/*

 * WPA Supplicant - RSN PMKSA cache

 * Copyright (c) 2004-2009, 2011-2015, 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 "eloop.h"

#include "eapol_supp/eapol_supp_sm.h"

#include "wpa.h"

#include "wpa_i.h"

#include "pmksa_cache.h"

#if defined(IEEE8021X_EAPOL) && !defined(CONFIG_NO_WPA)

static const int pmksa_cache_max_entries = 32;

struct rsn_pmksa_cache {

  struct rsn_pmksa_cache_entry *pmksa; /* PMKSA cache */

  int pmksa_count; /* number of entries in PMKSA cache */

  struct wpa_sm *sm; /* TODO: get rid of this reference(?) */

  void (*free_cb)(struct rsn_pmksa_cache_entry *entry, void *ctx,

      enum pmksa_free_reason reason);

  bool (*is_current_cb)(struct rsn_pmksa_cache_entry *entry,

            void *ctx);

  void (*notify_cb)(struct rsn_pmksa_cache_entry *entry, void *ctx);

  void *ctx;

};

static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa);

static void _pmksa_cache_free_entry(struct rsn_pmksa_cache_entry *entry)

{

  bin_clear_free(entry, sizeof(*entry));

}

static void pmksa_cache_free_entry(struct rsn_pmksa_cache *pmksa,

           struct rsn_pmksa_cache_entry *entry,

           enum pmksa_free_reason reason)

{

  if (pmksa->sm)

    wpa_sm_remove_pmkid(pmksa->sm, entry->network_ctx, entry->aa,

            entry->pmkid,

            entry->fils_cache_id_set ?

            entry->fils_cache_id : NULL);

  pmksa->pmksa_count--;

  if (pmksa->free_cb)

    pmksa->free_cb(entry, pmksa->ctx, reason);

  _pmksa_cache_free_entry(entry);

}

void pmksa_cache_remove(struct rsn_pmksa_cache *pmksa,

      struct rsn_pmksa_cache_entry *entry)

{

  struct rsn_pmksa_cache_entry *e;

  e = pmksa->pmksa;

  while (e) {

    if (e == entry) {

      pmksa->pmksa = entry->next;

      break;

    }

    if (e->next == entry) {

      e->next = entry->next;

      break;

    }

  }

  if (!e) {

    wpa_printf(MSG_DEBUG,

         "RSN: Could not remove PMKSA cache entry %p since it is not in the list",

         entry);

    return;

  }

  pmksa_cache_free_entry(pmksa, entry, PMKSA_FREE);

}

static void pmksa_cache_expire(void *eloop_ctx, void *timeout_ctx)

{

  struct rsn_pmksa_cache *pmksa = eloop_ctx;

  struct os_reltime now;

  struct rsn_pmksa_cache_entry *prev = NULL, *tmp;

  struct rsn_pmksa_cache_entry *entry = pmksa->pmksa;

  os_get_reltime(&now);

  while (entry && entry->expiration <= now.sec) {

    if (wpa_key_mgmt_sae(entry->akmp) && pmksa->is_current_cb &&

        pmksa->is_current_cb(entry, pmksa->ctx)) {

      /* Do not expire the currently used PMKSA entry for SAE

       * since there is no convenient mechanism for

       * reauthenticating during an association with SAE. The

       * expired entry will be removed after this association

       * has been lost. */

      wpa_printf(MSG_DEBUG,

           "RSN: postpone PMKSA cache entry expiration for SAE with "

           MACSTR, MAC2STR(entry->aa));

      prev = entry;

      entry = entry->next;

      continue;

    }

    wpa_printf(MSG_DEBUG, "RSN: expired PMKSA cache entry for "

         MACSTR, MAC2STR(entry->aa));

    if (prev)

      prev->next = entry->next;

    else

      pmksa->pmksa = entry->next;

    tmp = entry;

    entry = entry->next;

    pmksa_cache_free_entry(pmksa, tmp, PMKSA_EXPIRE);

  }

  pmksa_cache_set_expiration(pmksa);

}

static void pmksa_cache_reauth(void *eloop_ctx, void *timeout_ctx)

{

  struct rsn_pmksa_cache *pmksa = eloop_ctx;

  if (!pmksa->sm)

    return;

  if (pmksa->sm->driver_bss_selection) {

    struct rsn_pmksa_cache_entry *entry;

    entry = pmksa->sm->cur_pmksa ?

      pmksa->sm->cur_pmksa :

      pmksa_cache_get(pmksa, pmksa->sm->bssid, NULL, NULL,

          NULL, 0);

    if (entry && wpa_key_mgmt_sae(entry->akmp)) {

      wpa_printf(MSG_DEBUG,

           "RSN: remove reauth threshold passed PMKSA from the driver for SAE");

      entry->sae_reauth_scheduled = true;

      wpa_sm_remove_pmkid(pmksa->sm, entry->network_ctx,

              entry->aa, entry->pmkid, NULL);

      return;

    }

  }

  pmksa->sm->cur_pmksa = NULL;

  eapol_sm_request_reauth(pmksa->sm->eapol);

}

static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa)

{

  int sec;

  struct rsn_pmksa_cache_entry *entry;

  struct os_reltime now;

  eloop_cancel_timeout(pmksa_cache_expire, pmksa, NULL);

  eloop_cancel_timeout(pmksa_cache_reauth, pmksa, NULL);

  if (pmksa->pmksa == NULL)

    return;

  os_get_reltime(&now);

  sec = pmksa->pmksa->expiration - now.sec;

  if (sec < 0) {

    sec = 0;

    if (wpa_key_mgmt_sae(pmksa->pmksa->akmp) &&

        pmksa->is_current_cb &&

        pmksa->is_current_cb(pmksa->pmksa, pmksa->ctx)) {

      /* Do not continue polling for the current PMKSA entry

       * from SAE to expire every second. Use the expiration

       * time to the following entry, if any, and wait at

       * maximum 10 minutes to check again.

       */

      entry = pmksa->pmksa->next;

      if (entry) {

        sec = entry->expiration - now.sec;

        if (sec < 0)

          sec = 0;

        else if (sec > 600)

          sec = 600;

      } else {

        sec = 600;

      }

    }

  }

  eloop_register_timeout(sec + 1, 0, pmksa_cache_expire, pmksa, NULL);

  if (!pmksa->sm)

    return;

  entry = pmksa->sm->cur_pmksa ? pmksa->sm->cur_pmksa :

    pmksa_cache_get(pmksa, pmksa->sm->bssid, NULL, NULL, NULL, 0);

  if (entry &&

      (!wpa_key_mgmt_sae(entry->akmp) ||

       (pmksa->sm->driver_bss_selection &&

        !entry->sae_reauth_scheduled))) {

    sec = pmksa->pmksa->reauth_time - now.sec;

    if (sec < 0)

      sec = 0;

    eloop_register_timeout(sec, 0, pmksa_cache_reauth, pmksa,

               NULL);

  }

}

/**

 * pmksa_cache_add - Add a PMKSA cache entry

 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()

 * @pmk: The new pairwise master key

 * @pmk_len: PMK length in bytes, usually PMK_LEN (32)

 * @pmkid: Calculated PMKID

 * @kck: Key confirmation key or %NULL if not yet derived

 * @kck_len: KCK length in bytes

 * @aa: Authenticator address

 * @spa: Supplicant address

 * @network_ctx: Network configuration context for this PMK

 * @akmp: WPA_KEY_MGMT_* used in key derivation

 * @cache_id: Pointer to FILS Cache Identifier or %NULL if not advertised

 * Returns: Pointer to the added PMKSA cache entry or %NULL on error

 *

 * This function create a PMKSA entry for a new PMK and adds it to the PMKSA

 * cache. If an old entry is already in the cache for the same Authenticator,

 * this entry will be replaced with the new entry. PMKID will be calculated

 * based on the PMK and the driver interface is notified of the new PMKID.

 */

struct rsn_pmksa_cache_entry *

pmksa_cache_add(struct rsn_pmksa_cache *pmksa, const u8 *pmk, size_t pmk_len,

    const u8 *pmkid, const u8 *kck, size_t kck_len,

    const u8 *aa, const u8 *spa, void *network_ctx, int akmp,

    const u8 *cache_id)

{

  struct rsn_pmksa_cache_entry *entry;

  struct os_reltime now;

  unsigned int pmk_lifetime = 43200;

  unsigned int pmk_reauth_threshold = 70;

  if (pmk_len > PMK_LEN_MAX)

    return NULL;

  if (kck_len > WPA_KCK_MAX_LEN)

    return NULL;

  if (wpa_key_mgmt_suite_b(akmp) && !kck)

    return NULL;

  entry = os_zalloc(sizeof(*entry));

  if (entry == NULL)

    return NULL;

  os_memcpy(entry->pmk, pmk, pmk_len);

  entry->pmk_len = pmk_len;

  if (kck_len > 0)

    os_memcpy(entry->kck, kck, kck_len);

  entry->kck_len = kck_len;

  if (pmkid)

    os_memcpy(entry->pmkid, pmkid, PMKID_LEN);

  else if (akmp == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192)

    rsn_pmkid_suite_b_192(kck, kck_len, aa, spa, entry->pmkid);

  else if (wpa_key_mgmt_suite_b(akmp))

    rsn_pmkid_suite_b(kck, kck_len, aa, spa, entry->pmkid);

  else

    rsn_pmkid(pmk, pmk_len, aa, spa, entry->pmkid, akmp);

  os_get_reltime(&now);

  if (pmksa->sm) {

    pmk_lifetime = pmksa->sm->dot11RSNAConfigPMKLifetime;

    pmk_reauth_threshold =

      pmksa->sm->dot11RSNAConfigPMKReauthThreshold;

  }

  entry->expiration = now.sec + pmk_lifetime;

  entry->reauth_time = now.sec +

    pmk_lifetime * pmk_reauth_threshold / 100;

  entry->akmp = akmp;

  if (cache_id) {

    entry->fils_cache_id_set = 1;

    os_memcpy(entry->fils_cache_id, cache_id, FILS_CACHE_ID_LEN);

  }

  os_memcpy(entry->aa, aa, ETH_ALEN);

  os_memcpy(entry->spa, spa, ETH_ALEN);

  entry->network_ctx = network_ctx;

  return pmksa_cache_add_entry(pmksa, entry);

}

struct rsn_pmksa_cache_entry *

pmksa_cache_add_entry(struct rsn_pmksa_cache *pmksa,

          struct rsn_pmksa_cache_entry *entry)

{

  struct rsn_pmksa_cache_entry *pos, *prev;

  /* Replace an old entry for the same Authenticator (if found) with the

   * new entry */

  pos = pmksa->pmksa;

  prev = NULL;

  while (pos) {

    if (ether_addr_equal(entry->aa, pos->aa) &&

        ether_addr_equal(entry->spa, pos->spa)) {

      if (pos->pmk_len == entry->pmk_len &&

          os_memcmp_const(pos->pmk, entry->pmk,

              entry->pmk_len) == 0 &&

          os_memcmp_const(pos->pmkid, entry->pmkid,

              PMKID_LEN) == 0) {

        wpa_printf(MSG_DEBUG, "WPA: reusing previous "

             "PMKSA entry");

        os_free(entry);

        return pos;

      }

      if (prev == NULL)

        pmksa->pmksa = pos->next;

      else

        prev->next = pos->next;

      /*

       * If OKC is used, there may be other PMKSA cache

       * entries based on the same PMK. These needs to be

       * flushed so that a new entry can be created based on

       * the new PMK. Only clear other entries if they have a

       * matching PMK and this PMK has been used successfully

       * with the current AP, i.e., if opportunistic flag has

       * been cleared in wpa_supplicant_key_neg_complete().

       */

      wpa_printf(MSG_DEBUG, "RSN: Replace PMKSA entry for "

           "the current AP and any PMKSA cache entry "

           "that was based on the old PMK");

      if (!pos->opportunistic)

        pmksa_cache_flush(pmksa, entry->network_ctx,

              pos->pmk, pos->pmk_len,

              false);

      pmksa_cache_free_entry(pmksa, pos, PMKSA_REPLACE);

      break;

    }

    prev = pos;

    pos = pos->next;

  }

  if (pmksa->pmksa_count >= pmksa_cache_max_entries && pmksa->pmksa) {

    /* Remove the oldest entry to make room for the new entry */

    pos = pmksa->pmksa;

    if (pmksa->sm && pos == pmksa->sm->cur_pmksa) {

      /*

       * Never remove the current PMKSA cache entry, since

       * it's in use, and removing it triggers a needless

       * deauthentication.

       */

      pos = pos->next;

      pmksa->pmksa->next = pos ? pos->next : NULL;

    } else

      pmksa->pmksa = pos->next;

    if (pos) {

      wpa_printf(MSG_DEBUG, "RSN: removed the oldest idle "

           "PMKSA cache entry (for " MACSTR ") to "

           "make room for new one",

           MAC2STR(pos->aa));

      pmksa_cache_free_entry(pmksa, pos, PMKSA_FREE);

    }

  }

  /* Add the new entry; order by expiration time */

  pos = pmksa->pmksa;

  prev = NULL;

  while (pos) {

    if (pos->expiration > entry->expiration)

      break;

    prev = pos;

    pos = pos->next;

  }

  if (prev == NULL) {

    entry->next = pmksa->pmksa;

    pmksa->pmksa = entry;

    pmksa_cache_set_expiration(pmksa);

  } else {

    entry->next = prev->next;

    prev->next = entry;

  }

  pmksa->pmksa_count++;

  wpa_printf(MSG_DEBUG, "RSN: Added PMKSA cache entry for " MACSTR

       " spa=" MACSTR " network_ctx=%p akmp=0x%x",

       MAC2STR(entry->aa), MAC2STR(entry->spa),

       entry->network_ctx, entry->akmp);

  if (!pmksa->sm)

    return entry;

  if (pmksa->notify_cb)

    pmksa->notify_cb(entry, pmksa->ctx);

  wpa_sm_add_pmkid(pmksa->sm, entry->network_ctx, entry->aa, entry->pmkid,

       entry->fils_cache_id_set ? entry->fils_cache_id : NULL,

       entry->pmk, entry->pmk_len,

       pmksa->sm->dot11RSNAConfigPMKLifetime,

       pmksa->sm->dot11RSNAConfigPMKReauthThreshold,

       entry->akmp);

  return entry;

}

/**

 * pmksa_cache_flush - Flush PMKSA cache entries for a specific network

 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()

 * @network_ctx: Network configuration context or %NULL to flush all entries

 * @pmk: PMK to match for or %NULL to match all PMKs

 * @pmk_len: PMK length

 * @external_only: Flush only PMKSA cache entries configured by external

 * applications

 */

void pmksa_cache_flush(struct rsn_pmksa_cache *pmksa, void *network_ctx,

           const u8 *pmk, size_t pmk_len, bool external_only)

{

  struct rsn_pmksa_cache_entry *entry, *prev = NULL, *tmp;

  int removed = 0;

  entry = pmksa->pmksa;

  while (entry) {

    if ((entry->network_ctx == network_ctx ||

         network_ctx == NULL) &&

        (pmk == NULL ||

         (pmk_len == entry->pmk_len &&

          os_memcmp(pmk, entry->pmk, pmk_len) == 0)) &&

        (!external_only || entry->external)) {

      wpa_printf(MSG_DEBUG, "RSN: Flush PMKSA cache entry "

           "for " MACSTR, MAC2STR(entry->aa));

      if (prev)

        prev->next = entry->next;

      else

        pmksa->pmksa = entry->next;

      tmp = entry;

      entry = entry->next;

      pmksa_cache_free_entry(pmksa, tmp, PMKSA_FREE);

      removed++;

    } else {

      prev = entry;

      entry = entry->next;

    }

  }

  if (removed)

    pmksa_cache_set_expiration(pmksa);

}

/**

 * pmksa_cache_deinit - Free all entries in PMKSA cache

 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()

 */

void pmksa_cache_deinit(struct rsn_pmksa_cache *pmksa)

{

  struct rsn_pmksa_cache_entry *entry, *prev;

  if (pmksa == NULL)

    return;

  entry = pmksa->pmksa;

  pmksa->pmksa = NULL;

  while (entry) {

    prev = entry;

    entry = entry->next;

    os_free(prev);

  }

  pmksa_cache_set_expiration(pmksa);

  os_free(pmksa);

}

/**

 * pmksa_cache_get - Fetch a PMKSA cache entry

 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()

 * @aa: Authenticator address or %NULL to match any

 * @pmkid: PMKID or %NULL to match any

 * @network_ctx: Network context or %NULL to match any

 * @akmp: Specific AKMP to search for or 0 for any

 * Returns: Pointer to PMKSA cache entry or %NULL if no match was found

 */

struct rsn_pmksa_cache_entry * pmksa_cache_get(struct rsn_pmksa_cache *pmksa,

                 const u8 *aa, const u8 *spa,

                 const u8 *pmkid,

                 const void *network_ctx,

                 int akmp)

{

  struct rsn_pmksa_cache_entry *entry = pmksa->pmksa;

  while (entry) {

    if ((aa == NULL || ether_addr_equal(entry->aa, aa)) &&

        (!spa || ether_addr_equal(entry->spa, spa)) &&

        (pmkid == NULL ||

         os_memcmp(entry->pmkid, pmkid, PMKID_LEN) == 0) &&

        (!akmp || akmp == entry->akmp) &&

        (network_ctx == NULL || network_ctx == entry->network_ctx))

      return entry;

    entry = entry->next;

  }

  return NULL;

}

static struct rsn_pmksa_cache_entry *

pmksa_cache_clone_entry(struct rsn_pmksa_cache *pmksa,

      const struct rsn_pmksa_cache_entry *old_entry,

      const u8 *aa)

{

  struct rsn_pmksa_cache_entry *new_entry;

  os_time_t old_expiration = old_entry->expiration;

  os_time_t old_reauth_time = old_entry->reauth_time;

  const u8 *pmkid = NULL;

  if (!pmksa->sm)

    return NULL;

  if (wpa_key_mgmt_sae(old_entry->akmp) ||

      wpa_key_mgmt_fils(old_entry->akmp))

    pmkid = old_entry->pmkid;

  new_entry = pmksa_cache_add(pmksa, old_entry->pmk, old_entry->pmk_len,

            pmkid, old_entry->kck, old_entry->kck_len,

            aa, pmksa->sm->own_addr,

            old_entry->network_ctx, old_entry->akmp,

            old_entry->fils_cache_id_set ?

            old_entry->fils_cache_id : NULL);

  if (new_entry == NULL)

    return NULL;

  /* TODO: reorder entries based on expiration time? */

  new_entry->expiration = old_expiration;

  new_entry->reauth_time = old_reauth_time;

  new_entry->opportunistic = 1;

  return new_entry;

}

/**

 * pmksa_cache_get_opportunistic - Try to get an opportunistic PMKSA entry

 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()

 * @network_ctx: Network configuration context

 * @aa: Authenticator address for the new AP

 * @akmp: Specific AKMP to search for or 0 for any

 * Returns: Pointer to a new PMKSA cache entry or %NULL if not available

 *

 * Try to create a new PMKSA cache entry opportunistically by guessing that the

 * new AP is sharing the same PMK as another AP that has the same SSID and has

 * already an entry in PMKSA cache.

 */

struct rsn_pmksa_cache_entry *

pmksa_cache_get_opportunistic(struct rsn_pmksa_cache *pmksa, void *network_ctx,

            const u8 *aa, int akmp)

{

  struct rsn_pmksa_cache_entry *entry = pmksa->pmksa;

  wpa_printf(MSG_DEBUG, "RSN: Consider " MACSTR " for OKC", MAC2STR(aa));

  if (network_ctx == NULL)

    return NULL;

  while (entry) {

    if (entry->network_ctx == network_ctx &&

        (!akmp || entry->akmp == akmp)) {

      struct os_reltime now;

      if (wpa_key_mgmt_sae(entry->akmp) &&

          os_get_reltime(&now) == 0 &&

          entry->reauth_time < now.sec) {

        wpa_printf(MSG_DEBUG,

             "RSN: Do not clone PMKSA cache entry for "

             MACSTR

             " since its reauth threshold has passed",

             MAC2STR(entry->aa));

        entry = entry->next;

        continue;

      }

      entry = pmksa_cache_clone_entry(pmksa, entry, aa);

      if (entry) {

        wpa_printf(MSG_DEBUG, "RSN: added "

             "opportunistic PMKSA cache entry "

             "for " MACSTR, MAC2STR(aa));

      }

      return entry;

    }

    entry = entry->next;

  }

  return NULL;

}

static struct rsn_pmksa_cache_entry *

pmksa_cache_get_fils_cache_id(struct rsn_pmksa_cache *pmksa,

            const void *network_ctx, const u8 *cache_id)

{

  struct rsn_pmksa_cache_entry *entry;

  for (entry = pmksa->pmksa; entry; entry = entry->next) {

    if (network_ctx == entry->network_ctx &&

        entry->fils_cache_id_set &&

        os_memcmp(cache_id, entry->fils_cache_id,

            FILS_CACHE_ID_LEN) == 0)

      return entry;

  }

  return NULL;

}

/**

 * pmksa_cache_get_current - Get the current used PMKSA entry

 * @sm: Pointer to WPA state machine data from wpa_sm_init()

 * Returns: Pointer to the current PMKSA cache entry or %NULL if not available

 */

struct rsn_pmksa_cache_entry * pmksa_cache_get_current(struct wpa_sm *sm)

{

  if (sm == NULL)

    return NULL;

  return sm->cur_pmksa;

}

/**

 * pmksa_cache_clear_current - Clear the current PMKSA entry selection

 * @sm: Pointer to WPA state machine data from wpa_sm_init()

 */

void pmksa_cache_clear_current(struct wpa_sm *sm)

{

  if (sm == NULL)

    return;

  if (sm->cur_pmksa)

    wpa_printf(MSG_DEBUG,

         "RSN: Clear current PMKSA entry selection");

  sm->cur_pmksa = NULL;

}

/**

 * pmksa_cache_set_current - Set the current PMKSA entry selection

 * @sm: Pointer to WPA state machine data from wpa_sm_init()

 * @pmkid: PMKID for selecting PMKSA or %NULL if not used

 * @bssid: BSSID for PMKSA or %NULL if not used

 * @network_ctx: Network configuration context

 * @try_opportunistic: Whether to allow opportunistic PMKSA caching

 * @fils_cache_id: Pointer to FILS Cache Identifier or %NULL if not used

 * @associated: Whether the device is associated

 * Returns: 0 if PMKSA was found or -1 if no matching entry was found

 */

int pmksa_cache_set_current(struct wpa_sm *sm, const u8 *pmkid,

          const u8 *bssid, void *network_ctx,

          int try_opportunistic, const u8 *fils_cache_id,

          int akmp, bool associated)

{

  struct rsn_pmksa_cache *pmksa = sm->pmksa;

  wpa_printf(MSG_DEBUG, "RSN: PMKSA cache search - network_ctx=%p "

       "try_opportunistic=%d akmp=0x%x",

       network_ctx, try_opportunistic, akmp);

  if (pmkid)

    wpa_hexdump(MSG_DEBUG, "RSN: Search for PMKID",

          pmkid, PMKID_LEN);

  if (bssid)

    wpa_printf(MSG_DEBUG, "RSN: Search for BSSID " MACSTR,

         MAC2STR(bssid));

  if (fils_cache_id)

    wpa_printf(MSG_DEBUG,

         "RSN: Search for FILS Cache Identifier %02x%02x",

         fils_cache_id[0], fils_cache_id[1]);

  sm->cur_pmksa = NULL;

  if (pmkid)

    sm->cur_pmksa = pmksa_cache_get(pmksa, NULL, sm->own_addr,

            pmkid, network_ctx, akmp);

  if (sm->cur_pmksa == NULL && bssid)

    sm->cur_pmksa = pmksa_cache_get(pmksa, bssid, sm->own_addr,

            NULL, network_ctx, akmp);

  if (sm->cur_pmksa == NULL && try_opportunistic && bssid)

    sm->cur_pmksa = pmksa_cache_get_opportunistic(pmksa,

                    network_ctx,

                    bssid, akmp);

  if (sm->cur_pmksa == NULL && fils_cache_id)

    sm->cur_pmksa = pmksa_cache_get_fils_cache_id(pmksa,

                    network_ctx,

                    fils_cache_id);

  if (sm->cur_pmksa) {

    struct os_reltime now;

    if (wpa_key_mgmt_sae(sm->cur_pmksa->akmp) &&

        os_get_reltime(&now) == 0 &&

        sm->cur_pmksa->reauth_time < now.sec) {

      /* Driver-based roaming might have used a PMKSA entry

       * that is already past the reauthentication threshold.

       * Remove the related PMKID from the driver to avoid

       * further uses for this PMKSA, but allow the

       * association to continue since the PMKSA has not yet

       * expired. */

      wpa_sm_remove_pmkid(sm, sm->cur_pmksa->network_ctx,

              sm->cur_pmksa->aa,

              sm->cur_pmksa->pmkid, NULL);

      if (associated) {

        wpa_printf(MSG_DEBUG,

             "RSN: Associated with " MACSTR

             " using reauth threshold passed PMKSA cache entry",

             MAC2STR(sm->cur_pmksa->aa));

      } else {

        wpa_printf(MSG_DEBUG,

             "RSN: Do not allow PMKSA cache entry for "

             MACSTR

             " to be used for SAE since its reauth threshold has passed",

             MAC2STR(sm->cur_pmksa->aa));

        sm->cur_pmksa = NULL;

        return -1;

      }

    }

    wpa_hexdump(MSG_DEBUG, "RSN: PMKSA cache entry found - PMKID",

          sm->cur_pmksa->pmkid, PMKID_LEN);

    return 0;

  }

  wpa_printf(MSG_DEBUG, "RSN: No PMKSA cache entry found");

  return -1;

}

/**

 * pmksa_cache_list - Dump text list of entries in PMKSA cache

 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()

 * @buf: Buffer for the list

 * @len: Length of the buffer

 * Returns: number of bytes written to buffer

 *

 * This function is used to generate a text format representation of the

 * current PMKSA cache contents for the ctrl_iface PMKSA command.

 */

int pmksa_cache_list(struct rsn_pmksa_cache *pmksa, char *buf, size_t len)

{

  int i, ret;

  char *pos = buf;

  struct rsn_pmksa_cache_entry *entry;

  struct os_reltime now;

  int cache_id_used = 0;

  for (entry = pmksa->pmksa; entry; entry = entry->next) {

    if (entry->fils_cache_id_set) {

      cache_id_used = 1;

      break;

    }

  }

  os_get_reltime(&now);

  ret = os_snprintf(pos, buf + len - pos,

        "Index / AA / PMKID / expiration (in seconds) / "

        "opportunistic%s\n",

        cache_id_used ? " / FILS Cache Identifier" : "");

  if (os_snprintf_error(buf + len - pos, ret))

    return pos - buf;

  pos += ret;

  i = 0;

  entry = pmksa->pmksa;

  while (entry) {

    i++;

    ret = os_snprintf(pos, buf + len - pos, "%d " MACSTR " ",

          i, MAC2STR(entry->aa));

    if (os_snprintf_error(buf + len - pos, ret))

      return pos - buf;

    pos += ret;

    pos += wpa_snprintf_hex(pos, buf + len - pos, entry->pmkid,

          PMKID_LEN);

    ret = os_snprintf(pos, buf + len - pos, " %d %d",

          (int) (entry->expiration - now.sec),

          entry->opportunistic);

    if (os_snprintf_error(buf + len - pos, ret))

      return pos - buf;

    pos += ret;

    if (entry->fils_cache_id_set) {

      ret = os_snprintf(pos, buf + len - pos, " %02x%02x",

            entry->fils_cache_id[0],

            entry->fils_cache_id[1]);

      if (os_snprintf_error(buf + len - pos, ret))

        return pos - buf;

      pos += ret;

    }

    ret = os_snprintf(pos, buf + len - pos, "\n");

    if (os_snprintf_error(buf + len - pos, ret))

      return pos - buf;

    pos += ret;

    entry = entry->next;

  }

  return pos - buf;

}

struct rsn_pmksa_cache_entry * pmksa_cache_head(struct rsn_pmksa_cache *pmksa)

{

  return pmksa->pmksa;

}

/**

 * pmksa_cache_init - Initialize PMKSA cache

 * @free_cb: Callback function to be called when a PMKSA cache entry is freed

 * @ctx: Context pointer for free_cb function

 * @sm: Pointer to WPA state machine data from wpa_sm_init()

 * Returns: Pointer to PMKSA cache data or %NULL on failure

 */

struct rsn_pmksa_cache *

pmksa_cache_init(void (*free_cb)(struct rsn_pmksa_cache_entry *entry,

         void *ctx, enum pmksa_free_reason reason),

     bool (*is_current_cb)(struct rsn_pmksa_cache_entry *entry,

               void *ctx),

     void (*notify_cb)(struct rsn_pmksa_cache_entry *entry,

           void *ctx),

     void *ctx, struct wpa_sm *sm)

{

  struct rsn_pmksa_cache *pmksa;

  pmksa = os_zalloc(sizeof(*pmksa));

  if (pmksa) {

    pmksa->free_cb = free_cb;

    pmksa->is_current_cb = is_current_cb;

    pmksa->notify_cb = notify_cb;

    pmksa->ctx = ctx;

    pmksa->sm = sm;

  }

  return pmksa;

}

void pmksa_cache_reconfig(struct rsn_pmksa_cache *pmksa)

{

  struct rsn_pmksa_cache_entry *entry;

  struct os_reltime now;

  if (!pmksa || !pmksa->pmksa)

    return;

  os_get_reltime(&now);

  for (entry = pmksa->pmksa; entry; entry = entry->next) {

    u32 life_time;

    u8 reauth_threshold;

    if (entry->expiration - now.sec < 1 ||

        entry->reauth_time - now.sec < 1)

      continue;

    life_time = entry->expiration - now.sec;

    reauth_threshold = (entry->reauth_time - now.sec) * 100 /

      life_time;

    if (!reauth_threshold)

      continue;

    wpa_sm_add_pmkid(pmksa->sm, entry->network_ctx, entry->aa,

         entry->pmkid,

         entry->fils_cache_id_set ?

         entry->fils_cache_id : NULL,

         entry->pmk, entry->pmk_len, life_time,

         reauth_threshold, entry->akmp);

  }

}

#else /* IEEE8021X_EAPOL */

struct rsn_pmksa_cache *

pmksa_cache_init(void (*free_cb)(struct rsn_pmksa_cache_entry *entry,

         void *ctx, enum pmksa_free_reason reason),

     bool (*is_current_cb)(struct rsn_pmksa_cache_entry *entry,

               void *ctx),

     void (*notify_cb)(struct rsn_pmksa_cache_entry *entry,

           void *ctx),

     void *ctx, struct wpa_sm *sm)

{

  return (void *) -1;

}

void pmksa_cache_deinit(struct rsn_pmksa_cache *pmksa)

{

}

struct rsn_pmksa_cache_entry *

pmksa_cache_get(struct rsn_pmksa_cache *pmksa, const u8 *aa, const u8 *spa,

    const u8 *pmkid, const void *network_ctx, int akmp)

{

  return NULL;

}

struct rsn_pmksa_cache_entry *

pmksa_cache_get_current(struct wpa_sm *sm)

{

  return NULL;

}

int pmksa_cache_list(struct rsn_pmksa_cache *pmksa, char *buf, size_t len)

{

  return -1;

}

struct rsn_pmksa_cache_entry *

pmksa_cache_head(struct rsn_pmksa_cache *pmksa)

{

  return NULL;

}

struct rsn_pmksa_cache_entry *

pmksa_cache_add_entry(struct rsn_pmksa_cache *pmksa,