = params->action; 948 sub->from_ap = params->from_ap; 949 sub->link_id = -1; 950 951 return cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE, 952 sub->start, sub->len); 953 } 954 955 static void 956 ieee80211_mle_defrag_reconf(struct ieee80211_elems_parse *elems_parse) 957 { 958 struct ieee802_11_elems *elems = &elems_parse->elems; 959 ssize_t ml_len; 960 961 ml_len = cfg80211_defragment_element(elems_parse->ml_reconf_elem, 962 elems->ie_start, 963 elems->total_len, 964 elems_parse->scratch_pos, 965 elems_parse->scratch + 966 elems_parse->scratch_len - 967 elems_parse->scratch_pos, 968 WLAN_EID_FRAGMENT); 969 if (ml_len < 0) 970 return; 971 elems->ml_reconf = (void *)elems_parse->scratch_pos; 972 elems->ml_reconf_len = ml_len; 973 elems_parse->scratch_pos += ml_len; 974 } 975 976 static void 977 ieee80211_mle_defrag_epcs(struct ieee80211_elems_parse *elems_parse) 978 { 979 struct ieee802_11_elems *elems = &elems_parse->elems; 980 ssize_t ml_len; 981 982 ml_len = cfg80211_defragment_element(elems_parse->ml_epcs_elem, 983 elems->ie_start, 984 elems->total_len, 985 elems_parse->scratch_pos, 986 elems_parse->scratch + 987 elems_parse->scratch_len - 988 elems_parse->scratch_pos, 989 WLAN_EID_FRAGMENT); 990 if (ml_len < 0) 991 return; 992 elems->ml_epcs = (void *)elems_parse->scratch_pos; 993 elems->ml_epcs_len = ml_len; 994 elems_parse->scratch_pos += ml_len; 995 } 996 997 struct ieee802_11_elems * 998 ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params) 999 { 1000 struct ieee80211_elems_parse_params sub = {}; 1001 struct ieee80211_elems_parse *elems_parse; 1002 const struct element *non_inherit = NULL; 1003 struct ieee802_11_elems *elems; 1004 size_t scratch_len = 3 * params->len; 1005 bool multi_link_inner = false; 1006 1007 BUILD_BUG_ON(offsetof(typeof(*elems_parse), elems) != 0); 1008 1009 /* cannot parse for both a specific link and non-transmitted BSS */ 1010 if (WARN_ON(params->link_id >= 0 && params->bss)) 1011 return NULL; 1012 1013 elems_parse = kzalloc(struct_size(elems_parse, scratch, scratch_len), 1014 GFP_ATOMIC); 1015 if (!elems_parse) 1016 return NULL; 1017 1018 elems_parse->scratch_len = scratch_len; 1019 elems_parse->scratch_pos = elems_parse->scratch; 1020 1021 elems = &elems_parse->elems; 1022 elems->ie_start = params->start; 1023 elems->total_len = params->len; 1024 1025 /* set all TPE entries to unlimited (but invalid) */ 1026 ieee80211_clear_tpe(&elems->tpe); 1027 ieee80211_clear_tpe(&elems->csa_tpe); 1028 1029 /* 1030 * If we're looking for a non-transmitted BSS then we cannot at 1031 * the same time be looking for a second link as the two can only 1032 * appear in the same frame carrying info for different BSSes. 1033 * 1034 * In any case, we only look for one at a time, as encoded by 1035 * the WARN_ON above. 1036 */ 1037 if (params->bss) { 1038 int nontx_len = 1039 ieee802_11_find_bssid_profile(params->start, 1040 params->len, 1041 elems, params->bss, 1042 elems_parse->scratch_pos); 1043 sub.start = elems_parse->scratch_pos; 1044 sub.mode = params->mode; 1045 sub.len = nontx_len; 1046 sub.action = params->action; 1047 sub.link_id = params->link_id; 1048 1049 /* consume the space used for non-transmitted profile */ 1050 elems_parse->scratch_pos += nontx_len; 1051 1052 non_inherit = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE, 1053 sub.start, nontx_len); 1054 } else { 1055 /* must always parse to get elems_parse->ml_basic_elem */ 1056 non_inherit = ieee80211_prep_mle_link_parse(elems_parse, params, 1057 &sub); 1058 multi_link_inner = true; 1059 } 1060 1061 elems_parse->skip_vendor = 1062 cfg80211_find_elem(WLAN_EID_VENDOR_SPECIFIC, 1063 sub.start, sub.len); 1064 elems->crc = _ieee802_11_parse_elems_full(params, elems_parse, 1065 non_inherit); 1066 1067 /* Override with nontransmitted/per-STA profile if found */ 1068 if (sub.len) { 1069 elems_parse->multi_link_inner = multi_link_inner; 1070 elems_parse->skip_vendor = false; 1071 _ieee802_11_parse_elems_full(&sub, elems_parse, NULL); 1072 } 1073 1074 ieee80211_mle_defrag_reconf(elems_parse); 1075 1076 ieee80211_mle_defrag_epcs(elems_parse); 1077 1078 if (elems->tim && !elems->parse_error) { 1079 const struct ieee80211_tim_ie *tim_ie = elems->tim; 1080 1081 elems->dtim_period = tim_ie->dtim_period; 1082 elems->dtim_count = tim_ie->dtim_count; 1083 } 1084 1085 /* Override DTIM period and count if needed */ 1086 if (elems->bssid_index && 1087 elems->bssid_index_len >= 1088 offsetofend(struct ieee80211_bssid_index, dtim_period)) 1089 elems->dtim_period = elems->bssid_index->dtim_period; 1090 1091 if (elems->bssid_index && 1092 elems->bssid_index_len >= 1093 offsetofend(struct ieee80211_bssid_index, dtim_count)) 1094 elems->dtim_count = elems->bssid_index->dtim_count; 1095 1096 return elems; 1097 } 1098 EXPORT_SYMBOL_IF_KUNIT(ieee802_11_parse_elems_full); 1099 1100 int ieee80211_parse_bitrates(enum nl80211_chan_width width, 1101 const struct ieee80211_supported_band *sband, 1102 const u8 *srates, int srates_len, u32 *rates) 1103 { 1104 u32 rate_flags = ieee80211_chanwidth_rate_flags(width); 1105 struct ieee80211_rate *br; 1106 int brate, rate, i, j, count = 0; 1107 1108 *rates = 0; 1109 1110 for (i = 0; i < srates_len; i++) { 1111 rate = srates[i] & 0x7f; 1112 1113 for (j = 0; j < sband->n_bitrates; j++) { 1114 br = &sband->bitrates[j]; 1115 if ((rate_flags & br->flags) != rate_flags) 1116 continue; 1117 1118 brate = DIV_ROUND_UP(br->bitrate, 5); 1119 if (brate == rate) { 1120 *rates |= BIT(j); 1121 count++; 1122 break; 1123 } 1124 } 1125 } 1126 return count; 1127 } 1128