net/mac80211/parse.c

   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 <[email protected]>
   6  * Copyright 2007       Johannes Berg <[email protected]>
   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         /*
  48          * scratch buffer that can be used for various element parsing related
  49          * tasks, e.g., element de-fragmentation etc.
  50          */
  51         size_t scratch_len;
  52         u8 *scratch_pos;
  53         u8 scratch[] __counted_by(scratch_len);
  54 };
  55
  56 static void
  57 ieee80211_parse_extension_element(u32 *crc,
  58                                   const struct element *elem,
  59                                   struct ieee80211_elems_parse *elems_parse,
  60                                   struct ieee80211_elems_parse_params *params)
  61 {
  62         struct ieee802_11_elems *elems = &elems_parse->elems;
  63         const void *data = elem->data + 1;
  64         bool calc_crc = false;
  65         u8 len;
  66
  67         if (!elem->datalen)
  68                 return;
  69
  70         len = elem->datalen - 1;
  71
  72         switch (elem->data[0]) {
  73         case WLAN_EID_EXT_HE_MU_EDCA:
  74                 if (params->mode < IEEE80211_CONN_MODE_HE)
  75                         break;
  76                 calc_crc = true;
  77                 if (len >= sizeof(*elems->mu_edca_param_set))
  78                         elems->mu_edca_param_set = data;
  79                 break;
  80         case WLAN_EID_EXT_HE_CAPABILITY:
  81                 if (params->mode < IEEE80211_CONN_MODE_HE)
  82                         break;
  83                 if (ieee80211_he_capa_size_ok(data, len)) {
  84                         elems->he_cap = data;
  85                         elems->he_cap_len = len;
  86                 }
  87                 break;
  88         case WLAN_EID_EXT_HE_OPERATION:
  89                 if (params->mode < IEEE80211_CONN_MODE_HE)
  90                         break;
  91                 calc_crc = true;
  92                 if (len >= sizeof(*elems->he_operation) &&
  93                     len >= ieee80211_he_oper_size(data) - 1)
  94                         elems->he_operation = data;
  95                 break;
  96         case WLAN_EID_EXT_UORA:
  97                 if (params->mode < IEEE80211_CONN_MODE_HE)
  98                         break;
  99                 if (len >= 1)
 100                         elems->uora_element = data;
 101                 break;
 102         case WLAN_EID_EXT_MAX_CHANNEL_SWITCH_TIME:
 103                 if (len == 3)
 104                         elems->max_channel_switch_time = data;
 105                 break;
 106         case WLAN_EID_EXT_MULTIPLE_BSSID_CONFIGURATION:
 107                 if (len >= sizeof(*elems->mbssid_config_ie))
 108                         elems->mbssid_config_ie = data;
 109                 break;
 110         case WLAN_EID_EXT_HE_SPR:
 111                 if (params->mode < IEEE80211_CONN_MODE_HE)
 112                         break;
 113                 if (len >= sizeof(*elems->he_spr) &&
 114                     len >= ieee80211_he_spr_size(data))
 115                         elems->he_spr = data;
 116                 break;
 117         case WLAN_EID_EXT_HE_6GHZ_CAPA:
 118                 if (params->mode < IEEE80211_CONN_MODE_HE)
 119                         break;
 120                 if (len >= sizeof(*elems->he_6ghz_capa))
 121                         elems->he_6ghz_capa = data;
 122                 break;
 123         case WLAN_EID_EXT_EHT_CAPABILITY:
 124                 if (params->mode < IEEE80211_CONN_MODE_EHT)
 125                         break;
 126                 if (ieee80211_eht_capa_size_ok(elems->he_cap,
 127                                                data, len,
 128                                                params->from_ap)) {
 129                         elems->eht_cap = data;
 130                         elems->eht_cap_len = len;
 131                 }
 132                 break;
 133         case WLAN_EID_EXT_EHT_OPERATION:
 134                 if (params->mode < IEEE80211_CONN_MODE_EHT)
 135                         break;
 136                 if (ieee80211_eht_oper_size_ok(data, len))
 137                         elems->eht_operation = data;
 138                 calc_crc = true;
 139                 break;
 140         case WLAN_EID_EXT_EHT_MULTI_LINK:
 141                 if (params->mode < IEEE80211_CONN_MODE_EHT)
 142                         break;
 143                 calc_crc = true;
 144
 145                 if (ieee80211_mle_size_ok(data, len)) {
 146                         const struct ieee80211_multi_link_elem *mle =
 147                                 (void *)data;
 148
 149                         switch (le16_get_bits(mle->control,
 150                                               IEEE80211_ML_CONTROL_TYPE)) {
 151                         case IEEE80211_ML_CONTROL_TYPE_BASIC:
 152                                 if (elems_parse->ml_basic_elem) {
 153                                         elems->parse_error |=
 154                                                 IEEE80211_PARSE_ERR_DUP_NEST_ML_BASIC;
 155                                         break;
 156                                 }
 157                                 elems_parse->ml_basic_elem = elem;
 158                                 break;
 159                         case IEEE80211_ML_CONTROL_TYPE_RECONF:
 160                                 elems_parse->ml_reconf_elem = elem;
 161                                 break;
 162                         default:
 163                                 break;
 164                         }
 165                 }
 166                 break;
 167         case WLAN_EID_EXT_BANDWIDTH_INDICATION:
 168                 if (params->mode < IEEE80211_CONN_MODE_EHT)
 169                         break;
 170                 if (ieee80211_bandwidth_indication_size_ok(data, len))
 171                         elems->bandwidth_indication = data;
 172                 calc_crc = true;
 173                 break;
 174         case WLAN_EID_EXT_TID_TO_LINK_MAPPING:
 175                 if (params->mode < IEEE80211_CONN_MODE_EHT)
 176                         break;
 177                 calc_crc = true;
 178                 if (ieee80211_tid_to_link_map_size_ok(data, len) &&
 179                     elems->ttlm_num < ARRAY_SIZE(elems->ttlm)) {
 180                         elems->ttlm[elems->ttlm_num] = (void *)data;
 181                         elems->ttlm_num++;
 182                 }
 183                 break;
 184         }
 185
 186         if (crc && calc_crc)
 187                 *crc = crc32_be(*crc, (void *)elem, elem->datalen + 2);
 188 }
 189
 190 static u32
 191 _ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params,
 192                              struct ieee80211_elems_parse *elems_parse,
 193                              const struct element *check_inherit)
 194 {
 195         struct ieee802_11_elems *elems = &elems_parse->elems;
 196         const struct element *elem;
 197         bool calc_crc = params->filter != 0;
 198         DECLARE_BITMAP(seen_elems, 256);
 199         u32 crc = params->crc;
 200
 201         bitmap_zero(seen_elems, 256);
 202
 203         for_each_element(elem, params->start, params->len) {
 204                 const struct element *subelem;
 205                 u8 elem_parse_failed;
 206                 u8 id = elem->id;
 207                 u8 elen = elem->datalen;
 208                 const u8 *pos = elem->data;
 209
 210                 if (check_inherit &&
 211                     !cfg80211_is_element_inherited(elem,
 212                                                    check_inherit))
 213                         continue;
 214
 215                 switch (id) {
 216                 case WLAN_EID_SSID:
 217                 case WLAN_EID_SUPP_RATES:
 218                 case WLAN_EID_FH_PARAMS:
 219                 case WLAN_EID_DS_PARAMS:
 220                 case WLAN_EID_CF_PARAMS:
 221                 case WLAN_EID_TIM:
 222                 case WLAN_EID_IBSS_PARAMS:
 223                 case WLAN_EID_CHALLENGE:
 224                 case WLAN_EID_RSN:
 225                 case WLAN_EID_ERP_INFO:
 226                 case WLAN_EID_EXT_SUPP_RATES:
 227                 case WLAN_EID_HT_CAPABILITY:
 228                 case WLAN_EID_HT_OPERATION:
 229                 case WLAN_EID_VHT_CAPABILITY:
 230                 case WLAN_EID_VHT_OPERATION:
 231                 case WLAN_EID_MESH_ID:
 232                 case WLAN_EID_MESH_CONFIG:
 233                 case WLAN_EID_PEER_MGMT:
 234                 case WLAN_EID_PREQ:
 235                 case WLAN_EID_PREP:
 236                 case WLAN_EID_PERR:
 237                 case WLAN_EID_RANN:
 238                 case WLAN_EID_CHANNEL_SWITCH:
 239                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 240                 case WLAN_EID_COUNTRY:
 241                 case WLAN_EID_PWR_CONSTRAINT:
 242                 case WLAN_EID_TIMEOUT_INTERVAL:
 243                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 244                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 245                 case WLAN_EID_CHAN_SWITCH_PARAM:
 246                 case WLAN_EID_EXT_CAPABILITY:
 247                 case WLAN_EID_CHAN_SWITCH_TIMING:
 248                 case WLAN_EID_LINK_ID:
 249                 case WLAN_EID_BSS_MAX_IDLE_PERIOD:
 250                 case WLAN_EID_RSNX:
 251                 case WLAN_EID_S1G_BCN_COMPAT:
 252                 case WLAN_EID_S1G_CAPABILITIES:
 253                 case WLAN_EID_S1G_OPERATION:
 254                 case WLAN_EID_AID_RESPONSE:
 255                 case WLAN_EID_S1G_SHORT_BCN_INTERVAL:
 256                 /*
 257                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
 258                  * that if the content gets bigger it might be needed more than once
 259                  */
 260                         if (test_bit(id, seen_elems)) {
 261                                 elems->parse_error |=
 262                                         IEEE80211_PARSE_ERR_DUP_ELEM;
 263                                 continue;
 264                         }
 265                         break;
 266                 }
 267
 268                 if (calc_crc && id < 64 && (params->filter & (1ULL << id)))
 269                         crc = crc32_be(crc, pos - 2, elen + 2);
 270
 271                 elem_parse_failed = 0;
 272
 273                 switch (id) {
 274                 case WLAN_EID_LINK_ID:
 275                         if (elen + 2 < sizeof(struct ieee80211_tdls_lnkie)) {
 276                                 elem_parse_failed =
 277                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 278                                 break;
 279                         }
 280                         elems->lnk_id = (void *)(pos - 2);
 281                         break;
 282                 case WLAN_EID_CHAN_SWITCH_TIMING:
 283                         if (elen < sizeof(struct ieee80211_ch_switch_timing)) {
 284                                 elem_parse_failed =
 285                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 286                                 break;
 287                         }
 288                         elems->ch_sw_timing = (void *)pos;
 289                         break;
 290                 case WLAN_EID_EXT_CAPABILITY:
 291                         elems->ext_capab = pos;
 292                         elems->ext_capab_len = elen;
 293                         break;
 294                 case WLAN_EID_SSID:
 295                         elems->ssid = pos;
 296                         elems->ssid_len = elen;
 297                         break;
 298                 case WLAN_EID_SUPP_RATES:
 299                         elems->supp_rates = pos;
 300                         elems->supp_rates_len = elen;
 301                         break;
 302                 case WLAN_EID_DS_PARAMS:
 303                         if (elen >= 1)
 304                                 elems->ds_params = pos;
 305                         else
 306                                 elem_parse_failed =
 307                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 308                         break;
 309                 case WLAN_EID_TIM:
 310                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
 311                                 elems->tim = (void *)pos;
 312                                 elems->tim_len = elen;
 313                         } else
 314                                 elem_parse_failed =
 315                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 316                         break;
 317                 case WLAN_EID_VENDOR_SPECIFIC:
 318                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 319                             pos[2] == 0xf2) {
 320                                 /* Microsoft OUI (00:50:F2) */
 321
 322                                 if (calc_crc)
 323                                         crc = crc32_be(crc, pos - 2, elen + 2);
 324
 325                                 if (elen >= 5 && pos[3] == 2) {
 326                                         /* OUI Type 2 - WMM IE */
 327                                         if (pos[4] == 0) {
 328                                                 elems->wmm_info = pos;
 329                                                 elems->wmm_info_len = elen;
 330                                         } else if (pos[4] == 1) {
 331                                                 elems->wmm_param = pos;
 332                                                 elems->wmm_param_len = elen;
 333                                         }
 334                                 }
 335                         }
 336                         break;
 337                 case WLAN_EID_RSN:
 338                         elems->rsn = pos;
 339                         elems->rsn_len = elen;
 340                         break;
 341                 case WLAN_EID_ERP_INFO:
 342                         if (elen >= 1)
 343                                 elems->erp_info = pos;
 344                         else
 345                                 elem_parse_failed =
 346                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 347                         break;
 348                 case WLAN_EID_EXT_SUPP_RATES:
 349                         elems->ext_supp_rates = pos;
 350                         elems->ext_supp_rates_len = elen;
 351                         break;
 352                 case WLAN_EID_HT_CAPABILITY:
 353                         if (params->mode < IEEE80211_CONN_MODE_HT)
 354                                 break;
 355                         if (elen >= sizeof(struct ieee80211_ht_cap))
 356                                 elems->ht_cap_elem = (void *)pos;
 357                         else
 358                                 elem_parse_failed =
 359                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 360                         break;
 361                 case WLAN_EID_HT_OPERATION:
 362                         if (params->mode < IEEE80211_CONN_MODE_HT)
 363                                 break;
 364                         if (elen >= sizeof(struct ieee80211_ht_operation))
 365                                 elems->ht_operation = (void *)pos;
 366                         else
 367                                 elem_parse_failed =
 368                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 369                         break;
 370                 case WLAN_EID_VHT_CAPABILITY:
 371                         if (params->mode < IEEE80211_CONN_MODE_VHT)
 372                                 break;
 373                         if (elen >= sizeof(struct ieee80211_vht_cap))
 374                                 elems->vht_cap_elem = (void *)pos;
 375                         else
 376                                 elem_parse_failed =
 377                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 378                         break;
 379                 case WLAN_EID_VHT_OPERATION:
 380                         if (params->mode < IEEE80211_CONN_MODE_VHT)
 381                                 break;
 382                         if (elen >= sizeof(struct ieee80211_vht_operation)) {
 383                                 elems->vht_operation = (void *)pos;
 384                                 if (calc_crc)
 385                                         crc = crc32_be(crc, pos - 2, elen + 2);
 386                                 break;
 387                         }
 388                         elem_parse_failed =
 389                                 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 390                         break;
 391                 case WLAN_EID_OPMODE_NOTIF:
 392                         if (params->mode < IEEE80211_CONN_MODE_VHT)
 393                                 break;
 394                         if (elen > 0) {
 395                                 elems->opmode_notif = pos;
 396                                 if (calc_crc)
 397                                         crc = crc32_be(crc, pos - 2, elen + 2);
 398                                 break;
 399                         }
 400                         elem_parse_failed =
 401                                 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 402                         break;
 403                 case WLAN_EID_MESH_ID:
 404                         elems->mesh_id = pos;
 405                         elems->mesh_id_len = elen;
 406                         break;
 407                 case WLAN_EID_MESH_CONFIG:
 408                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
 409                                 elems->mesh_config = (void *)pos;
 410                         else
 411                                 elem_parse_failed =
 412                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 413                         break;
 414                 case WLAN_EID_PEER_MGMT:
 415                         elems->peering = pos;
 416                         elems->peering_len = elen;
 417                         break;
 418                 case WLAN_EID_MESH_AWAKE_WINDOW:
 419                         if (elen >= 2)
 420                                 elems->awake_window = (void *)pos;
 421                         break;
 422                 case WLAN_EID_PREQ:
 423                         elems->preq = pos;
 424                         elems->preq_len = elen;
 425                         break;
 426                 case WLAN_EID_PREP:
 427                         elems->prep = pos;
 428                         elems->prep_len = elen;
 429                         break;
 430                 case WLAN_EID_PERR:
 431                         elems->perr = pos;
 432                         elems->perr_len = elen;
 433                         break;
 434                 case WLAN_EID_RANN:
 435                         if (elen >= sizeof(struct ieee80211_rann_ie))
 436                                 elems->rann = (void *)pos;
 437                         else
 438                                 elem_parse_failed =
 439                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 440                         break;
 441                 case WLAN_EID_CHANNEL_SWITCH:
 442                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
 443                                 elem_parse_failed =
 444                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 445                                 break;
 446                         }
 447                         elems->ch_switch_ie = (void *)pos;
 448                         break;
 449                 case WLAN_EID_EXT_CHANSWITCH_ANN:
 450                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
 451                                 elem_parse_failed =
 452                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 453                                 break;
 454                         }
 455                         elems->ext_chansw_ie = (void *)pos;
 456                         break;
 457                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
 458                         if (params->mode < IEEE80211_CONN_MODE_HT)
 459                                 break;
 460                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
 461                                 elem_parse_failed =
 462                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 463                                 break;
 464                         }
 465                         elems->sec_chan_offs = (void *)pos;
 466                         break;
 467                 case WLAN_EID_CHAN_SWITCH_PARAM:
 468                         if (elen <
 469                             sizeof(*elems->mesh_chansw_params_ie)) {
 470                                 elem_parse_failed =
 471                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 472                                 break;
 473                         }
 474                         elems->mesh_chansw_params_ie = (void *)pos;
 475                         break;
 476                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
 477                         if (params->mode < IEEE80211_CONN_MODE_VHT)
 478                                 break;
 479
 480                         if (!params->action) {
 481                                 elem_parse_failed =
 482                                         IEEE80211_PARSE_ERR_UNEXPECTED_ELEM;
 483                                 break;
 484                         }
 485
 486                         if (elen < sizeof(*elems->wide_bw_chansw_ie)) {
 487                                 elem_parse_failed =
 488                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 489                                 break;
 490                         }
 491                         elems->wide_bw_chansw_ie = (void *)pos;
 492                         break;
 493                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
 494                         if (params->mode < IEEE80211_CONN_MODE_VHT)
 495                                 break;
 496                         if (params->action) {
 497                                 elem_parse_failed =
 498                                         IEEE80211_PARSE_ERR_UNEXPECTED_ELEM;
 499                                 break;
 500                         }
 501                         /*
 502                          * This is a bit tricky, but as we only care about
 503                          * a few elements, parse them out manually.
 504                          */
 505                         subelem = cfg80211_find_elem(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
 506                                                      pos, elen);
 507                         if (subelem) {
 508                                 if (subelem->datalen >= sizeof(*elems->wide_bw_chansw_ie))
 509                                         elems->wide_bw_chansw_ie =
 510                                                 (void *)subelem->data;
 511                                 else
 512                                         elem_parse_failed =
 513                                                 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 514                         }
 515
 516                         if (params->mode < IEEE80211_CONN_MODE_EHT)
 517                                 break;
 518
 519                         subelem = cfg80211_find_ext_elem(WLAN_EID_EXT_BANDWIDTH_INDICATION,
 520                                                          pos, elen);
 521                         if (subelem) {
 522                                 const void *edata = subelem->data + 1;
 523                                 u8 edatalen = subelem->datalen - 1;
 524
 525                                 if (ieee80211_bandwidth_indication_size_ok(edata,
 526                                                                            edatalen))
 527                                         elems->bandwidth_indication = edata;
 528                                 else
 529                                         elem_parse_failed =
 530                                                 IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 531                         }
 532                         break;
 533                 case WLAN_EID_COUNTRY:
 534                         elems->country_elem = pos;
 535                         elems->country_elem_len = elen;
 536                         break;
 537                 case WLAN_EID_PWR_CONSTRAINT:
 538                         if (elen != 1) {
 539                                 elem_parse_failed =
 540                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 541                                 break;
 542                         }
 543                         elems->pwr_constr_elem = pos;
 544                         break;
 545                 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
 546                         /* Lots of different options exist, but we only care
 547                          * about the Dynamic Transmit Power Control element.
 548                          * First check for the Cisco OUI, then for the DTPC
 549                          * tag (0x00).
 550                          */
 551                         if (elen < 4) {
 552                                 elem_parse_failed =
 553                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 554                                 break;
 555                         }
 556
 557                         if (pos[0] != 0x00 || pos[1] != 0x40 ||
 558                             pos[2] != 0x96 || pos[3] != 0x00)
 559                                 break;
 560
 561                         if (elen != 6) {
 562                                 elem_parse_failed =
 563                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 564                                 break;
 565                         }
 566
 567                         if (calc_crc)
 568                                 crc = crc32_be(crc, pos - 2, elen + 2);
 569
 570                         elems->cisco_dtpc_elem = pos;
 571                         break;
 572                 case WLAN_EID_ADDBA_EXT:
 573                         if (elen < sizeof(struct ieee80211_addba_ext_ie)) {
 574                                 elem_parse_failed =
 575                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 576                                 break;
 577                         }
 578                         elems->addba_ext_ie = (void *)pos;
 579                         break;
 580                 case WLAN_EID_TIMEOUT_INTERVAL:
 581                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
 582                                 elems->timeout_int = (void *)pos;
 583                         else
 584                                 elem_parse_failed =
 585                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 586                         break;
 587                 case WLAN_EID_BSS_MAX_IDLE_PERIOD:
 588                         if (elen >= sizeof(*elems->max_idle_period_ie))
 589                                 elems->max_idle_period_ie = (void *)pos;
 590                         break;
 591                 case WLAN_EID_RSNX:
 592                         elems->rsnx = pos;
 593                         elems->rsnx_len = elen;
 594                         break;
 595                 case WLAN_EID_TX_POWER_ENVELOPE:
 596                         if (elen < 1 ||
 597                             elen > sizeof(struct ieee80211_tx_pwr_env))
 598                                 break;
 599
 600                         if (elems->tx_pwr_env_num >= ARRAY_SIZE(elems->tx_pwr_env))
 601                                 break;
 602
 603                         elems->tx_pwr_env[elems->tx_pwr_env_num] = (void *)pos;
 604                         elems->tx_pwr_env_len[elems->tx_pwr_env_num] = elen;
 605                         elems->tx_pwr_env_num++;
 606                         break;
 607                 case WLAN_EID_EXTENSION:
 608                         ieee80211_parse_extension_element(calc_crc ?
 609                                                                 &crc : NULL,
 610                                                           elem, elems_parse,
 611                                                           params);
 612                         break;
 613                 case WLAN_EID_S1G_CAPABILITIES:
 614                         if (params->mode != IEEE80211_CONN_MODE_S1G)
 615                                 break;
 616                         if (elen >= sizeof(*elems->s1g_capab))
 617                                 elems->s1g_capab = (void *)pos;
 618                         else
 619                                 elem_parse_failed =
 620                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 621                         break;
 622                 case WLAN_EID_S1G_OPERATION:
 623                         if (params->mode != IEEE80211_CONN_MODE_S1G)
 624                                 break;
 625                         if (elen == sizeof(*elems->s1g_oper))
 626                                 elems->s1g_oper = (void *)pos;
 627                         else
 628                                 elem_parse_failed =
 629                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 630                         break;
 631                 case WLAN_EID_S1G_BCN_COMPAT:
 632                         if (params->mode != IEEE80211_CONN_MODE_S1G)
 633                                 break;
 634                         if (elen == sizeof(*elems->s1g_bcn_compat))
 635                                 elems->s1g_bcn_compat = (void *)pos;
 636                         else
 637                                 elem_parse_failed =
 638                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 639                         break;
 640                 case WLAN_EID_AID_RESPONSE:
 641                         if (params->mode != IEEE80211_CONN_MODE_S1G)
 642                                 break;
 643                         if (elen == sizeof(struct ieee80211_aid_response_ie))
 644                                 elems->aid_resp = (void *)pos;
 645                         else
 646                                 elem_parse_failed =
 647                                         IEEE80211_PARSE_ERR_BAD_ELEM_SIZE;
 648                         break;
 649                 default:
 650                         break;
 651                 }
 652
 653                 if (elem_parse_failed)
 654                         elems->parse_error |= elem_parse_failed;
 655                 else
 656                         __set_bit(id, seen_elems);
 657         }
 658
 659         if (!for_each_element_completed(elem, params->start, params->len))
 660                 elems->parse_error |= IEEE80211_PARSE_ERR_INVALID_END;
 661
 662         return crc;
 663 }
 664
 665 static size_t ieee802_11_find_bssid_profile(const u8 *start, size_t len,
 666                                             struct ieee802_11_elems *elems,
 667                                             struct cfg80211_bss *bss,
 668                                             u8 *nontransmitted_profile)
 669 {
 670         const struct element *elem, *sub;
 671         size_t profile_len = 0;
 672         bool found = false;
 673
 674         if (!bss || !bss->transmitted_bss)
 675                 return profile_len;
 676
 677         for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, start, len) {
 678                 if (elem->datalen < 2)
 679                         continue;
 680                 if (elem->data[0] < 1 || elem->data[0] > 8)
 681                         continue;
 682
 683                 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
 684                         u8 new_bssid[ETH_ALEN];
 685                         const u8 *index;
 686
 687                         if (sub->id != 0 || sub->datalen < 4) {
 688                                 /* not a valid BSS profile */
 689                                 continue;
 690                         }
 691
 692                         if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
 693                             sub->data[1] != 2) {
 694                                 /* The first element of the
 695                                  * Nontransmitted BSSID Profile is not
 696                                  * the Nontransmitted BSSID Capability
 697                                  * element.
 698                                  */
 699                                 continue;
 700                         }
 701
 702                         memset(nontransmitted_profile, 0, len);
 703                         profile_len = cfg80211_merge_profile(start, len,
 704                                                              elem,
 705                                                              sub,
 706                                                              nontransmitted_profile,
 707                                                              len);
 708
 709                         /* found a Nontransmitted BSSID Profile */
 710                         index = cfg80211_find_ie(WLAN_EID_MULTI_BSSID_IDX,
 711                                                  nontransmitted_profile,
 712                                                  profile_len);
 713                         if (!index || index[1] < 1 || index[2] == 0) {
 714                                 /* Invalid MBSSID Index element */
 715                                 continue;
 716                         }
 717
 718                         cfg80211_gen_new_bssid(bss->transmitted_bss->bssid,
 719                                                elem->data[0],
 720                                                index[2],
 721                                                new_bssid);
 722                         if (ether_addr_equal(new_bssid, bss->bssid)) {
 723                                 found = true;
 724                                 elems->bssid_index_len = index[1];
 725                                 elems->bssid_index = (void *)&index[2];
 726                                 break;
 727                         }
 728                 }
 729         }
 730
 731         return found ? profile_len : 0;
 732 }
 733
 734 static void
 735 ieee80211_mle_get_sta_prof(struct ieee80211_elems_parse *elems_parse,
 736                            u8 link_id)
 737 {
 738         struct ieee802_11_elems *elems = &elems_parse->elems;
 739         const struct ieee80211_multi_link_elem *ml = elems->ml_basic;
 740         ssize_t ml_len = elems->ml_basic_len;
 741         const struct element *sub;
 742
 743         for_each_mle_subelement(sub, (u8 *)ml, ml_len) {
 744                 struct ieee80211_mle_per_sta_profile *prof = (void *)sub->data;
 745                 ssize_t sta_prof_len;
 746                 u16 control;
 747
 748                 if (sub->id != IEEE80211_MLE_SUBELEM_PER_STA_PROFILE)
 749                         continue;
 750
 751                 if (!ieee80211_mle_basic_sta_prof_size_ok(sub->data,
 752                                                           sub->datalen))
 753                         return;
 754
 755                 control = le16_to_cpu(prof->control);
 756
 757                 if (link_id != u16_get_bits(control,
 758                                             IEEE80211_MLE_STA_CONTROL_LINK_ID))
 759                         continue;
 760
 761                 if (!(control & IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE))
 762                         return;
 763
 764                 /* the sub element can be fragmented */
 765                 sta_prof_len =
 766                         cfg80211_defragment_element(sub,
 767                                                     (u8 *)ml, ml_len,
 768                                                     elems_parse->scratch_pos,
 769                                                     elems_parse->scratch +
 770                                                         elems_parse->scratch_len -
 771                                                         elems_parse->scratch_pos,
 772                                                     IEEE80211_MLE_SUBELEM_FRAGMENT);
 773
 774                 if (sta_prof_len < 0)
 775                         return;
 776
 777                 elems->prof = (void *)elems_parse->scratch_pos;
 778                 elems->sta_prof_len = sta_prof_len;
 779                 elems_parse->scratch_pos += sta_prof_len;
 780
 781                 return;
 782         }
 783 }
 784
 785 static void ieee80211_mle_parse_link(struct ieee80211_elems_parse *elems_parse,
 786                                      struct ieee80211_elems_parse_params *params)
 787 {
 788         struct ieee802_11_elems *elems = &elems_parse->elems;
 789         struct ieee80211_mle_per_sta_profile *prof;
 790         struct ieee80211_elems_parse_params sub = {
 791                 .mode = params->mode,
 792                 .action = params->action,
 793                 .from_ap = params->from_ap,
 794                 .link_id = -1,
 795         };
 796         ssize_t ml_len = elems->ml_basic_len;
 797         const struct element *non_inherit = NULL;
 798         const u8 *end;
 799
 800         ml_len = cfg80211_defragment_element(elems_parse->ml_basic_elem,
 801                                              elems->ie_start,
 802                                              elems->total_len,
 803                                              elems_parse->scratch_pos,
 804                                              elems_parse->scratch +
 805                                                 elems_parse->scratch_len -
 806                                                 elems_parse->scratch_pos,
 807                                              WLAN_EID_FRAGMENT);
 808
 809         if (ml_len < 0)
 810                 return;
 811
 812         elems->ml_basic = (const void *)elems_parse->scratch_pos;
 813         elems->ml_basic_len = ml_len;
 814         elems_parse->scratch_pos += ml_len;
 815
 816         if (params->link_id == -1)
 817                 return;
 818
 819         ieee80211_mle_get_sta_prof(elems_parse, params->link_id);
 820         prof = elems->prof;
 821
 822         if (!prof)
 823                 return;
 824
 825         /* check if we have the 4 bytes for the fixed part in assoc response */
 826         if (elems->sta_prof_len < sizeof(*prof) + prof->sta_info_len - 1 + 4) {
 827                 elems->prof = NULL;
 828                 elems->sta_prof_len = 0;
 829                 return;
 830         }
 831
 832         /*
 833          * Skip the capability information and the status code that are expected
 834          * as part of the station profile in association response frames. Note
 835          * the -1 is because the 'sta_info_len' is accounted to as part of the
 836          * per-STA profile, but not part of the 'u8 variable[]' portion.
 837          */
 838         sub.start = prof->variable + prof->sta_info_len - 1 + 4;
 839         end = (const u8 *)prof + elems->sta_prof_len;
 840         sub.len = end - sub.start;
 841
 842         non_inherit = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
 843                                              sub.start, sub.len);
 844         _ieee802_11_parse_elems_full(&sub, elems_parse, non_inherit);
 845 }
 846
 847 static void
 848 ieee80211_mle_defrag_reconf(struct ieee80211_elems_parse *elems_parse)
 849 {
 850         struct ieee802_11_elems *elems = &elems_parse->elems;
 851         ssize_t ml_len;
 852
 853         ml_len = cfg80211_defragment_element(elems_parse->ml_reconf_elem,
 854                                              elems->ie_start,
 855                                              elems->total_len,
 856                                              elems_parse->scratch_pos,
 857                                              elems_parse->scratch +
 858                                                 elems_parse->scratch_len -
 859                                                 elems_parse->scratch_pos,
 860                                              WLAN_EID_FRAGMENT);
 861         if (ml_len < 0)
 862                 return;
 863         elems->ml_reconf = (void *)elems_parse->scratch_pos;
 864         elems->ml_reconf_len = ml_len;
 865         elems_parse->scratch_pos += ml_len;
 866 }
 867
 868 struct ieee802_11_elems *
 869 ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params)
 870 {
 871         struct ieee80211_elems_parse *elems_parse;
 872         struct ieee802_11_elems *elems;
 873         const struct element *non_inherit = NULL;
 874         u8 *nontransmitted_profile;
 875         int nontransmitted_profile_len = 0;
 876         size_t scratch_len = 3 * params->len;
 877
 878         BUILD_BUG_ON(offsetof(typeof(*elems_parse), elems) != 0);
 879
 880         elems_parse = kzalloc(struct_size(elems_parse, scratch, scratch_len),
 881                               GFP_ATOMIC);
 882         if (!elems_parse)
 883                 return NULL;
 884
 885         elems_parse->scratch_len = scratch_len;
 886         elems_parse->scratch_pos = elems_parse->scratch;
 887
 888         elems = &elems_parse->elems;
 889         elems->ie_start = params->start;
 890         elems->total_len = params->len;
 891
 892         nontransmitted_profile = elems_parse->scratch_pos;
 893         nontransmitted_profile_len =
 894                 ieee802_11_find_bssid_profile(params->start, params->len,
 895                                               elems, params->bss,
 896                                               nontransmitted_profile);
 897         elems_parse->scratch_pos += nontransmitted_profile_len;
 898         non_inherit = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
 899                                              nontransmitted_profile,
 900                                              nontransmitted_profile_len);
 901
 902         elems->crc = _ieee802_11_parse_elems_full(params, elems_parse,
 903                                                   non_inherit);
 904
 905         /* Override with nontransmitted profile, if found */
 906         if (nontransmitted_profile_len) {
 907                 struct ieee80211_elems_parse_params sub = {
 908                         .mode = params->mode,
 909                         .start = nontransmitted_profile,
 910                         .len = nontransmitted_profile_len,
 911                         .action = params->action,
 912                         .link_id = params->link_id,
 913                 };
 914
 915                 _ieee802_11_parse_elems_full(&sub, elems_parse, NULL);
 916         }
 917
 918         ieee80211_mle_parse_link(elems_parse, params);
 919
 920         ieee80211_mle_defrag_reconf(elems_parse);
 921
 922         if (elems->tim && !elems->parse_error) {
 923                 const struct ieee80211_tim_ie *tim_ie = elems->tim;
 924
 925                 elems->dtim_period = tim_ie->dtim_period;
 926                 elems->dtim_count = tim_ie->dtim_count;
 927         }
 928
 929         /* Override DTIM period and count if needed */
 930         if (elems->bssid_index &&
 931             elems->bssid_index_len >=
 932             offsetofend(struct ieee80211_bssid_index, dtim_period))
 933                 elems->dtim_period = elems->bssid_index->dtim_period;
 934
 935         if (elems->bssid_index &&
 936             elems->bssid_index_len >=
 937             offsetofend(struct ieee80211_bssid_index, dtim_count))
 938                 elems->dtim_count = elems->bssid_index->dtim_count;
 939
 940         return elems;
 941 }
 942 EXPORT_SYMBOL_IF_KUNIT(ieee802_11_parse_elems_full);
 943
 944 int ieee80211_parse_bitrates(enum nl80211_chan_width width,
 945                              const struct ieee80211_supported_band *sband,
 946                              const u8 *srates, int srates_len, u32 *rates)
 947 {
 948         u32 rate_flags = ieee80211_chanwidth_rate_flags(width);
 949         struct ieee80211_rate *br;
 950         int brate, rate, i, j, count = 0;
 951
 952         *rates = 0;
 953
 954         for (i = 0; i < srates_len; i++) {
 955                 rate = srates[i] & 0x7f;
 956
 957                 for (j = 0; j < sband->n_bitrates; j++) {
 958                         br = &sband->bitrates[j];
 959                         if ((rate_flags & br->flags) != rate_flags)
 960                                 continue;
 961
 962                         brate = DIV_ROUND_UP(br->bitrate, 5);
 963                         if (brate == rate) {
 964                                 *rates |= BIT(j);
 965                                 count++;
 966                                 break;
 967                         }
 968                 }
 969         }
 970         return count;
 971 }