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, size_t nai_len, const char *imsi,
 511                           char prefix)
 512 {
 513         const char *sep, *msin;
 514         char *end, *pos;
 515         size_t msin_len, plmn_len;
 516
 517         /*
 518          * TS 23.003, Clause 14 (3GPP to WLAN Interworking)
 519          * Root NAI:
 520          * <aka:0|sim:1><IMSI>@wlan.mnc<MNC>.mcc<MCC>.3gppnetwork.org
 521          * <MNC> is zero-padded to three digits in case two-digit MNC is used
 522          */
 523
 524         if (imsi == NULL || os_strlen(imsi) > 16) {
 525                 wpa_printf(MSG_DEBUG, "No valid IMSI available");
 526                 return -1;
 527         }
 528         sep = os_strchr(imsi, '-');
 529         if (sep == NULL)
 530                 return -1;
 531         plmn_len = sep - imsi;
 532         if (plmn_len != 5 && plmn_len != 6)
 533                 return -1;
 534         msin = sep + 1;
 535         msin_len = os_strlen(msin);
 536
 537         pos = nai;
 538         end = nai + nai_len;
 539         if (prefix)
 540                 *pos++ = prefix;
 541         os_memcpy(pos, imsi, plmn_len);
 542         pos += plmn_len;
 543         os_memcpy(pos, msin, msin_len);
 544         pos += msin_len;
 545         pos += os_snprintf(pos, end - pos, "@wlan.mnc");
 546         if (plmn_len == 5) {
 547                 *pos++ = '0';
 548                 *pos++ = imsi[3];
 549                 *pos++ = imsi[4];
 550         } else {
 551                 *pos++ = imsi[3];
 552                 *pos++ = imsi[4];
 553                 *pos++ = imsi[5];
 554         }
 555         pos += os_snprintf(pos, end - pos, ".mcc%c%c%c.3gppnetwork.org",
 556                            imsi[0], imsi[1], imsi[2]);
 557
 558         return 0;
 559 }
 560
 561
 562 static int set_root_nai(struct wpa_ssid *ssid, const char *imsi, char prefix)
 563 {
 564         char nai[100];
 565         if (build_root_nai(nai, sizeof(nai), imsi, prefix) < 0)
 566                 return -1;
 567         return wpa_config_set_quoted(ssid, "identity", nai);
 568 }
 569
 570 #endif /* INTERWORKING_3GPP */
 571
 572
 573 static int interworking_connect_3gpp(struct wpa_supplicant *wpa_s,
 574                                      struct wpa_bss *bss)
 575 {
 576 #ifdef INTERWORKING_3GPP
 577         struct wpa_cred *cred;
 578         struct wpa_ssid *ssid;
 579         const u8 *ie;
 580
 581         if (bss->anqp_3gpp == NULL)
 582                 return -1;
 583
 584         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 585                 if (cred->imsi == NULL || !cred->imsi[0] ||
 586                     cred->milenage == NULL || !cred->milenage[0])
 587                         continue;
 588                 if (plmn_id_match(bss->anqp_3gpp, cred->imsi))
 589                         break;
 590         }
 591         if (cred == NULL)
 592                 return -1;
 593
 594         ie = wpa_bss_get_ie(bss, WLAN_EID_SSID);
 595         if (ie == NULL)
 596                 return -1;
 597         wpa_printf(MSG_DEBUG, "Interworking: Connect with " MACSTR " (3GPP)",
 598                    MAC2STR(bss->bssid));
 599
 600         ssid = wpa_config_add_network(wpa_s->conf);
 601         if (ssid == NULL)
 602                 return -1;
 603
 604         wpas_notify_network_added(wpa_s, ssid);
 605         wpa_config_set_network_defaults(ssid);
 606         ssid->priority = cred->priority;
 607         ssid->temporary = 1;
 608         ssid->ssid = os_zalloc(ie[1] + 1);
 609         if (ssid->ssid == NULL)
 610                 goto fail;
 611         os_memcpy(ssid->ssid, ie + 2, ie[1]);
 612         ssid->ssid_len = ie[1];
 613
 614         /* TODO: figure out whether to use EAP-SIM, EAP-AKA, or EAP-AKA' */
 615         if (wpa_config_set(ssid, "eap", "SIM", 0) < 0) {
 616                 wpa_printf(MSG_DEBUG, "EAP-SIM not supported");
 617                 goto fail;
 618         }
 619         if (set_root_nai(ssid, cred->imsi, '1') < 0) {
 620                 wpa_printf(MSG_DEBUG, "Failed to set Root NAI");
 621                 goto fail;
 622         }
 623
 624         if (cred->milenage && cred->milenage[0]) {
 625                 if (wpa_config_set_quoted(ssid, "password",
 626                                           cred->milenage) < 0)
 627                         goto fail;
 628         } else {
 629                 /* TODO: PIN */
 630                 if (wpa_config_set_quoted(ssid, "pcsc", "") < 0)
 631                         goto fail;
 632         }
 633
 634         if (cred->password && cred->password[0] &&
 635             wpa_config_set_quoted(ssid, "password", cred->password) < 0)
 636                 goto fail;
 637
 638         wpa_config_update_prio_list(wpa_s->conf);
 639         wpa_s->disconnected = 0;
 640         wpa_s->reassociate = 1;
 641         wpa_supplicant_req_scan(wpa_s, 0, 0);
 642
 643         return 0;
 644
 645 fail:
 646         wpas_notify_network_removed(wpa_s, ssid);
 647         wpa_config_remove_network(wpa_s->conf, ssid->id);
 648 #endif /* INTERWORKING_3GPP */
 649         return -1;
 650 }
 651
 652
 653 int interworking_connect(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 654 {
 655         struct wpa_cred *cred;
 656         struct wpa_ssid *ssid;
 657         struct nai_realm *realm;
 658         struct nai_realm_eap *eap = NULL;
 659         u16 count, i;
 660         char buf[100];
 661         const u8 *ie;
 662
 663         if (wpa_s->conf->cred == NULL || bss == NULL)
 664                 return -1;
 665         ie = wpa_bss_get_ie(bss, WLAN_EID_SSID);
 666         if (ie == NULL || ie[1] == 0) {
 667                 wpa_printf(MSG_DEBUG, "Interworking: No SSID known for "
 668                            MACSTR, MAC2STR(bss->bssid));
 669                 return -1;
 670         }
 671
 672         realm = nai_realm_parse(bss->anqp_nai_realm, &count);
 673         if (realm == NULL) {
 674                 wpa_printf(MSG_DEBUG, "Interworking: Could not parse NAI "
 675                            "Realm list from " MACSTR, MAC2STR(bss->bssid));
 676                 count = 0;
 677         }
 678
 679         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 680                 for (i = 0; i < count; i++) {
 681                         if (!nai_realm_match(&realm[i], cred->realm))
 682                                 continue;
 683                         eap = nai_realm_find_eap(cred, &realm[i]);
 684                         if (eap)
 685                                 break;
 686                 }
 687                 if (eap)
 688                         break;
 689         }
 690
 691         if (!eap) {
 692                 if (interworking_connect_3gpp(wpa_s, bss) == 0) {
 693                         if (realm)
 694                                 nai_realm_free(realm, count);
 695                         return 0;
 696                 }
 697
 698                 wpa_printf(MSG_DEBUG, "Interworking: No matching credentials "
 699                            "and EAP method found for " MACSTR,
 700                            MAC2STR(bss->bssid));
 701                 nai_realm_free(realm, count);
 702                 return -1;
 703         }
 704
 705         wpa_printf(MSG_DEBUG, "Interworking: Connect with " MACSTR,
 706                    MAC2STR(bss->bssid));
 707
 708         ssid = wpa_config_add_network(wpa_s->conf);
 709         if (ssid == NULL) {
 710                 nai_realm_free(realm, count);
 711                 return -1;
 712         }
 713         wpas_notify_network_added(wpa_s, ssid);
 714         wpa_config_set_network_defaults(ssid);
 715         ssid->priority = cred->priority;
 716         ssid->temporary = 1;
 717         ssid->ssid = os_zalloc(ie[1] + 1);
 718         if (ssid->ssid == NULL)
 719                 goto fail;
 720         os_memcpy(ssid->ssid, ie + 2, ie[1]);
 721         ssid->ssid_len = ie[1];
 722
 723         if (wpa_config_set(ssid, "eap", eap_get_name(EAP_VENDOR_IETF,
 724                                                      eap->method), 0) < 0)
 725                 goto fail;
 726
 727         if (eap->method == EAP_TYPE_TTLS &&
 728             cred->username && cred->username[0]) {
 729                 const char *pos;
 730                 char *anon;
 731                 /* Use anonymous NAI in Phase 1 */
 732                 pos = os_strchr(cred->username, '@');
 733                 if (pos) {
 734                         size_t buflen = 9 + os_strlen(pos) + 1;
 735                         anon = os_malloc(buflen);
 736                         if (anon == NULL)
 737                                 goto fail;
 738                         os_snprintf(anon, buflen, "anonymous%s", pos);
 739                 } else {
 740                         anon = os_strdup("anonymous");
 741                         if (anon == NULL)
 742                                 goto fail;
 743                 }
 744                 if (wpa_config_set_quoted(ssid, "anonymous_identity", anon) <
 745                     0) {
 746                         os_free(anon);
 747                         goto fail;
 748                 }
 749                 os_free(anon);
 750         }
 751
 752         if (cred->username && cred->username[0] &&
 753             wpa_config_set_quoted(ssid, "identity", cred->username) < 0)
 754                 goto fail;
 755
 756         if (cred->password && cred->password[0] &&
 757             wpa_config_set_quoted(ssid, "password", cred->password) < 0)
 758                 goto fail;
 759
 760         switch (eap->method) {
 761         case EAP_TYPE_TTLS:
 762                 if (eap->inner_method) {
 763                         os_snprintf(buf, sizeof(buf), "\"autheap=%s\"",
 764                                     eap_get_name(EAP_VENDOR_IETF,
 765                                                  eap->inner_method));
 766                         if (wpa_config_set(ssid, "phase2", buf, 0) < 0)
 767                                 goto fail;
 768                         break;
 769                 }
 770                 switch (eap->inner_non_eap) {
 771                 case NAI_REALM_INNER_NON_EAP_PAP:
 772                         if (wpa_config_set(ssid, "phase2", "\"auth=PAP\"", 0) <
 773                             0)
 774                                 goto fail;
 775                         break;
 776                 case NAI_REALM_INNER_NON_EAP_CHAP:
 777                         if (wpa_config_set(ssid, "phase2", "\"auth=CHAP\"", 0)
 778                             < 0)
 779                                 goto fail;
 780                         break;
 781                 case NAI_REALM_INNER_NON_EAP_MSCHAP:
 782                         if (wpa_config_set(ssid, "phase2", "\"auth=MSCHAP\"",
 783                                            0) < 0)
 784                                 goto fail;
 785                         break;
 786                 case NAI_REALM_INNER_NON_EAP_MSCHAPV2:
 787                         if (wpa_config_set(ssid, "phase2", "\"auth=MSCHAPV2\"",
 788                                            0) < 0)
 789                                 goto fail;
 790                         break;
 791                 }
 792                 break;
 793         case EAP_TYPE_PEAP:
 794                 os_snprintf(buf, sizeof(buf), "\"auth=%s\"",
 795                             eap_get_name(EAP_VENDOR_IETF, eap->inner_method));
 796                 if (wpa_config_set(ssid, "phase2", buf, 0) < 0)
 797                         goto fail;
 798                 break;
 799         }
 800
 801         if (cred->ca_cert && cred->ca_cert[0] &&
 802             wpa_config_set_quoted(ssid, "ca_cert", cred->ca_cert) < 0)
 803                 goto fail;
 804
 805         nai_realm_free(realm, count);
 806
 807         wpa_config_update_prio_list(wpa_s->conf);
 808         wpa_s->disconnected = 0;
 809         wpa_s->reassociate = 1;
 810         wpa_supplicant_req_scan(wpa_s, 0, 0);
 811
 812         return 0;
 813
 814 fail:
 815         wpas_notify_network_removed(wpa_s, ssid);
 816         wpa_config_remove_network(wpa_s->conf, ssid->id);
 817         nai_realm_free(realm, count);
 818         return -1;
 819 }
 820
 821
 822 static struct wpa_cred * interworking_credentials_available_3gpp(
 823         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 824 {
 825         struct wpa_cred *cred, *selected = NULL;
 826         int ret;
 827
 828 #ifdef INTERWORKING_3GPP
 829         if (bss->anqp_3gpp == NULL)
 830                 return NULL;
 831
 832         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 833                 if (cred->imsi == NULL || !cred->imsi[0] ||
 834                     cred->milenage == NULL || !cred->milenage[0])
 835                         continue;
 836
 837                 wpa_printf(MSG_DEBUG, "Interworking: Parsing 3GPP info from "
 838                            MACSTR, MAC2STR(bss->bssid));
 839                 ret = plmn_id_match(bss->anqp_3gpp, cred->imsi);
 840                 wpa_printf(MSG_DEBUG, "PLMN match %sfound", ret ? "" : "not ");
 841                 if (ret) {
 842                         if (selected == NULL ||
 843                             selected->priority < cred->priority)
 844                                 selected = cred;
 845                 }
 846         }
 847 #endif /* INTERWORKING_3GPP */
 848         return selected;
 849 }
 850
 851
 852 static struct wpa_cred * interworking_credentials_available_realm(
 853         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 854 {
 855         struct wpa_cred *cred, *selected = NULL;
 856         struct nai_realm *realm;
 857         u16 count, i;
 858
 859         if (bss->anqp_nai_realm == NULL)
 860                 return NULL;
 861
 862         if (wpa_s->conf->cred == NULL)
 863                 return NULL;
 864
 865         wpa_printf(MSG_DEBUG, "Interworking: Parsing NAI Realm list from "
 866                    MACSTR, MAC2STR(bss->bssid));
 867         realm = nai_realm_parse(bss->anqp_nai_realm, &count);
 868         if (realm == NULL) {
 869                 wpa_printf(MSG_DEBUG, "Interworking: Could not parse NAI "
 870                            "Realm list from " MACSTR, MAC2STR(bss->bssid));
 871                 return NULL;
 872         }
 873
 874         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 875                 if (cred->realm == NULL)
 876                         continue;
 877
 878                 for (i = 0; i < count; i++) {
 879                         if (!nai_realm_match(&realm[i], cred->realm))
 880                                 continue;
 881                         if (nai_realm_find_eap(cred, &realm[i])) {
 882                                 if (selected == NULL ||
 883                                     selected->priority < cred->priority)
 884                                         selected = cred;
 885                                 break;
 886                         }
 887                 }
 888         }
 889
 890         nai_realm_free(realm, count);
 891
 892         return selected;
 893 }
 894
 895
 896 static struct wpa_cred * interworking_credentials_available(
 897         struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 898 {
 899         struct wpa_cred *cred, *cred2;
 900
 901         cred = interworking_credentials_available_realm(wpa_s, bss);
 902         cred2 = interworking_credentials_available_3gpp(wpa_s, bss);
 903         if (cred && cred2 && cred2->priority >= cred->priority)
 904                 cred = cred2;
 905         if (!cred)
 906                 cred = cred2;
 907
 908         return cred;
 909 }
 910
 911
 912 static int domain_name_list_contains(struct wpabuf *domain_names,
 913                                      const char *domain)
 914 {
 915         const u8 *pos, *end;
 916         size_t len;
 917
 918         len = os_strlen(domain);
 919         pos = wpabuf_head(domain_names);
 920         end = pos + wpabuf_len(domain_names);
 921
 922         while (pos + 1 < end) {
 923                 if (pos + 1 + pos[0] > end)
 924                         break;
 925
 926                 wpa_hexdump_ascii(MSG_DEBUG, "Interworking: AP domain name",
 927                                   pos + 1, pos[0]);
 928                 if (pos[0] == len &&
 929                     os_strncasecmp(domain, (const char *) (pos + 1), len) == 0)
 930                         return 1;
 931
 932                 pos += 1 + pos[0];
 933         }
 934
 935         return 0;
 936 }
 937
 938
 939 static int interworking_home_sp(struct wpa_supplicant *wpa_s,
 940                                 struct wpabuf *domain_names)
 941 {
 942         struct wpa_cred *cred;
 943 #ifdef INTERWORKING_3GPP
 944         char nai[100], *realm;
 945 #endif /* INTERWORKING_3GPP */
 946
 947         if (domain_names == NULL || wpa_s->conf->cred == NULL)
 948                 return -1;
 949
 950         for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
 951 #ifdef INTERWORKING_3GPP
 952                 if (cred->imsi &&
 953                     build_root_nai(nai, sizeof(nai), cred->imsi, 0) == 0) {
 954                         realm = os_strchr(nai, '@');
 955                         if (realm)
 956                                 realm++;
 957                         wpa_printf(MSG_DEBUG, "Interworking: Search for match "
 958                                    "with SIM/USIM domain %s", realm);
 959                         if (realm &&
 960                             domain_name_list_contains(domain_names, realm))
 961                                 return 1;
 962                 }
 963 #endif /* INTERWORKING_3GPP */
 964
 965                 if (cred->domain == NULL)
 966                         continue;
 967
 968                 wpa_printf(MSG_DEBUG, "Interworking: Search for match with "
 969                            "home SP FQDN %s", cred->domain);
 970                 if (domain_name_list_contains(domain_names, cred->domain))
 971                         return 1;
 972         }
 973
 974         return 0;
 975 }
 976
 977
 978 static int interworking_find_network_match(struct wpa_supplicant *wpa_s)
 979 {
 980         struct wpa_bss *bss;
 981         struct wpa_ssid *ssid;
 982
 983         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
 984                 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 985                         if (ssid->disabled || ssid->mode != WPAS_MODE_INFRA)
 986                                 continue;
 987                         if (ssid->ssid_len != bss->ssid_len ||
 988                             os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) !=
 989                             0)
 990                                 continue;
 991                         /*
 992                          * TODO: Consider more accurate matching of security
 993                          * configuration similarly to what is done in events.c
 994                          */
 995                         return 1;
 996                 }
 997         }
 998
 999         return 0;
1000 }
1001
1002
1003 static void interworking_select_network(struct wpa_supplicant *wpa_s)
1004 {
1005         struct wpa_bss *bss, *selected = NULL, *selected_home = NULL;
1006         int selected_prio = -999999, selected_home_prio = -999999;
1007         unsigned int count = 0;
1008         const char *type;
1009         int res;
1010         struct wpa_cred *cred;
1011
1012         wpa_s->network_select = 0;
1013
1014         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
1015                 cred = interworking_credentials_available(wpa_s, bss);
1016                 if (!cred)
1017                         continue;
1018                 count++;
1019                 res = interworking_home_sp(wpa_s, bss->anqp_domain_name);
1020                 if (res > 0)
1021                         type = "home";
1022                 else if (res == 0)
1023                         type = "roaming";
1024                 else
1025                         type = "unknown";
1026                 wpa_msg(wpa_s, MSG_INFO, INTERWORKING_AP MACSTR " type=%s",
1027                         MAC2STR(bss->bssid), type);
1028                 if (wpa_s->auto_select) {
1029                         if (selected == NULL ||
1030                             cred->priority > selected_prio) {
1031                                 selected = bss;
1032                                 selected_prio = cred->priority;
1033                         }
1034                         if (res > 0 &&
1035                             (selected_home == NULL ||
1036                              cred->priority > selected_home_prio)) {
1037                                 selected_home = bss;
1038                                 selected_home_prio = cred->priority;
1039                         }
1040                 }
1041         }
1042
1043         if (selected_home && selected_home != selected &&
1044             selected_home_prio >= selected_prio) {
1045                 /* Prefer network operated by the Home SP */
1046                 selected = selected_home;
1047         }
1048
1049         if (count == 0) {
1050                 /*
1051                  * No matching network was found based on configured
1052                  * credentials. Check whether any of the enabled network blocks
1053                  * have matching APs.
1054                  */
1055                 if (interworking_find_network_match(wpa_s)) {
1056                         wpa_printf(MSG_DEBUG, "Interworking: Possible BSS "
1057                                    "match for enabled network configurations");
1058                         wpa_s->disconnected = 0;
1059                         wpa_s->reassociate = 1;
1060                         wpa_supplicant_req_scan(wpa_s, 0, 0);
1061                         return;
1062                 }
1063
1064                 wpa_msg(wpa_s, MSG_INFO, INTERWORKING_NO_MATCH "No network "
1065                         "with matching credentials found");
1066         }
1067
1068         if (selected)
1069                 interworking_connect(wpa_s, selected);
1070 }
1071
1072
1073 static void interworking_next_anqp_fetch(struct wpa_supplicant *wpa_s)
1074 {
1075         struct wpa_bss *bss;
1076         int found = 0;
1077         const u8 *ie;
1078
1079         if (!wpa_s->fetch_anqp_in_progress)
1080                 return;
1081
1082         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
1083                 if (!(bss->caps & IEEE80211_CAP_ESS))
1084                         continue;
1085                 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_CAPAB);
1086                 if (ie == NULL || ie[1] < 4 || !(ie[5] & 0x80))
1087                         continue; /* AP does not support Interworking */
1088
1089                 if (!(bss->flags & WPA_BSS_ANQP_FETCH_TRIED)) {
1090                         found++;
1091                         bss->flags |= WPA_BSS_ANQP_FETCH_TRIED;
1092                         wpa_msg(wpa_s, MSG_INFO, "Starting ANQP fetch for "
1093                                 MACSTR, MAC2STR(bss->bssid));
1094                         interworking_anqp_send_req(wpa_s, bss);
1095                         break;
1096                 }
1097         }
1098
1099         if (found == 0) {
1100                 wpa_msg(wpa_s, MSG_INFO, "ANQP fetch completed");
1101                 wpa_s->fetch_anqp_in_progress = 0;
1102                 if (wpa_s->network_select)
1103                         interworking_select_network(wpa_s);
1104         }
1105 }
1106
1107
1108 static void interworking_start_fetch_anqp(struct wpa_supplicant *wpa_s)
1109 {
1110         struct wpa_bss *bss;
1111
1112         dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list)
1113                 bss->flags &= ~WPA_BSS_ANQP_FETCH_TRIED;
1114
1115         wpa_s->fetch_anqp_in_progress = 1;
1116         interworking_next_anqp_fetch(wpa_s);
1117 }
1118
1119
1120 int interworking_fetch_anqp(struct wpa_supplicant *wpa_s)
1121 {
1122         if (wpa_s->fetch_anqp_in_progress || wpa_s->network_select)
1123                 return 0;
1124
1125         wpa_s->network_select = 0;
1126
1127         interworking_start_fetch_anqp(wpa_s);
1128
1129         return 0;
1130 }
1131
1132
1133 void interworking_stop_fetch_anqp(struct wpa_supplicant *wpa_s)
1134 {
1135         if (!wpa_s->fetch_anqp_in_progress)
1136                 return;
1137
1138         wpa_s->fetch_anqp_in_progress = 0;
1139 }
1140
1141
1142 int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
1143                   u16 info_ids[], size_t num_ids)
1144 {
1145         struct wpabuf *buf;
1146         int ret = 0;
1147         int freq;
1148         struct wpa_bss *bss;
1149         int res;
1150
1151         freq = wpa_s->assoc_freq;
1152         bss = wpa_bss_get_bssid(wpa_s, dst);
1153         if (bss)
1154                 freq = bss->freq;
1155         if (freq <= 0)
1156                 return -1;
1157
1158         wpa_printf(MSG_DEBUG, "ANQP: Query Request to " MACSTR " for %u id(s)",
1159                    MAC2STR(dst), (unsigned int) num_ids);
1160
1161         buf = anqp_build_req(info_ids, num_ids, NULL);
1162         if (buf == NULL)
1163                 return -1;
1164
1165         res = gas_query_req(wpa_s->gas, dst, freq, buf, anqp_resp_cb, wpa_s);
1166         if (res < 0) {
1167                 wpa_printf(MSG_DEBUG, "ANQP: Failed to send Query Request");
1168                 ret = -1;
1169         } else
1170                 wpa_printf(MSG_DEBUG, "ANQP: Query started with dialog token "
1171                            "%u", res);
1172
1173         wpabuf_free(buf);
1174         return ret;
1175 }
1176
1177
1178 static void interworking_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
1179                                             const u8 *sa, u16 info_id,
1180                                             const u8 *data, size_t slen)
1181 {
1182         const u8 *pos = data;
1183         struct wpa_bss *bss = wpa_bss_get_bssid(wpa_s, sa);
1184
1185         switch (info_id) {
1186         case ANQP_CAPABILITY_LIST:
1187                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1188                         " ANQP Capability list", MAC2STR(sa));
1189                 break;
1190         case ANQP_VENUE_NAME:
1191                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1192                         " Venue Name", MAC2STR(sa));
1193                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Venue Name", pos, slen);
1194                 if (bss) {
1195                         wpabuf_free(bss->anqp_venue_name);
1196                         bss->anqp_venue_name = wpabuf_alloc_copy(pos, slen);
1197                 }
1198                 break;
1199         case ANQP_NETWORK_AUTH_TYPE:
1200                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1201                         " Network Authentication Type information",
1202                         MAC2STR(sa));
1203                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Network Authentication "
1204                                   "Type", pos, slen);
1205                 if (bss) {
1206                         wpabuf_free(bss->anqp_network_auth_type);
1207                         bss->anqp_network_auth_type =
1208                                 wpabuf_alloc_copy(pos, slen);
1209                 }
1210                 break;
1211         case ANQP_ROAMING_CONSORTIUM:
1212                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1213                         " Roaming Consortium list", MAC2STR(sa));
1214                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Roaming Consortium",
1215                                   pos, slen);
1216                 if (bss) {
1217                         wpabuf_free(bss->anqp_roaming_consortium);
1218                         bss->anqp_roaming_consortium =
1219                                 wpabuf_alloc_copy(pos, slen);
1220                 }
1221                 break;
1222         case ANQP_IP_ADDR_TYPE_AVAILABILITY:
1223                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1224                         " IP Address Type Availability information",
1225                         MAC2STR(sa));
1226                 wpa_hexdump(MSG_MSGDUMP, "ANQP: IP Address Availability",
1227                             pos, slen);
1228                 if (bss) {
1229                         wpabuf_free(bss->anqp_ip_addr_type_availability);
1230                         bss->anqp_ip_addr_type_availability =
1231                                 wpabuf_alloc_copy(pos, slen);
1232                 }
1233                 break;
1234         case ANQP_NAI_REALM:
1235                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1236                         " NAI Realm list", MAC2STR(sa));
1237                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: NAI Realm", pos, slen);
1238                 if (bss) {
1239                         wpabuf_free(bss->anqp_nai_realm);
1240                         bss->anqp_nai_realm = wpabuf_alloc_copy(pos, slen);
1241                 }
1242                 break;
1243         case ANQP_3GPP_CELLULAR_NETWORK:
1244                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1245                         " 3GPP Cellular Network information", MAC2STR(sa));
1246                 wpa_hexdump_ascii(MSG_DEBUG, "ANQP: 3GPP Cellular Network",
1247                                   pos, slen);
1248                 if (bss) {
1249                         wpabuf_free(bss->anqp_3gpp);
1250                         bss->anqp_3gpp = wpabuf_alloc_copy(pos, slen);
1251                 }
1252                 break;
1253         case ANQP_DOMAIN_NAME:
1254                 wpa_msg(wpa_s, MSG_INFO, "RX-ANQP " MACSTR
1255                         " Domain Name list", MAC2STR(sa));
1256                 wpa_hexdump_ascii(MSG_MSGDUMP, "ANQP: Domain Name", pos, slen);
1257                 if (bss) {
1258                         wpabuf_free(bss->anqp_domain_name);
1259                         bss->anqp_domain_name = wpabuf_alloc_copy(pos, slen);
1260                 }
1261                 break;
1262         case ANQP_VENDOR_SPECIFIC:
1263                 if (slen < 3)
1264                         return;
1265
1266                 switch (WPA_GET_BE24(pos)) {
1267                 default:
1268                         wpa_printf(MSG_DEBUG, "Interworking: Unsupported "
1269                                    "vendor-specific ANQP OUI %06x",
1270                                    WPA_GET_BE24(pos));
1271                         return;
1272                 }
1273                 break;
1274         default:
1275                 wpa_printf(MSG_DEBUG, "Interworking: Unsupported ANQP Info ID "
1276                            "%u", info_id);
1277                 break;
1278         }
1279 }
1280
1281
1282 void anqp_resp_cb(void *ctx, const u8 *dst, u8 dialog_token,
1283                   enum gas_query_result result,
1284                   const struct wpabuf *adv_proto,
1285                   const struct wpabuf *resp, u16 status_code)
1286 {
1287         struct wpa_supplicant *wpa_s = ctx;
1288         const u8 *pos;
1289         const u8 *end;
1290         u16 info_id;
1291         u16 slen;
1292
1293         if (result != GAS_QUERY_SUCCESS)
1294                 return;
1295
1296         pos = wpabuf_head(adv_proto);
1297         if (wpabuf_len(adv_proto) < 4 || pos[0] != WLAN_EID_ADV_PROTO ||
1298             pos[1] < 2 || pos[3] != ACCESS_NETWORK_QUERY_PROTOCOL) {
1299                 wpa_printf(MSG_DEBUG, "ANQP: Unexpected Advertisement "
1300                            "Protocol in response");
1301                 return;
1302         }
1303
1304         pos = wpabuf_head(resp);
1305         end = pos + wpabuf_len(resp);
1306
1307         while (pos < end) {
1308                 if (pos + 4 > end) {
1309                         wpa_printf(MSG_DEBUG, "ANQP: Invalid element");
1310                         break;
1311                 }
1312                 info_id = WPA_GET_LE16(pos);
1313                 pos += 2;
1314                 slen = WPA_GET_LE16(pos);
1315                 pos += 2;
1316                 if (pos + slen > end) {
1317                         wpa_printf(MSG_DEBUG, "ANQP: Invalid element length "
1318                                    "for Info ID %u", info_id);
1319                         break;
1320                 }
1321                 interworking_parse_rx_anqp_resp(wpa_s, dst, info_id, pos,
1322                                                 slen);
1323                 pos += slen;
1324         }
1325 }
1326
1327
1328 static void interworking_scan_res_handler(struct wpa_supplicant *wpa_s,
1329                                           struct wpa_scan_results *scan_res)
1330 {
1331         wpa_printf(MSG_DEBUG, "Interworking: Scan results available - start "
1332                    "ANQP fetch");
1333         interworking_start_fetch_anqp(wpa_s);
1334 }
1335
1336
1337 int interworking_select(struct wpa_supplicant *wpa_s, int auto_select)
1338 {
1339         interworking_stop_fetch_anqp(wpa_s);
1340         wpa_s->network_select = 1;
1341         wpa_s->auto_select = !!auto_select;
1342         wpa_printf(MSG_DEBUG, "Interworking: Start scan for network "
1343                    "selection");
1344         wpa_s->scan_res_handler = interworking_scan_res_handler;
1345         wpa_s->scan_req = 2;
1346         wpa_supplicant_req_scan(wpa_s, 0, 0);
1347
1348         return 0;
1349 }