contrib/hostapd/src/rsn_supp/wpa_ie.c

   1 /*
   2  * wpa_supplicant - WPA/RSN IE and KDE processing
   3  * Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "wpa.h"
  19 #include "pmksa_cache.h"
  20 #include "ieee802_11_defs.h"
  21 #include "wpa_i.h"
  22 #include "wpa_ie.h"
  23
  24
  25 static int wpa_selector_to_bitfield(const u8 *s)
  26 {
  27         if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_NONE)
  28                 return WPA_CIPHER_NONE;
  29         if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_WEP40)
  30                 return WPA_CIPHER_WEP40;
  31         if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_TKIP)
  32                 return WPA_CIPHER_TKIP;
  33         if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_CCMP)
  34                 return WPA_CIPHER_CCMP;
  35         if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_WEP104)
  36                 return WPA_CIPHER_WEP104;
  37         return 0;
  38 }
  39
  40
  41 static int wpa_key_mgmt_to_bitfield(const u8 *s)
  42 {
  43         if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_UNSPEC_802_1X)
  44                 return WPA_KEY_MGMT_IEEE8021X;
  45         if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X)
  46                 return WPA_KEY_MGMT_PSK;
  47         if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_NONE)
  48                 return WPA_KEY_MGMT_WPA_NONE;
  49         return 0;
  50 }
  51
  52
  53 static int wpa_parse_wpa_ie_wpa(const u8 *wpa_ie, size_t wpa_ie_len,
  54                                 struct wpa_ie_data *data)
  55 {
  56         const struct wpa_ie_hdr *hdr;
  57         const u8 *pos;
  58         int left;
  59         int i, count;
  60
  61         os_memset(data, 0, sizeof(*data));
  62         data->proto = WPA_PROTO_WPA;
  63         data->pairwise_cipher = WPA_CIPHER_TKIP;
  64         data->group_cipher = WPA_CIPHER_TKIP;
  65         data->key_mgmt = WPA_KEY_MGMT_IEEE8021X;
  66         data->capabilities = 0;
  67         data->pmkid = NULL;
  68         data->num_pmkid = 0;
  69         data->mgmt_group_cipher = 0;
  70
  71         if (wpa_ie_len == 0) {
  72                 /* No WPA IE - fail silently */
  73                 return -1;
  74         }
  75
  76         if (wpa_ie_len < sizeof(struct wpa_ie_hdr)) {
  77                 wpa_printf(MSG_DEBUG, "%s: ie len too short %lu",
  78                            __func__, (unsigned long) wpa_ie_len);
  79                 return -1;
  80         }
  81
  82         hdr = (const struct wpa_ie_hdr *) wpa_ie;
  83
  84         if (hdr->elem_id != WLAN_EID_VENDOR_SPECIFIC ||
  85             hdr->len != wpa_ie_len - 2 ||
  86             RSN_SELECTOR_GET(hdr->oui) != WPA_OUI_TYPE ||
  87             WPA_GET_LE16(hdr->version) != WPA_VERSION) {
  88                 wpa_printf(MSG_DEBUG, "%s: malformed ie or unknown version",
  89                            __func__);
  90                 return -1;
  91         }
  92
  93         pos = (const u8 *) (hdr + 1);
  94         left = wpa_ie_len - sizeof(*hdr);
  95
  96         if (left >= WPA_SELECTOR_LEN) {
  97                 data->group_cipher = wpa_selector_to_bitfield(pos);
  98                 pos += WPA_SELECTOR_LEN;
  99                 left -= WPA_SELECTOR_LEN;
 100         } else if (left > 0) {
 101                 wpa_printf(MSG_DEBUG, "%s: ie length mismatch, %u too much",
 102                            __func__, left);
 103                 return -1;
 104         }
 105
 106         if (left >= 2) {
 107                 data->pairwise_cipher = 0;
 108                 count = WPA_GET_LE16(pos);
 109                 pos += 2;
 110                 left -= 2;
 111                 if (count == 0 || left < count * WPA_SELECTOR_LEN) {
 112                         wpa_printf(MSG_DEBUG, "%s: ie count botch (pairwise), "
 113                                    "count %u left %u", __func__, count, left);
 114                         return -1;
 115                 }
 116                 for (i = 0; i < count; i++) {
 117                         data->pairwise_cipher |= wpa_selector_to_bitfield(pos);
 118                         pos += WPA_SELECTOR_LEN;
 119                         left -= WPA_SELECTOR_LEN;
 120                 }
 121         } else if (left == 1) {
 122                 wpa_printf(MSG_DEBUG, "%s: ie too short (for key mgmt)",
 123                            __func__);
 124                 return -1;
 125         }
 126
 127         if (left >= 2) {
 128                 data->key_mgmt = 0;
 129                 count = WPA_GET_LE16(pos);
 130                 pos += 2;
 131                 left -= 2;
 132                 if (count == 0 || left < count * WPA_SELECTOR_LEN) {
 133                         wpa_printf(MSG_DEBUG, "%s: ie count botch (key mgmt), "
 134                                    "count %u left %u", __func__, count, left);
 135                         return -1;
 136                 }
 137                 for (i = 0; i < count; i++) {
 138                         data->key_mgmt |= wpa_key_mgmt_to_bitfield(pos);
 139                         pos += WPA_SELECTOR_LEN;
 140                         left -= WPA_SELECTOR_LEN;
 141                 }
 142         } else if (left == 1) {
 143                 wpa_printf(MSG_DEBUG, "%s: ie too short (for capabilities)",
 144                            __func__);
 145                 return -1;
 146         }
 147
 148         if (left >= 2) {
 149                 data->capabilities = WPA_GET_LE16(pos);
 150                 pos += 2;
 151                 left -= 2;
 152         }
 153
 154         if (left > 0) {
 155                 wpa_printf(MSG_DEBUG, "%s: ie has %u trailing bytes - ignored",
 156                            __func__, left);
 157         }
 158
 159         return 0;
 160 }
 161
 162
 163 /**
 164  * wpa_parse_wpa_ie - Parse WPA/RSN IE
 165  * @wpa_ie: Pointer to WPA or RSN IE
 166  * @wpa_ie_len: Length of the WPA/RSN IE
 167  * @data: Pointer to data area for parsing results
 168  * Returns: 0 on success, -1 on failure
 169  *
 170  * Parse the contents of WPA or RSN IE and write the parsed data into data.
 171  */
 172 int wpa_parse_wpa_ie(const u8 *wpa_ie, size_t wpa_ie_len,
 173                      struct wpa_ie_data *data)
 174 {
 175         if (wpa_ie_len >= 1 && wpa_ie[0] == WLAN_EID_RSN)
 176                 return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
 177         else
 178                 return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data);
 179 }
 180
 181
 182 static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len,
 183                               int pairwise_cipher, int group_cipher,
 184                               int key_mgmt)
 185 {
 186         u8 *pos;
 187         struct wpa_ie_hdr *hdr;
 188
 189         if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN +
 190             2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN)
 191                 return -1;
 192
 193         hdr = (struct wpa_ie_hdr *) wpa_ie;
 194         hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC;
 195         RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE);
 196         WPA_PUT_LE16(hdr->version, WPA_VERSION);
 197         pos = (u8 *) (hdr + 1);
 198
 199         if (group_cipher == WPA_CIPHER_CCMP) {
 200                 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP);
 201         } else if (group_cipher == WPA_CIPHER_TKIP) {
 202                 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP);
 203         } else if (group_cipher == WPA_CIPHER_WEP104) {
 204                 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_WEP104);
 205         } else if (group_cipher == WPA_CIPHER_WEP40) {
 206                 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_WEP40);
 207         } else {
 208                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
 209                            group_cipher);
 210                 return -1;
 211         }
 212         pos += WPA_SELECTOR_LEN;
 213
 214         *pos++ = 1;
 215         *pos++ = 0;
 216         if (pairwise_cipher == WPA_CIPHER_CCMP) {
 217                 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP);
 218         } else if (pairwise_cipher == WPA_CIPHER_TKIP) {
 219                 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP);
 220         } else if (pairwise_cipher == WPA_CIPHER_NONE) {
 221                 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_NONE);
 222         } else {
 223                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
 224                            pairwise_cipher);
 225                 return -1;
 226         }
 227         pos += WPA_SELECTOR_LEN;
 228
 229         *pos++ = 1;
 230         *pos++ = 0;
 231         if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
 232                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
 233         } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
 234                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
 235         } else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
 236                 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE);
 237         } else {
 238                 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
 239                            key_mgmt);
 240                 return -1;
 241         }
 242         pos += WPA_SELECTOR_LEN;
 243
 244         /* WPA Capabilities; use defaults, so no need to include it */
 245
 246         hdr->len = (pos - wpa_ie) - 2;
 247
 248         WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
 249
 250         return pos - wpa_ie;
 251 }
 252
 253
 254 static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len,
 255                               int pairwise_cipher, int group_cipher,
 256                               int key_mgmt, int mgmt_group_cipher,
 257                               struct wpa_sm *sm)
 258 {
 259 #ifndef CONFIG_NO_WPA2
 260         u8 *pos;
 261         struct rsn_ie_hdr *hdr;
 262         u16 capab;
 263
 264         if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN +
 265             2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 +
 266             (sm->cur_pmksa ? 2 + PMKID_LEN : 0)) {
 267                 wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)",
 268                            (unsigned long) rsn_ie_len);
 269                 return -1;
 270         }
 271
 272         hdr = (struct rsn_ie_hdr *) rsn_ie;
 273         hdr->elem_id = WLAN_EID_RSN;
 274         WPA_PUT_LE16(hdr->version, RSN_VERSION);
 275         pos = (u8 *) (hdr + 1);
 276
 277         if (group_cipher == WPA_CIPHER_CCMP) {
 278                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
 279         } else if (group_cipher == WPA_CIPHER_TKIP) {
 280                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
 281         } else if (group_cipher == WPA_CIPHER_WEP104) {
 282                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_WEP104);
 283         } else if (group_cipher == WPA_CIPHER_WEP40) {
 284                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_WEP40);
 285         } else {
 286                 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
 287                            group_cipher);
 288                 return -1;
 289         }
 290         pos += RSN_SELECTOR_LEN;
 291
 292         *pos++ = 1;
 293         *pos++ = 0;
 294         if (pairwise_cipher == WPA_CIPHER_CCMP) {
 295                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
 296         } else if (pairwise_cipher == WPA_CIPHER_TKIP) {
 297                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
 298         } else if (pairwise_cipher == WPA_CIPHER_NONE) {
 299                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NONE);
 300         } else {
 301                 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
 302                            pairwise_cipher);
 303                 return -1;
 304         }
 305         pos += RSN_SELECTOR_LEN;
 306
 307         *pos++ = 1;
 308         *pos++ = 0;
 309         if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
 310                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X);
 311         } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
 312                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X);
 313 #ifdef CONFIG_IEEE80211R
 314         } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
 315                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
 316         } else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) {
 317                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
 318 #endif /* CONFIG_IEEE80211R */
 319 #ifdef CONFIG_IEEE80211W
 320         } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) {
 321                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256);
 322         } else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) {
 323                 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256);
 324 #endif /* CONFIG_IEEE80211W */
 325         } else {
 326                 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
 327                            key_mgmt);
 328                 return -1;
 329         }
 330         pos += RSN_SELECTOR_LEN;
 331
 332         /* RSN Capabilities */
 333         capab = 0;
 334 #ifdef CONFIG_IEEE80211W
 335         if (mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
 336                 capab |= WPA_CAPABILITY_MFPC;
 337 #endif /* CONFIG_IEEE80211W */
 338         WPA_PUT_LE16(pos, capab);
 339         pos += 2;
 340
 341         if (sm->cur_pmksa) {
 342                 /* PMKID Count (2 octets, little endian) */
 343                 *pos++ = 1;
 344                 *pos++ = 0;
 345                 /* PMKID */
 346                 os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN);
 347                 pos += PMKID_LEN;
 348         }
 349
 350 #ifdef CONFIG_IEEE80211W
 351         if (mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
 352                 if (!sm->cur_pmksa) {
 353                         /* PMKID Count */
 354                         WPA_PUT_LE16(pos, 0);
 355                         pos += 2;
 356                 }
 357
 358                 /* Management Group Cipher Suite */
 359                 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
 360                 pos += RSN_SELECTOR_LEN;
 361         }
 362 #endif /* CONFIG_IEEE80211W */
 363
 364         hdr->len = (pos - rsn_ie) - 2;
 365
 366         WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
 367
 368         return pos - rsn_ie;
 369 #else /* CONFIG_NO_WPA2 */
 370         return -1;
 371 #endif /* CONFIG_NO_WPA2 */
 372 }
 373
 374
 375 /**
 376  * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
 377  * @sm: Pointer to WPA state machine data from wpa_sm_init()
 378  * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
 379  * @wpa_ie_len: Maximum length of the generated WPA/RSN IE
 380  * Returns: Length of the generated WPA/RSN IE or -1 on failure
 381  */
 382 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
 383 {
 384         if (sm->proto == WPA_PROTO_RSN)
 385                 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
 386                                           sm->pairwise_cipher,
 387                                           sm->group_cipher,
 388                                           sm->key_mgmt, sm->mgmt_group_cipher,
 389                                           sm);
 390         else
 391                 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
 392                                           sm->pairwise_cipher,
 393                                           sm->group_cipher,
 394                                           sm->key_mgmt);
 395 }
 396
 397
 398 /**
 399  * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs
 400  * @pos: Pointer to the IE header
 401  * @end: Pointer to the end of the Key Data buffer
 402  * @ie: Pointer to parsed IE data
 403  * Returns: 0 on success, 1 if end mark is found, -1 on failure
 404  */
 405 static int wpa_parse_generic(const u8 *pos, const u8 *end,
 406                              struct wpa_eapol_ie_parse *ie)
 407 {
 408         if (pos[1] == 0)
 409                 return 1;
 410
 411         if (pos[1] >= 6 &&
 412             RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE &&
 413             pos[2 + WPA_SELECTOR_LEN] == 1 &&
 414             pos[2 + WPA_SELECTOR_LEN + 1] == 0) {
 415                 ie->wpa_ie = pos;
 416                 ie->wpa_ie_len = pos[1] + 2;
 417                 return 0;
 418         }
 419
 420         if (pos + 1 + RSN_SELECTOR_LEN < end &&
 421             pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN &&
 422             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) {
 423                 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN;
 424                 return 0;
 425         }
 426
 427         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 428             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) {
 429                 ie->gtk = pos + 2 + RSN_SELECTOR_LEN;
 430                 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN;
 431                 return 0;
 432         }
 433
 434         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 435             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) {
 436                 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN;
 437                 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN;
 438                 return 0;
 439         }
 440
 441 #ifdef CONFIG_PEERKEY
 442         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 443             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_SMK) {
 444                 ie->smk = pos + 2 + RSN_SELECTOR_LEN;
 445                 ie->smk_len = pos[1] - RSN_SELECTOR_LEN;
 446                 return 0;
 447         }
 448
 449         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 450             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_NONCE) {
 451                 ie->nonce = pos + 2 + RSN_SELECTOR_LEN;
 452                 ie->nonce_len = pos[1] - RSN_SELECTOR_LEN;
 453                 return 0;
 454         }
 455
 456         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 457             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_LIFETIME) {
 458                 ie->lifetime = pos + 2 + RSN_SELECTOR_LEN;
 459                 ie->lifetime_len = pos[1] - RSN_SELECTOR_LEN;
 460                 return 0;
 461         }
 462
 463         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 464             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_ERROR) {
 465                 ie->error = pos + 2 + RSN_SELECTOR_LEN;
 466                 ie->error_len = pos[1] - RSN_SELECTOR_LEN;
 467                 return 0;
 468         }
 469 #endif /* CONFIG_PEERKEY */
 470
 471 #ifdef CONFIG_IEEE80211W
 472         if (pos[1] > RSN_SELECTOR_LEN + 2 &&
 473             RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) {
 474                 ie->igtk = pos + 2 + RSN_SELECTOR_LEN;
 475                 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN;
 476                 return 0;
 477         }
 478 #endif /* CONFIG_IEEE80211W */
 479
 480         return 0;
 481 }
 482
 483
 484 /**
 485  * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs
 486  * @buf: Pointer to the Key Data buffer
 487  * @len: Key Data Length
 488  * @ie: Pointer to parsed IE data
 489  * Returns: 0 on success, -1 on failure
 490  */
 491 int wpa_supplicant_parse_ies(const u8 *buf, size_t len,
 492                              struct wpa_eapol_ie_parse *ie)
 493 {
 494         const u8 *pos, *end;
 495         int ret = 0;
 496
 497         os_memset(ie, 0, sizeof(*ie));
 498         for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) {
 499                 if (pos[0] == 0xdd &&
 500                     ((pos == buf + len - 1) || pos[1] == 0)) {
 501                         /* Ignore padding */
 502                         break;
 503                 }
 504                 if (pos + 2 + pos[1] > end) {
 505                         wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data "
 506                                    "underflow (ie=%d len=%d pos=%d)",
 507                                    pos[0], pos[1], (int) (pos - buf));
 508                         wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data",
 509                                         buf, len);
 510                         ret = -1;
 511                         break;
 512                 }
 513                 if (*pos == WLAN_EID_RSN) {
 514                         ie->rsn_ie = pos;
 515                         ie->rsn_ie_len = pos[1] + 2;
 516 #ifdef CONFIG_IEEE80211R
 517                 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN) {
 518                         ie->mdie = pos;
 519                         ie->mdie_len = pos[1] + 2;
 520 #endif /* CONFIG_IEEE80211R */
 521                 } else if (*pos == WLAN_EID_VENDOR_SPECIFIC) {
 522                         ret = wpa_parse_generic(pos, end, ie);
 523                         if (ret < 0)
 524                                 break;
 525                         if (ret > 0) {
 526                                 ret = 0;
 527                                 break;
 528                         }
 529                 } else {
 530                         wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key "
 531                                     "Key Data IE", pos, 2 + pos[1]);
 532                 }
 533         }
 534
 535         return ret;
 536 }