/src/hostap/wpa_supplicant/interworking.c

Source (jump to first uncovered line)
/*
 * Interworking (IEEE 802.11u)
 * Copyright (c) 2011-2013, Qualcomm Atheros, Inc.
 * Copyright (c) 2011-2014, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "includes.h"

#include "common.h"
#include "common/ieee802_11_defs.h"
#include "common/gas.h"
#include "common/wpa_ctrl.h"
#include "utils/pcsc_funcs.h"
#include "utils/eloop.h"
#include "drivers/driver.h"
#include "eap_common/eap_defs.h"
#include "eap_peer/eap.h"
#include "eap_peer/eap_methods.h"
#include "eapol_supp/eapol_supp_sm.h"
#include "rsn_supp/wpa.h"
#include "wpa_supplicant_i.h"
#include "config.h"
#include "config_ssid.h"
#include "bss.h"
#include "scan.h"
#include "notify.h"
#include "driver_i.h"
#include "gas_query.h"
#include "hs20_supplicant.h"
#include "interworking.h"


#if defined(EAP_SIM) | defined(EAP_SIM_DYNAMIC)
#define INTERWORKING_3GPP
#else
#if defined(EAP_AKA) | defined(EAP_AKA_DYNAMIC)
#define INTERWORKING_3GPP
#else
#if defined(EAP_AKA_PRIME) | defined(EAP_AKA_PRIME_DYNAMIC)
#define INTERWORKING_3GPP
#endif
#endif
#endif

static void interworking_next_anqp_fetch(struct wpa_supplicant *wpa_s);
static struct wpa_cred * interworking_credentials_available_realm(
  struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw,
  int *excluded);
static struct wpa_cred * interworking_credentials_available_3gpp(
  struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw,
  int *excluded);


static int cred_prio_cmp(const struct wpa_cred *a, const struct wpa_cred *b)
{
  if (a->priority > b->priority)
    return 1;
  if (a->priority < b->priority)
    return -1;
  if (a->provisioning_sp == NULL || b->provisioning_sp == NULL ||
      os_strcmp(a->provisioning_sp, b->provisioning_sp) != 0)
    return 0;
  if (a->sp_priority < b->sp_priority)
    return 1;
  if (a->sp_priority > b->sp_priority)
    return -1;
  return 0;
}


static void interworking_reconnect(struct wpa_supplicant *wpa_s)
{
  unsigned int tried;

  if (wpa_s->wpa_state >= WPA_AUTHENTICATING) {
    wpa_supplicant_cancel_sched_scan(wpa_s);
    wpa_s->own_disconnect_req = 1;
    wpa_supplicant_deauthenticate(wpa_s,
                WLAN_REASON_DEAUTH_LEAVING);
  }
  wpa_s->disconnected = 0;
  wpa_s->reassociate = 1;
  tried = wpa_s->interworking_fast_assoc_tried;
  wpa_s->interworking_fast_assoc_tried = 1;

  if (!tried && wpa_supplicant_fast_associate(wpa_s) >= 0)
    return;

  wpa_s->interworking_fast_assoc_tried = 0;
  wpa_supplicant_req_scan(wpa_s, 0, 0);
}


static struct wpabuf * anqp_build_req(u16 info_ids[], size_t num_ids,
              struct wpabuf *extra)
{
  struct wpabuf *buf;
  size_t i;
  u8 *len_pos;

  buf = gas_anqp_build_initial_req(0, 4 + num_ids * 2 +
           (extra ? wpabuf_len(extra) : 0));
  if (buf == NULL)
    return NULL;

  if (num_ids > 0) {
    len_pos = gas_anqp_add_element(buf, ANQP_QUERY_LIST);
    for (i = 0; i < num_ids; i++)
      wpabuf_put_le16(buf, info_ids[i]);
    gas_anqp_set_element_len(buf, len_pos);
  }
  if (extra)
    wpabuf_put_buf(buf, extra);

  gas_anqp_set_len(buf);

  return buf;
}


static void interworking_anqp_resp_cb(void *ctx, const u8 *dst,
              u8 dialog_token,
              enum gas_query_result result,
              const struct wpabuf *adv_proto,
              const struct wpabuf *resp,
              u16 status_code)
{
  struct wpa_supplicant *wpa_s = ctx;

  wpa_printf(MSG_DEBUG, "ANQP: Response callback dst=" MACSTR
       " dialog_token=%u result=%d status_code=%u",
       MAC2STR(dst), dialog_token, result, status_code);
  anqp_resp_cb(wpa_s, dst, dialog_token, result, adv_proto, resp,
         status_code);
  interworking_next_anqp_fetch(wpa_s);
}


static int cred_with_roaming_consortium(struct wpa_supplicant *wpa_s)
{
  struct wpa_cred *cred;

  for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
    if (cred->num_home_ois)
      return 1;
    if (cred->num_required_home_ois)
      return 1;
    if (cred->num_roaming_consortiums)
      return 1;
  }
  return 0;
}


static int cred_with_3gpp(struct wpa_supplicant *wpa_s)
{
  struct wpa_cred *cred;

  for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
    if (cred->pcsc || cred->imsi)
      return 1;
  }
  return 0;
}


static int cred_with_nai_realm(struct wpa_supplicant *wpa_s)
{
  struct wpa_cred *cred;

  for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
    if (cred->pcsc || cred->imsi)
      continue;
    if (!cred->eap_method)
      return 1;
    if (cred->realm)
      return 1;
  }
  return 0;
}


static int cred_with_domain(struct wpa_supplicant *wpa_s)
{
  struct wpa_cred *cred;

  for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
    if (cred->domain || cred->pcsc || cred->imsi ||
        cred->roaming_partner)
      return 1;
  }
  return 0;
}


#ifdef CONFIG_HS20

static int cred_with_min_backhaul(struct wpa_supplicant *wpa_s)
{
  struct wpa_cred *cred;

  for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
    if (cred->min_dl_bandwidth_home ||
        cred->min_ul_bandwidth_home ||
        cred->min_dl_bandwidth_roaming ||
        cred->min_ul_bandwidth_roaming)
      return 1;
  }
  return 0;
}


static int cred_with_conn_capab(struct wpa_supplicant *wpa_s)
{
  struct wpa_cred *cred;

  for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
    if (cred->num_req_conn_capab)
      return 1;
  }
  return 0;
}

#endif /* CONFIG_HS20 */


static int additional_roaming_consortiums(struct wpa_bss *bss)
{
  const u8 *ie;
  ie = wpa_bss_get_ie(bss, WLAN_EID_ROAMING_CONSORTIUM);
  if (ie == NULL || ie[1] == 0)
    return 0;
  return ie[2]; /* Number of ANQP OIs */
}


static void interworking_continue_anqp(void *eloop_ctx, void *sock_ctx)
{
  struct wpa_supplicant *wpa_s = eloop_ctx;
  interworking_next_anqp_fetch(wpa_s);
}


static int interworking_anqp_send_req(struct wpa_supplicant *wpa_s,
              struct wpa_bss *bss)
{
  struct wpabuf *buf;
  int ret = 0;
  int res;
  u16 info_ids[8];
  size_t num_info_ids = 0;
  struct wpabuf *extra = NULL;
  int all = wpa_s->fetch_all_anqp;

  wpa_msg(wpa_s, MSG_DEBUG, "Interworking: ANQP Query Request to " MACSTR,
    MAC2STR(bss->bssid));
  wpa_s->interworking_gas_bss = bss;

  info_ids[num_info_ids++] = ANQP_CAPABILITY_LIST;
  if (all) {
    info_ids[num_info_ids++] = ANQP_VENUE_NAME;
    info_ids[num_info_ids++] = ANQP_NETWORK_AUTH_TYPE;
  }
  if (all || (cred_with_roaming_consortium(wpa_s) &&
        additional_roaming_consortiums(bss)))
    info_ids[num_info_ids++] = ANQP_ROAMING_CONSORTIUM;
  if (all)
    info_ids[num_info_ids++] = ANQP_IP_ADDR_TYPE_AVAILABILITY;
  if (all || cred_with_nai_realm(wpa_s))
    info_ids[num_info_ids++] = ANQP_NAI_REALM;
  if (all || cred_with_3gpp(wpa_s)) {
    info_ids[num_info_ids++] = ANQP_3GPP_CELLULAR_NETWORK;
    wpa_supplicant_scard_init(wpa_s, NULL);
  }
  if (all || cred_with_domain(wpa_s))
    info_ids[num_info_ids++] = ANQP_DOMAIN_NAME;
  wpa_hexdump(MSG_DEBUG, "Interworking: ANQP Query info",
        (u8 *) info_ids, num_info_ids * 2);

#ifdef CONFIG_HS20
  if (wpa_bss_get_vendor_ie(bss, HS20_IE_VENDOR_TYPE)) {
    u8 *len_pos;

    extra = wpabuf_alloc(100);
    if (!extra)
      return -1;

    len_pos = gas_anqp_add_element(extra, ANQP_VENDOR_SPECIFIC);
    wpabuf_put_be24(extra, OUI_WFA);
    wpabuf_put_u8(extra, HS20_ANQP_OUI_TYPE);
    wpabuf_put_u8(extra, HS20_STYPE_QUERY_LIST);
    wpabuf_put_u8(extra, 0); /* Reserved */
    wpabuf_put_u8(extra, HS20_STYPE_CAPABILITY_LIST);
    if (all)
      wpabuf_put_u8(extra,
              HS20_STYPE_OPERATOR_FRIENDLY_NAME);
    if (all || cred_with_min_backhaul(wpa_s))
      wpabuf_put_u8(extra, HS20_STYPE_WAN_METRICS);
    if (all || cred_with_conn_capab(wpa_s))
      wpabuf_put_u8(extra, HS20_STYPE_CONNECTION_CAPABILITY);
    if (all)
      wpabuf_put_u8(extra, HS20_STYPE_OPERATING_CLASS);
    if (all) {
      wpabuf_put_u8(extra, HS20_STYPE_OSU_PROVIDERS_LIST);
      wpabuf_put_u8(extra, HS20_STYPE_OSU_PROVIDERS_NAI_LIST);
    }
    gas_anqp_set_element_len(extra, len_pos);
  }
#endif /* CONFIG_HS20 */

  buf = anqp_build_req(info_ids, num_info_ids, extra);
  wpabuf_free(extra);
  if (buf == NULL)
    return -1;

  res = gas_query_req(wpa_s->gas, bss->bssid, bss->freq, 0, 0, buf,
          interworking_anqp_resp_cb, wpa_s);
  if (res < 0) {
    wpa_msg(wpa_s, MSG_DEBUG, "ANQP: Failed to send Query Request");
    wpabuf_free(buf);
    ret = -1;
    eloop_register_timeout(0, 0, interworking_continue_anqp, wpa_s,
               NULL);
  } else
    wpa_msg(wpa_s, MSG_DEBUG,
      "ANQP: Query started with dialog token %u", res);

  return ret;
}


struct nai_realm_eap {
  u8 method;
  u8 inner_method;
  enum nai_realm_eap_auth_inner_non_eap inner_non_eap;
  u8 cred_type;
  u8 tunneled_cred_type;
};

struct nai_realm {
  u8 encoding;
  char *realm;
  u8 eap_count;
  struct nai_realm_eap *eap;
};


static void nai_realm_free(struct nai_realm *realms, u16 count)
{
  u16 i;

  if (realms == NULL)
    return;
  for (i = 0; i < count; i++) {
    os_free(realms[i].eap);
    os_free(realms[i].realm);
  }
  os_free(realms);
}


static const u8 * nai_realm_parse_eap(struct nai_realm_eap *e, const u8 *pos,
              const u8 *end)
{
  u8 elen, auth_count, a;
  const u8 *e_end;

  if (end - pos < 3) {
    wpa_printf(MSG_DEBUG, "No room for EAP Method fixed fields");
    return NULL;
  }

  elen = *pos++;
  if (elen > end - pos || elen < 2) {
    wpa_printf(MSG_DEBUG, "No room for EAP Method subfield");
    return NULL;
  }
  e_end = pos + elen;
  e->method = *pos++;
  auth_count = *pos++;
  wpa_printf(MSG_DEBUG, "EAP Method: len=%u method=%u auth_count=%u",
       elen, e->method, auth_count);

  for (a = 0; a < auth_count; a++) {
    u8 id, len;

    if (end - pos < 2) {
      wpa_printf(MSG_DEBUG,
           "No room for Authentication Parameter subfield header");
      return NULL;
    }

    id = *pos++;
    len = *pos++;
    if (len > end - pos) {
      wpa_printf(MSG_DEBUG,
           "No room for Authentication Parameter subfield");
      return NULL;
    }

    switch (id) {
    case NAI_REALM_EAP_AUTH_NON_EAP_INNER_AUTH:
      if (len < 1)
        break;
      e->inner_non_eap = *pos;
      if (e->method != EAP_TYPE_TTLS)
        break;
      switch (*pos) {
      case NAI_REALM_INNER_NON_EAP_PAP:
        wpa_printf(MSG_DEBUG, "EAP-TTLS/PAP");
        break;
      case NAI_REALM_INNER_NON_EAP_CHAP:
        wpa_printf(MSG_DEBUG, "EAP-TTLS/CHAP");
        break;
      case NAI_REALM_INNER_NON_EAP_MSCHAP:
        wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAP");
        break;
      case NAI_REALM_INNER_NON_EAP_MSCHAPV2:
        wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2");
        break;
      default:
        wpa_printf(MSG_DEBUG,
             "Unsupported EAP-TTLS inner method %u",
             *pos);
        break;
      }
      break;
    case NAI_REALM_EAP_AUTH_INNER_AUTH_EAP_METHOD:
      if (len < 1)
        break;
      e->inner_method = *pos;
      wpa_printf(MSG_DEBUG, "Inner EAP method: %u",
           e->inner_method);
      break;
    case NAI_REALM_EAP_AUTH_CRED_TYPE:
      if (len < 1)
        break;
      e->cred_type = *pos;
      wpa_printf(MSG_DEBUG, "Credential Type: %u",
           e->cred_type);
      break;
    case NAI_REALM_EAP_AUTH_TUNNELED_CRED_TYPE:
      if (len < 1)
        break;
      e->tunneled_cred_type = *pos;
      wpa_printf(MSG_DEBUG, "Tunneled EAP Method Credential "
           "Type: %u", e->tunneled_cred_type);
      break;
    default:
      wpa_printf(MSG_DEBUG, "Unsupported Authentication "
           "Parameter: id=%u len=%u", id, len);
      wpa_hexdump(MSG_DEBUG, "Authentication Parameter "
            "Value", pos, len);
      break;
    }

    pos += len;
  }

  return e_end;
}


static const u8 * nai_realm_parse_realm(struct nai_realm *r, const u8 *pos,
          const u8 *end)
{
  u16 len;
  const u8 *f_end;
  u8 realm_len, e;

  if (end - pos < 4) {
    wpa_printf(MSG_DEBUG, "No room for NAI Realm Data "
         "fixed fields");
    return NULL;
  }

  len = WPA_GET_LE16(pos); /* NAI Realm Data field Length */
  pos += 2;
  if (len > end - pos || len < 3) {
    wpa_printf(MSG_DEBUG, "No room for NAI Realm Data "
         "(len=%u; left=%u)",
         len, (unsigned int) (end - pos));
    return NULL;
  }
  f_end = pos + len;

  r->encoding = *pos++;
  realm_len = *pos++;
  if (realm_len > f_end - pos) {
    wpa_printf(MSG_DEBUG, "No room for NAI Realm "
         "(len=%u; left=%u)",
         realm_len, (unsigned int) (f_end - pos));
    return NULL;
  }
  wpa_hexdump_ascii(MSG_DEBUG, "NAI Realm", pos, realm_len);
  r->realm = dup_binstr(pos, realm_len);
  if (r->realm == NULL)
    return NULL;
  pos += realm_len;

  if (f_end - pos < 1) {
    wpa_printf(MSG_DEBUG, "No room for EAP Method Count");
    return NULL;
  }
  r->eap_count = *pos++;
  wpa_printf(MSG_DEBUG, "EAP Count: %u", r->eap_count);
  if (r->eap_count * 3 > f_end - pos) {
    wpa_printf(MSG_DEBUG, "No room for EAP Methods");
    return NULL;
  }
  r->eap = os_calloc(r->eap_count, sizeof(struct nai_realm_eap));
  if (r->eap == NULL)
    return NULL;

  for (e = 0; e < r->eap_count; e++) {
    pos = nai_realm_parse_eap(&r->eap[e], pos, f_end);
    if (pos == NULL)
      return NULL;
  }

  return f_end;
}


static struct nai_realm * nai_realm_parse(struct wpabuf *anqp, u16 *count)
{
  struct nai_realm *realm;
  const u8 *pos, *end;
  u16 i, num;
  size_t left;

  if (anqp == NULL)
    return NULL;
  left = wpabuf_len(anqp);
  if (left < 2)
    return NULL;

  pos = wpabuf_head_u8(anqp);
  end = pos + left;
  num = WPA_GET_LE16(pos);
  wpa_printf(MSG_DEBUG, "NAI Realm Count: %u", num);
  pos += 2;
  left -= 2;

  if (num > left / 5) {
    wpa_printf(MSG_DEBUG, "Invalid NAI Realm Count %u - not "
         "enough data (%u octets) for that many realms",
         num, (unsigned int) left);
    return NULL;
  }

  realm = os_calloc(num, sizeof(struct nai_realm));
  if (realm == NULL)
    return NULL;

  for (i = 0; i < num; i++) {
    pos = nai_realm_parse_realm(&realm[i], pos, end);
    if (pos == NULL) {
      nai_realm_free(realm, num);
      return NULL;
    }
  }

  *count = num;
  return realm;
}


static int nai_realm_match(struct nai_realm *realm, const char *home_realm)
{
  char *tmp, *pos, *end;
  int match = 0;

  if (realm->realm == NULL || home_realm == NULL)
    return 0;

  if (os_strchr(realm->realm, ';') == NULL)
    return os_strcasecmp(realm->realm, home_realm) == 0;

  tmp = os_strdup(realm->realm);
  if (tmp == NULL)
    return 0;

  pos = tmp;
  while (*pos) {
    end = os_strchr(pos, ';');
    if (end)
      *end = '\0';
    if (os_strcasecmp(pos, home_realm) == 0) {
      match = 1;
      break;
    }
    if (end == NULL)
      break;
    pos = end + 1;
  }

  os_free(tmp);

  return match;
}


static int nai_realm_cred_username(struct wpa_supplicant *wpa_s,
           struct nai_realm_eap *eap)
{
  if (eap_get_name(EAP_VENDOR_IETF, eap->method) == NULL) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "nai-realm-cred-username: EAP method not supported: %d",
      eap->method);
    return 0; /* method not supported */
  }

  if (eap->method != EAP_TYPE_TTLS && eap->method != EAP_TYPE_PEAP &&
      eap->method != EAP_TYPE_FAST) {
    /* Only tunneled methods with username/password supported */
    wpa_msg(wpa_s, MSG_DEBUG,
      "nai-realm-cred-username: Method: %d is not TTLS, PEAP, or FAST",
      eap->method);
    return 0;
  }

  if (eap->method == EAP_TYPE_PEAP || eap->method == EAP_TYPE_FAST) {
    if (eap->inner_method &&
        eap_get_name(EAP_VENDOR_IETF, eap->inner_method) == NULL) {
      wpa_msg(wpa_s, MSG_DEBUG,
        "nai-realm-cred-username: PEAP/FAST: Inner method not supported: %d",
        eap->inner_method);
      return 0;
    }
    if (!eap->inner_method &&
        eap_get_name(EAP_VENDOR_IETF, EAP_TYPE_MSCHAPV2) == NULL) {
      wpa_msg(wpa_s, MSG_DEBUG,
        "nai-realm-cred-username: MSCHAPv2 not supported");
      return 0;
    }
  }

  if (eap->method == EAP_TYPE_TTLS) {
    if (eap->inner_method == 0 && eap->inner_non_eap == 0)
      return 1; /* Assume TTLS/MSCHAPv2 is used */
    if (eap->inner_method &&
        eap_get_name(EAP_VENDOR_IETF, eap->inner_method) == NULL) {
      wpa_msg(wpa_s, MSG_DEBUG,
        "nai-realm-cred-username: TTLS, but inner not supported: %d",
        eap->inner_method);
      return 0;
    }
    if (eap->inner_non_eap &&
        eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_PAP &&
        eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_CHAP &&
        eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_MSCHAP &&
        eap->inner_non_eap != NAI_REALM_INNER_NON_EAP_MSCHAPV2) {
      wpa_msg(wpa_s, MSG_DEBUG,
        "nai-realm-cred-username: TTLS, inner-non-eap not supported: %d",
        eap->inner_non_eap);
      return 0;
    }
  }

  if (eap->inner_method &&
      eap->inner_method != EAP_TYPE_GTC &&
      eap->inner_method != EAP_TYPE_MSCHAPV2) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "nai-realm-cred-username: inner-method not GTC or MSCHAPv2: %d",
      eap->inner_method);
    return 0;
  }

  return 1;
}


static int nai_realm_cred_cert(struct wpa_supplicant *wpa_s,
             struct nai_realm_eap *eap)
{
  if (eap_get_name(EAP_VENDOR_IETF, eap->method) == NULL) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "nai-realm-cred-cert: Method not supported: %d",
      eap->method);
    return 0; /* method not supported */
  }

  if (eap->method != EAP_TYPE_TLS) {
    /* Only EAP-TLS supported for credential authentication */
    wpa_msg(wpa_s, MSG_DEBUG,
      "nai-realm-cred-cert: Method not TLS: %d",
      eap->method);
    return 0;
  }

  return 1;
}


static struct nai_realm_eap * nai_realm_find_eap(struct wpa_supplicant *wpa_s,
             struct wpa_cred *cred,
             struct nai_realm *realm)
{
  u8 e;

  if (cred->username == NULL ||
      cred->username[0] == '\0' ||
      ((cred->password == NULL ||
        cred->password[0] == '\0') &&
       (cred->private_key == NULL ||
        cred->private_key[0] == '\0') &&
       (!cred->key_id || cred->key_id[0] == '\0'))) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "nai-realm-find-eap: incomplete cred info: username: %s  password: %s private_key: %s key_id: %s",
      cred->username ? cred->username : "NULL",
      cred->password ? cred->password : "NULL",
      cred->private_key ? cred->private_key : "NULL",
      cred->key_id ? cred->key_id : "NULL");
    return NULL;
  }

  for (e = 0; e < realm->eap_count; e++) {
    struct nai_realm_eap *eap = &realm->eap[e];
    if (cred->password && cred->password[0] &&
        nai_realm_cred_username(wpa_s, eap))
      return eap;
    if (((cred->private_key && cred->private_key[0]) ||
         (cred->key_id && cred->key_id[0])) &&
        nai_realm_cred_cert(wpa_s, eap))
      return eap;
  }

  return NULL;
}


#ifdef INTERWORKING_3GPP

static int plmn_id_match(struct wpabuf *anqp, const char *imsi, int mnc_len)
{
  u8 plmn[3], plmn2[3];
  const u8 *pos, *end;
  u8 udhl;

  /*
   * See Annex A of 3GPP TS 24.234 v8.1.0 for description. The network
   * operator is allowed to include only two digits of the MNC, so allow
   * matches based on both two and three digit MNC assumptions. Since some
   * SIM/USIM cards may not expose MNC length conveniently, we may be
   * provided the default MNC length 3 here and as such, checking with MNC
   * length 2 is justifiable even though 3GPP TS 24.234 does not mention
   * that case. Anyway, MCC/MNC pair where both 2 and 3 digit MNC is used
   * with otherwise matching values would not be good idea in general, so
   * this should not result in selecting incorrect networks.
   */
  /* Match with 3 digit MNC */
  plmn[0] = (imsi[0] - '0') | ((imsi[1] - '0') << 4);
  plmn[1] = (imsi[2] - '0') | ((imsi[5] - '0') << 4);
  plmn[2] = (imsi[3] - '0') | ((imsi[4] - '0') << 4);
  /* Match with 2 digit MNC */
  plmn2[0] = (imsi[0] - '0') | ((imsi[1] - '0') << 4);
  plmn2[1] = (imsi[2] - '0') | 0xf0;
  plmn2[2] = (imsi[3] - '0') | ((imsi[4] - '0') << 4);

  if (anqp == NULL)
    return 0;
  pos = wpabuf_head_u8(anqp);
  end = pos + wpabuf_len(anqp);
  if (end - pos < 2)
    return 0;
  if (*pos != 0) {
    wpa_printf(MSG_DEBUG, "Unsupported GUD version 0x%x", *pos);
    return 0;
  }
  pos++;
  udhl = *pos++;
  if (udhl > end - pos) {
    wpa_printf(MSG_DEBUG, "Invalid UDHL");
    return 0;
  }
  end = pos + udhl;

  wpa_printf(MSG_DEBUG, "Interworking: Matching against MCC/MNC alternatives: %02x:%02x:%02x or %02x:%02x:%02x (IMSI %s, MNC length %d)",
       plmn[0], plmn[1], plmn[2], plmn2[0], plmn2[1], plmn2[2],
       imsi, mnc_len);

  while (end - pos >= 2) {
    u8 iei, len;
    const u8 *l_end;
    iei = *pos++;
    len = *pos++ & 0x7f;
    if (len > end - pos)
      break;
    l_end = pos + len;

    if (iei == 0 && len > 0) {
      /* PLMN List */
      u8 num, i;
      wpa_hexdump(MSG_DEBUG, "Interworking: PLMN List information element",
            pos, len);
      num = *pos++;
      for (i = 0; i < num; i++) {
        if (l_end - pos < 3)
          break;
        if (os_memcmp(pos, plmn, 3) == 0 ||
            os_memcmp(pos, plmn2, 3) == 0)
          return 1; /* Found matching PLMN */
        pos += 3;
      }
    } else {
      wpa_hexdump(MSG_DEBUG, "Interworking: Unrecognized 3GPP information element",
            pos, len);
    }

    pos = l_end;
  }

  return 0;
}


static int build_root_nai(char *nai, size_t nai_len, const char *imsi,
        size_t mnc_len, char prefix)
{
  const char *sep, *msin;
  char *end, *pos;
  size_t msin_len, plmn_len;

  /*
   * TS 23.003, Clause 14 (3GPP to WLAN Interworking)
   * Root NAI:
   * <aka:0|sim:1><IMSI>@wlan.mnc<MNC>.mcc<MCC>.3gppnetwork.org
   * <MNC> is zero-padded to three digits in case two-digit MNC is used
   */

  if (imsi == NULL || os_strlen(imsi) > 16) {
    wpa_printf(MSG_DEBUG, "No valid IMSI available");
    return -1;
  }
  sep = os_strchr(imsi, '-');
  if (sep) {
    plmn_len = sep - imsi;
    msin = sep + 1;
  } else if (mnc_len && os_strlen(imsi) >= 3 + mnc_len) {
    plmn_len = 3 + mnc_len;
    msin = imsi + plmn_len;
  } else
    return -1;
  if (plmn_len != 5 && plmn_len != 6)
    return -1;
  msin_len = os_strlen(msin);

  pos = nai;
  end = nai + nai_len;
  if (prefix)
    *pos++ = prefix;
  os_memcpy(pos, imsi, plmn_len);
  pos += plmn_len;
  os_memcpy(pos, msin, msin_len);
  pos += msin_len;
  pos += os_snprintf(pos, end - pos, "@wlan.mnc");
  if (plmn_len == 5) {
    *pos++ = '0';
    *pos++ = imsi[3];
    *pos++ = imsi[4];
  } else {
    *pos++ = imsi[3];
    *pos++ = imsi[4];
    *pos++ = imsi[5];
  }
  os_snprintf(pos, end - pos, ".mcc%c%c%c.3gppnetwork.org",
        imsi[0], imsi[1], imsi[2]);

  return 0;
}


static int set_root_nai(struct wpa_ssid *ssid, const char *imsi, char prefix)
{
  char nai[100];
  if (build_root_nai(nai, sizeof(nai), imsi, 0, prefix) < 0)
    return -1;
  return wpa_config_set_quoted(ssid, "identity", nai);
}

#endif /* INTERWORKING_3GPP */


static int already_connected(struct wpa_supplicant *wpa_s,
           struct wpa_cred *cred, struct wpa_bss *bss)
{
  struct wpa_ssid *ssid, *sel_ssid;
  struct wpa_bss *selected;

  if (wpa_s->wpa_state < WPA_ASSOCIATED || wpa_s->current_ssid == NULL)
    return 0;

  ssid = wpa_s->current_ssid;
  if (ssid->parent_cred != cred)
    return 0;

  if (ssid->ssid_len != bss->ssid_len ||
      os_memcmp(ssid->ssid, bss->ssid, bss->ssid_len) != 0)
    return 0;

  sel_ssid = NULL;
  selected = wpa_supplicant_pick_network(wpa_s, &sel_ssid);
  if (selected && sel_ssid && sel_ssid->priority > ssid->priority)
    return 0; /* higher priority network in scan results */

  return 1;
}


static void remove_duplicate_network(struct wpa_supplicant *wpa_s,
             struct wpa_cred *cred,
             struct wpa_bss *bss)
{
  struct wpa_ssid *ssid;

  for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
    if (ssid->parent_cred != cred)
      continue;
    if (ssid->ssid_len != bss->ssid_len ||
        os_memcmp(ssid->ssid, bss->ssid, bss->ssid_len) != 0)
      continue;

    break;
  }

  if (ssid == NULL)
    return;

  wpa_printf(MSG_DEBUG, "Interworking: Remove duplicate network entry for the same credential");

  if (ssid == wpa_s->current_ssid) {
    wpa_sm_set_config(wpa_s->wpa, NULL);
    eapol_sm_notify_config(wpa_s->eapol, NULL, NULL);
    wpa_s->own_disconnect_req = 1;
    wpa_supplicant_deauthenticate(wpa_s,
                WLAN_REASON_DEAUTH_LEAVING);
  }

  wpas_notify_network_removed(wpa_s, ssid);
  wpa_config_remove_network(wpa_s->conf, ssid->id);
}


static int interworking_set_hs20_params(struct wpa_supplicant *wpa_s,
          struct wpa_ssid *ssid)
{
  const char *key_mgmt = NULL;
#ifdef CONFIG_IEEE80211R
  int res;
  struct wpa_driver_capa capa;

  res = wpa_drv_get_capa(wpa_s, &capa);
  if (res == 0 && capa.key_mgmt_iftype[WPA_IF_STATION] &
      WPA_DRIVER_CAPA_KEY_MGMT_FT) {
    key_mgmt = wpa_s->conf->pmf != NO_MGMT_FRAME_PROTECTION ?
      "WPA-EAP WPA-EAP-SHA256 FT-EAP" :
      "WPA-EAP FT-EAP";
  }
#endif /* CONFIG_IEEE80211R */

  if (!key_mgmt)
    key_mgmt = wpa_s->conf->pmf != NO_MGMT_FRAME_PROTECTION ?
      "WPA-EAP WPA-EAP-SHA256" : "WPA-EAP";
  if (wpa_config_set(ssid, "key_mgmt", key_mgmt, 0) < 0 ||
      wpa_config_set(ssid, "proto", "RSN", 0) < 0 ||
      wpa_config_set(ssid, "ieee80211w",
         wpa_s->conf->pmf == MGMT_FRAME_PROTECTION_REQUIRED ?
         "2" : "1", 0) < 0 ||
      wpa_config_set(ssid, "pairwise", "CCMP", 0) < 0)
    return -1;
  return 0;
}


static int interworking_connect_3gpp(struct wpa_supplicant *wpa_s,
             struct wpa_cred *cred,
             struct wpa_bss *bss, int only_add)
{
#ifdef INTERWORKING_3GPP
  struct wpa_ssid *ssid;
  int eap_type;
  int res;
  char prefix;

  if (bss->anqp == NULL || bss->anqp->anqp_3gpp == NULL)
    return -1;

  wpa_msg(wpa_s, MSG_DEBUG, "Interworking: Connect with " MACSTR
    " (3GPP)", MAC2STR(bss->bssid));

  if (already_connected(wpa_s, cred, bss)) {
    wpa_msg(wpa_s, MSG_INFO, INTERWORKING_ALREADY_CONNECTED MACSTR,
      MAC2STR(bss->bssid));
    return wpa_s->current_ssid->id;
  }

  remove_duplicate_network(wpa_s, cred, bss);

  ssid = wpa_config_add_network(wpa_s->conf);
  if (ssid == NULL)
    return -1;
  ssid->parent_cred = cred;

  wpas_notify_network_added(wpa_s, ssid);
  wpa_config_set_network_defaults(ssid);
  ssid->priority = cred->priority;
  ssid->temporary = 1;
  ssid->ssid = os_zalloc(bss->ssid_len + 1);
  if (ssid->ssid == NULL)
    goto fail;
  os_memcpy(ssid->ssid, bss->ssid, bss->ssid_len);
  ssid->ssid_len = bss->ssid_len;
  ssid->eap.sim_num = cred->sim_num;

  if (interworking_set_hs20_params(wpa_s, ssid) < 0)
    goto fail;

  eap_type = EAP_TYPE_SIM;
  if (cred->pcsc && wpa_s->scard && scard_supports_umts(wpa_s->scard))
    eap_type = EAP_TYPE_AKA;
  if (cred->eap_method && cred->eap_method[0].vendor == EAP_VENDOR_IETF) {
    if (cred->eap_method[0].method == EAP_TYPE_SIM ||
        cred->eap_method[0].method == EAP_TYPE_AKA ||
        cred->eap_method[0].method == EAP_TYPE_AKA_PRIME)
      eap_type = cred->eap_method[0].method;
  }

  switch (eap_type) {
  case EAP_TYPE_SIM:
    prefix = '1';
    res = wpa_config_set(ssid, "eap", "SIM", 0);
    break;
  case EAP_TYPE_AKA:
    prefix = '0';
    res = wpa_config_set(ssid, "eap", "AKA", 0);
    break;
  case EAP_TYPE_AKA_PRIME:
    prefix = '6';
    res = wpa_config_set(ssid, "eap", "AKA'", 0);
    break;
  default:
    res = -1;
    break;
  }
  if (res < 0) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "Selected EAP method (%d) not supported", eap_type);
    goto fail;
  }

  if (!cred->pcsc && set_root_nai(ssid, cred->imsi, prefix) < 0) {
    wpa_msg(wpa_s, MSG_DEBUG, "Failed to set Root NAI");
    goto fail;
  }

  if (cred->milenage && cred->milenage[0]) {
    if (wpa_config_set_quoted(ssid, "password",
            cred->milenage) < 0)
      goto fail;
  } else if (cred->pcsc) {
    if (wpa_config_set_quoted(ssid, "pcsc", "") < 0)
      goto fail;
    if (wpa_s->conf->pcsc_pin &&
        wpa_config_set_quoted(ssid, "pin", wpa_s->conf->pcsc_pin)
        < 0)
      goto fail;
  }

  if (cred->imsi_privacy_cert && cred->imsi_privacy_cert[0]) {
    if (wpa_config_set_quoted(ssid, "imsi_privacy_cert",
            cred->imsi_privacy_cert) < 0)
      goto fail;
  }

  if (cred->imsi_privacy_attr && cred->imsi_privacy_attr[0]) {
    if (wpa_config_set_quoted(ssid, "imsi_privacy_attr",
            cred->imsi_privacy_attr) < 0)
      goto fail;
  }

  wpa_s->next_ssid = ssid;
  wpa_config_update_prio_list(wpa_s->conf);
  if (!only_add)
    interworking_reconnect(wpa_s);

  return ssid->id;

fail:
  wpas_notify_network_removed(wpa_s, ssid);
  wpa_config_remove_network(wpa_s->conf, ssid->id);
#endif /* INTERWORKING_3GPP */
  return -1;
}


static int oi_element_match(const u8 *ie, const u8 *oi, size_t oi_len)
{
  const u8 *pos, *end;
  u8 lens;

  if (ie == NULL)
    return 0;

  pos = ie + 2;
  end = ie + 2 + ie[1];

  /* Roaming Consortium element:
   * Number of ANQP OIs
   * OI #1 and #2 lengths
   * OI #1, [OI #2], [OI #3]
   */

  if (end - pos < 2)
    return 0;

  pos++; /* skip Number of ANQP OIs */
  lens = *pos++;
  if ((lens & 0x0f) + (lens >> 4) > end - pos)
    return 0;

  if ((lens & 0x0f) == oi_len && os_memcmp(pos, oi, oi_len) == 0)
    return 1;
  pos += lens & 0x0f;

  if ((lens >> 4) == oi_len && os_memcmp(pos, oi, oi_len) == 0)
    return 1;
  pos += lens >> 4;

  if (pos < end && (size_t) (end - pos) == oi_len &&
      os_memcmp(pos, oi, oi_len) == 0)
    return 1;

  return 0;
}


static int oi_anqp_match(const struct wpabuf *anqp, const u8 *oi,
       size_t oi_len)
{
  const u8 *pos, *end;
  u8 len;

  if (anqp == NULL)
    return 0;

  pos = wpabuf_head(anqp);
  end = pos + wpabuf_len(anqp);

  /* Set of <OI Length, OI> duples */
  while (pos < end) {
    len = *pos++;
    if (len > end - pos)
      break;
    if (len == oi_len && os_memcmp(pos, oi, oi_len) == 0)
      return 1;
    pos += len;
  }

  return 0;
}


static int oi_match(const u8 *ie, const struct wpabuf *anqp,
        const u8 *oi, size_t oi_len)
{
  return oi_element_match(ie, oi, oi_len) ||
    oi_anqp_match(anqp, oi, oi_len);
}


static int cred_home_ois_match(const u8 *ie, const struct wpabuf *anqp,
             const struct wpa_cred *cred) {
  unsigned int i;

  /* There's a match if at least one of the home OI matches. */
  for (i = 0; i < cred->num_home_ois; i++) {
    if (oi_match(ie, anqp, cred->home_ois[i],
           cred->home_ois_len[i]))
      return 1;
  }

  return 0;
}


static int cred_roaming_consortiums_match(const u8 *ie,
            const struct wpabuf *anqp,
            const struct wpa_cred *cred)
{
  unsigned int i;

  for (i = 0; i < cred->num_roaming_consortiums; i++) {
    if (oi_match(ie, anqp, cred->roaming_consortiums[i],
           cred->roaming_consortiums_len[i]))
      return 1;
  }

  return 0;
}


static int cred_no_required_oi_match(struct wpa_cred *cred, struct wpa_bss *bss)
{
  const u8 *ie;
  unsigned int i;

  if (cred->num_required_home_ois == 0)
    return 0;

  ie = wpa_bss_get_ie(bss, WLAN_EID_ROAMING_CONSORTIUM);

  if (ie == NULL &&
      (bss->anqp == NULL || bss->anqp->roaming_consortium == NULL))
    return 1;

  /* According to Passpoint specification, there must be a match for
   * each required home OI provided. */
  for (i = 0; i < cred->num_required_home_ois; i++) {
    if (!oi_match(ie, bss->anqp ?
            bss->anqp->roaming_consortium : NULL,
            cred->required_home_ois[i],
            cred->required_home_ois_len[i]))
      return 1;
  }
  return 0;
}


static int cred_excluded_ssid(struct wpa_cred *cred, struct wpa_bss *bss)
{
  size_t i;

  if (!cred->excluded_ssid)
    return 0;

  for (i = 0; i < cred->num_excluded_ssid; i++) {
    struct excluded_ssid *e = &cred->excluded_ssid[i];
    if (bss->ssid_len == e->ssid_len &&
        os_memcmp(bss->ssid, e->ssid, e->ssid_len) == 0)
      return 1;
  }

  return 0;
}


static int cred_below_min_backhaul(struct wpa_supplicant *wpa_s,
           struct wpa_cred *cred, struct wpa_bss *bss)
{
#ifdef CONFIG_HS20
  int res;
  unsigned int dl_bandwidth, ul_bandwidth;
  const u8 *wan;
  u8 wan_info, dl_load, ul_load;
  u16 lmd;
  u32 ul_speed, dl_speed;

  if (!cred->min_dl_bandwidth_home &&
      !cred->min_ul_bandwidth_home &&
      !cred->min_dl_bandwidth_roaming &&
      !cred->min_ul_bandwidth_roaming)
    return 0; /* No bandwidth constraint specified */

  if (bss->anqp == NULL || bss->anqp->hs20_wan_metrics == NULL)
    return 0; /* No WAN Metrics known - ignore constraint */

  wan = wpabuf_head(bss->anqp->hs20_wan_metrics);
  wan_info = wan[0];
  if (wan_info & BIT(3))
    return 1; /* WAN link at capacity */
  lmd = WPA_GET_LE16(wan + 11);
  if (lmd == 0)
    return 0; /* Downlink/Uplink Load was not measured */
  dl_speed = WPA_GET_LE32(wan + 1);
  ul_speed = WPA_GET_LE32(wan + 5);
  dl_load = wan[9];
  ul_load = wan[10];

  if (dl_speed >= 0xffffff)
    dl_bandwidth = dl_speed / 255 * (255 - dl_load);
  else
    dl_bandwidth = dl_speed * (255 - dl_load) / 255;

  if (ul_speed >= 0xffffff)
    ul_bandwidth = ul_speed / 255 * (255 - ul_load);
  else
    ul_bandwidth = ul_speed * (255 - ul_load) / 255;

  res = interworking_home_sp_cred(wpa_s, cred, bss->anqp ?
          bss->anqp->domain_name : NULL);
  if (res > 0) {
    if (cred->min_dl_bandwidth_home > dl_bandwidth)
      return 1;
    if (cred->min_ul_bandwidth_home > ul_bandwidth)
      return 1;
  } else {
    if (cred->min_dl_bandwidth_roaming > dl_bandwidth)
      return 1;
    if (cred->min_ul_bandwidth_roaming > ul_bandwidth)
      return 1;
  }
#endif /* CONFIG_HS20 */

  return 0;
}


static int cred_over_max_bss_load(struct wpa_supplicant *wpa_s,
          struct wpa_cred *cred, struct wpa_bss *bss)
{
  const u8 *ie;
  int res;

  if (!cred->max_bss_load)
    return 0; /* No BSS Load constraint specified */

  ie = wpa_bss_get_ie(bss, WLAN_EID_BSS_LOAD);
  if (ie == NULL || ie[1] < 3)
    return 0; /* No BSS Load advertised */

  res = interworking_home_sp_cred(wpa_s, cred, bss->anqp ?
          bss->anqp->domain_name : NULL);
  if (res <= 0)
    return 0; /* Not a home network */

  return ie[4] > cred->max_bss_load;
}


#ifdef CONFIG_HS20

static int has_proto_match(const u8 *pos, const u8 *end, u8 proto)
{
  while (end - pos >= 4) {
    if (pos[0] == proto && pos[3] == 1 /* Open */)
      return 1;
    pos += 4;
  }

  return 0;
}


static int has_proto_port_match(const u8 *pos, const u8 *end, u8 proto,
        u16 port)
{
  while (end - pos >= 4) {
    if (pos[0] == proto && WPA_GET_LE16(&pos[1]) == port &&
        pos[3] == 1 /* Open */)
      return 1;
    pos += 4;
  }

  return 0;
}

#endif /* CONFIG_HS20 */


static int cred_conn_capab_missing(struct wpa_supplicant *wpa_s,
           struct wpa_cred *cred, struct wpa_bss *bss)
{
#ifdef CONFIG_HS20
  int res;
  const u8 *capab, *end;
  unsigned int i, j;
  int *ports;

  if (!cred->num_req_conn_capab)
    return 0; /* No connection capability constraint specified */

  if (bss->anqp == NULL || bss->anqp->hs20_connection_capability == NULL)
    return 0; /* No Connection Capability known - ignore constraint
         */

  res = interworking_home_sp_cred(wpa_s, cred, bss->anqp ?
          bss->anqp->domain_name : NULL);
  if (res > 0)
    return 0; /* No constraint in home network */

  capab = wpabuf_head(bss->anqp->hs20_connection_capability);
  end = capab + wpabuf_len(bss->anqp->hs20_connection_capability);

  for (i = 0; i < cred->num_req_conn_capab; i++) {
    ports = cred->req_conn_capab_port[i];
    if (!ports) {
      if (!has_proto_match(capab, end,
               cred->req_conn_capab_proto[i]))
        return 1;
    } else {
      for (j = 0; ports[j] > -1; j++) {
        if (!has_proto_port_match(
              capab, end,
              cred->req_conn_capab_proto[i],
              ports[j]))
          return 1;
      }
    }
  }
#endif /* CONFIG_HS20 */

  return 0;
}


static struct wpa_cred * interworking_credentials_available_roaming_consortium(
  struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw,
  int *excluded)
{
  struct wpa_cred *cred, *selected = NULL;
  const u8 *ie;
  const struct wpabuf *anqp;
  int is_excluded = 0;

  ie = wpa_bss_get_ie(bss, WLAN_EID_ROAMING_CONSORTIUM);
  anqp = bss->anqp ? bss->anqp->roaming_consortium : NULL;

  if (!ie && !anqp)
    return NULL;

  if (wpa_s->conf->cred == NULL)
    return NULL;

  for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
    if (cred->num_home_ois == 0 &&
        cred->num_required_home_ois == 0 &&
        cred->num_roaming_consortiums == 0)
      continue;

    if (!cred->eap_method)
      continue;

    /* If there's required home OIs, there must be a match for each
     * required OI (see Passpoint v3.2 - 9.1.2 - RequiredHomeOI). */
    if (cred->num_required_home_ois > 0 &&
        cred_no_required_oi_match(cred, bss))
      continue;

    if (!cred_home_ois_match(ie, anqp, cred) &&
        !cred_roaming_consortiums_match(ie, anqp, cred))
      continue;

    if (!ignore_bw && cred_below_min_backhaul(wpa_s, cred, bss))
      continue;
    if (!ignore_bw && cred_over_max_bss_load(wpa_s, cred, bss))
      continue;
    if (!ignore_bw && cred_conn_capab_missing(wpa_s, cred, bss))
      continue;
    if (cred_excluded_ssid(cred, bss)) {
      if (excluded == NULL)
        continue;
      if (selected == NULL) {
        selected = cred;
        is_excluded = 1;
      }
    } else {
      if (selected == NULL || is_excluded ||
          cred_prio_cmp(selected, cred) < 0) {
        selected = cred;
        is_excluded = 0;
      }
    }
  }

  if (excluded)
    *excluded = is_excluded;

  return selected;
}


static int interworking_set_eap_params(struct wpa_ssid *ssid,
               struct wpa_cred *cred, int ttls)
{
  if (cred->eap_method) {
    ttls = cred->eap_method->vendor == EAP_VENDOR_IETF &&
      cred->eap_method->method == EAP_TYPE_TTLS;

    os_free(ssid->eap.eap_methods);
    ssid->eap.eap_methods =
      os_malloc(sizeof(struct eap_method_type) * 2);
    if (ssid->eap.eap_methods == NULL)
      return -1;
    os_memcpy(ssid->eap.eap_methods, cred->eap_method,
        sizeof(*cred->eap_method));
    ssid->eap.eap_methods[1].vendor = EAP_VENDOR_IETF;
    ssid->eap.eap_methods[1].method = EAP_TYPE_NONE;
  }

  if (ttls && cred->username && cred->username[0]) {
    const char *pos;
    char *anon;
    /* Use anonymous NAI in Phase 1 */
    pos = os_strchr(cred->username, '@');
    if (pos) {
      size_t buflen = 9 + os_strlen(pos) + 1;
      anon = os_malloc(buflen);
      if (anon == NULL)
        return -1;
      os_snprintf(anon, buflen, "anonymous%s", pos);
    } else if (cred->realm) {
      size_t buflen = 10 + os_strlen(cred->realm) + 1;
      anon = os_malloc(buflen);
      if (anon == NULL)
        return -1;
      os_snprintf(anon, buflen, "anonymous@%s", cred->realm);
    } else {
      anon = os_strdup("anonymous");
      if (anon == NULL)
        return -1;
    }
    if (wpa_config_set_quoted(ssid, "anonymous_identity", anon) <
        0) {
      os_free(anon);
      return -1;
    }
    os_free(anon);
  }

  if (!ttls && cred->username && cred->username[0] && cred->realm &&
      !os_strchr(cred->username, '@')) {
    char *id;
    size_t buflen;
    int res;

    buflen = os_strlen(cred->username) + 1 +
      os_strlen(cred->realm) + 1;

    id = os_malloc(buflen);
    if (!id)
      return -1;
    os_snprintf(id, buflen, "%s@%s", cred->username, cred->realm);
    res = wpa_config_set_quoted(ssid, "identity", id);
    os_free(id);
    if (res < 0)
      return -1;
  } else if (cred->username && cred->username[0] &&
      wpa_config_set_quoted(ssid, "identity", cred->username) < 0)
    return -1;

  if (cred->password && cred->password[0]) {
    if (cred->ext_password &&
        wpa_config_set(ssid, "password", cred->password, 0) < 0)
      return -1;
    if (!cred->ext_password &&
        wpa_config_set_quoted(ssid, "password", cred->password) <
        0)
      return -1;
  }

  if (cred->client_cert && cred->client_cert[0] &&
      wpa_config_set_quoted(ssid, "client_cert", cred->client_cert) < 0)
    return -1;

#ifdef ANDROID
  if (cred->private_key &&
      os_strncmp(cred->private_key, "keystore://", 11) == 0) {
    /* Use OpenSSL engine configuration for Android keystore */
    if (wpa_config_set_quoted(ssid, "engine_id", "keystore") < 0 ||
        wpa_config_set_quoted(ssid, "key_id",
            cred->private_key + 11) < 0 ||
        wpa_config_set(ssid, "engine", "1", 0) < 0)
      return -1;
  } else
#endif /* ANDROID */
  if (cred->private_key && cred->private_key[0] &&
      wpa_config_set_quoted(ssid, "private_key", cred->private_key) < 0)
    return -1;

  if (cred->private_key_passwd && cred->private_key_passwd[0] &&
      wpa_config_set_quoted(ssid, "private_key_passwd",
          cred->private_key_passwd) < 0)
    return -1;

  if (cred->ca_cert_id && cred->ca_cert_id[0] &&
      wpa_config_set_quoted(ssid, "ca_cert_id", cred->ca_cert_id) < 0)
    return -1;

  if (cred->cert_id && cred->cert_id[0] &&
      wpa_config_set_quoted(ssid, "cert_id", cred->cert_id) < 0)
    return -1;

  if (cred->key_id && cred->key_id[0] &&
      wpa_config_set_quoted(ssid, "key_id", cred->key_id) < 0)
    return -1;

  if (cred->engine_id && cred->engine_id[0] &&
      wpa_config_set_quoted(ssid, "engine_id", cred->engine_id) < 0)
    return -1;

  ssid->eap.cert.engine = cred->engine;

  if (cred->phase1) {
    os_free(ssid->eap.phase1);
    ssid->eap.phase1 = os_strdup(cred->phase1);
  }
  if (cred->phase2) {
    os_free(ssid->eap.phase2);
    ssid->eap.phase2 = os_strdup(cred->phase2);
  }

  if (cred->ca_cert && cred->ca_cert[0] &&
      wpa_config_set_quoted(ssid, "ca_cert", cred->ca_cert) < 0)
    return -1;

  if (cred->domain_suffix_match && cred->domain_suffix_match[0] &&
      wpa_config_set_quoted(ssid, "domain_suffix_match",
          cred->domain_suffix_match) < 0)
    return -1;

  ssid->eap.cert.ocsp = cred->ocsp;

  return 0;
}


static int interworking_connect_roaming_consortium(
  struct wpa_supplicant *wpa_s, struct wpa_cred *cred,
  struct wpa_bss *bss, int only_add)
{
  struct wpa_ssid *ssid;
  const u8 *ie;
  const struct wpabuf *anqp;
  unsigned int i;

  wpa_msg(wpa_s, MSG_DEBUG, "Interworking: Connect with " MACSTR
    " based on roaming consortium match", MAC2STR(bss->bssid));

  if (already_connected(wpa_s, cred, bss)) {
    wpa_msg(wpa_s, MSG_INFO, INTERWORKING_ALREADY_CONNECTED MACSTR,
      MAC2STR(bss->bssid));
    return wpa_s->current_ssid->id;
  }

  remove_duplicate_network(wpa_s, cred, bss);

  ssid = wpa_config_add_network(wpa_s->conf);
  if (ssid == NULL)
    return -1;
  ssid->parent_cred = cred;
  wpas_notify_network_added(wpa_s, ssid);
  wpa_config_set_network_defaults(ssid);
  ssid->priority = cred->priority;
  ssid->temporary = 1;
  ssid->ssid = os_zalloc(bss->ssid_len + 1);
  if (ssid->ssid == NULL)
    goto fail;
  os_memcpy(ssid->ssid, bss->ssid, bss->ssid_len);
  ssid->ssid_len = bss->ssid_len;

  if (interworking_set_hs20_params(wpa_s, ssid) < 0)
    goto fail;

  ie = wpa_bss_get_ie(bss, WLAN_EID_ROAMING_CONSORTIUM);
  anqp = bss->anqp ? bss->anqp->roaming_consortium : NULL;
  for (i = 0; (ie || anqp) && i < cred->num_roaming_consortiums; i++) {
    if (!oi_match(ie, anqp, cred->roaming_consortiums[i],
            cred->roaming_consortiums_len[i]))
      continue;

    ssid->roaming_consortium_selection =
      os_malloc(cred->roaming_consortiums_len[i]);
    if (!ssid->roaming_consortium_selection)
      goto fail;
    os_memcpy(ssid->roaming_consortium_selection,
        cred->roaming_consortiums[i],
        cred->roaming_consortiums_len[i]);
    ssid->roaming_consortium_selection_len =
      cred->roaming_consortiums_len[i];
    break;
  }

  if (cred->eap_method == NULL) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: No EAP method set for credential using roaming consortium");
    goto fail;
  }

  if (interworking_set_eap_params(
        ssid, cred,
        cred->eap_method->vendor == EAP_VENDOR_IETF &&
        cred->eap_method->method == EAP_TYPE_TTLS) < 0)
    goto fail;

  wpa_s->next_ssid = ssid;
  wpa_config_update_prio_list(wpa_s->conf);
  if (!only_add)
    interworking_reconnect(wpa_s);

  return ssid->id;

fail:
  wpas_notify_network_removed(wpa_s, ssid);
  wpa_config_remove_network(wpa_s->conf, ssid->id);
  return -1;
}


int interworking_connect(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
       int only_add)
{
  struct wpa_cred *cred, *cred_rc, *cred_3gpp;
  struct wpa_ssid *ssid;
  struct nai_realm *realm;
  struct nai_realm_eap *eap = NULL;
  u16 count, i;
  char buf[100];
  int excluded = 0, *excl = &excluded;
  const char *name;

  if (wpa_s->conf->cred == NULL || bss == NULL)
    return -1;
  if (disallowed_bssid(wpa_s, bss->bssid) ||
      disallowed_ssid(wpa_s, bss->ssid, bss->ssid_len)) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: Reject connection to disallowed BSS "
      MACSTR, MAC2STR(bss->bssid));
    return -1;
  }

  wpa_printf(MSG_DEBUG, "Interworking: Considering BSS " MACSTR
       " for connection",
       MAC2STR(bss->bssid));

  if (!wpa_bss_get_ie(bss, WLAN_EID_RSN)) {
    /*
     * We currently support only HS 2.0 networks and those are
     * required to use WPA2-Enterprise.
     */
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: Network does not use RSN");
    return -1;
  }

  cred_rc = interworking_credentials_available_roaming_consortium(
    wpa_s, bss, 0, excl);
  if (cred_rc) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: Highest roaming consortium matching credential priority %d sp_priority %d",
      cred_rc->priority, cred_rc->sp_priority);
    if (excl && !(*excl))
      excl = NULL;
  }

  cred = interworking_credentials_available_realm(wpa_s, bss, 0, excl);
  if (cred) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: Highest NAI Realm list matching credential priority %d sp_priority %d",
      cred->priority, cred->sp_priority);
    if (excl && !(*excl))
      excl = NULL;
  }

  cred_3gpp = interworking_credentials_available_3gpp(wpa_s, bss, 0,
                  excl);
  if (cred_3gpp) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: Highest 3GPP matching credential priority %d sp_priority %d",
      cred_3gpp->priority, cred_3gpp->sp_priority);
    if (excl && !(*excl))
      excl = NULL;
  }

  if (!cred_rc && !cred && !cred_3gpp) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: No full credential matches - consider options without BW(etc.) limits");
    cred_rc = interworking_credentials_available_roaming_consortium(
      wpa_s, bss, 1, excl);
    if (cred_rc) {
      wpa_msg(wpa_s, MSG_DEBUG,
        "Interworking: Highest roaming consortium matching credential priority %d sp_priority %d (ignore BW)",
        cred_rc->priority, cred_rc->sp_priority);
      if (excl && !(*excl))
        excl = NULL;
    }

    cred = interworking_credentials_available_realm(wpa_s, bss, 1,
                excl);
    if (cred) {
      wpa_msg(wpa_s, MSG_DEBUG,
        "Interworking: Highest NAI Realm list matching credential priority %d sp_priority %d (ignore BW)",
        cred->priority, cred->sp_priority);
      if (excl && !(*excl))
        excl = NULL;
    }

    cred_3gpp = interworking_credentials_available_3gpp(wpa_s, bss,
                    1, excl);
    if (cred_3gpp) {
      wpa_msg(wpa_s, MSG_DEBUG,
        "Interworking: Highest 3GPP matching credential priority %d sp_priority %d (ignore BW)",
        cred_3gpp->priority, cred_3gpp->sp_priority);
      if (excl && !(*excl))
        excl = NULL;
    }
  }

  if (cred_rc &&
      (cred == NULL || cred_prio_cmp(cred_rc, cred) >= 0) &&
      (cred_3gpp == NULL || cred_prio_cmp(cred_rc, cred_3gpp) >= 0))
    return interworking_connect_roaming_consortium(wpa_s, cred_rc,
                     bss, only_add);

  if (cred_3gpp &&
      (cred == NULL || cred_prio_cmp(cred_3gpp, cred) >= 0)) {
    return interworking_connect_3gpp(wpa_s, cred_3gpp, bss,
             only_add);
  }

  if (cred == NULL) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: No matching credentials found for "
      MACSTR, MAC2STR(bss->bssid));
    return -1;
  }

  realm = nai_realm_parse(bss->anqp ? bss->anqp->nai_realm : NULL,
        &count);
  if (realm == NULL) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: Could not parse NAI Realm list from "
      MACSTR, MAC2STR(bss->bssid));
    return -1;
  }

  for (i = 0; i < count; i++) {
    if (!nai_realm_match(&realm[i], cred->realm))
      continue;
    eap = nai_realm_find_eap(wpa_s, cred, &realm[i]);
    if (eap)
      break;
  }

  if (!eap) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: No matching credentials and EAP method found for "
      MACSTR, MAC2STR(bss->bssid));
    nai_realm_free(realm, count);
    return -1;
  }

  wpa_msg(wpa_s, MSG_DEBUG, "Interworking: Connect with " MACSTR,
    MAC2STR(bss->bssid));

  if (already_connected(wpa_s, cred, bss)) {
    wpa_msg(wpa_s, MSG_INFO, INTERWORKING_ALREADY_CONNECTED MACSTR,
      MAC2STR(bss->bssid));
    nai_realm_free(realm, count);
    return 0;
  }

  remove_duplicate_network(wpa_s, cred, bss);

  ssid = wpa_config_add_network(wpa_s->conf);
  if (ssid == NULL) {
    nai_realm_free(realm, count);
    return -1;
  }
  ssid->parent_cred = cred;
  wpas_notify_network_added(wpa_s, ssid);
  wpa_config_set_network_defaults(ssid);
  ssid->priority = cred->priority;
  ssid->temporary = 1;
  ssid->ssid = os_zalloc(bss->ssid_len + 1);
  if (ssid->ssid == NULL)
    goto fail;
  os_memcpy(ssid->ssid, bss->ssid, bss->ssid_len);
  ssid->ssid_len = bss->ssid_len;

  if (interworking_set_hs20_params(wpa_s, ssid) < 0)
    goto fail;

  if (wpa_config_set(ssid, "eap", eap_get_name(EAP_VENDOR_IETF,
                 eap->method), 0) < 0)
    goto fail;

  switch (eap->method) {
  case EAP_TYPE_TTLS:
    if (eap->inner_method) {
      name = eap_get_name(EAP_VENDOR_IETF, eap->inner_method);
      if (!name)
        goto fail;
      os_snprintf(buf, sizeof(buf), "\"autheap=%s\"", name);
      if (wpa_config_set(ssid, "phase2", buf, 0) < 0)
        goto fail;
      break;
    }
    switch (eap->inner_non_eap) {
    case NAI_REALM_INNER_NON_EAP_PAP:
      if (wpa_config_set(ssid, "phase2", "\"auth=PAP\"", 0) <
          0)
        goto fail;
      break;
    case NAI_REALM_INNER_NON_EAP_CHAP:
      if (wpa_config_set(ssid, "phase2", "\"auth=CHAP\"", 0)
          < 0)
        goto fail;
      break;
    case NAI_REALM_INNER_NON_EAP_MSCHAP:
      if (wpa_config_set(ssid, "phase2", "\"auth=MSCHAP\"",
             0) < 0)
        goto fail;
      break;
    case NAI_REALM_INNER_NON_EAP_MSCHAPV2:
      if (wpa_config_set(ssid, "phase2", "\"auth=MSCHAPV2\"",
             0) < 0)
        goto fail;
      break;
    default:
      /* EAP params were not set - assume TTLS/MSCHAPv2 */
      if (wpa_config_set(ssid, "phase2", "\"auth=MSCHAPV2\"",
             0) < 0)
        goto fail;
      break;
    }
    break;
  case EAP_TYPE_PEAP:
  case EAP_TYPE_FAST:
    if (wpa_config_set(ssid, "phase1", "\"fast_provisioning=2\"",
           0) < 0)
      goto fail;
    if (wpa_config_set(ssid, "pac_file",
           "\"blob://pac_interworking\"", 0) < 0)
      goto fail;
    name = eap_get_name(EAP_VENDOR_IETF,
            eap->inner_method ? eap->inner_method :
            EAP_TYPE_MSCHAPV2);
    if (name == NULL)
      goto fail;
    os_snprintf(buf, sizeof(buf), "\"auth=%s\"", name);
    if (wpa_config_set(ssid, "phase2", buf, 0) < 0)
      goto fail;
    break;
  case EAP_TYPE_TLS:
    break;
  }

  if (interworking_set_eap_params(ssid, cred,
          eap->method == EAP_TYPE_TTLS) < 0)
    goto fail;

  nai_realm_free(realm, count);

  wpa_s->next_ssid = ssid;
  wpa_config_update_prio_list(wpa_s->conf);
  if (!only_add)
    interworking_reconnect(wpa_s);

  return ssid->id;

fail:
  wpas_notify_network_removed(wpa_s, ssid);
  wpa_config_remove_network(wpa_s->conf, ssid->id);
  nai_realm_free(realm, count);
  return -1;
}


#ifdef PCSC_FUNCS
static int interworking_pcsc_read_imsi(struct wpa_supplicant *wpa_s)
{
  size_t len;

  if (wpa_s->imsi[0] && wpa_s->mnc_len)
    return 0;

  len = sizeof(wpa_s->imsi) - 1;
  if (scard_get_imsi(wpa_s->scard, wpa_s->imsi, &len)) {
    scard_deinit(wpa_s->scard);
    wpa_s->scard = NULL;
    wpa_msg(wpa_s, MSG_ERROR, "Could not read IMSI");
    return -1;
  }
  wpa_s->imsi[len] = '\0';
  wpa_s->mnc_len = scard_get_mnc_len(wpa_s->scard);
  wpa_printf(MSG_DEBUG, "SCARD: IMSI %s (MNC length %d)",
       wpa_s->imsi, wpa_s->mnc_len);

  return 0;
}
#endif /* PCSC_FUNCS */


static struct wpa_cred * interworking_credentials_available_3gpp(
  struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw,
  int *excluded)
{
  struct wpa_cred *selected = NULL;
#ifdef INTERWORKING_3GPP
  struct wpa_cred *cred;
  int ret;
  int is_excluded = 0;

  if (bss->anqp == NULL || bss->anqp->anqp_3gpp == NULL) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "interworking-avail-3gpp: not avail, anqp: %p  anqp_3gpp: %p",
      bss->anqp, bss->anqp ? bss->anqp->anqp_3gpp : NULL);
    return NULL;
  }

#ifdef CONFIG_EAP_PROXY
  if (!wpa_s->imsi[0]) {
    size_t len;
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: IMSI not available - try to read again through eap_proxy");
    wpa_s->mnc_len = eapol_sm_get_eap_proxy_imsi(wpa_s->eapol, -1,
                   wpa_s->imsi,
                   &len);
    if (wpa_s->mnc_len > 0) {
      wpa_s->imsi[len] = '\0';
      wpa_msg(wpa_s, MSG_DEBUG,
        "eap_proxy: IMSI %s (MNC length %d)",
        wpa_s->imsi, wpa_s->mnc_len);
    } else {
      wpa_msg(wpa_s, MSG_DEBUG,
        "eap_proxy: IMSI not available");
    }
  }
#endif /* CONFIG_EAP_PROXY */

  for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
    char *sep;
    const char *imsi;
    int mnc_len;
    char imsi_buf[16];
    size_t msin_len;

#ifdef PCSC_FUNCS
    if (cred->pcsc && wpa_s->scard) {
      if (interworking_pcsc_read_imsi(wpa_s) < 0)
        continue;
      imsi = wpa_s->imsi;
      mnc_len = wpa_s->mnc_len;
      goto compare;
    }
#endif /* PCSC_FUNCS */
#ifdef CONFIG_EAP_PROXY
    if (cred->pcsc && wpa_s->mnc_len > 0 && wpa_s->imsi[0]) {
      imsi = wpa_s->imsi;
      mnc_len = wpa_s->mnc_len;
      goto compare;
    }
#endif /* CONFIG_EAP_PROXY */

    if (cred->imsi == NULL || !cred->imsi[0] ||
        (!wpa_s->conf->external_sim &&
         (cred->milenage == NULL || !cred->milenage[0])))
      continue;

    sep = os_strchr(cred->imsi, '-');
    if (sep == NULL ||
        (sep - cred->imsi != 5 && sep - cred->imsi != 6))
      continue;
    mnc_len = sep - cred->imsi - 3;
    os_memcpy(imsi_buf, cred->imsi, 3 + mnc_len);
    sep++;
    msin_len = os_strlen(cred->imsi);
    if (3 + mnc_len + msin_len >= sizeof(imsi_buf) - 1)
      msin_len = sizeof(imsi_buf) - 3 - mnc_len - 1;
    os_memcpy(&imsi_buf[3 + mnc_len], sep, msin_len);
    imsi_buf[3 + mnc_len + msin_len] = '\0';
    imsi = imsi_buf;

#if defined(PCSC_FUNCS) || defined(CONFIG_EAP_PROXY)
  compare:
#endif /* PCSC_FUNCS || CONFIG_EAP_PROXY */
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: Parsing 3GPP info from " MACSTR,
      MAC2STR(bss->bssid));
    ret = plmn_id_match(bss->anqp->anqp_3gpp, imsi, mnc_len);
    wpa_msg(wpa_s, MSG_DEBUG, "PLMN match %sfound",
      ret ? "" : "not ");
    if (ret) {
      if (cred_no_required_oi_match(cred, bss))
        continue;
      if (!ignore_bw &&
          cred_below_min_backhaul(wpa_s, cred, bss))
        continue;
      if (!ignore_bw &&
          cred_over_max_bss_load(wpa_s, cred, bss))
        continue;
      if (!ignore_bw &&
          cred_conn_capab_missing(wpa_s, cred, bss))
        continue;
      if (cred_excluded_ssid(cred, bss)) {
        if (excluded == NULL)
          continue;
        if (selected == NULL) {
          selected = cred;
          is_excluded = 1;
        }
      } else {
        if (selected == NULL || is_excluded ||
            cred_prio_cmp(selected, cred) < 0) {
          selected = cred;
          is_excluded = 0;
        }
      }
    }
  }

  if (excluded)
    *excluded = is_excluded;
#endif /* INTERWORKING_3GPP */
  return selected;
}


static struct wpa_cred * interworking_credentials_available_realm(
  struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw,
  int *excluded)
{
  struct wpa_cred *cred, *selected = NULL;
  struct nai_realm *realm;
  u16 count, i;
  int is_excluded = 0;

  if (bss->anqp == NULL || bss->anqp->nai_realm == NULL)
    return NULL;

  if (wpa_s->conf->cred == NULL)
    return NULL;

  wpa_msg(wpa_s, MSG_DEBUG, "Interworking: Parsing NAI Realm list from "
    MACSTR, MAC2STR(bss->bssid));
  realm = nai_realm_parse(bss->anqp->nai_realm, &count);
  if (realm == NULL) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: Could not parse NAI Realm list from "
      MACSTR, MAC2STR(bss->bssid));
    return NULL;
  }

  for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
    if (cred->realm == NULL)
      continue;

    for (i = 0; i < count; i++) {
      if (!nai_realm_match(&realm[i], cred->realm))
        continue;
      if (nai_realm_find_eap(wpa_s, cred, &realm[i])) {
        if (cred_no_required_oi_match(cred, bss))
          continue;
        if (!ignore_bw &&
            cred_below_min_backhaul(wpa_s, cred, bss))
          continue;
        if (!ignore_bw &&
            cred_over_max_bss_load(wpa_s, cred, bss))
          continue;
        if (!ignore_bw &&
            cred_conn_capab_missing(wpa_s, cred, bss))
          continue;
        if (cred_excluded_ssid(cred, bss)) {
          if (excluded == NULL)
            continue;
          if (selected == NULL) {
            selected = cred;
            is_excluded = 1;
          }
        } else {
          if (selected == NULL || is_excluded ||
              cred_prio_cmp(selected, cred) < 0)
          {
            selected = cred;
            is_excluded = 0;
          }
        }
        break;
      } else {
        wpa_msg(wpa_s, MSG_DEBUG,
          "Interworking: realm-find-eap returned false");
      }
    }
  }

  nai_realm_free(realm, count);

  if (excluded)
    *excluded = is_excluded;

  return selected;
}


static struct wpa_cred * interworking_credentials_available_helper(
  struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw,
  int *excluded)
{
  struct wpa_cred *cred, *cred2;
  int excluded1, excluded2 = 0;

  if (disallowed_bssid(wpa_s, bss->bssid) ||
      disallowed_ssid(wpa_s, bss->ssid, bss->ssid_len)) {
    wpa_printf(MSG_DEBUG, "Interworking: Ignore disallowed BSS "
         MACSTR, MAC2STR(bss->bssid));
    return NULL;
  }

  cred = interworking_credentials_available_realm(wpa_s, bss, ignore_bw,
              &excluded1);
  cred2 = interworking_credentials_available_3gpp(wpa_s, bss, ignore_bw,
              &excluded2);
  if (cred && cred2 &&
      (cred_prio_cmp(cred2, cred) >= 0 || (!excluded2 && excluded1))) {
    cred = cred2;
    excluded1 = excluded2;
  }
  if (!cred) {
    cred = cred2;
    excluded1 = excluded2;
  }

  cred2 = interworking_credentials_available_roaming_consortium(
    wpa_s, bss, ignore_bw, &excluded2);
  if (cred && cred2 &&
      (cred_prio_cmp(cred2, cred) >= 0 || (!excluded2 && excluded1))) {
    cred = cred2;
    excluded1 = excluded2;
  }
  if (!cred) {
    cred = cred2;
    excluded1 = excluded2;
  }

  if (excluded)
    *excluded = excluded1;
  return cred;
}


static struct wpa_cred * interworking_credentials_available(
  struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int *excluded)
{
  struct wpa_cred *cred;

  if (excluded)
    *excluded = 0;
  cred = interworking_credentials_available_helper(wpa_s, bss, 0,
               excluded);
  if (cred)
    return cred;
  return interworking_credentials_available_helper(wpa_s, bss, 1,
               excluded);
}


int domain_name_list_contains(struct wpabuf *domain_names,
            const char *domain, int exact_match)
{
  const u8 *pos, *end;
  size_t len;

  len = os_strlen(domain);
  pos = wpabuf_head(domain_names);
  end = pos + wpabuf_len(domain_names);

  while (end - pos > 1) {
    u8 elen;

    elen = *pos++;
    if (elen > end - pos)
      break;

    wpa_hexdump_ascii(MSG_DEBUG, "Interworking: AP domain name",
          pos, elen);
    if (elen == len &&
        os_strncasecmp(domain, (const char *) pos, len) == 0)
      return 1;
    if (!exact_match && elen > len && pos[elen - len - 1] == '.') {
      const char *ap = (const char *) pos;
      int offset = elen - len;

      if (os_strncasecmp(domain, ap + offset, len) == 0)
        return 1;
    }

    pos += elen;
  }

  return 0;
}


int interworking_home_sp_cred(struct wpa_supplicant *wpa_s,
            struct wpa_cred *cred,
            struct wpabuf *domain_names)
{
  size_t i;
  int ret = -1;
#ifdef INTERWORKING_3GPP
  char nai[100], *realm;

  char *imsi = NULL;
  int mnc_len = 0;
  if (cred->imsi)
    imsi = cred->imsi;
#ifdef PCSC_FUNCS
  else if (cred->pcsc && wpa_s->scard) {
    if (interworking_pcsc_read_imsi(wpa_s) < 0)
      return -1;
    imsi = wpa_s->imsi;
    mnc_len = wpa_s->mnc_len;
  }
#endif /* PCSC_FUNCS */
#ifdef CONFIG_EAP_PROXY
  else if (cred->pcsc && wpa_s->mnc_len > 0 && wpa_s->imsi[0]) {
    imsi = wpa_s->imsi;
    mnc_len = wpa_s->mnc_len;
  }
#endif /* CONFIG_EAP_PROXY */
  if (domain_names &&
      imsi && build_root_nai(nai, sizeof(nai), imsi, mnc_len, 0) == 0) {
    realm = os_strchr(nai, '@');
    if (realm)
      realm++;
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: Search for match with SIM/USIM domain %s",
      realm ? realm : "[NULL]");
    if (realm &&
        domain_name_list_contains(domain_names, realm, 1))
      return 1;
    if (realm)
      ret = 0;
  }
#endif /* INTERWORKING_3GPP */

  if (domain_names == NULL || cred->domain == NULL)
    return ret;

  for (i = 0; i < cred->num_domain; i++) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: Search for match with home SP FQDN %s",
      cred->domain[i]);
    if (domain_name_list_contains(domain_names, cred->domain[i], 1))
      return 1;
  }

  return 0;
}


static int interworking_home_sp(struct wpa_supplicant *wpa_s,
        struct wpabuf *domain_names)
{
  struct wpa_cred *cred;

  if (domain_names == NULL || wpa_s->conf->cred == NULL)
    return -1;

  for (cred = wpa_s->conf->cred; cred; cred = cred->next) {
    int res = interworking_home_sp_cred(wpa_s, cred, domain_names);
    if (res)
      return res;
  }

  return 0;
}


static int interworking_find_network_match(struct wpa_supplicant *wpa_s)
{
  struct wpa_bss *bss;
  struct wpa_ssid *ssid;

  dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
    for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
      if (wpas_network_disabled(wpa_s, ssid) ||
          ssid->mode != WPAS_MODE_INFRA)
        continue;
      if (ssid->ssid_len != bss->ssid_len ||
          os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) !=
          0)
        continue;
      /*
       * TODO: Consider more accurate matching of security
       * configuration similarly to what is done in events.c
       */
      return 1;
    }
  }

  return 0;
}


static int roaming_partner_match(struct wpa_supplicant *wpa_s,
         struct roaming_partner *partner,
         struct wpabuf *domain_names)
{
  wpa_printf(MSG_DEBUG, "Interworking: Comparing roaming_partner info fqdn='%s' exact_match=%d priority=%u country='%s'",
       partner->fqdn, partner->exact_match, partner->priority,
       partner->country);
  wpa_hexdump_ascii(MSG_DEBUG, "Interworking: Domain names",
        wpabuf_head(domain_names),
        wpabuf_len(domain_names));
  if (!domain_name_list_contains(domain_names, partner->fqdn,
               partner->exact_match))
    return 0;
  /* TODO: match Country */
  return 1;
}


static u8 roaming_prio(struct wpa_supplicant *wpa_s, struct wpa_cred *cred,
           struct wpa_bss *bss)
{
  size_t i;

  if (bss->anqp == NULL || bss->anqp->domain_name == NULL) {
    wpa_printf(MSG_DEBUG, "Interworking: No ANQP domain name info -> use default roaming partner priority 128");
    return 128; /* cannot check preference with domain name */
  }

  if (interworking_home_sp_cred(wpa_s, cred, bss->anqp->domain_name) > 0)
  {
    wpa_printf(MSG_DEBUG, "Interworking: Determined to be home SP -> use maximum preference 0 as roaming partner priority");
    return 0; /* max preference for home SP network */
  }

  for (i = 0; i < cred->num_roaming_partner; i++) {
    if (roaming_partner_match(wpa_s, &cred->roaming_partner[i],
            bss->anqp->domain_name)) {
      wpa_printf(MSG_DEBUG, "Interworking: Roaming partner preference match - priority %u",
           cred->roaming_partner[i].priority);
      return cred->roaming_partner[i].priority;
    }
  }

  wpa_printf(MSG_DEBUG, "Interworking: No roaming partner preference match - use default roaming partner priority 128");
  return 128;
}


static struct wpa_bss * pick_best_roaming_partner(struct wpa_supplicant *wpa_s,
              struct wpa_bss *selected,
              struct wpa_cred *cred)
{
  struct wpa_bss *bss;
  u8 best_prio, prio;
  struct wpa_cred *cred2;

  /*
   * Check if any other BSS is operated by a more preferred roaming
   * partner.
   */

  best_prio = roaming_prio(wpa_s, cred, selected);
  wpa_printf(MSG_DEBUG, "Interworking: roaming_prio=%u for selected BSS "
       MACSTR " (cred=%d)", best_prio, MAC2STR(selected->bssid),
       cred->id);

  dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
    if (bss == selected)
      continue;
    cred2 = interworking_credentials_available(wpa_s, bss, NULL);
    if (!cred2)
      continue;
    if (!wpa_bss_get_ie(bss, WLAN_EID_RSN))
      continue;
    prio = roaming_prio(wpa_s, cred2, bss);
    wpa_printf(MSG_DEBUG, "Interworking: roaming_prio=%u for BSS "
         MACSTR " (cred=%d)", prio, MAC2STR(bss->bssid),
         cred2->id);
    if (prio < best_prio) {
      int bh1, bh2, load1, load2, conn1, conn2;
      bh1 = cred_below_min_backhaul(wpa_s, cred, selected);
      load1 = cred_over_max_bss_load(wpa_s, cred, selected);
      conn1 = cred_conn_capab_missing(wpa_s, cred, selected);
      bh2 = cred_below_min_backhaul(wpa_s, cred2, bss);
      load2 = cred_over_max_bss_load(wpa_s, cred2, bss);
      conn2 = cred_conn_capab_missing(wpa_s, cred2, bss);
      wpa_printf(MSG_DEBUG, "Interworking: old: %d %d %d  new: %d %d %d",
           bh1, load1, conn1, bh2, load2, conn2);
      if (bh1 || load1 || conn1 || !(bh2 || load2 || conn2)) {
        wpa_printf(MSG_DEBUG, "Interworking: Better roaming partner " MACSTR " selected", MAC2STR(bss->bssid));
        best_prio = prio;
        selected = bss;
      }
    }
  }

  return selected;
}


static void interworking_select_network(struct wpa_supplicant *wpa_s)
{
  struct wpa_bss *bss, *selected = NULL, *selected_home = NULL;
  struct wpa_bss *selected2 = NULL, *selected2_home = NULL;
  unsigned int count = 0;
  const char *type;
  int res;
  struct wpa_cred *cred, *selected_cred = NULL;
  struct wpa_cred *selected_home_cred = NULL;
  struct wpa_cred *selected2_cred = NULL;
  struct wpa_cred *selected2_home_cred = NULL;

  wpa_s->network_select = 0;

  wpa_printf(MSG_DEBUG, "Interworking: Select network (auto_select=%d)",
       wpa_s->auto_select);
  dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
    int excluded = 0;
    int bh, bss_load, conn_capab;
    cred = interworking_credentials_available(wpa_s, bss,
                &excluded);
    if (!cred)
      continue;

    if (!wpa_bss_get_ie(bss, WLAN_EID_RSN)) {
      /*
       * We currently support only HS 2.0 networks and those
       * are required to use WPA2-Enterprise.
       */
      wpa_msg(wpa_s, MSG_DEBUG,
        "Interworking: Credential match with " MACSTR
        " but network does not use RSN",
        MAC2STR(bss->bssid));
      continue;
    }
    if (!excluded)
      count++;
    res = interworking_home_sp(wpa_s, bss->anqp ?
             bss->anqp->domain_name : NULL);
    if (res > 0)
      type = "home";
    else if (res == 0)
      type = "roaming";
    else
      type = "unknown";
    bh = cred_below_min_backhaul(wpa_s, cred, bss);
    bss_load = cred_over_max_bss_load(wpa_s, cred, bss);
    conn_capab = cred_conn_capab_missing(wpa_s, cred, bss);
    wpas_notify_interworking_ap_added(wpa_s, bss, cred, excluded,
              type, bh, bss_load,
              conn_capab);
    if (excluded)
      continue;
    if (wpa_s->auto_select ||
        (wpa_s->conf->auto_interworking &&
         wpa_s->auto_network_select)) {
      if (bh || bss_load || conn_capab) {
        if (selected2_cred == NULL ||
            cred_prio_cmp(cred, selected2_cred) > 0) {
          wpa_printf(MSG_DEBUG, "Interworking: Mark as selected2");
          selected2 = bss;
          selected2_cred = cred;
        }
        if (res > 0 &&
            (selected2_home_cred == NULL ||
             cred_prio_cmp(cred, selected2_home_cred) >
             0)) {
          wpa_printf(MSG_DEBUG, "Interworking: Mark as selected2_home");
          selected2_home = bss;
          selected2_home_cred = cred;
        }
      } else {
        if (selected_cred == NULL ||
            cred_prio_cmp(cred, selected_cred) > 0) {
          wpa_printf(MSG_DEBUG, "Interworking: Mark as selected");
          selected = bss;
          selected_cred = cred;
        }
        if (res > 0 &&
            (selected_home_cred == NULL ||
             cred_prio_cmp(cred, selected_home_cred) >
             0)) {
          wpa_printf(MSG_DEBUG, "Interworking: Mark as selected_home");
          selected_home = bss;
          selected_home_cred = cred;
        }
      }
    }
  }

  if (selected_home && selected_home != selected &&
      selected_home_cred &&
      (selected_cred == NULL ||
       cred_prio_cmp(selected_home_cred, selected_cred) >= 0)) {
    /* Prefer network operated by the Home SP */
    wpa_printf(MSG_DEBUG, "Interworking: Overrode selected with selected_home");
    selected = selected_home;
    selected_cred = selected_home_cred;
  }

  if (!selected) {
    if (selected2_home) {
      wpa_printf(MSG_DEBUG, "Interworking: Use home BSS with BW limit mismatch since no other network could be selected");
      selected = selected2_home;
      selected_cred = selected2_home_cred;
    } else if (selected2) {
      wpa_printf(MSG_DEBUG, "Interworking: Use visited BSS with BW limit mismatch since no other network could be selected");
      selected = selected2;
      selected_cred = selected2_cred;
    }
  }

  if (count == 0) {
    /*
     * No matching network was found based on configured
     * credentials. Check whether any of the enabled network blocks
     * have matching APs.
     */
    if (interworking_find_network_match(wpa_s)) {
      wpa_msg(wpa_s, MSG_DEBUG,
        "Interworking: Possible BSS match for enabled network configurations");
      if (wpa_s->auto_select) {
        interworking_reconnect(wpa_s);
        return;
      }
    }

    if (wpa_s->auto_network_select) {
      wpa_msg(wpa_s, MSG_DEBUG,
        "Interworking: Continue scanning after ANQP fetch");
      wpa_supplicant_req_scan(wpa_s, wpa_s->scan_interval,
            0);
      return;
    }

    wpa_msg(wpa_s, MSG_INFO, INTERWORKING_NO_MATCH "No network "
      "with matching credentials found");
    if (wpa_s->wpa_state == WPA_SCANNING)
      wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
  }

  wpas_notify_interworking_select_done(wpa_s);

  if (selected) {
    wpa_printf(MSG_DEBUG, "Interworking: Selected " MACSTR,
         MAC2STR(selected->bssid));
    selected = pick_best_roaming_partner(wpa_s, selected,
                 selected_cred);
    wpa_printf(MSG_DEBUG, "Interworking: Selected " MACSTR
         " (after best roaming partner selection)",
         MAC2STR(selected->bssid));
    wpa_msg(wpa_s, MSG_INFO, INTERWORKING_SELECTED MACSTR,
      MAC2STR(selected->bssid));
    interworking_connect(wpa_s, selected, 0);
  } else if (wpa_s->wpa_state == WPA_SCANNING)
    wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
}


static struct wpa_bss_anqp *
interworking_match_anqp_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
{
  struct wpa_bss *other;

  if (is_zero_ether_addr(bss->hessid))
    return NULL; /* Cannot be in the same homegenous ESS */

  dl_list_for_each(other, &wpa_s->bss, struct wpa_bss, list) {
    if (other == bss)
      continue;
    if (other->anqp == NULL)
      continue;
    if (other->anqp->roaming_consortium == NULL &&
        other->anqp->nai_realm == NULL &&
        other->anqp->anqp_3gpp == NULL &&
        other->anqp->domain_name == NULL)
      continue;
    if (!(other->flags & WPA_BSS_ANQP_FETCH_TRIED))
      continue;
    if (os_memcmp(bss->hessid, other->hessid, ETH_ALEN) != 0)
      continue;
    if (bss->ssid_len != other->ssid_len ||
        os_memcmp(bss->ssid, other->ssid, bss->ssid_len) != 0)
      continue;

    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: Share ANQP data with already fetched BSSID "
      MACSTR " and " MACSTR,
      MAC2STR(other->bssid), MAC2STR(bss->bssid));
    other->anqp->users++;
    return other->anqp;
  }

  return NULL;
}


static void interworking_next_anqp_fetch(struct wpa_supplicant *wpa_s)
{
  struct wpa_bss *bss;
  int found = 0;

  wpa_printf(MSG_DEBUG, "Interworking: next_anqp_fetch - "
       "fetch_anqp_in_progress=%d fetch_osu_icon_in_progress=%d",
       wpa_s->fetch_anqp_in_progress,
       wpa_s->fetch_osu_icon_in_progress);

  if (eloop_terminated() || !wpa_s->fetch_anqp_in_progress) {
    wpa_printf(MSG_DEBUG, "Interworking: Stop next-ANQP-fetch");
    return;
  }

#ifdef CONFIG_HS20
  if (wpa_s->fetch_osu_icon_in_progress) {
    wpa_printf(MSG_DEBUG, "Interworking: Next icon (in progress)");
    hs20_next_osu_icon(wpa_s);
    return;
  }
#endif /* CONFIG_HS20 */

  dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
    if (!(bss->caps & IEEE80211_CAP_ESS))
      continue;
    if (!wpa_bss_ext_capab(bss, WLAN_EXT_CAPAB_INTERWORKING))
      continue; /* AP does not support Interworking */
    if (disallowed_bssid(wpa_s, bss->bssid) ||
        disallowed_ssid(wpa_s, bss->ssid, bss->ssid_len))
      continue; /* Disallowed BSS */

    if (!(bss->flags & WPA_BSS_ANQP_FETCH_TRIED)) {
      if (bss->anqp == NULL) {
        bss->anqp = interworking_match_anqp_info(wpa_s,
                   bss);
        if (bss->anqp) {
          /* Shared data already fetched */
          continue;
        }
        bss->anqp = wpa_bss_anqp_alloc();
        if (bss->anqp == NULL)
          break;
      }
      found++;
      bss->flags |= WPA_BSS_ANQP_FETCH_TRIED;
      wpa_msg(wpa_s, MSG_INFO, "Starting ANQP fetch for "
        MACSTR " (HESSID " MACSTR ")",
        MAC2STR(bss->bssid), MAC2STR(bss->hessid));
      interworking_anqp_send_req(wpa_s, bss);
      break;
    }
  }

  if (found == 0) {
#ifdef CONFIG_HS20
    if (wpa_s->fetch_osu_info) {
      if (wpa_s->num_prov_found == 0 &&
          wpa_s->fetch_osu_waiting_scan &&
          wpa_s->num_osu_scans < 3) {
        wpa_printf(MSG_DEBUG, "HS 2.0: No OSU providers seen - try to scan again");
        hs20_start_osu_scan(wpa_s);
        return;
      }
      wpa_printf(MSG_DEBUG, "Interworking: Next icon");
      hs20_osu_icon_fetch(wpa_s);
      return;
    }
#endif /* CONFIG_HS20 */
    wpa_msg(wpa_s, MSG_INFO, "ANQP fetch completed");
    wpa_s->fetch_anqp_in_progress = 0;
    if (wpa_s->network_select)
      interworking_select_network(wpa_s);
  }
}


void interworking_start_fetch_anqp(struct wpa_supplicant *wpa_s)
{
  struct wpa_bss *bss;

  dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list)
    bss->flags &= ~WPA_BSS_ANQP_FETCH_TRIED;

  wpa_s->fetch_anqp_in_progress = 1;

  /*
   * Start actual ANQP operation from eloop call to make sure the loop
   * does not end up using excessive recursion.
   */
  eloop_register_timeout(0, 0, interworking_continue_anqp, wpa_s, NULL);
}


int interworking_fetch_anqp(struct wpa_supplicant *wpa_s)
{
  if (wpa_s->fetch_anqp_in_progress || wpa_s->network_select)
    return 0;

  wpa_s->network_select = 0;
  wpa_s->fetch_all_anqp = 1;
  wpa_s->fetch_osu_info = 0;

  interworking_start_fetch_anqp(wpa_s);

  return 0;
}


void interworking_stop_fetch_anqp(struct wpa_supplicant *wpa_s)
{
  if (!wpa_s->fetch_anqp_in_progress)
    return;

  wpa_s->fetch_anqp_in_progress = 0;
}


int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst, int freq,
      u16 info_ids[], size_t num_ids, u32 subtypes,
      u32 mbo_subtypes)
{
  struct wpabuf *buf;
  struct wpabuf *extra_buf = NULL;
  int ret = 0;
  struct wpa_bss *bss;
  int res;

  bss = wpa_bss_get_bssid(wpa_s, dst);
  if (!bss && !freq) {
    wpa_printf(MSG_WARNING,
         "ANQP: Cannot send query without BSS freq info");
    return -1;
  }

  if (bss)
    wpa_bss_anqp_unshare_alloc(bss);
  if (bss && !freq)
    freq = bss->freq;

  wpa_msg(wpa_s, MSG_DEBUG,
    "ANQP: Query Request to " MACSTR " for %u id(s)",
    MAC2STR(dst), (unsigned int) num_ids);

#ifdef CONFIG_HS20
  if (subtypes != 0) {
    extra_buf = wpabuf_alloc(100);
    if (extra_buf == NULL)
      return -1;
    hs20_put_anqp_req(subtypes, NULL, 0, extra_buf);
  }
#endif /* CONFIG_HS20 */

#ifdef CONFIG_MBO
  if (mbo_subtypes) {
    struct wpabuf *mbo;

    if (!bss) {
      wpa_printf(MSG_WARNING,
           "ANQP: Cannot send MBO query to unknown BSS "
           MACSTR, MAC2STR(dst));
      wpabuf_free(extra_buf);
      return -1;
    }

    mbo = mbo_build_anqp_buf(wpa_s, bss, mbo_subtypes);
    if (mbo) {
      if (wpabuf_resize(&extra_buf, wpabuf_len(mbo))) {
        wpabuf_free(extra_buf);
        wpabuf_free(mbo);
        return -1;
      }
      wpabuf_put_buf(extra_buf, mbo);
      wpabuf_free(mbo);
    }
  }
#endif /* CONFIG_MBO */

  buf = anqp_build_req(info_ids, num_ids, extra_buf);
  wpabuf_free(extra_buf);
  if (buf == NULL)
    return -1;

  res = gas_query_req(wpa_s->gas, dst, freq, 0, 0, buf, anqp_resp_cb,
          wpa_s);
  if (res < 0) {
    wpa_msg(wpa_s, MSG_DEBUG, "ANQP: Failed to send Query Request");
    wpabuf_free(buf);
    ret = -1;
  } else {
    wpa_msg(wpa_s, MSG_DEBUG,
      "ANQP: Query started with dialog token %u", res);
  }

  return ret;
}


static void anqp_add_extra(struct wpa_supplicant *wpa_s,
         struct wpa_bss_anqp *anqp, u16 info_id,
         const u8 *data, size_t slen, bool protected_response)
{
  struct wpa_bss_anqp_elem *tmp, *elem = NULL;

  if (!anqp)
    return;

  dl_list_for_each(tmp, &anqp->anqp_elems, struct wpa_bss_anqp_elem,
       list) {
    if (tmp->infoid == info_id) {
      elem = tmp;
      break;
    }
  }

  if (!elem) {
    elem = os_zalloc(sizeof(*elem));
    if (!elem)
      return;
    elem->infoid = info_id;
    dl_list_add(&anqp->anqp_elems, &elem->list);
  } else {
    wpabuf_free(elem->payload);
  }

  elem->protected_response = protected_response;
  elem->payload = wpabuf_alloc_copy(data, slen);
  if (!elem->payload) {
    dl_list_del(&elem->list);
    os_free(elem);
  }
}


static void interworking_parse_venue_url(struct wpa_supplicant *wpa_s,
           const u8 *data, size_t len)
{
  const u8 *pos = data, *end = data + len;
  char url[255];

  while (end - pos >= 2) {
    u8 slen, num;

    slen = *pos++;
    if (slen < 1 || slen > end - pos) {
      wpa_printf(MSG_DEBUG,
           "ANQP: Truncated Venue URL Duple field");
      return;
    }

    num = *pos++;
    os_memcpy(url, pos, slen - 1);
    url[slen - 1] = '\0';
    wpa_msg(wpa_s, MSG_INFO, RX_VENUE_URL "%u %s", num, url);
    pos += slen - 1;
  }
}


static void interworking_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
              struct wpa_bss *bss, const u8 *sa,
              u16 info_id,
              const u8 *data, size_t slen,
              u8 dialog_token)
{
  const u8 *pos = data;
  struct wpa_bss_anqp *anqp = NULL;
  u8 type;
  bool protected_response;

  if (bss)
    anqp = bss->anqp;

  switch (info_id) {
  case ANQP_CAPABILITY_LIST:
    wpa_msg(wpa_s, MSG_INFO, RX_ANQP MACSTR
      " ANQP Capability list", MAC2STR(sa));
    wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Capability list",
          pos, slen);
    if (anqp) {
      wpabuf_free(anqp->capability_list);
      anqp->capability_list = wpabuf_alloc_copy(pos, slen);
    }
    break;
  case ANQP_VENUE_NAME:
    wpa_msg(wpa_s, MSG_INFO, RX_ANQP MACSTR
      " Venue Name", MAC2STR(sa));
    wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Venue Name", pos, slen);
    if (anqp) {
      wpabuf_free(anqp->venue_name);
      anqp->venue_name = wpabuf_alloc_copy(pos, slen);
    }
    break;
  case ANQP_NETWORK_AUTH_TYPE:
    wpa_msg(wpa_s, MSG_INFO, RX_ANQP MACSTR
      " Network Authentication Type information",
      MAC2STR(sa));
    wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Network Authentication "
          "Type", pos, slen);
    if (anqp) {
      wpabuf_free(anqp->network_auth_type);
      anqp->network_auth_type = wpabuf_alloc_copy(pos, slen);
    }
    break;
  case ANQP_ROAMING_CONSORTIUM:
    wpa_msg(wpa_s, MSG_INFO, RX_ANQP MACSTR
      " Roaming Consortium list", MAC2STR(sa));
    wpa_hexdump_ascii(MSG_DEBUG, "ANQP: Roaming Consortium",
          pos, slen);
    if (anqp) {
      wpabuf_free(anqp->roaming_consortium);
      anqp->roaming_consortium = wpabuf_alloc_copy(pos, slen);
    }
    break;
  case ANQP_IP_ADDR_TYPE_AVAILABILITY:
    wpa_msg(wpa_s, MSG_INFO, RX_ANQP MACSTR
      " IP Address Type Availability information",
      MAC2STR(sa));
    wpa_hexdump(MSG_MSGDUMP, "ANQP: IP Address Availability",
          pos, slen);
    if (anqp) {
      wpabuf_free(anqp->ip_addr_type_availability);
      anqp->ip_addr_type_availability =
        wpabuf_alloc_copy(pos, slen);
    }
    break;
  case ANQP_NAI_REALM:
    wpa_msg(wpa_s, MSG_INFO, RX_ANQP MACSTR
      " NAI Realm list", MAC2STR(sa));
    wpa_hexdump_ascii(MSG_DEBUG, "ANQP: NAI Realm", pos, slen);
    if (anqp) {
      wpabuf_free(anqp->nai_realm);
      anqp->nai_realm = wpabuf_alloc_copy(pos, slen);
    }
    break;
  case ANQP_3GPP_CELLULAR_NETWORK:
    wpa_msg(wpa_s, MSG_INFO, RX_ANQP MACSTR
      " 3GPP Cellular Network information", MAC2STR(sa));
    wpa_hexdump_ascii(MSG_DEBUG, "ANQP: 3GPP Cellular Network",
          pos, slen);
    if (anqp) {
      wpabuf_free(anqp->anqp_3gpp);
      anqp->anqp_3gpp = wpabuf_alloc_copy(pos, slen);
    }
    break;
  case ANQP_DOMAIN_NAME:
    wpa_msg(wpa_s, MSG_INFO, RX_ANQP MACSTR
      " Domain Name list", MAC2STR(sa));
    wpa_hexdump_ascii(MSG_MSGDUMP, "ANQP: Domain Name", pos, slen);
    if (anqp) {
      wpabuf_free(anqp->domain_name);
      anqp->domain_name = wpabuf_alloc_copy(pos, slen);
    }
    break;
#ifdef CONFIG_FILS
  case ANQP_FILS_REALM_INFO:
    wpa_msg(wpa_s, MSG_INFO, RX_ANQP MACSTR
      " FILS Realm Information", MAC2STR(sa));
    wpa_hexdump_ascii(MSG_MSGDUMP, "ANQP: FILS Realm Information",
      pos, slen);
    if (anqp) {
      wpabuf_free(anqp->fils_realm_info);
      anqp->fils_realm_info = wpabuf_alloc_copy(pos, slen);
    }
    break;
#endif /* CONFIG_FILS */
  case ANQP_VENUE_URL:
    wpa_msg(wpa_s, MSG_INFO, RX_ANQP MACSTR " Venue URL",
      MAC2STR(sa));
    protected_response = pmf_in_use(wpa_s, sa);
    anqp_add_extra(wpa_s, anqp, info_id, pos, slen,
             protected_response);

    if (!protected_response) {
      wpa_printf(MSG_DEBUG,
           "ANQP: Ignore Venue URL since PMF was not enabled");
      break;
    }
    interworking_parse_venue_url(wpa_s, pos, slen);
    break;
  case ANQP_VENDOR_SPECIFIC:
    if (slen < 3)
      return;

    switch (WPA_GET_BE24(pos)) {
    case OUI_WFA:
      pos += 3;
      slen -= 3;

      if (slen < 1)
        return;
      type = *pos++;
      slen--;

      switch (type) {
#ifdef CONFIG_HS20
      case HS20_ANQP_OUI_TYPE:
        hs20_parse_rx_hs20_anqp_resp(wpa_s, bss, sa,
                   pos, slen,
                   dialog_token);
        break;
#endif /* CONFIG_HS20 */
#ifdef CONFIG_MBO
      case MBO_ANQP_OUI_TYPE:
        mbo_parse_rx_anqp_resp(wpa_s, bss, sa,
                   pos, slen);
        break;
#endif /* CONFIG_MBO */
      default:
        wpa_msg(wpa_s, MSG_DEBUG,
          "ANQP: Unsupported ANQP vendor type %u",
          type);
        break;
      }
      break;
    default:
      wpa_msg(wpa_s, MSG_DEBUG,
        "Interworking: Unsupported vendor-specific ANQP OUI %06x",
        WPA_GET_BE24(pos));
      return;
    }
    break;
  default:
    wpa_msg(wpa_s, MSG_DEBUG,
      "Interworking: Unsupported ANQP Info ID %u", info_id);
    anqp_add_extra(wpa_s, anqp, info_id, data, slen,
             pmf_in_use(wpa_s, sa));
    break;
  }
}


void anqp_resp_cb(void *ctx, const u8 *dst, u8 dialog_token,
      enum gas_query_result result,
      const struct wpabuf *adv_proto,
      const struct wpabuf *resp, u16 status_code)
{
  struct wpa_supplicant *wpa_s = ctx;
  const u8 *pos;
  const u8 *end;
  u16 info_id;
  u16 slen;
  struct wpa_bss *bss = NULL, *tmp;
  const char *anqp_result = "SUCCESS";

  wpa_printf(MSG_DEBUG, "Interworking: anqp_resp_cb dst=" MACSTR
       " dialog_token=%u result=%d status_code=%u",
       MAC2STR(dst), dialog_token, result, status_code);
  if (result != GAS_QUERY_SUCCESS) {
#ifdef CONFIG_HS20
    if (wpa_s->fetch_osu_icon_in_progress)
      hs20_icon_fetch_failed(wpa_s);
#endif /* CONFIG_HS20 */
    anqp_result = "FAILURE";
    goto out;
  }

  pos = wpabuf_head(adv_proto);
  if (wpabuf_len(adv_proto) < 4 || pos[0] != WLAN_EID_ADV_PROTO ||
      pos[1] < 2 || pos[3] != ACCESS_NETWORK_QUERY_PROTOCOL) {
    wpa_msg(wpa_s, MSG_DEBUG,
      "ANQP: Unexpected Advertisement Protocol in response");
#ifdef CONFIG_HS20
    if (wpa_s->fetch_osu_icon_in_progress)
      hs20_icon_fetch_failed(wpa_s);
#endif /* CONFIG_HS20 */
    anqp_result = "INVALID_FRAME";
    goto out;
  }

  /*
   * If possible, select the BSS entry based on which BSS entry was used
   * for the request. This can help in cases where multiple BSS entries
   * may exist for the same AP.
   */
  dl_list_for_each_reverse(tmp, &wpa_s->bss, struct wpa_bss, list) {
    if (tmp == wpa_s->interworking_gas_bss &&
        os_memcmp(tmp->bssid, dst, ETH_ALEN) == 0) {
      bss = tmp;
      break;
    }
  }
  if (bss == NULL)
    bss = wpa_bss_get_bssid(wpa_s, dst);

  pos = wpabuf_head(resp);
  end = pos + wpabuf_len(resp);

  while (pos < end) {
    unsigned int left = end - pos;

    if (left < 4) {
      wpa_msg(wpa_s, MSG_DEBUG, "ANQP: Invalid element");
      anqp_result = "INVALID_FRAME";
      goto out_parse_done;
    }
    info_id = WPA_GET_LE16(pos);
    pos += 2;
    slen = WPA_GET_LE16(pos);
    pos += 2;
    left -= 4;
    if (left < slen) {
      wpa_msg(wpa_s, MSG_DEBUG,
        "ANQP: Invalid element length for Info ID %u",
        info_id);
      anqp_result = "INVALID_FRAME";
      goto out_parse_done;
    }
    interworking_parse_rx_anqp_resp(wpa_s, bss, dst, info_id, pos,
            slen, dialog_token);
    pos += slen;
  }

out_parse_done:
#ifdef CONFIG_HS20
  hs20_notify_parse_done(wpa_s);
#endif /* CONFIG_HS20 */
out:
  wpa_msg(wpa_s, MSG_INFO, ANQP_QUERY_DONE "addr=" MACSTR " result=%s",
    MAC2STR(dst), anqp_result);
}


static void interworking_scan_res_handler(struct wpa_supplicant *wpa_s,
            struct wpa_scan_results *scan_res)
{
  wpa_msg(wpa_s, MSG_DEBUG,
    "Interworking: Scan results available - start ANQP fetch");
  interworking_start_fetch_anqp(wpa_s);
}


int interworking_select(struct wpa_supplicant *wpa_s, int auto_select,
      int *freqs)
{
  interworking_stop_fetch_anqp(wpa_s);
  wpa_s->network_select = 1;
  wpa_s->auto_network_select = 0;
  wpa_s->auto_select = !!auto_select;
  wpa_s->fetch_all_anqp = 0;
  wpa_s->fetch_osu_info = 0;
  wpa_msg(wpa_s, MSG_DEBUG,
    "Interworking: Start scan for network selection");
  wpa_s->scan_res_handler = interworking_scan_res_handler;
  wpa_s->normal_scans = 0;
  wpa_s->scan_req = MANUAL_SCAN_REQ;
  os_free(wpa_s->manual_scan_freqs);
  wpa_s->manual_scan_freqs = freqs;
  wpa_s->after_wps = 0;
  wpa_s->known_wps_freq = 0;
  wpa_supplicant_req_scan(wpa_s, 0, 0);

  return 0;
}


static void gas_resp_cb(void *ctx, const u8 *addr, u8 dialog_token,
      enum gas_query_result result,
      const struct wpabuf *adv_proto,
      const struct wpabuf *resp, u16 status_code)
{
  struct wpa_supplicant *wpa_s = ctx;
  struct wpabuf *n;

  wpa_msg(wpa_s, MSG_INFO, GAS_RESPONSE_INFO "addr=" MACSTR
    " dialog_token=%d status_code=%d resp_len=%d",
    MAC2STR(addr), dialog_token, status_code,
    resp ? (int) wpabuf_len(resp) : -1);
  if (!resp)
    return;

  n = wpabuf_dup(resp);
  if (n == NULL)
    return;
  wpabuf_free(wpa_s->prev_gas_resp);
  wpa_s->prev_gas_resp = wpa_s->last_gas_resp;
  os_memcpy(wpa_s->prev_gas_addr, wpa_s->last_gas_addr, ETH_ALEN);
  wpa_s->prev_gas_dialog_token = wpa_s->last_gas_dialog_token;
  wpa_s->last_gas_resp = n;
  os_memcpy(wpa_s->last_gas_addr, addr, ETH_ALEN);
  wpa_s->last_gas_dialog_token = dialog_token;
}


int gas_send_request(struct wpa_supplicant *wpa_s, const u8 *dst,
         const struct wpabuf *adv_proto,
         const struct wpabuf *query)
{
  struct wpabuf *buf;
  int ret = 0;
  int freq;
  struct wpa_bss *bss;
  int res;
  size_t len;
  u8 query_resp_len_limit = 0;

  freq = wpa_s->assoc_freq;
  bss = wpa_bss_get_bssid(wpa_s, dst);
  if (bss)
    freq = bss->freq;
  if (freq <= 0)
    return -1;

  wpa_msg(wpa_s, MSG_DEBUG, "GAS request to " MACSTR " (freq %d MHz)",
    MAC2STR(dst), freq);
  wpa_hexdump_buf(MSG_DEBUG, "Advertisement Protocol ID", adv_proto);
  wpa_hexdump_buf(MSG_DEBUG, "GAS Query", query);

  len = 3 + wpabuf_len(adv_proto) + 2;
  if (query)
    len += wpabuf_len(query);
  buf = gas_build_initial_req(0, len);
  if (buf == NULL)
    return -1;

  /* Advertisement Protocol IE */
  wpabuf_put_u8(buf, WLAN_EID_ADV_PROTO);
  wpabuf_put_u8(buf, 1 + wpabuf_len(adv_proto)); /* Length */
  wpabuf_put_u8(buf, query_resp_len_limit & 0x7f);
  wpabuf_put_buf(buf, adv_proto);

  /* GAS Query */
  if (query) {
    wpabuf_put_le16(buf, wpabuf_len(query));
    wpabuf_put_buf(buf, query);
  } else
    wpabuf_put_le16(buf, 0);

  res = gas_query_req(wpa_s->gas, dst, freq, 0, 0, buf, gas_resp_cb,
          wpa_s);
  if (res < 0) {
    wpa_msg(wpa_s, MSG_DEBUG, "GAS: Failed to send Query Request");
    wpabuf_free(buf);
    ret = -1;
  } else
    wpa_msg(wpa_s, MSG_DEBUG,
      "GAS: Query started with dialog token %u", res);

  return ret;
}

Coverage Report

Created: 2023-03-26 06:22