contrib/wpa/src/rsn_supp/wpa_ie.c

   1 /*
   2  * wpa_supplicant - WPA/RSN IE and KDE processing
   3  * Copyright (c) 2003-2015, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "wpa.h"
  13 #include "pmksa_cache.h"
  14 #include "common/ieee802_11_defs.h"
  15 #include "wpa_i.h"
  16 #include "wpa_ie.h"
  17
  18
  19 /**
  20  * wpa_parse_wpa_ie - Parse WPA/RSN IE
  21  * @wpa_ie: Pointer to WPA or RSN IE
  22  * @wpa_ie_len: Length of the WPA/RSN IE
  23  * @data: Pointer to data area for parsing results
  24  * Returns: 0 on success, -1 on failure
  25  *
  26  * Parse the contents of WPA or RSN IE and write the parsed data into data.
  27  */
  28 int wpa_parse_wpa_ie(const u8 *wpa_ie, size_t wpa_ie_len,
  29                      struct wpa_ie_data *data)
  30 {
  31         if (wpa_ie_len >= 1 && wpa_ie[0] == WLAN_EID_RSN)
  32                 return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
  33         else
  34                 return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data);
  35 }
  36
  37
  38 static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len,
  39                               int pairwise_cipher, int group_cipher,
  40                               int key_mgmt)
  41 {
  42         u8 *pos;
  43         struct wpa_ie_hdr *hdr;
  44         u32 suite;
  45
  46         if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN +
  47             2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN)
  48                 return -1;
  49
  50         hdr = (struct wpa_ie_hdr *) wpa_ie;
  51         hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC;
  52         RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE);
  53         WPA_PUT_LE16(hdr->version, WPA_VERSION);
  54         pos = (u8 *) (hdr + 1);
  55
  56         suite = wpa_cipher_to_suite(WPA_PROTO_WPA, group_cipher);
  57         if (suite == 0) {
  58                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
  59                            group_cipher);
  60                 return -1;
  61         }
  62         RSN_SELECTOR_PUT(pos, suite);
  63         pos += WPA_SELECTOR_LEN;
  64
  65         *pos++ = 1;
  66         *pos++ = 0;
  67         suite = wpa_cipher_to_suite(WPA_PROTO_WPA, pairwise_cipher);
  68         if (suite == 0 ||
  69             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
  70              pairwise_cipher != WPA_CIPHER_NONE)) {
  71                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
  72                            pairwise_cipher);
  73                 return -1;
  74         }
  75         RSN_SELECTOR_PUT(pos, suite);
  76         pos += WPA_SELECTOR_LEN;
  77
  78         *pos++ = 1;
  79         *pos++ = 0;
  80         if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
  81                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
  82         } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
  83                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
  84         } else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
  85                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE);
  86         } else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
  87                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_CCKM);
  88         } else {
  89                 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
  90                            key_mgmt);
  91                 return -1;
  92         }
  93         pos += WPA_SELECTOR_LEN;
  94
  95         /* WPA Capabilities; use defaults, so no need to include it */
  96
  97         hdr->len = (pos - wpa_ie) - 2;
  98
  99         WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
 100
 101         return pos - wpa_ie;
 102 }
 103
 104
 105 static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len,
 106                               int pairwise_cipher, int group_cipher,
 107                               int key_mgmt, int mgmt_group_cipher,
 108                               struct wpa_sm *sm)
 109 {
 110         u8 *pos;
 111         struct rsn_ie_hdr *hdr;
 112         u16 capab;
 113         u32 suite;
 114
 115         if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN +
 116             2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 +
 117             (sm->cur_pmksa ? 2 + PMKID_LEN : 0)) {
 118                 wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)",
 119                            (unsigned long) rsn_ie_len);
 120                 return -1;
 121         }
 122
 123         hdr = (struct rsn_ie_hdr *) rsn_ie;
 124         hdr->elem_id = WLAN_EID_RSN;
 125         WPA_PUT_LE16(hdr->version, RSN_VERSION);
 126         pos = (u8 *) (hdr + 1);
 127
 128         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
 129         if (suite == 0) {
 130                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
 131                            group_cipher);
 132                 return -1;
 133         }
 134         RSN_SELECTOR_PUT(pos, suite);
 135         pos += RSN_SELECTOR_LEN;
 136
 137         *pos++ = 1;
 138         *pos++ = 0;
 139         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
 140         if (suite == 0 ||
 141             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
 142              pairwise_cipher != WPA_CIPHER_NONE)) {
 143                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
 144                            pairwise_cipher);
 145                 return -1;
 146         }
 147         RSN_SELECTOR_PUT(pos, suite);
 148         pos += RSN_SELECTOR_LEN;
 149
 150         *pos++ = 1;
 151         *pos++ = 0;
 152         if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
 153                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X);
 154         } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
 155                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X);
 156         } else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
 157                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_CCKM);
 158 #ifdef CONFIG_IEEE80211R
 159         } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
 160                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 161         } else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) {
 162                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 163 #endif /* CONFIG_IEEE80211R */
 164 #ifdef CONFIG_IEEE80211W
 165         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) {
 166                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256);
 167         } else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) {
 168                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256);
 169 #endif /* CONFIG_IEEE80211W */
 170 #ifdef CONFIG_SAE
 171         } else if (key_mgmt == WPA_KEY_MGMT_SAE) {
 172                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_SAE);
 173         } else if (key_mgmt == WPA_KEY_MGMT_FT_SAE) {
 174                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
 175 #endif /* CONFIG_SAE */
 176         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) {
 177                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B_192);
 178         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B) {
 179                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B);
 180         } else {
 181                 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
 182                            key_mgmt);
 183                 return -1;
 184         }
 185         pos += RSN_SELECTOR_LEN;
 186
 187         /* RSN Capabilities */
 188         capab = 0;
 189 #ifdef CONFIG_IEEE80211W
 190         if (sm->mfp)
 191                 capab |= WPA_CAPABILITY_MFPC;
 192         if (sm->mfp == 2)
 193                 capab |= WPA_CAPABILITY_MFPR;
 194 #endif /* CONFIG_IEEE80211W */
 195         WPA_PUT_LE16(pos, capab);
 196         pos += 2;
 197
 198         if (sm->cur_pmksa) {
 199                 /* PMKID Count (2 octets, little endian) */
 200                 *pos++ = 1;
 201                 *pos++ = 0;
 202                 /* PMKID */
 203                 os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN);
 204                 pos += PMKID_LEN;
 205         }
 206
 207 #ifdef CONFIG_IEEE80211W
 208         if (wpa_cipher_valid_mgmt_group(mgmt_group_cipher)) {
 209                 if (!sm->cur_pmksa) {
 210                         /* PMKID Count */
 211                         WPA_PUT_LE16(pos, 0);
 212                         pos += 2;
 213                 }
 214
 215                 /* Management Group Cipher Suite */
 216                 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
 217                                                           mgmt_group_cipher));
 218                 pos += RSN_SELECTOR_LEN;
 219         }
 220 #endif /* CONFIG_IEEE80211W */
 221
 222         hdr->len = (pos - rsn_ie) - 2;
 223
 224         WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
 225
 226         return pos - rsn_ie;
 227 }
 228
 229
 230 #ifdef CONFIG_HS20
 231 static int wpa_gen_wpa_ie_osen(u8 *wpa_ie, size_t wpa_ie_len,
 232                                int pairwise_cipher, int group_cipher,
 233                                int key_mgmt)
 234 {
 235         u8 *pos, *len;
 236         u32 suite;
 237
 238         if (wpa_ie_len < 2 + 4 + RSN_SELECTOR_LEN +
 239             2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN)
 240                 return -1;
 241
 242         pos = wpa_ie;
 243         *pos++ = WLAN_EID_VENDOR_SPECIFIC;
 244         len = pos++; /* to be filled */
 245         WPA_PUT_BE24(pos, OUI_WFA);
 246         pos += 3;
 247         *pos++ = HS20_OSEN_OUI_TYPE;
 248
 249         /* Group Data Cipher Suite */
 250         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
 251         if (suite == 0) {
 252                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
 253                            group_cipher);
 254                 return -1;
 255         }
 256         RSN_SELECTOR_PUT(pos, suite);
 257         pos += RSN_SELECTOR_LEN;
 258
 259         /* Pairwise Cipher Suite Count and List */
 260         WPA_PUT_LE16(pos, 1);
 261         pos += 2;
 262         suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
 263         if (suite == 0 ||
 264             (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
 265              pairwise_cipher != WPA_CIPHER_NONE)) {
 266                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
 267                            pairwise_cipher);
 268                 return -1;
 269         }
 270         RSN_SELECTOR_PUT(pos, suite);
 271         pos += RSN_SELECTOR_LEN;
 272
 273         /* AKM Suite Count and List */
 274         WPA_PUT_LE16(pos, 1);
 275         pos += 2;
 276         RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN);
 277         pos += RSN_SELECTOR_LEN;
 278
 279         *len = pos - len - 1;
 280
 281         WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
 282
 283         return pos - wpa_ie;
 284 }
 285 #endif /* CONFIG_HS20 */
 286
 287
 288 /**
 289  * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
 290  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 291  * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
 292  * @wpa_ie_len: Maximum length of the generated WPA/RSN IE
 293  * Returns: Length of the generated WPA/RSN IE or -1 on failure
 294  */
 295 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
 296 {
 297         if (sm->proto == WPA_PROTO_RSN)
 298                 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
 299                                           sm->pairwise_cipher,
 300                                           sm->group_cipher,
 301                                           sm->key_mgmt, sm->mgmt_group_cipher,
 302                                           sm);
 303 #ifdef CONFIG_HS20
 304         else if (sm->proto == WPA_PROTO_OSEN)
 305                 return wpa_gen_wpa_ie_osen(wpa_ie, wpa_ie_len,
 306                                            sm->pairwise_cipher,
 307                                            sm->group_cipher,
 308                                            sm->key_mgmt);
 309 #endif /* CONFIG_HS20 */
 310         else
 311                 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
 312                                           sm->pairwise_cipher,
 313                                           sm->group_cipher,
 314                                           sm->key_mgmt);
 315 }
 316
 317
 318 /**
 319  * wpa_parse_vendor_specific - Parse Vendor Specific IEs
 320  * @pos: Pointer to the IE header
 321  * @end: Pointer to the end of the Key Data buffer
 322  * @ie: Pointer to parsed IE data
 323  * Returns: 0 on success, 1 if end mark is found, -1 on failure
 324  */
 325 static int wpa_parse_vendor_specific(const u8 *pos, const u8 *end,
 326                                      struct wpa_eapol_ie_parse *ie)
 327 {
 328         unsigned int oui;
 329
 330         if (pos[1] < 4) {
 331                 wpa_printf(MSG_MSGDUMP, "Too short vendor specific IE ignored (len=%u)",
 332                            pos[1]);
 333                 return 1;
 334         }
 335
 336         oui = WPA_GET_BE24(&pos[2]);
 337         if (oui == OUI_MICROSOFT && pos[5] == WMM_OUI_TYPE && pos[1] > 4) {
 338                 if (pos[6] == WMM_OUI_SUBTYPE_INFORMATION_ELEMENT) {
 339                         ie->wmm = &pos[2];
 340                         ie->wmm_len = pos[1];
 341                         wpa_hexdump(MSG_DEBUG, "WPA: WMM IE",
 342                                     ie->wmm, ie->wmm_len);
 343                 } else if (pos[6] == WMM_OUI_SUBTYPE_PARAMETER_ELEMENT) {
 344                         ie->wmm = &pos[2];
 345                         ie->wmm_len = pos[1];
 346                         wpa_hexdump(MSG_DEBUG, "WPA: WMM Parameter Element",
 347                                     ie->wmm, ie->wmm_len);
 348                 }
 349         }
 350         return 0;
 351 }
 352
 353
 354 /**
 355  * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs
 356  * @pos: Pointer to the IE header
 357  * @end: Pointer to the end of the Key Data buffer
 358  * @ie: Pointer to parsed IE data
 359  * Returns: 0 on success, 1 if end mark is found, -1 on failure
 360  */
 361 static int wpa_parse_generic(const u8 *pos, const u8 *end,
 362                              struct wpa_eapol_ie_parse *ie)
 363 {
 364         if (pos[1] == 0)
 365                 return 1;
 366
 367         if (pos[1] >= 6 &&
 368             RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE &&
 369             pos[2 + WPA_SELECTOR_LEN] == 1 &&
 370             pos[2 + WPA_SELECTOR_LEN + 1] == 0) {
 371                 ie->wpa_ie = pos;
 372                 ie->wpa_ie_len = pos[1] + 2;
 373                 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key",
 374                             ie->wpa_ie, ie->wpa_ie_len);
 375                 return 0;
 376         }
 377
 378         if (pos + 1 + RSN_SELECTOR_LEN < end &&
 379             pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN &&
 380             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) {
 381                 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN;
 382                 wpa_hexdump(MSG_DEBUG, "WPA: PMKID in EAPOL-Key",
 383                             pos, pos[1] + 2);
 384                 return 0;
 385         }
 386
 387         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 388             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) {
 389                 ie->gtk = pos + 2 + RSN_SELECTOR_LEN;
 390                 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN;
 391                 wpa_hexdump_key(MSG_DEBUG, "WPA: GTK in EAPOL-Key",
 392                                 pos, pos[1] + 2);
 393                 return 0;
 394         }
 395
 396         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 397             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) {
 398                 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN;
 399                 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN;
 400                 wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key",
 401                             pos, pos[1] + 2);
 402                 return 0;
 403         }
 404
 405 #ifdef CONFIG_PEERKEY
 406         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 407             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_SMK) {
 408                 ie->smk = pos + 2 + RSN_SELECTOR_LEN;
 409                 ie->smk_len = pos[1] - RSN_SELECTOR_LEN;
 410                 wpa_hexdump_key(MSG_DEBUG, "WPA: SMK in EAPOL-Key",
 411                                 pos, pos[1] + 2);
 412                 return 0;
 413         }
 414
 415         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 416             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_NONCE) {
 417                 ie->nonce = pos + 2 + RSN_SELECTOR_LEN;
 418                 ie->nonce_len = pos[1] - RSN_SELECTOR_LEN;
 419                 wpa_hexdump(MSG_DEBUG, "WPA: Nonce in EAPOL-Key",
 420                             pos, pos[1] + 2);
 421                 return 0;
 422         }
 423
 424         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 425             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_LIFETIME) {
 426                 ie->lifetime = pos + 2 + RSN_SELECTOR_LEN;
 427                 ie->lifetime_len = pos[1] - RSN_SELECTOR_LEN;
 428                 wpa_hexdump(MSG_DEBUG, "WPA: Lifetime in EAPOL-Key",
 429                             pos, pos[1] + 2);
 430                 return 0;
 431         }
 432
 433         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 434             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_ERROR) {
 435                 ie->error = pos + 2 + RSN_SELECTOR_LEN;
 436                 ie->error_len = pos[1] - RSN_SELECTOR_LEN;
 437                 wpa_hexdump(MSG_DEBUG, "WPA: Error in EAPOL-Key",
 438                             pos, pos[1] + 2);
 439                 return 0;
 440         }
 441 #endif /* CONFIG_PEERKEY */
 442
 443 #ifdef CONFIG_IEEE80211W
 444         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 445             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) {
 446                 ie->igtk = pos + 2 + RSN_SELECTOR_LEN;
 447                 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN;
 448                 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK in EAPOL-Key",
 449                                 pos, pos[1] + 2);
 450                 return 0;
 451         }
 452 #endif /* CONFIG_IEEE80211W */
 453
 454 #ifdef CONFIG_P2P
 455         if (pos[1] >= RSN_SELECTOR_LEN + 1 &&
 456             RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_REQ) {
 457                 ie->ip_addr_req = pos + 2 + RSN_SELECTOR_LEN;
 458                 wpa_hexdump(MSG_DEBUG, "WPA: IP Address Request in EAPOL-Key",
 459                             ie->ip_addr_req, pos[1] - RSN_SELECTOR_LEN);
 460                 return 0;
 461         }
 462
 463         if (pos[1] >= RSN_SELECTOR_LEN + 3 * 4 &&
 464             RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_ALLOC) {
 465                 ie->ip_addr_alloc = pos + 2 + RSN_SELECTOR_LEN;
 466                 wpa_hexdump(MSG_DEBUG,
 467                             "WPA: IP Address Allocation in EAPOL-Key",
 468                             ie->ip_addr_alloc, pos[1] - RSN_SELECTOR_LEN);
 469                 return 0;
 470         }
 471 #endif /* CONFIG_P2P */
 472
 473         return 0;
 474 }
 475
 476
 477 /**
 478  * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs
 479  * @buf: Pointer to the Key Data buffer
 480  * @len: Key Data Length
 481  * @ie: Pointer to parsed IE data
 482  * Returns: 0 on success, -1 on failure
 483  */
 484 int wpa_supplicant_parse_ies(const u8 *buf, size_t len,
 485                              struct wpa_eapol_ie_parse *ie)
 486 {
 487         const u8 *pos, *end;
 488         int ret = 0;
 489
 490         os_memset(ie, 0, sizeof(*ie));
 491         for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) {
 492                 if (pos[0] == 0xdd &&
 493                     ((pos == buf + len - 1) || pos[1] == 0)) {
 494                         /* Ignore padding */
 495                         break;
 496                 }
 497                 if (pos + 2 + pos[1] > end) {
 498                         wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data "
 499                                    "underflow (ie=%d len=%d pos=%d)",
 500                                    pos[0], pos[1], (int) (pos - buf));
 501                         wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data",
 502                                         buf, len);
 503                         ret = -1;
 504                         break;
 505                 }
 506                 if (*pos == WLAN_EID_RSN) {
 507                         ie->rsn_ie = pos;
 508                         ie->rsn_ie_len = pos[1] + 2;
 509                         wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key",
 510                                     ie->rsn_ie, ie->rsn_ie_len);
 511                 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN) {
 512                         ie->mdie = pos;
 513                         ie->mdie_len = pos[1] + 2;
 514                         wpa_hexdump(MSG_DEBUG, "WPA: MDIE in EAPOL-Key",
 515                                     ie->mdie, ie->mdie_len);
 516                 } else if (*pos == WLAN_EID_FAST_BSS_TRANSITION) {
 517                         ie->ftie = pos;
 518                         ie->ftie_len = pos[1] + 2;
 519                         wpa_hexdump(MSG_DEBUG, "WPA: FTIE in EAPOL-Key",
 520                                     ie->ftie, ie->ftie_len);
 521                 } else if (*pos == WLAN_EID_TIMEOUT_INTERVAL && pos[1] >= 5) {
 522                         if (pos[2] == WLAN_TIMEOUT_REASSOC_DEADLINE) {
 523                                 ie->reassoc_deadline = pos;
 524                                 wpa_hexdump(MSG_DEBUG, "WPA: Reassoc Deadline "
 525                                             "in EAPOL-Key",
 526                                             ie->reassoc_deadline, pos[1] + 2);
 527                         } else if (pos[2] == WLAN_TIMEOUT_KEY_LIFETIME) {
 528                                 ie->key_lifetime = pos;
 529                                 wpa_hexdump(MSG_DEBUG, "WPA: KeyLifetime "
 530                                             "in EAPOL-Key",
 531                                             ie->key_lifetime, pos[1] + 2);
 532                         } else {
 533                                 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized "
 534                                             "EAPOL-Key Key Data IE",
 535                                             pos, 2 + pos[1]);
 536                         }
 537                 } else if (*pos == WLAN_EID_LINK_ID) {
 538                         if (pos[1] >= 18) {
 539                                 ie->lnkid = pos;
 540                                 ie->lnkid_len = pos[1] + 2;
 541                         }
 542                 } else if (*pos == WLAN_EID_EXT_CAPAB) {
 543                         ie->ext_capab = pos;
 544                         ie->ext_capab_len = pos[1] + 2;
 545                 } else if (*pos == WLAN_EID_SUPP_RATES) {
 546                         ie->supp_rates = pos;
 547                         ie->supp_rates_len = pos[1] + 2;
 548                 } else if (*pos == WLAN_EID_EXT_SUPP_RATES) {
 549                         ie->ext_supp_rates = pos;
 550                         ie->ext_supp_rates_len = pos[1] + 2;
 551                 } else if (*pos == WLAN_EID_HT_CAP) {
 552                         ie->ht_capabilities = pos + 2;
 553                         ie->ht_capabilities_len = pos[1];
 554                 } else if (*pos == WLAN_EID_VHT_AID) {
 555                         if (pos[1] >= 2)
 556                                 ie->aid = WPA_GET_LE16(pos + 2) & 0x3fff;
 557                 } else if (*pos == WLAN_EID_VHT_CAP) {
 558                         ie->vht_capabilities = pos + 2;
 559                         ie->vht_capabilities_len = pos[1];
 560                 } else if (*pos == WLAN_EID_QOS && pos[1] >= 1) {
 561                         ie->qosinfo = pos[2];
 562                 } else if (*pos == WLAN_EID_SUPPORTED_CHANNELS) {
 563                         ie->supp_channels = pos + 2;
 564                         ie->supp_channels_len = pos[1];
 565                 } else if (*pos == WLAN_EID_SUPPORTED_OPERATING_CLASSES) {
 566                         /*
 567                          * The value of the Length field of the Supported
 568                          * Operating Classes element is between 2 and 253.
 569                          * Silently skip invalid elements to avoid interop
 570                          * issues when trying to use the value.
 571                          */
 572                         if (pos[1] >= 2 && pos[1] <= 253) {
 573                                 ie->supp_oper_classes = pos + 2;
 574                                 ie->supp_oper_classes_len = pos[1];
 575                         }
 576                 } else if (*pos == WLAN_EID_VENDOR_SPECIFIC) {
 577                         ret = wpa_parse_generic(pos, end, ie);
 578                         if (ret < 0)
 579                                 break;
 580                         if (ret > 0) {
 581                                 ret = 0;
 582                                 break;
 583                         }
 584
 585                         ret = wpa_parse_vendor_specific(pos, end, ie);
 586                         if (ret < 0)
 587                                 break;
 588                         if (ret > 0) {
 589                                 ret = 0;
 590                                 break;
 591                         }
 592                 } else {
 593                         wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key "
 594                                     "Key Data IE", pos, 2 + pos[1]);
 595                 }
 596         }
 597
 598         return ret;
 599 }