wpa_supplicant/interworking.c

   1 /*
   2  * Interworking (IEEE 802.11u)
   3  * Copyright (c) 2011-2012, Qualcomm Atheros, Inc.
   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 "common/ieee802_11_defs.h"
  13 #include "common/gas.h"
  14 #include "common/wpa_ctrl.h"
  15 #include "drivers/driver.h"
  16 #include "eap_common/eap_defs.h"
  17 #include "eap_peer/eap_methods.h"
  18 #include "wpa_supplicant_i.h"
  19 #include "config.h"
  20 #include "config_ssid.h"
  21 #include "bss.h"
  22 #include "scan.h"
  23 #include "notify.h"
  24 #include "gas_query.h"
  25 #include "interworking.h"
  26
  27
  28 #if defined(EAP_SIM) | defined(EAP_SIM_DYNAMIC)
  29 #define INTERWORKING_3GPP
  30 #else
  31 #if defined(EAP_AKA) | defined(EAP_AKA_DYNAMIC)
  32 #define INTERWORKING_3GPP
  33 #else
  34 #if defined(EAP_AKA_PRIME) | defined(EAP_AKA_PRIME_DYNAMIC)
  35 #define INTERWORKING_3GPP
  36 #endif
  37 #endif
  38 #endif
  39
  40 static void interworking_next_anqp_fetch(struct wpa_supplicant *wpa_s);
  41
  42
  43 static struct wpabuf * anqp_build_req(u16 info_ids[], size_t num_ids,
  44                                       struct wpabuf *extra)
  45 {
  46         struct wpabuf *buf;
  47         size_t i;
  48         u8 *len_pos;
  49
  50         buf = gas_anqp_build_initial_req(0, 4 + num_ids * 2 +
  51                                          (extra ? wpabuf_len(extra) : 0));
  52         if (buf == NULL)
  53                 return NULL;
  54
  55         len_pos = gas_anqp_add_element(buf, ANQP_QUERY_LIST);
  56         for (i = 0; i < num_ids; i++)
  57                 wpabuf_put_le16(buf, info_ids[i]);
  58         gas_anqp_set_element_len(buf, len_pos);
  59         if (extra)
  60                 wpabuf_put_buf(buf, extra);
  61
  62         gas_anqp_set_len(buf);
  63
  64         return buf;
  65 }
  66
  67
  68 static void interworking_anqp_resp_cb(void *ctx, const u8 *dst,
  69                                       u8 dialog_token,
  70                                       enum gas_query_result result,
  71                                       const struct wpabuf *adv_proto,
  72                                       const struct wpabuf *resp,
  73                                       u16 status_code)
  74 {
  75         struct wpa_supplicant *wpa_s = ctx;
  76
  77         anqp_resp_cb(wpa_s, dst, dialog_token, result, adv_proto, resp,
  78                      status_code);
  79         interworking_next_anqp_fetch(wpa_s);
  80 }
  81
  82
  83 static int interworking_anqp_send_req(struct wpa_supplicant *wpa_s,
  84                                       struct wpa_bss *bss)
  85 {
  86         struct wpabuf *buf;
  87         int ret = 0;
  88         int res;
  89         u16 info_ids[] = {
  90                 ANQP_CAPABILITY_LIST,
  91                 ANQP_VENUE_NAME,
  92                 ANQP_NETWORK_AUTH_TYPE,
  93                 ANQP_ROAMING_CONSORTIUM,
  94                 ANQP_IP_ADDR_TYPE_AVAILABILITY,
  95                 ANQP_NAI_REALM,
  96                 ANQP_3GPP_CELLULAR_NETWORK,
  97                 ANQP_DOMAIN_NAME
  98         };
  99         struct wpabuf *extra = NULL;
 100
 101         wpa_printf(MSG_DEBUG, "Interworking: ANQP Query Request to " MACSTR,
 102                    MAC2STR(bss->bssid));
 103
 104         buf = anqp_build_req(info_ids, sizeof(info_ids) / sizeof(info_ids[0]),
 105                              extra);
 106         wpabuf_free(extra);
 107         if (buf == NULL)
 108                 return -1;
 109
 110         res = gas_query_req(wpa_s->gas, bss->bssid, bss->freq, buf,
 111                             interworking_anqp_resp_cb, wpa_s);
 112         if (res < 0) {
 113                 wpa_printf(MSG_DEBUG, "ANQP: Failed to send Query Request");
 114                 ret = -1;
 115         } else
 116                 wpa_printf(MSG_DEBUG, "ANQP: Query started with dialog token "
 117                            "%u", res);
 118
 119         wpabuf_free(buf);
 120         return ret;
 121 }
 122
 123
 124 struct nai_realm_eap {
 125         u8 method;
 126         u8 inner_method;
 127         enum nai_realm_eap_auth_inner_non_eap inner_non_eap;
 128         u8 cred_type;
 129         u8 tunneled_cred_type;
 130 };
 131
 132 struct nai_realm {
 133         u8 encoding;
 134         char *realm;
 135         u8 eap_count;
 136         struct nai_realm_eap *eap;
 137 };
 138
 139
 140 static void nai_realm_free(struct nai_realm *realms, u16 count)
 141 {
 142         u16 i;
 143
 144         if (realms == NULL)
 145                 return;
 146         for (i = 0; i < count; i++) {
 147                 os_free(realms[i].eap);
 148                 os_free(realms[i].realm);
 149         }
 150         os_free(realms);
 151 }
 152
 153
 154 static const u8 * nai_realm_parse_eap(struct nai_realm_eap *e, const u8 *pos,
 155                                       const u8 *end)
 156 {
 157         u8 elen, auth_count, a;
 158         const u8 *e_end;
 159
 160         if (pos + 3 > end) {
 161                 wpa_printf(MSG_DEBUG, "No room for EAP Method fixed fields");
 162                 return NULL;
 163         }
 164
 165         elen = *pos++;
 166         if (pos + elen > end || elen < 2) {
 167                 wpa_printf(MSG_DEBUG, "No room for EAP Method subfield");
 168                 return NULL;
 169         }
 170         e_end = pos + elen;
 171         e->method = *pos++;
 172         auth_count = *pos++;
 173         wpa_printf(MSG_DEBUG, "EAP Method: len=%u method=%u auth_count=%u",
 174                    elen, e->method, auth_count);
 175
 176         for (a = 0; a < auth_count; a++) {
 177                 u8 id, len;
 178
 179                 if (pos + 2 > end || pos + 2 + pos[1] > end) {
 180                         wpa_printf(MSG_DEBUG, "No room for Authentication "
 181                                    "Parameter subfield");
 182                         return NULL;
 183                 }
 184
 185                 id = *pos++;
 186                 len = *pos++;
 187
 188                 switch (id) {
 189                 case NAI_REALM_EAP_AUTH_NON_EAP_INNER_AUTH:
 190                         if (len < 1)
 191                                 break;
 192                         e->inner_non_eap = *pos;
 193                         if (e->method != EAP_TYPE_TTLS)
 194                                 break;
 195                         switch (*pos) {
 196                         case NAI_REALM_INNER_NON_EAP_PAP:
 197                                 wpa_printf(MSG_DEBUG, "EAP-TTLS/PAP");
 198                                 break;
 199                         case NAI_REALM_INNER_NON_EAP_CHAP:
 200                                 wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP");
 201                                 break;
 202                         case NAI_REALM_INNER_NON_EAP_MSCHAP:
 203                                 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP");
 204                                 break;
 205                         case NAI_REALM_INNER_NON_EAP_MSCHAPV2:
 206                                 wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2");
 207                                 break;
 208                         }
 209                         break;
 210                 case NAI_REALM_EAP_AUTH_INNER_AUTH_EAP_METHOD:
 211                         if (len < 1)
 212                                 break;
 213                         e->inner_method = *pos;
 214                         wpa_printf(MSG_DEBUG, "Inner EAP method: %u",
 215                                    e->inner_method);
 216                         break;
 217                 case NAI_REALM_EAP_AUTH_CRED_TYPE:
 218                         if (len < 1)
 219                                 break;
 220                         e->cred_type = *pos;
 221                         wpa_printf(MSG_DEBUG, "Credential Type: %u",
 222                                    e->cred_type);
 223                         break;
 224                 case NAI_REALM_EAP_AUTH_TUNNELED_CRED_TYPE:
 225                         if (len < 1)
 226                                 break;
 227                         e->tunneled_cred_type = *pos;
 228                         wpa_printf(MSG_DEBUG, "Tunneled EAP Method Credential "
 229                                    "Type: %u", e->tunneled_cred_type);
 230                         break;
 231                 default:
 232                         wpa_printf(MSG_DEBUG, "Unsupported Authentication "
 233                                    "Parameter: id=%u len=%u", id, len);
 234                         wpa_hexdump(MSG_DEBUG, "Authentication Parameter "
 235                                     "Value", pos, len);
 236                         break;
 237                 }
 238
 239                 pos += len;
 240         }
 241
 242         return e_end;
 243 }
 244
 245
 246 static const u8 * nai_realm_parse_realm(struct nai_realm *r, const u8 *pos,
 247                                         const u8 *end)
 248 {
 249         u16 len;
 250         const u8 *f_end;
 251         u8 realm_len, e;
 252
 253         if (end - pos < 4) {
 254                 wpa_printf(MSG_DEBUG, "No room for NAI Realm Data "
 255                            "fixed fields");
 256                 return NULL;
 257         }
 258
 259         len = WPA_GET_LE16(pos); /* NAI Realm Data field Length */
 260         pos += 2;
 261         if (pos + len > end || len < 3) {
 262                 wpa_printf(MSG_DEBUG, "No room for NAI Realm Data "
 263                            "(len=%u; left=%u)",
 264                            len, (unsigned int) (end - pos));
 265                 return NULL;
 266         }
 267         f_end = pos + len;
 268
 269         r->encoding = *pos++;
 270         realm_len = *pos++;
 271         if (pos + realm_len > f_end) {
 272                 wpa_printf(MSG_DEBUG, "No room for NAI Realm "
 273                            "(len=%u; left=%u)",
 274                            realm_len, (unsigned int) (f_end - pos));
 275                 return NULL;
 276         }
 277         wpa_hexdump_ascii(MSG_DEBUG, "NAI Realm", pos, realm_len);
 278         r->realm = os_malloc(realm_len + 1);
 279         if (r->realm == NULL)
 280                 return NULL;
 281         os_memcpy(r->realm, pos, realm_len);
 282         r->realm[realm_len] = '\0';
 283         pos += realm_len;
 284
 285         if (pos + 1 > f_end) {
 286                 wpa_printf(MSG_DEBUG, "No room for EAP Method Count");
 287                 return NULL;
 288         }
 289         r->eap_count = *pos++;
 290         wpa_printf(MSG_DEBUG, "EAP Count: %u", r->eap_count);
 291         if (pos + r->eap_count * 3 > f_end) {
 292                 wpa_printf(MSG_DEBUG, "No room for EAP Methods");
 293                 return NULL;
 294         }
 295         r->eap = os_zalloc(r->eap_count * sizeof(struct nai_realm_eap));
 296         if (r->eap == NULL)
 297                 return NULL;
 298
 299         for (e = 0; e < r->eap_count; e++) {
 300                 pos = nai_realm_parse_eap(&r->eap[e], pos, f_end);
 301                 if (pos == NULL)
 302                         return NULL;
 303         }
 304
 305         return f_end;
 306 }
 307
 308
 309 static struct nai_realm * nai_realm_parse(struct wpabuf *anqp, u16 *count)
 310 {
 311         struct nai_realm *realm;
 312         const u8 *pos, *end;
 313         u16 i, num;
 314
 315         if (anqp == NULL || wpabuf_len(anqp) < 2)
 316                 return NULL;
 317
 318         pos = wpabuf_head_u8(anqp);
 319         end = pos + wpabuf_len(anqp);
 320         num = WPA_GET_LE16(pos);
 321         wpa_printf(MSG_DEBUG, "NAI Realm Count: %u", num);
 322         pos += 2;
 323
 324         if (num * 5 > end - pos) {
 325                 wpa_printf(MSG_DEBUG, "Invalid NAI Realm Count %u - not "
 326                            "enough data (%u octets) for that many realms",
 327                            num, (unsigned int) (end - pos));
 328                 return NULL;
 329         }
 330
 331         realm = os_zalloc(num * sizeof(struct nai_realm));
 332         if (realm == NULL)
 333                 return NULL;
 334
 335         for (i = 0; i < num; i++) {
 336                 pos = nai_realm_parse_realm(&realm[i], pos, end);
 337                 if (pos == NULL) {
 338                         nai_realm_free(realm, num);
 339                         return NULL;
 340                 }
 341         }
 342
 343         *count = num;
 344         return realm;
 345 }
 346
 347
 348 static int nai_realm_match(struct nai_realm *realm, const char *home_realm)
 349 {
 350         char *tmp, *pos, *end;
 351         int match = 0;
 352
 353         if (realm->realm == NULL || home_realm == NULL)
 354                 return 0;
 355
 356         if (os_strchr(realm->realm, ';') == NULL)
 357                 return os_strcasecmp(realm->realm, home_realm) == 0;
 358
 359         tmp = os_strdup(realm->realm);
 360         if (tmp == NULL)
 361                 return 0;
 362
 363         pos = tmp;
 364         while (*pos) {
 365                 end = os_strchr(pos, ';');
 366                 if (end)
 367                         *end = '\0';
 368                 if (os_strcasecmp(pos, home_realm) == 0) {
 369                         match = 1;
 370                         break;
 371                 }
 372                 if (end == NULL)
 373                         break;
 374                 pos = end + 1;
 375         }
 376
 377         os_free(tmp);
 378
 379         return match;
 380 }
 381
 382
 383 static int nai_realm_cred_username(struct nai_realm_eap *eap)
 384 {
 385         if (eap_get_name(EAP_VENDOR_IETF, eap->method) == NULL)
 386                 return 0; /* method not supported */
 387
 388         if (eap->method != EAP_TYPE_TTLS && eap->method != EAP_TYPE_PEAP) {
 389                 /* Only tunneled methods with username/password supported */
 390                 return 0;
 391         }
 392
 393         if (eap->method == EAP_TYPE_PEAP &&
 394             eap_get_name(EAP_VENDOR_IETF, eap->inner_method) == NULL)
 395                 return 0;
 396
 397         if (eap->method == EAP_TYPE_TTLS) {
 398                 if (eap->inner_method == 0 && eap->inner_non_eap == 0)
 399                         return 0;
 400                 if (eap->inner_method &&
 401                     eap_get_name(EAP_VENDOR_IETF, eap->inner_method) == NULL)
 402                         return 0;
 403                 if (eap->inner_non_eap &&
 404                     eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_PAP &&
 405                     eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_CHAP &&
 406                     eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_MSCHAP &&
 407                     eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_MSCHAPV2)
 408                         return 0;
 409         }
 410
 411         if (eap->inner_method &&
 412             eap->inner_method != EAP_TYPE_GTC &&
 413             eap->inner_method != EAP_TYPE_MSCHAPV2)
 414                 return 0;
 415
 416         return 1;
 417 }
 418
 419
 420 static struct nai_realm_eap * nai_realm_find_eap(struct wpa_cred *cred,
 421                                                  struct nai_realm *realm)
 422 {
 423         u8 e;
 424
 425         if (cred == NULL ||
 426             cred->username == NULL ||
 427             cred->username[0] == '\0' ||
 428             cred->password == NULL ||
 429             cred->password[0] == '\0')
 430                 return NULL;
 431
 432         for (e = 0; e < realm->eap_count; e++) {
 433                 struct nai_realm_eap *eap = &realm->eap[e];
 434                 if (nai_realm_cred_username(eap))
 435                         return eap;
 436         }
 437
 438         return NULL;
 439 }
 440
 441
 442 #ifdef INTERWORKING_3GPP
 443
 444 static int plmn_id_match(struct wpabuf *anqp, const char *imsi)
 445 {
 446         const char *sep;
 447         u8 plmn[3];
 448         const u8 *pos, *end;
 449         u8 udhl;
 450
 451         sep = os_strchr(imsi, '-');
 452         if (sep == NULL || (sep - imsi != 5 && sep - imsi != 6))
 453                 return 0;
 454
 455         /* See Annex A of 3GPP TS 24.234 v8.1.0 for description */
 456         plmn[0] = (imsi[0] - '0') | ((imsi[1] - '0') << 4);
 457         plmn[1] = imsi[2] - '0';
 458         if (sep - imsi == 6)
 459                 plmn[1] |= (imsi[5] - '0') << 4;
 460         else
 461                 plmn[1] |= 0xf0;
 462         plmn[2] = (imsi[3] - '0') | ((imsi[4] - '0') << 4);
 463
 464         if (anqp == NULL)
 465                 return 0;
 466         pos = wpabuf_head_u8(anqp);
 467         end = pos + wpabuf_len(anqp);
 468         if (pos + 2 > end)
 469                 return 0;
 470         if (*pos != 0) {
 471                 wpa_printf(MSG_DEBUG, "Unsupported GUD version 0x%x", *pos);
 472                 return 0;
 473         }
 474         pos++;
 475         udhl = *pos++;
 476         if (pos + udhl > end) {
 477                 wpa_printf(MSG_DEBUG, "Invalid UDHL");
 478                 return 0;
 479         }
 480         end = pos + udhl;
 481
 482         while (pos + 2 <= end) {
 483                 u8 iei, len;
 484                 const u8 *l_end;
 485                 iei = *pos++;
 486                 len = *pos++ & 0x7f;
 487                 if (pos + len > end)
 488                         break;
 489                 l_end = pos + len;
 490
 491                 if (iei == 0 && len > 0) {
 492                         /* PLMN List */
 493                         u8 num, i;
 494                         num = *pos++;
 495                         for (i = 0; i < num; i++) {
 496                                 if (pos + 3 > end)
 497                                         break;
 498                                 if (os_memcmp(pos, plmn, 3) == 0)
 499                                         return 1; /* Found matching PLMN */
 500                         }
 501                 }
 502
 503                 pos = l_end;
 504         }
 505
 506         return 0;
 507 }
 508
 509
 510 static int build_root_nai(char *nai, const char *imsi, char prefix)
 511 {
 512         const char *sep, *msin;
 513         char *end, *pos;
 514         size_t msin_len, plmn_len;
 515
 516         /*
 517          * TS 23.003, Clause 14 (3GPP to WLAN Interworking)
 518          * Root NAI:
 519          * <aka:0|sim:1><IMSI>@wlan.mnc<MNC>.mcc<MCC>.3gppnetwork.org
 520          * <MNC> is zero-padded to three digits in case two-digit MNC is used
 521          */
 522
 523         if (imsi == NULL || os_strlen(imsi) > 16) {
 524                 wpa_printf(MSG_DEBUG, "No valid IMSI available");
 525                 return -1;
 526         }
 527         sep = os_strchr(imsi, '-');
 528         if (sep == NULL)
 529                 return -1;
 530         plmn_len = sep - imsi;
 531         if (plmn_len != 5 && plmn_len != 6)
 532                 return -1;
 533         msin = sep + 1;
 534         msin_len = os_strlen(msin);
 535
 536         pos = nai;
 537         end = pos + sizeof(nai);
 538         if (prefix)
 539                 *pos++ = prefix;
 540         os_memcpy(pos, imsi, plmn_len);
 541         pos += plmn_len;
 542         os_memcpy(pos, msin, msin_len);
 543         pos += msin_len;
 544         pos += os_snprintf(pos, end - pos, "@wlan.mnc");
 545         if (plmn_len == 5) {
 546                 *pos++ = '0';
 547                 *pos++ = imsi[3];
 548                 *pos++ = imsi[4];
 549         } else {
 550                 *pos++ = imsi[3];
 551                 *pos++ = imsi[4];
 552                 *pos++ = imsi[5];
 553         }
 554         pos += os_snprintf(pos, end - pos, ".mcc%c%c%c.3gppnetwork.org",
 555                            imsi[0], imsi[1], imsi[2]);
 556
 557         return 0;
 558 }
 559
 560
 561 static int set_root_nai(struct wpa_ssid *ssid, const char *imsi, char prefix)
 562 {
 563         char nai[100];
 564         if (build_root_nai(nai, imsi, prefix) < 0)
 565                 return -1;
 566         return wpa_config_set_quoted(ssid, "identity", nai);
 567 }
 568
 569 #endif /* INTERWORKING_3GPP */
 570
 571
 572 static int interworking_connect_3gpp(struct wpa_supplicant *wpa_s,
 573                                      struct wpa_bss *bss)
 574 {
 575 #ifdef INTERWORKING_3GPP
 576         struct wpa_cred *cred;
 577         struct wpa_ssid *ssid;
 578         const u8 *ie;
 579
 580         if (bss->anqp_3gpp == NULL)
 581                 return -1;
 582
 583         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 584                 if (cred->imsi == NULL || !cred->imsi[0] ||
 585                     cred->milenage == NULL || !cred->milenage[0])
 586                         continue;
 587                 if (plmn_id_match(bss->anqp_3gpp, cred->imsi))
 588                         break;
 589         }
 590         if (cred == NULL)
 591                 return -1;
 592
 593         ie = wpa_bss_get_ie(bss, WLAN_EID_SSID);
 594         if (ie == NULL)
 595                 return -1;
 596         wpa_printf(MSG_DEBUG, "Interworking: Connect with " MACSTR " (3GPP)",
 597                    MAC2STR(bss->bssid));
 598
 599         ssid = wpa_config_add_network(wpa_s->conf);
 600         if (ssid == NULL)
 601                 return -1;
 602
 603         wpas_notify_network_added(wpa_s, ssid);
 604         wpa_config_set_network_defaults(ssid);
 605         ssid->priority = cred->priority;
 606         ssid->temporary = 1;
 607         ssid->ssid = os_zalloc(ie[1] + 1);
 608         if (ssid->ssid == NULL)
 609                 goto fail;
 610         os_memcpy(ssid->ssid, ie + 2, ie[1]);
 611         ssid->ssid_len = ie[1];
 612
 613         /* TODO: figure out whether to use EAP-SIM, EAP-AKA, or EAP-AKA' */
 614         if (wpa_config_set(ssid, "eap", "SIM", 0) < 0) {
 615                 wpa_printf(MSG_DEBUG, "EAP-SIM not supported");
 616                 goto fail;
 617         }
 618         if (set_root_nai(ssid, cred->imsi, '1') < 0) {
 619                 wpa_printf(MSG_DEBUG, "Failed to set Root NAI");
 620                 goto fail;
 621         }
 622
 623         if (cred->milenage && cred->milenage[0]) {
 624                 if (wpa_config_set_quoted(ssid, "password",
 625                                           cred->milenage) < 0)
 626                         goto fail;
 627         } else {
 628                 /* TODO: PIN */
 629                 if (wpa_config_set_quoted(ssid, "pcsc", "") < 0)
 630                         goto fail;
 631         }
 632
 633         if (cred->password && cred->password[0] &&
 634             wpa_config_set_quoted(ssid, "password", cred->password) < 0)
 635                 goto fail;
 636
 637         wpa_config_update_prio_list(wpa_s->conf);
 638         wpa_s->disconnected = 0;
 639         wpa_s->reassociate = 1;
 640         wpa_supplicant_req_scan(wpa_s, 0, 0);
 641
 642         return 0;
 643
 644 fail:
 645         wpas_notify_network_removed(wpa_s, ssid);
 646         wpa_config_remove_network(wpa_s->conf, ssid->id);
 647 #endif /* INTERWORKING_3GPP */
 648         return -1;
 649 }
 650
 651
 652 int interworking_connect(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 653 {
 654         struct wpa_cred *cred;
 655         struct wpa_ssid *ssid;
 656         struct nai_realm *realm;
 657         struct nai_realm_eap *eap = NULL;
 658         u16 count, i;
 659         char buf[100];
 660         const u8 *ie;
 661
 662         if (wpa_s->conf->cred == NULL || bss == NULL)
 663                 return -1;
 664         ie = wpa_bss_get_ie(bss, WLAN_EID_SSID);
 665         if (ie == NULL || ie[1] == 0) {
 666                 wpa_printf(MSG_DEBUG, "Interworking: No SSID known for "
 667                            MACSTR, MAC2STR(bss->bssid));
 668                 return -1;
 669         }
 670
 671         realm = nai_realm_parse(bss->anqp_nai_realm, &count);
 672         if (realm == NULL) {
 673                 wpa_printf(MSG_DEBUG, "Interworking: Could not parse NAI "
 674                            "Realm list from " MACSTR, MAC2STR(bss->bssid));
 675                 count = 0;
 676         }
 677
 678         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 679                 for (i = 0; i < count; i++) {
 680                         if (!nai_realm_match(&realm[i], cred->realm))
 681                                 continue;
 682                         eap = nai_realm_find_eap(cred, &realm[i]);
 683                         if (eap)
 684                                 break;
 685                 }
 686                 if (eap)
 687                         break;
 688         }
 689
 690         if (!eap) {
 691                 if (interworking_connect_3gpp(wpa_s, bss) == 0) {
 692                         if (realm)
 693                                 nai_realm_free(realm, count);
 694                         return 0;
 695                 }
 696
 697                 wpa_printf(MSG_DEBUG, "Interworking: No matching credentials "
 698                            "and EAP method found for " MACSTR,
 699                            MAC2STR(bss->bssid));
 700                 nai_realm_free(realm, count);
 701                 return -1;
 702         }
 703
 704         wpa_printf(MSG_DEBUG, "Interworking: Connect with " MACSTR,
 705                    MAC2STR(bss->bssid));
 706
 707         ssid = wpa_config_add_network(wpa_s->conf);
 708         if (ssid == NULL) {
 709                 nai_realm_free(realm, count);
 710                 return -1;
 711         }
 712         wpas_notify_network_added(wpa_s, ssid);
 713         wpa_config_set_network_defaults(ssid);
 714         ssid->priority = cred->priority;
 715         ssid->temporary = 1;
 716         ssid->ssid = os_zalloc(ie[1] + 1);
 717         if (ssid->ssid == NULL)
 718                 goto fail;
 719         os_memcpy(ssid->ssid, ie + 2, ie[1]);
 720         ssid->ssid_len = ie[1];
 721
 722         if (wpa_config_set(ssid, "eap", eap_get_name(EAP_VENDOR_IETF,
 723                                                      eap->method), 0) < 0)
 724                 goto fail;
 725
 726         if (eap->method == EAP_TYPE_TTLS &&
 727             cred->username && cred->username[0]) {
 728                 const char *pos;
 729                 char *anon;
 730                 /* Use anonymous NAI in Phase 1 */
 731                 pos = os_strchr(cred->username, '@');
 732                 if (pos) {
 733                         size_t buflen = 9 + os_strlen(pos) + 1;
 734                         anon = os_malloc(buflen);
 735                         if (anon == NULL)
 736                                 goto fail;
 737                         os_snprintf(anon, buflen, "anonymous%s", pos);
 738                 } else {
 739                         anon = os_strdup("anonymous");
 740                         if (anon == NULL)
 741                                 goto fail;
 742                 }
 743                 if (wpa_config_set_quoted(ssid, "anonymous_identity", anon) <
 744                     0) {
 745                         os_free(anon);
 746                         goto fail;
 747                 }
 748                 os_free(anon);
 749         }
 750
 751         if (cred->username && cred->username[0] &&
 752             wpa_config_set_quoted(ssid, "identity", cred->username) < 0)
 753                 goto fail;
 754
 755         if (cred->password && cred->password[0] &&
 756             wpa_config_set_quoted(ssid, "password", cred->password) < 0)
 757                 goto fail;
 758
 759         switch (eap->method) {
 760         case EAP_TYPE_TTLS:
 761                 if (eap->inner_method) {
 762                         os_snprintf(buf, sizeof(buf), "\"autheap=%s\"",
 763                                     eap_get_name(EAP_VENDOR_IETF,
 764                                                  eap->inner_method));
 765                         if (wpa_config_set(ssid, "phase2", buf, 0) < 0)
 766                                 goto fail;
 767                         break;
 768                 }
 769                 switch (eap->inner_non_eap) {
 770                 case NAI_REALM_INNER_NON_EAP_PAP:
 771                         if (wpa_config_set(ssid, "phase2", "\"auth=PAP\"", 0) <
 772                             0)
 773                                 goto fail;
 774                         break;
 775                 case NAI_REALM_INNER_NON_EAP_CHAP:
 776                         if (wpa_config_set(ssid, "phase2", "\"auth=CHAP\"", 0)
 777                             < 0)
 778                                 goto fail;
 779                         break;
 780                 case NAI_REALM_INNER_NON_EAP_MSCHAP:
 781                         if (wpa_config_set(ssid, "phase2", "\"auth=MSCHAP\"",
 782                                            0) < 0)
 783                                 goto fail;
 784                         break;
 785                 case NAI_REALM_INNER_NON_EAP_MSCHAPV2:
 786                         if (wpa_config_set(ssid, "phase2", "\"auth=MSCHAPV2\"",
 787                                            0) < 0)
 788                                 goto fail;
 789                         break;
 790                 }
 791                 break;
 792         case EAP_TYPE_PEAP:
 793                 os_snprintf(buf, sizeof(buf), "\"auth=%s\"",
 794                             eap_get_name(EAP_VENDOR_IETF, eap->inner_method));
 795                 if (wpa_config_set(ssid, "phase2", buf, 0) < 0)
 796                         goto fail;
 797                 break;
 798         }
 799
 800         if (cred->ca_cert && cred->ca_cert[0] &&
 801             wpa_config_set_quoted(ssid, "ca_cert", cred->ca_cert) < 0)
 802                 goto fail;
 803
 804         nai_realm_free(realm, count);
 805
 806         wpa_config_update_prio_list(wpa_s->conf);
 807         wpa_s->disconnected = 0;
 808         wpa_s->reassociate = 1;
 809         wpa_supplicant_req_scan(wpa_s, 0, 0);
 810
 811         return 0;
 812
 813 fail:
 814         wpas_notify_network_removed(wpa_s, ssid);
 815         wpa_config_remove_network(wpa_s->conf, ssid->id);
 816         nai_realm_free(realm, count);
 817         return -1;
 818 }
 819
 820
 821 static struct wpa_cred * interworking_credentials_available_3gpp(
 822         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 823 {
 824         struct wpa_cred *cred, *selected = NULL;
 825         int ret;
 826
 827 #ifdef INTERWORKING_3GPP
 828         if (bss->anqp_3gpp == NULL)
 829                 return NULL;
 830
 831         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 832                 if (cred->imsi == NULL || !cred->imsi[0] ||
 833                     cred->milenage == NULL || !cred->milenage[0])
 834                         continue;
 835
 836                 wpa_printf(MSG_DEBUG, "Interworking: Parsing 3GPP info from "
 837                            MACSTR, MAC2STR(bss->bssid));
 838                 ret = plmn_id_match(bss->anqp_3gpp, cred->imsi);
 839                 wpa_printf(MSG_DEBUG, "PLMN match %sfound", ret ? "" : "not ");
 840                 if (ret) {
 841                         if (selected == NULL ||
 842                             selected->priority < cred->priority)
 843                                 selected = cred;
 844                 }
 845         }
 846 #endif /* INTERWORKING_3GPP */
 847         return selected;
 848 }
 849
 850
 851 static struct wpa_cred * interworking_credentials_available_realm(
 852         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 853 {
 854         struct wpa_cred *cred, *selected = NULL;
 855         struct nai_realm *realm;
 856         u16 count, i;
 857
 858         if (bss->anqp_nai_realm == NULL)
 859                 return NULL;
 860
 861         if (wpa_s->conf->cred == NULL)
 862                 return NULL;
 863
 864         wpa_printf(MSG_DEBUG, "Interworking: Parsing NAI Realm list from "
 865                    MACSTR, MAC2STR(bss->bssid));
 866         realm = nai_realm_parse(bss->anqp_nai_realm, &count);
 867         if (realm == NULL) {
 868                 wpa_printf(MSG_DEBUG, "Interworking: Could not parse NAI "
 869                            "Realm list from " MACSTR, MAC2STR(bss->bssid));
 870                 return NULL;
 871         }
 872
 873         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 874                 if (cred->realm == NULL)
 875                         continue;
 876
 877                 for (i = 0; i < count; i++) {
 878                         if (!nai_realm_match(&realm[i], cred->realm))
 879                                 continue;
 880                         if (nai_realm_find_eap(cred, &realm[i])) {
 881                                 if (selected == NULL ||
 882                                     selected->priority < cred->priority)
 883                                         selected = cred;
 884                                 break;
 885                         }
 886                 }
 887         }
 888
 889         nai_realm_free(realm, count);
 890
 891         return selected;
 892 }
 893
 894
 895 static struct wpa_cred * interworking_credentials_available(
 896         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 897 {
 898         struct wpa_cred *cred, *cred2;
 899
 900         cred = interworking_credentials_available_realm(wpa_s, bss);
 901         cred2 = interworking_credentials_available_3gpp(wpa_s, bss);
 902         if (cred && cred2 && cred2->priority >= cred->priority)
 903                 cred = cred2;
 904         if (!cred)
 905                 cred = cred2;
 906
 907         return cred;
 908 }
 909
 910
 911 static int domain_name_list_contains(struct wpabuf *domain_names,
 912                                      const char *domain)
 913 {
 914         const u8 *pos, *end;
 915         size_t len;
 916
 917         len = os_strlen(domain);
 918         pos = wpabuf_head(domain_names);
 919         end = pos + wpabuf_len(domain_names);
 920
 921         while (pos + 1 < end) {
 922                 if (pos + 1 + pos[0] > end)
 923                         break;
 924
 925                 wpa_hexdump_ascii(MSG_DEBUG, "Interworking: AP domain name",
 926                                   pos + 1, pos[0]);
 927                 if (pos[0] == len &&
 928                     os_strncasecmp(domain, (const char *) (pos + 1), len) == 0)
 929                         return 1;
 930
 931                 pos += 1 + pos[0];
 932         }
 933
 934         return 0;
 935 }
 936
 937
 938 static int interworking_home_sp(struct wpa_supplicant *wpa_s,
 939                                 struct wpabuf *domain_names)
 940 {
 941         struct wpa_cred *cred;
 942 #ifdef INTERWORKING_3GPP
 943         char nai[100], *realm;
 944 #endif /* INTERWORKING_3GPP */
 945
 946         if (domain_names == NULL || wpa_s->conf->cred == NULL)
 947                 return -1;
 948
 949         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 950 #ifdef INTERWORKING_3GPP
 951                 if (cred->imsi &&
 952                     build_root_nai(nai, cred->imsi, 0) == 0) {
 953                         realm = os_strchr(nai, '@');
 954                         if (realm)
 955                                 realm++;
 956                         wpa_printf(MSG_DEBUG, "Interworking: Search for match "
 957                                    "with SIM/USIM domain %s", realm);
 958                         if (realm &&
 959                             domain_name_list_contains(domain_names, realm))
 960                                 return 1;
 961                 }
 962 #endif /* INTERWORKING_3GPP */
 963
 964                 if (cred->domain == NULL)
 965                         continue;
 966
 967                 wpa_printf(MSG_DEBUG, "Interworking: Search for match with "
 968                            "home SP FQDN %s", cred->domain);
 969                 if (domain_name_list_contains(domain_names, cred->domain))
 970                         return 1;
 971         }
 972
 973         return 0;
 974 }
 975
 976
 977 static int interworking_find_network_match(struct wpa_supplicant *wpa_s)
 978 {
 979         struct wpa_bss *bss;
 980         struct wpa_ssid *ssid;
 981
 982         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
 983                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 984                         if (ssid->disabled || ssid->mode != WPAS_MODE_INFRA)
 985                                 continue;
 986                         if (ssid->ssid_len != bss->ssid_len ||
 987                             os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) !=
 988                             0)
 989                                 continue;
 990                         /*
 991                          * TODO: Consider more accurate matching of security
 992                          * configuration similarly to what is done in events.c
 993                          */
 994                         return 1;
 995                 }
 996         }
 997
 998         return 0;
 999 }
1000
1001
1002 static void interworking_select_network(struct wpa_supplicant *wpa_s)
1003 {
1004         struct wpa_bss *bss, *selected = NULL, *selected_home = NULL;
1005         int selected_prio = -999999, selected_home_prio = -999999;
1006         unsigned int count = 0;
1007         const char *type;
1008         int res;
1009         struct wpa_cred *cred;
1010
1011         wpa_s->network_select = 0;
1012
1013         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
1014                 cred = interworking_credentials_available(wpa_s, bss);
1015                 if (!cred)
1016                         continue;
1017                 count++;
1018                 res = interworking_home_sp(wpa_s, bss->anqp_domain_name);
1019                 if (res > 0)
1020                         type = "home";
1021                 else if (res == 0)
1022                         type = "roaming";
1023                 else
1024                         type = "unknown";
1025                 wpa_msg(wpa_s, MSG_INFO, INTERWORKING_AP MACSTR " type=%s",
1026                         MAC2STR(bss->bssid), type);
1027                 if (wpa_s->auto_select) {
1028                         if (selected == NULL ||
1029                             cred->priority > selected_prio) {
1030                                 selected = bss;
1031                                 selected_prio = cred->priority;
1032                         }
1033                         if (res > 0 &&
1034                             (selected_home == NULL ||
1035                              cred->priority > selected_home_prio)) {
1036                                 selected_home = bss;
1037                                 selected_home_prio = cred->priority;
1038                         }
1039                 }
1040         }
1041
1042         if (selected_home && selected_home != selected &&
1043             selected_home_prio >= selected_prio) {
1044                 /* Prefer network operated by the Home SP */
1045                 selected = selected_home;
1046         }
1047
1048         if (count == 0) {
1049                 /*
1050                  * No matching network was found based on configured
1051                  * credentials. Check whether any of the enabled network blocks
1052                  * have matching APs.
1053                  */
1054                 if (interworking_find_network_match(wpa_s)) {
1055                         wpa_printf(MSG_DEBUG, "Interworking: Possible BSS "
1056                                    "match for enabled network configurations");
1057                         wpa_s->disconnected = 0;
1058                         wpa_s->reassociate = 1;
1059                         wpa_supplicant_req_scan(wpa_s, 0, 0);
1060                         return;
1061                 }
1062
1063                 wpa_msg(wpa_s, MSG_INFO, INTERWORKING_NO_MATCH "No network "
1064                         "with matching credentials found");
1065         }
1066
1067         if (selected)
1068                 interworking_connect(wpa_s, selected);
1069 }
1070
1071
1072 static void interworking_next_anqp_fetch(struct wpa_supplicant *wpa_s)
1073 {
1074         struct wpa_bss *bss;
1075         int found = 0;
1076         const u8 *ie;
1077
1078         if (!wpa_s->fetch_anqp_in_progress)
1079                 return;
1080
1081         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
1082                 if (!(bss->caps & IEEE80211_CAP_ESS))
1083                         continue;
1084                 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_CAPAB);
1085                 if (ie == NULL || ie[1] < 4 || !(ie[5] & 0x80))
1086                         continue; /* AP does not support Interworking */
1087
1088                 if (!(bss->flags & WPA_BSS_ANQP_FETCH_TRIED)) {
1089                         found++;
1090                         bss->flags |= WPA_BSS_ANQP_FETCH_TRIED;
1091                         wpa_msg(wpa_s, MSG_INFO, "Starting ANQP fetch for "
1092                                 MACSTR, MAC2STR(bss->bssid));
1093                         interworking_anqp_send_req(wpa_s, bss);
1094                         break;
1095                 }
1096         }
1097
1098         if (found == 0) {
1099                 wpa_msg(wpa_s, MSG_INFO, "ANQP fetch completed");
1100                 wpa_s->fetch_anqp_in_progress = 0;
1101                 if (wpa_s->network_select)
1102                         interworking_select_network(wpa_s);
1103         }
1104 }
1105
1106
1107 static void interworking_start_fetch_anqp(struct wpa_supplicant *wpa_s)
1108 {
1109         struct wpa_bss *bss;
1110
1111         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list)
1112                 bss->flags &= ~WPA_BSS_ANQP_FETCH_TRIED;
1113
1114         wpa_s->fetch_anqp_in_progress = 1;
1115         interworking_next_anqp_fetch(wpa_s);
1116 }
1117
1118
1119 int interworking_fetch_anqp(struct wpa_supplicant *wpa_s)
1120 {
1121         if (wpa_s->fetch_anqp_in_progress || wpa_s->network_select)
1122                 return 0;
1123
1124         wpa_s->network_select = 0;
1125
1126         interworking_start_fetch_anqp(wpa_s);
1127
1128         return 0;
1129 }
1130
1131
1132 void interworking_stop_fetch_anqp(struct wpa_supplicant *wpa_s)
1133 {
1134         if (!wpa_s->fetch_anqp_in_progress)
1135                 return;
1136
1137         wpa_s->fetch_anqp_in_progress = 0;
1138 }
1139
1140
1141 int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
1142                   u16 info_ids[], size_t num_ids)
1143 {
1144         struct wpabuf *buf;
1145         int ret = 0;
1146         int freq;
1147         struct wpa_bss *bss;
1148         int res;
1149
1150         freq = wpa_s->assoc_freq;
1151         bss = wpa_bss_get_bssid(wpa_s, dst);
1152         if (bss)
1153                 freq = bss->freq;
1154         if (freq <= 0)
1155                 return -1;
1156
1157         wpa_printf(MSG_DEBUG, "ANQP: Query Request to " MACSTR " for %u id(s)",
1158                    MAC2STR(dst), (unsigned int) num_ids);
1159
1160         buf = anqp_build_req(info_ids, num_ids, NULL);
1161         if (buf == NULL)
1162                 return -1;
1163
1164         res = gas_query_req(wpa_s->gas, dst, freq, buf, anqp_resp_cb, wpa_s);
1165         if (res < 0) {
1166                 wpa_printf(MSG_DEBUG, "ANQP: Failed to send Query Request");
1167                 ret = -1;
1168         } else
1169                 wpa_printf(MSG_DEBUG, "ANQP: Query started with dialog token "
1170                            "%u", res);
1171
1172         wpabuf_free(buf);
1173         return ret;
1174 }
1175
1176
1177 static void interworking_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
1178                                             const u8 *sa, u16 info_id,
1179                                             const u8 *data, size_t slen)
1180 {
1181         const u8 *pos = data;
1182         struct wpa_bss *bss = wpa_bss_get_bssid(wpa_s, sa);
1183
1184         switch (info_id) {
1185         case ANQP_CAPABILITY_LIST:
1186                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1187                         " ANQP Capability list", MAC2STR(sa));
1188                 break;
1189         case ANQP_VENUE_NAME:
1190                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1191                         " Venue Name", MAC2STR(sa));
1192                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Venue Name", pos, slen);
1193                 if (bss) {
1194                         wpabuf_free(bss->anqp_venue_name);
1195                         bss->anqp_venue_name = wpabuf_alloc_copy(pos, slen);
1196                 }
1197                 break;
1198         case ANQP_NETWORK_AUTH_TYPE:
1199                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1200                         " Network Authentication Type information",
1201                         MAC2STR(sa));
1202                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Network Authentication "
1203                                   "Type", pos, slen);
1204                 if (bss) {
1205                         wpabuf_free(bss->anqp_network_auth_type);
1206                         bss->anqp_network_auth_type =
1207                                 wpabuf_alloc_copy(pos, slen);
1208                 }
1209                 break;
1210         case ANQP_ROAMING_CONSORTIUM:
1211                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1212                         " Roaming Consortium list", MAC2STR(sa));
1213                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Roaming Consortium",
1214                                   pos, slen);
1215                 if (bss) {
1216                         wpabuf_free(bss->anqp_roaming_consortium);
1217                         bss->anqp_roaming_consortium =
1218                                 wpabuf_alloc_copy(pos, slen);
1219                 }
1220                 break;
1221         case ANQP_IP_ADDR_TYPE_AVAILABILITY:
1222                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1223                         " IP Address Type Availability information",
1224                         MAC2STR(sa));
1225                 wpa_hexdump(MSG_MSGDUMP, "ANQP: IP Address Availability",
1226                             pos, slen);
1227                 if (bss) {
1228                         wpabuf_free(bss->anqp_ip_addr_type_availability);
1229                         bss->anqp_ip_addr_type_availability =
1230                                 wpabuf_alloc_copy(pos, slen);
1231                 }
1232                 break;
1233         case ANQP_NAI_REALM:
1234                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1235                         " NAI Realm list", MAC2STR(sa));
1236                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: NAI Realm", pos, slen);
1237                 if (bss) {
1238                         wpabuf_free(bss->anqp_nai_realm);
1239                         bss->anqp_nai_realm = wpabuf_alloc_copy(pos, slen);
1240                 }
1241                 break;
1242         case ANQP_3GPP_CELLULAR_NETWORK:
1243                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1244                         " 3GPP Cellular Network information", MAC2STR(sa));
1245                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: 3GPP Cellular Network",
1246                                   pos, slen);
1247                 if (bss) {
1248                         wpabuf_free(bss->anqp_3gpp);
1249                         bss->anqp_3gpp = wpabuf_alloc_copy(pos, slen);
1250                 }
1251                 break;
1252         case ANQP_DOMAIN_NAME:
1253                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1254                         " Domain Name list", MAC2STR(sa));
1255                 wpa_hexdump_ascii(MSG_MSGDUMP, "ANQP: Domain Name", pos, slen);
1256                 if (bss) {
1257                         wpabuf_free(bss->anqp_domain_name);
1258                         bss->anqp_domain_name = wpabuf_alloc_copy(pos, slen);
1259                 }
1260                 break;
1261         case ANQP_VENDOR_SPECIFIC:
1262                 if (slen < 3)
1263                         return;
1264
1265                 switch (WPA_GET_BE24(pos)) {
1266                 default:
1267                         wpa_printf(MSG_DEBUG, "Interworking: Unsupported "
1268                                    "vendor-specific ANQP OUI %06x",
1269                                    WPA_GET_BE24(pos));
1270                         return;
1271                 }
1272                 break;
1273         default:
1274                 wpa_printf(MSG_DEBUG, "Interworking: Unsupported ANQP Info ID "
1275                            "%u", info_id);
1276                 break;
1277         }
1278 }
1279
1280
1281 void anqp_resp_cb(void *ctx, const u8 *dst, u8 dialog_token,
1282                   enum gas_query_result result,
1283                   const struct wpabuf *adv_proto,
1284                   const struct wpabuf *resp, u16 status_code)
1285 {
1286         struct wpa_supplicant *wpa_s = ctx;
1287         const u8 *pos;
1288         const u8 *end;
1289         u16 info_id;
1290         u16 slen;
1291
1292         if (result != GAS_QUERY_SUCCESS)
1293                 return;
1294
1295         pos = wpabuf_head(adv_proto);
1296         if (wpabuf_len(adv_proto) < 4 || pos[0] != WLAN_EID_ADV_PROTO ||
1297             pos[1] < 2 || pos[3] != ACCESS_NETWORK_QUERY_PROTOCOL) {
1298                 wpa_printf(MSG_DEBUG, "ANQP: Unexpected Advertisement "
1299                            "Protocol in response");
1300                 return;
1301         }
1302
1303         pos = wpabuf_head(resp);
1304         end = pos + wpabuf_len(resp);
1305
1306         while (pos < end) {
1307                 if (pos + 4 > end) {
1308                         wpa_printf(MSG_DEBUG, "ANQP: Invalid element");
1309                         break;
1310                 }
1311                 info_id = WPA_GET_LE16(pos);
1312                 pos += 2;
1313                 slen = WPA_GET_LE16(pos);
1314                 pos += 2;
1315                 if (pos + slen > end) {
1316                         wpa_printf(MSG_DEBUG, "ANQP: Invalid element length "
1317                                    "for Info ID %u", info_id);
1318                         break;
1319                 }
1320                 interworking_parse_rx_anqp_resp(wpa_s, dst, info_id, pos,
1321                                                 slen);
1322                 pos += slen;
1323         }
1324 }
1325
1326
1327 static void interworking_scan_res_handler(struct wpa_supplicant *wpa_s,
1328                                           struct wpa_scan_results *scan_res)
1329 {
1330         wpa_printf(MSG_DEBUG, "Interworking: Scan results available - start "
1331                    "ANQP fetch");
1332         interworking_start_fetch_anqp(wpa_s);
1333 }
1334
1335
1336 int interworking_select(struct wpa_supplicant *wpa_s, int auto_select)
1337 {
1338         interworking_stop_fetch_anqp(wpa_s);
1339         wpa_s->network_select = 1;
1340         wpa_s->auto_select = !!auto_select;
1341         wpa_printf(MSG_DEBUG, "Interworking: Start scan for network "
1342                    "selection");
1343         wpa_s->scan_res_handler = interworking_scan_res_handler;
1344         wpa_s->scan_req = 2;
1345         wpa_supplicant_req_scan(wpa_s, 0, 0);
1346
1347         return 0;
1348 }