text: /*
   * IEEE 802.11 RSN / WPA Authenticator
   * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
   *
   * This software may be distributed under the terms of the BSD license.
   * See README for more details.
   */
  
  #include "utils/includes.h"
  
  #include "utils/common.h"
  #include "utils/eloop.h"
  #include "utils/state_machine.h"
  #include "utils/bitfield.h"
  #include "common/ieee802_11_defs.h"
  #include "crypto/aes_wrap.h"
  #include "crypto/crypto.h"
  #include "crypto/sha1.h"
  #include "crypto/sha256.h"
  #include "crypto/random.h"
  #include "eapol_auth/eapol_auth_sm.h"
  #include "ap_config.h"
  #include "ieee802_11.h"
  #include "wpa_auth.h"
  #include "pmksa_cache_auth.h"
  #include "wpa_auth_i.h"
  #include "wpa_auth_ie.h"
  
  #define STATE_MACHINE_DATA struct wpa_state_machine
  #define STATE_MACHINE_DEBUG_PREFIX "WPA"
  #define STATE_MACHINE_ADDR sm->addr
  
  
  static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
  static int wpa_sm_step(struct wpa_state_machine *sm);
  static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data,
  			      size_t data_len);
  static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
  static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
  			      struct wpa_group *group);
  static void wpa_request_new_ptk(struct wpa_state_machine *sm);
  static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
  			  struct wpa_group *group);
  static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
  				       struct wpa_group *group);
  static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
  			  const u8 *pmk, unsigned int pmk_len,
  			  struct wpa_ptk *ptk);
  static void wpa_group_free(struct wpa_authenticator *wpa_auth,
  			   struct wpa_group *group);
  static void wpa_group_get(struct wpa_authenticator *wpa_auth,
  			  struct wpa_group *group);
  static void wpa_group_put(struct wpa_authenticator *wpa_auth,
  			  struct wpa_group *group);
  
  static const u32 dot11RSNAConfigGroupUpdateCount = 4;
  static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
  static const u32 eapol_key_timeout_first = 100; /* ms */
  static const u32 eapol_key_timeout_subseq = 1000; /* ms */
  static const u32 eapol_key_timeout_first_group = 500; /* ms */
  
  /* TODO: make these configurable */
  static const int dot11RSNAConfigPMKLifetime = 43200;
  static const int dot11RSNAConfigPMKReauthThreshold = 70;
  static const int dot11RSNAConfigSATimeout = 60;
  
  
  static inline int wpa_auth_mic_failure_report(
  	struct wpa_authenticator *wpa_auth, const u8 *addr)
  {
  	if (wpa_auth->cb.mic_failure_report)
  		return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr);
  	return 0;
  }
  
  
  static inline void wpa_auth_psk_failure_report(
  	struct wpa_authenticator *wpa_auth, const u8 *addr)
  {
  	if (wpa_auth->cb.psk_failure_report)
  		wpa_auth->cb.psk_failure_report(wpa_auth->cb.ctx, addr);
  }
  
  
  static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
  				      const u8 *addr, wpa_eapol_variable var,
  				      int value)
  {
  	if (wpa_auth->cb.set_eapol)
  		wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value);
  }
  
  
  static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
  				     const u8 *addr, wpa_eapol_variable var)
  {
  	if (wpa_auth->cb.get_eapol == NULL)
  		return -1;
  	return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var);
  }
  
  
  static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
  					  const u8 *addr,
  					  const u8 *p2p_dev_addr,
  					  const u8 *prev_psk)
  {
  	if (wpa_auth->cb.get_psk == NULL)
  		return NULL;
  	return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, p2p_dev_addr,
  				    prev_psk);
  }
  
  
  static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
  				   const u8 *addr, u8 *msk, size_t *len)
  {
  	if (wpa_auth->cb.get_msk == NULL)
  		return -1;
  	return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len);
  }
  
  
  static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
  				   int vlan_id,
  				   enum wpa_alg alg, const u8 *addr, int idx,
  				   u8 *key, size_t key_len)
  {
  	if (wpa_auth->cb.set_key == NULL)
  		return -1;
  	return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
  				    key, key_len);
  }
  
  
  static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
  				      const u8 *addr, int idx, u8 *seq)
  {
  	if (wpa_auth->cb.get_seqnum == NULL)
  		return -1;
  	return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
  }
  
  
  static inline int
  wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
  		    const u8 *data, size_t data_len, int encrypt)
  {
  	if (wpa_auth->cb.send_eapol == NULL)
  		return -1;
  	return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len,
  				       encrypt);
  }
  
  
  #ifdef CONFIG_MESH
  static inline int wpa_auth_start_ampe(struct wpa_authenticator *wpa_auth,
  				      const u8 *addr)
  {
  	if (wpa_auth->cb.start_ampe == NULL)
  		return -1;
  	return wpa_auth->cb.start_ampe(wpa_auth->cb.ctx, addr);
  }
  #endif /* CONFIG_MESH */
  
  
  int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
  			  int (*cb)(struct wpa_state_machine *sm, void *ctx),
  			  void *cb_ctx)
  {
  	if (wpa_auth->cb.for_each_sta == NULL)
  		return 0;
  	return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx);
  }
  
  
  int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
  			   int (*cb)(struct wpa_authenticator *a, void *ctx),
  			   void *cb_ctx)
  {
  	if (wpa_auth->cb.for_each_auth == NULL)
  		return 0;
  	return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx);
  }
  
  
  void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
  		     logger_level level, const char *txt)
  {
  	if (wpa_auth->cb.logger == NULL)
  		return;
  	wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt);
  }
  
  
  void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
  		      logger_level level, const char *fmt, ...)
  {
  	char *format;
  	int maxlen;
  	va_list ap;
  
  	if (wpa_auth->cb.logger == NULL)
  		return;
  
  	maxlen = os_strlen(fmt) + 100;
  	format = os_malloc(maxlen);
  	if (!format)
  		return;
  
  	va_start(ap, fmt);
  	vsnprintf(format, maxlen, fmt, ap);
  	va_end(ap);
  
  	wpa_auth_logger(wpa_auth, addr, level, format);
  
  	os_free(format);
  }
  
  
  static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
  			       const u8 *addr)
  {
  	if (wpa_auth->cb.disconnect == NULL)
  		return;
  	wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
  	wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr,
  				WLAN_REASON_PREV_AUTH_NOT_VALID);
  }
  
  
  static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
  {
  	int ret = 0;
  #ifdef CONFIG_IEEE80211R
  	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
  		ret = 1;
  #endif /* CONFIG_IEEE80211R */
  #ifdef CONFIG_IEEE80211W
  	if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
  		ret = 1;
  #endif /* CONFIG_IEEE80211W */
  	if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN)
  		ret = 1;
  	return ret;
  }
  
  
  static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
  {
  	struct wpa_authenticator *wpa_auth = eloop_ctx;
  
  	if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
  		wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
  			   "initialization.");
  	} else {
  		wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
  		wpa_hexdump_key(MSG_DEBUG, "GMK",
  				wpa_auth->group->GMK, WPA_GMK_LEN);
  	}
  
  	if (wpa_auth->conf.wpa_gmk_rekey) {
  		eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
  				       wpa_rekey_gmk, wpa_auth, NULL);
  	}
  }
  
  
  static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
  {
  	struct wpa_authenticator *wpa_auth = eloop_ctx;
  	struct wpa_group *group, *next;
  
  	wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
  	group = wpa_auth->group;
  	while (group) {
  		wpa_group_get(wpa_auth, group);
  
  		group->GTKReKey = TRUE;
  		do {
  			group->changed = FALSE;
  			wpa_group_sm_step(wpa_auth, group);
  		} while (group->changed);
  
  		next = group->next;
  		wpa_group_put(wpa_auth, group);
  		group = next;
  	}
  
  	if (wpa_auth->conf.wpa_group_rekey) {
  		eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
  				       0, wpa_rekey_gtk, wpa_auth, NULL);
  	}
  }
  
  
  static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
  {
  	struct wpa_authenticator *wpa_auth = eloop_ctx;
  	struct wpa_state_machine *sm = timeout_ctx;
  
  	wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
  	wpa_request_new_ptk(sm);
  	wpa_sm_step(sm);
  }
  
  
  static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
  {
  	if (sm->pmksa == ctx)
  		sm->pmksa = NULL;
  	return 0;
  }
  
  
  static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
  				   void *ctx)
  {
  	struct wpa_authenticator *wpa_auth = ctx;
  	wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
  }
  
  
  static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
  					  struct wpa_group *group)
  {
  	u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)];
  	u8 rkey[32];
  	unsigned long ptr;
  
  	if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
  		return -1;
  	wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
  
  	/*
  	 * Counter = PRF-256(Random number, "Init Counter",
  	 *                   Local MAC Address || Time)
  	 */
  	os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
  	wpa_get_ntp_timestamp(buf + ETH_ALEN);
  	ptr = (unsigned long) group;
  	os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr));
  	if (random_get_bytes(rkey, sizeof(rkey)) < 0)
  		return -1;
  
  	if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
  		     group->Counter, WPA_NONCE_LEN) < 0)
  		return -1;
  	wpa_hexdump_key(MSG_DEBUG, "Key Counter",
  			group->Counter, WPA_NONCE_LEN);
  
  	return 0;
  }
  
  
  static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
  					 int vlan_id, int delay_init)
  {
  	struct wpa_group *group;
  
  	group = os_zalloc(sizeof(struct wpa_group));
  	if (group == NULL)
  		return NULL;
  
  	group->GTKAuthenticator = TRUE;
  	group->vlan_id = vlan_id;
  	group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
  
  	if (random_pool_ready() != 1) {
  		wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
  			   "for secure operations - update keys later when "
  			   "the first station connects");
  	}
  
  	/*
  	 * Set initial GMK/Counter value here. The actual values that will be
  	 * used in negotiations will be set once the first station tries to
  	 * connect. This allows more time for collecting additional randomness
  	 * on embedded devices.
  	 */
  	if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
  		wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
  			   "initialization.");
  		os_free(group);
  		return NULL;
  	}
  
  	group->GInit = TRUE;
  	if (delay_init) {
  		wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
  			   "until Beacon frames have been configured");
  		/* Initialization is completed in wpa_init_keys(). */
  	} else {
  		wpa_group_sm_step(wpa_auth, group);
  		group->GInit = FALSE;
  		wpa_group_sm_step(wpa_auth, group);
  	}
  
  	return group;
  }
  
  
  /**
   * wpa_init - Initialize WPA authenticator
   * @addr: Authenticator address
   * @conf: Configuration for WPA authenticator
   * @cb: Callback functions for WPA authenticator
   * Returns: Pointer to WPA authenticator data or %NULL on failure
   */
  struct wpa_authenticator * wpa_init(const u8 *addr,
  				    struct wpa_auth_config *conf,
  				    struct wpa_auth_callbacks *cb)
  {
  	struct wpa_authenticator *wpa_auth;
  
  	wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
  	if (wpa_auth == NULL)
  		return NULL;
  	os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
  	os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
  	os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
  
  	if (wpa_auth_gen_wpa_ie(wpa_auth)) {
  		wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
  		os_free(wpa_auth);
  		return NULL;
  	}
  
  	wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
  	if (wpa_auth->group == NULL) {
  		os_free(wpa_auth->wpa_ie);
  		os_free(wpa_auth);
  		return NULL;
  	}
  
  	wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
  						wpa_auth);
  	if (wpa_auth->pmksa == NULL) {
  		wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
  		os_free(wpa_auth->group);
  		os_free(wpa_auth->wpa_ie);
  		os_free(wpa_auth);
  		return NULL;
  	}
  
  #ifdef CONFIG_IEEE80211R
  	wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
  	if (wpa_auth->ft_pmk_cache == NULL) {
  		wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
  		os_free(wpa_auth->group);
  		os_free(wpa_auth->wpa_ie);
  		pmksa_cache_auth_deinit(wpa_auth->pmksa);
  		os_free(wpa_auth);
  		return NULL;
  	}
  #endif /* CONFIG_IEEE80211R */
  
  	if (wpa_auth->conf.wpa_gmk_rekey) {
  		eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
  				       wpa_rekey_gmk, wpa_auth, NULL);
  	}
  
  	if (wpa_auth->conf.wpa_group_rekey) {
  		eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
  				       wpa_rekey_gtk, wpa_auth, NULL);
  	}
  
  #ifdef CONFIG_P2P
  	if (WPA_GET_BE32(conf->ip_addr_start)) {
  		int count = WPA_GET_BE32(conf->ip_addr_end) -
  			WPA_GET_BE32(conf->ip_addr_start) + 1;
  		if (count > 1000)
  			count = 1000;
  		if (count > 0)
  			wpa_auth->ip_pool = bitfield_alloc(count);
  	}
  #endif /* CONFIG_P2P */
  
  	return wpa_auth;
  }
  
  
  int wpa_init_keys(struct wpa_authenticator *wpa_auth)
  {
  	struct wpa_group *group = wpa_auth->group;
  
  	wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
  		   "keys");
  	wpa_group_sm_step(wpa_auth, group);
  	group->GInit = FALSE;
  	wpa_group_sm_step(wpa_auth, group);
  	if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
  		return -1;
  	return 0;
  }
  
  
  /**
   * wpa_deinit - Deinitialize WPA authenticator
   * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
   */
  void wpa_deinit(struct wpa_authenticator *wpa_auth)
  {
  	struct wpa_group *group, *prev;
  
  	eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
  	eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
  
  #ifdef CONFIG_PEERKEY
  	while (wpa_auth->stsl_negotiations)
  		wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
  #endif /* CONFIG_PEERKEY */
  
  	pmksa_cache_auth_deinit(wpa_auth->pmksa);
  
  #ifdef CONFIG_IEEE80211R
  	wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
  	wpa_auth->ft_pmk_cache = NULL;
  #endif /* CONFIG_IEEE80211R */
  
  #ifdef CONFIG_P2P
  	bitfield_free(wpa_auth->ip_pool);
  #endif /* CONFIG_P2P */
  
  
  	os_free(wpa_auth->wpa_ie);
  
  	group = wpa_auth->group;
  	while (group) {
  		prev = group;
  		group = group->next;
  		os_free(prev);
  	}
  
  	os_free(wpa_auth);
  }
  
  
  /**
   * wpa_reconfig - Update WPA authenticator configuration
   * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
   * @conf: Configuration for WPA authenticator
   */
  int wpa_reconfig(struct wpa_authenticator *wpa_auth,
  		 struct wpa_auth_config *conf)
  {
  	struct wpa_group *group;
  	if (wpa_auth == NULL)
  		return 0;
  
  	os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
  	if (wpa_auth_gen_wpa_ie(wpa_auth)) {
  		wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
  		return -1;
  	}
  
  	/*
  	 * Reinitialize GTK to make sure it is suitable for the new
  	 * configuration.
  	 */
  	group = wpa_auth->group;
  	group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
  	group->GInit = TRUE;
  	wpa_group_sm_step(wpa_auth, group);
  	group->GInit = FALSE;
  	wpa_group_sm_step(wpa_auth, group);
  
  	return 0;
  }
  
  
  struct wpa_state_machine *
  wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr,
  		  const u8 *p2p_dev_addr)
  {
  	struct wpa_state_machine *sm;
  
  	if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
  		return NULL;
  
  	sm = os_zalloc(sizeof(struct wpa_state_machine));
  	if (sm == NULL)
  		return NULL;
  	os_memcpy(sm->addr, addr, ETH_ALEN);
  	if (p2p_dev_addr)
  		os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN);
  
  	sm->wpa_auth = wpa_auth;
  	sm->group = wpa_auth->group;
  	wpa_group_get(sm->wpa_auth, sm->group);
  
  	return sm;
  }
  
  
  int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
  			    struct wpa_state_machine *sm)
  {
  	if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
  		return -1;
  
  #ifdef CONFIG_IEEE80211R
  	if (sm->ft_completed) {
  		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
  				"FT authentication already completed - do not "
  				"start 4-way handshake");
  		/* Go to PTKINITDONE state to allow GTK rekeying */
  		sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
  		return 0;
  	}
  #endif /* CONFIG_IEEE80211R */
  
  	if (sm->started) {
  		os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
  		sm->ReAuthenticationRequest = TRUE;
  		return wpa_sm_step(sm);
  	}
  
  	wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
  			"start authentication");
  	sm->started = 1;
  
  	sm->Init = TRUE;
  	if (wpa_sm_step(sm) == 1)
  		return 1; /* should not really happen */
  	sm->Init = FALSE;
  	sm->AuthenticationRequest = TRUE;
  	return wpa_sm_step(sm);
  }
  
  
  void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
  {
  	/* WPA/RSN was not used - clear WPA state. This is needed if the STA
  	 * reassociates back to the same AP while the previous entry for the
  	 * STA has not yet been removed. */
  	if (sm == NULL)
  		return;
  
  	sm->wpa_key_mgmt = 0;
  }
  
  
  static void wpa_free_sta_sm(struct wpa_state_machine *sm)
  {
  #ifdef CONFIG_P2P
  	if (WPA_GET_BE32(sm->ip_addr)) {
  		u32 start;
  		wpa_printf(MSG_DEBUG, "P2P: Free assigned IP "
  			   "address %u.%u.%u.%u from " MACSTR,
  			   sm->ip_addr[0], sm->ip_addr[1],
  			   sm->ip_addr[2], sm->ip_addr[3],
  			   MAC2STR(sm->addr));
  		start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start);
  		bitfield_clear(sm->wpa_auth->ip_pool,
  			       WPA_GET_BE32(sm->ip_addr) - start);
  	}
  #endif /* CONFIG_P2P */
  	if (sm->GUpdateStationKeys) {
  		sm->group->GKeyDoneStations--;
  		sm->GUpdateStationKeys = FALSE;
  	}
  #ifdef CONFIG_IEEE80211R
  	os_free(sm->assoc_resp_ftie);
  	wpabuf_free(sm->ft_pending_req_ies);
  #endif /* CONFIG_IEEE80211R */
  	os_free(sm->last_rx_eapol_key);
  	os_free(sm->wpa_ie);
  	wpa_group_put(sm->wpa_auth, sm->group);
  	os_free(sm);
  }
  
  
  void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
  {
  	if (sm == NULL)
  		return;
  
  	if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
  		wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
  				"strict rekeying - force GTK rekey since STA "
  				"is leaving");
  		eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
  		eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
  				       NULL);
  	}
  
  	eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
  	sm->pending_1_of_4_timeout = 0;
  	eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
  	eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
  	if (sm->in_step_loop) {
  		/* Must not free state machine while wpa_sm_step() is running.
  		 * Freeing will be completed in the end of wpa_sm_step(). */
  		wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
  			   "machine deinit for " MACSTR, MAC2STR(sm->addr));
  		sm->pending_deinit = 1;
  	} else
  		wpa_free_sta_sm(sm);
  }
  
  
  static void wpa_request_new_ptk(struct wpa_state_machine *sm)
  {
  	if (sm == NULL)
  		return;
  
  	sm->PTKRequest = TRUE;
  	sm->PTK_valid = 0;
  }
  
  
  static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
  				    const u8 *replay_counter)
  {
  	int i;
  	for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
  		if (!ctr[i].valid)
  			break;
  		if (os_memcmp(replay_counter, ctr[i].counter,
  			      WPA_REPLAY_COUNTER_LEN) == 0)
  			return 1;
  	}
  	return 0;
  }
  
  
  static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
  					    const u8 *replay_counter)
  {
  	int i;
  	for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
  		if (ctr[i].valid &&
  		    (replay_counter == NULL ||
  		     os_memcmp(replay_counter, ctr[i].counter,
  			       WPA_REPLAY_COUNTER_LEN) == 0))
  			ctr[i].valid = FALSE;
  	}
  }
  
  
  #ifdef CONFIG_IEEE80211R
  static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
  			       struct wpa_state_machine *sm,
  			       struct wpa_eapol_ie_parse *kde)
  {
  	struct wpa_ie_data ie;
  	struct rsn_mdie *mdie;
  
  	if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
  	    ie.num_pmkid != 1 || ie.pmkid == NULL) {
  		wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
  			   "FT 4-way handshake message 2/4");
  		return -1;
  	}
  
  	os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
  	wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
  		    sm->sup_pmk_r1_name, PMKID_LEN);
  
  	if (!kde->mdie || !kde->ftie) {
  		wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
  			   "message 2/4", kde->mdie ? "FTIE" : "MDIE");
  		return -1;
  	}
  
  	mdie = (struct rsn_mdie *) (kde->mdie + 2);
  	if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
  	    os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
  		      MOBILITY_DOMAIN_ID_LEN) != 0) {
  		wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
  		return -1;
  	}
  
  	if (sm->assoc_resp_ftie &&
  	    (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
  	     os_memcmp(kde->ftie, sm->assoc_resp_ftie,
  		       2 + sm->assoc_resp_ftie[1]) != 0)) {
  		wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
  		wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
  			    kde->ftie, kde->ftie_len);
  		wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
  			    sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
  		return -1;
  	}
  
  	return 0;
  }
  #endif /* CONFIG_IEEE80211R */
  
  
  static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
  				    struct wpa_state_machine *sm, int group)
  {
  	/* Supplicant reported a Michael MIC error */
  	wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
  			 "received EAPOL-Key Error Request "
  			 "(STA detected Michael MIC failure (group=%d))",
  			 group);
  
  	if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
  		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
  				"ignore Michael MIC failure report since "
  				"group cipher is not TKIP");
  	} else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
  		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
  				"ignore Michael MIC failure report since "
  				"pairwise cipher is not TKIP");
  	} else {
  		if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
  			return 1; /* STA entry was removed */
  		sm->dot11RSNAStatsTKIPRemoteMICFailures++;
  		wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
  	}
  
  	/*
  	 * Error report is not a request for a new key handshake, but since
  	 * Authenticator may do it, let's change the keys now anyway.
  	 */
  	wpa_request_new_ptk(sm);
  	return 0;
  }
  
  
  static int wpa_try_alt_snonce(struct wpa_state_machine *sm, u8 *data,
  			      size_t data_len)
  {
  	struct wpa_ptk PTK;
  	int ok = 0;
  	const u8 *pmk = NULL;
  	unsigned int pmk_len;
  
  	for (;;) {
  		if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
  			pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
  					       sm->p2p_dev_addr, pmk);
  			if (pmk == NULL)
  				break;
  			pmk_len = PMK_LEN;
  		} else {
  			pmk = sm->PMK;
  			pmk_len = sm->pmk_len;
  		}
  
  		wpa_derive_ptk(sm, sm->alt_SNonce, pmk, pmk_len, &PTK);
  
  		if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK, data, data_len)
  		    == 0) {
  			ok = 1;
  			break;
  		}
  
  		if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
  			break;
  	}
  
  	if (!ok) {
  		wpa_printf(MSG_DEBUG,
  			   "WPA: Earlier SNonce did not result in matching MIC");
  		return -1;
  	}
  
  	wpa_printf(MSG_DEBUG,
  		   "WPA: Earlier SNonce resulted in matching MIC");
  	sm->alt_snonce_valid = 0;
  	os_memcpy(sm->SNonce, sm->alt_SNonce, WPA_NONCE_LEN);
  	os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
  	sm->PTK_valid = TRUE;
  
  	return 0;
  }
  
  
  void wpa_receive(struct wpa_authenticator *wpa_auth,
  		 struct wpa_state_machine *sm,
  		 u8 *data, size_t data_len)
  {
  	struct ieee802_1x_hdr *hdr;
  	struct wpa_eapol_key *key;
  	struct wpa_eapol_key_192 *key192;
  	u16 key_info, key_data_length;
  	enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
  	       SMK_M1, SMK_M3, SMK_ERROR } msg;
  	char *msgtxt;
  	struct wpa_eapol_ie_parse kde;
  	int ft;
  	const u8 *eapol_key_ie, *key_data;
  	size_t eapol_key_ie_len, keyhdrlen, mic_len;
  
  	if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
  		return;
  
  	mic_len = wpa_mic_len(sm->wpa_key_mgmt);
  	keyhdrlen = mic_len == 24 ? sizeof(*key192) : sizeof(*key);
  
  	if (data_len < sizeof(*hdr) + keyhdrlen)
  		return;
  
  	hdr = (struct ieee802_1x_hdr *) data;
  	key = (struct wpa_eapol_key *) (hdr + 1);
  	key192 = (struct wpa_eapol_key_192 *) (hdr + 1);
  	key_info = WPA_GET_BE16(key->key_info);
  	if (mic_len == 24) {
  		key_data = (const u8 *) (key192 + 1);
  		key_data_length = WPA_GET_BE16(key192->key_data_length);
  	} else {
  		key_data = (const u8 *) (key + 1);
  		key_data_length = WPA_GET_BE16(key->key_data_length);
  	}
  	wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
  		   " key_info=0x%x type=%u key_data_length=%u",
  		   MAC2STR(sm->addr), key_info, key->type, key_data_length);
  	if (key_data_length > data_len - sizeof(*hdr) - keyhdrlen) {
  		wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
  			   "key_data overflow (%d > %lu)",
  			   key_data_length,
  			   (unsigned long) (data_len - sizeof(*hdr) -
  					    keyhdrlen));
  		return;
  	}
  
  	if (sm->wpa == WPA_VERSION_WPA2) {
  		if (key->type == EAPOL_KEY_TYPE_WPA) {
  			/*
  			 * Some deployed station implementations seem to send
  			 * msg 4/4 with incorrect type value in WPA2 mode.
  			 */
  			wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
  				   "with unexpected WPA type in RSN mode");
  		} else if (key->type != EAPOL_KEY_TYPE_RSN) {
  			wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
  				   "unexpected type %d in RSN mode",
  				   key->type);
  			return;
  		}
  	} else {
  		if (key->type != EAPOL_KEY_TYPE_WPA) {
  			wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
  				   "unexpected type %d in WPA mode",
  				   key->type);
  			return;
  		}
  	}
  
  	wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
  		    WPA_NONCE_LEN);
  	wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
  		    key->replay_counter, WPA_REPLAY_COUNTER_LEN);
  
  	/* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
  	 * are set */
  
  	if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
  	    (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
  		if (key_info & WPA_KEY_INFO_ERROR) {
  			msg = SMK_ERROR;
  			msgtxt = "SMK Error";
  		} else {
  			msg = SMK_M1;
  			msgtxt = "SMK M1";
  		}
  	} else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
  		msg = SMK_M3;
  		msgtxt = "SMK M3";
  	} else if (key_info & WPA_KEY_INFO_REQUEST) {
  		msg = REQUEST;
  		msgtxt = "Request";
  	} else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
  		msg = GROUP_2;
  		msgtxt = "2/2 Group";
  	} else if (key_data_length == 0) {
  		msg = PAIRWISE_4;
  		msgtxt = "4/4 Pairwise";
  	} else {
  		msg = PAIRWISE_2;
  		msgtxt = "2/4 Pairwise";
  	}
  
  	/* TODO: key_info type validation for PeerKey */
  	if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
  	    msg == GROUP_2) {
  		u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
  		if (sm->pairwise == WPA_CIPHER_CCMP ||
  		    sm->pairwise == WPA_CIPHER_GCMP) {
  			if (wpa_use_aes_cmac(sm) &&
  			    sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN &&
  			    !wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) &&
  			    ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
  				wpa_auth_logger(wpa_auth, sm->addr,
  						LOGGER_WARNING,
  						"advertised support for "
  						"AES-128-CMAC, but did not "
  						"use it");
  				return;
  			}
  
  			if (!wpa_use_aes_cmac(sm) &&
  			    ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
  				wpa_auth_logger(wpa_auth, sm->addr,
  						LOGGER_WARNING,
  						"did not use HMAC-SHA1-AES "
  						"with CCMP/GCMP");
  				return;
  			}
  		}
  
  		if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) &&
  		    ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
  			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
  					"did not use EAPOL-Key descriptor version 0 as required for AKM-defined cases");
  			return;
  		}
  	}
  
  	if (key_info & WPA_KEY_INFO_REQUEST) {
  		if (sm->req_replay_counter_used &&
  		    os_memcmp(key->replay_counter, sm->req_replay_counter,
  			      WPA_REPLAY_COUNTER_LEN) <= 0) {
  			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
  					"received EAPOL-Key request with "
  					"replayed counter");
  			return;
  		}
  	}
  
  	if (!(key_info & WPA_KEY_INFO_REQUEST) &&
  	    !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
  		int i;
  
  		if (msg == PAIRWISE_2 &&
  		    wpa_replay_counter_valid(sm->prev_key_replay,
  					     key->replay_counter) &&
  		    sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
  		    os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
  		{
  			/*
  			 * Some supplicant implementations (e.g., Windows XP
  			 * WZC) update SNonce for each EAPOL-Key 2/4. This
  			 * breaks the workaround on accepting any of the
  			 * pending requests, so allow the SNonce to be updated
  			 * even if we have already sent out EAPOL-Key 3/4.
  			 */
  			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
  					 "Process SNonce update from STA "
  					 "based on retransmitted EAPOL-Key "
  					 "1/4");
  			sm->update_snonce = 1;
  			os_memcpy(sm->alt_SNonce, sm->SNonce, WPA_NONCE_LEN);
  			sm->alt_snonce_valid = TRUE;
  			os_memcpy(sm->alt_replay_counter,
  				  sm->key_replay[0].counter,
  				  WPA_REPLAY_COUNTER_LEN);
  			goto continue_processing;
  		}
  
  		if (msg == PAIRWISE_4 && sm->alt_snonce_valid &&
  		    sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
  		    os_memcmp(key->replay_counter, sm->alt_replay_counter,
  			      WPA_REPLAY_COUNTER_LEN) == 0) {
  			/*
  			 * Supplicant may still be using the old SNonce since
  			 * there was two EAPOL-Key 2/4 messages and they had
  			 * different SNonce values.
  			 */
  			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
  					 "Try to process received EAPOL-Key 4/4 based on old Replay Counter and SNonce from an earlier EAPOL-Key 1/4");
  			goto continue_processing;
  		}
  
  		if (msg == PAIRWISE_2 &&
  		    wpa_replay_counter_valid(sm->prev_key_replay,
  					     key->replay_counter) &&
  		    sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
  			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
  					 "ignore retransmitted EAPOL-Key %s - "
  					 "SNonce did not change", msgtxt);
  		} else {
  			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
  					 "received EAPOL-Key %s with "
  					 "unexpected replay counter", msgtxt);
  		}
  		for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
  			if (!sm->key_replay[i].valid)
  				break;
  			wpa_hexdump(MSG_DEBUG, "pending replay counter",
  				    sm->key_replay[i].counter,
  				    WPA_REPLAY_COUNTER_LEN);
  		}
  		wpa_hexdump(MSG_DEBUG, "received replay counter",
  			    key->replay_counter, WPA_REPLAY_COUNTER_LEN);
  		return;
  	}
  
  continue_processing:
  	switch (msg) {
  	case PAIRWISE_2:
  		if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
  		    sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
  		    (!sm->update_snonce ||
  		     sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
  			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
  					 "received EAPOL-Key msg 2/4 in "
  					 "invalid state (%d) - dropped",
  					 sm->wpa_ptk_state);
  			return;
  		}
  		random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
  		if (sm->group->reject_4way_hs_for_entropy) {
  			/*
  			 * The system did not have enough entropy to generate
  			 * strong random numbers. Reject the first 4-way
  			 * handshake(s) and collect some entropy based on the
  			 * information from it. Once enough entropy is
  			 * available, the next atempt will trigger GMK/Key
  			 * Counter update and the station will be allowed to
  			 * continue.
  			 */
  			wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
  				   "collect more entropy for random number "
  				   "generation");
  			random_mark_pool_ready();
  			wpa_sta_disconnect(wpa_auth, sm->addr);
  			return;
  		}
  		if (wpa_parse_kde_ies(key_data, key_data_length, &kde) < 0) {
  			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
  					 "received EAPOL-Key msg 2/4 with "
  					 "invalid Key Data contents");
  			return;
  		}
  		if (kde.rsn_ie) {
  			eapol_key_ie = kde.rsn_ie;
  			eapol_key_ie_len = kde.rsn_ie_len;
  		} else if (kde.osen) {
  			eapol_key_ie = kde.osen;
  			eapol_key_ie_len = kde.osen_len;
  		} else {
  			eapol_key_ie = kde.wpa_ie;
  			eapol_key_ie_len = kde.wpa_ie_len;
  		}
  		ft = sm->wpa == WPA_VERSION_WPA2 &&
  			wpa_key_mgmt_ft(sm->wpa_key_mgmt);
  		if (sm->wpa_ie == NULL ||
  		    wpa_compare_rsn_ie(ft,
  				       sm->wpa_ie, sm->wpa_ie_len,
  				       eapol_key_ie, eapol_key_ie_len)) {
  			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
  					"WPA IE from (Re)AssocReq did not "
  					"match with msg 2/4");
  			if (sm->wpa_ie) {
  				wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
  					    sm->wpa_ie, sm->wpa_ie_len);
  			}
  			wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
  				    eapol_key_ie, eapol_key_ie_len);
  			/* MLME-DEAUTHENTICATE.request */
  			wpa_sta_disconnect(wpa_auth, sm->addr);
  			return;
  		}
  #ifdef CONFIG_IEEE80211R
  		if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
  			wpa_sta_disconnect(wpa_auth, sm->addr);
  			return;
  		}
  #endif /* CONFIG_IEEE80211R */
  #ifdef CONFIG_P2P
  		if (kde.ip_addr_req && kde.ip_addr_req[0] &&
  		    wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) {
  			int idx;
  			wpa_printf(MSG_DEBUG, "P2P: IP address requested in "
  				   "EAPOL-Key exchange");
  			idx = bitfield_get_first_zero(wpa_auth->ip_pool);
  			if (idx >= 0) {
  				u32 start = WPA_GET_BE32(wpa_auth->conf.
  							 ip_addr_start);
  				bitfield_set(wpa_auth->ip_pool, idx);
  				WPA_PUT_BE32(sm->ip_addr, start + idx);
  				wpa_printf(MSG_DEBUG, "P2P: Assigned IP "
  					   "address %u.%u.%u.%u to " MACSTR,
  					   sm->ip_addr[0], sm->ip_addr[1],
  					   sm->ip_addr[2], sm->ip_addr[3],
  					   MAC2STR(sm->addr));
  			}
  		}
  #endif /* CONFIG_P2P */
  		break;
  	case PAIRWISE_4:
  		if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
  		    !sm->PTK_valid) {
  			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
  					 "received EAPOL-Key msg 4/4 in "
  					 "invalid state (%d) - dropped",
  					 sm->wpa_ptk_state);
  			return;
  		}
  		break;
  	case GROUP_2:
  		if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
  		    || !sm->PTK_valid) {
  			wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
  					 "received EAPOL-Key msg 2/2 in "
  					 "invalid state (%d) - dropped",
  					 sm->wpa_ptk_group_state);
  			return;
  		}
  		break;
  #ifdef CONFIG_PEERKEY
  	case SMK_M1:
  	case SMK_M3:
  	case SMK_ERROR:
  		if (!wpa_auth->conf.peerkey) {
  			wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
  				   "PeerKey use disabled - ignoring message");
  			return;
  		}
  		if (!sm->PTK_valid) {
  			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
  					"received EAPOL-Key msg SMK in "
  					"invalid state - dropped");
  			return;
  		}
  		break;
  #else /* CONFIG_PEERKEY */
  	case SMK_M1:
  	case SMK_M3:
  	case SMK_ERROR:
  		return; /* STSL disabled - ignore SMK messages */
  #endif /* CONFIG_PEERKEY */
  	case REQUEST:
  		break;
  	}
  
  	wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
  			 "received EAPOL-Key frame (%s)", msgtxt);
  
  	if (key_info & WPA_KEY_INFO_ACK) {
  		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
  				"received invalid EAPOL-Key: Key Ack set");
  		return;
  	}
  
  	if (!(key_info & WPA_KEY_INFO_MIC)) {
  		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
  				"received invalid EAPOL-Key: Key MIC not set");
  		return;
  	}
  
  	sm->MICVerified = FALSE;
  	if (sm->PTK_valid && !sm->update_snonce) {
  		if (wpa_verify_key_mic(sm->wpa_key_mgmt, &sm->PTK, data,
  				       data_len) &&
  		    (msg != PAIRWISE_4 || !sm->alt_snonce_valid ||
  		     wpa_try_alt_snonce(sm, data, data_len))) {
  			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
  					"received EAPOL-Key with invalid MIC");
  			return;
  		}
  		sm->MICVerified = TRUE;
  		eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
  		sm->pending_1_of_4_timeout = 0;
  	}
  
  	if (key_info & WPA_KEY_INFO_REQUEST) {
  		if (sm->MICVerified) {
  			sm->req_replay_counter_used = 1;
  			os_memcpy(sm->req_replay_counter, key->replay_counter,
  				  WPA_REPLAY_COUNTER_LEN);
  		} else {
  			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
  					"received EAPOL-Key request with "
  					"invalid MIC");
  			return;
  		}
  
  		/*
  		 * TODO: should decrypt key data field if encryption was used;
  		 * even though MAC address KDE is not normally encrypted,
  		 * supplicant is allowed to encrypt it.
  		 */
  		if (msg == SMK_ERROR) {
  #ifdef CONFIG_PEERKEY
  			wpa_smk_error(wpa_auth, sm, key_data, key_data_length);
  #endif /* CONFIG_PEERKEY */
  			return;
  		} else if (key_info & WPA_KEY_INFO_ERROR) {
  			if (wpa_receive_error_report(
  				    wpa_auth, sm,
  				    !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
  				return; /* STA entry was removed */
  		} else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
  			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
  					"received EAPOL-Key Request for new "
  					"4-Way Handshake");
  			wpa_request_new_ptk(sm);
  #ifdef CONFIG_PEERKEY
  		} else if (msg == SMK_M1) {
  			wpa_smk_m1(wpa_auth, sm, key, key_data,
  				   key_data_length);
  #endif /* CONFIG_PEERKEY */
  		} else if (key_data_length > 0 &&
  			   wpa_parse_kde_ies(key_data, key_data_length,
  					     &kde) == 0 &&
  			   kde.mac_addr) {
  		} else {
  			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
  					"received EAPOL-Key Request for GTK "
  					"rekeying");
  			eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
  			wpa_rekey_gtk(wpa_auth, NULL);
  		}
  	} else {
  		/* Do not allow the same key replay counter to be reused. */
  		wpa_replay_counter_mark_invalid(sm->key_replay,
  						key->replay_counter);
  
  		if (msg == PAIRWISE_2) {
  			/*
  			 * Maintain a copy of the pending EAPOL-Key frames in
  			 * case the EAPOL-Key frame was retransmitted. This is
  			 * needed to allow EAPOL-Key msg 2/4 reply to another
  			 * pending msg 1/4 to update the SNonce to work around
  			 * unexpected supplicant behavior.
  			 */
  			os_memcpy(sm->prev_key_replay, sm->key_replay,
  				  sizeof(sm->key_replay));
  		} else {
  			os_memset(sm->prev_key_replay, 0,
  				  sizeof(sm->prev_key_replay));
  		}
  
  		/*
  		 * Make sure old valid counters are not accepted anymore and
  		 * do not get copied again.
  		 */
  		wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
  	}
  
  #ifdef CONFIG_PEERKEY
  	if (msg == SMK_M3) {
  		wpa_smk_m3(wpa_auth, sm, key, key_data, key_data_length);
  		return;
  	}
  #endif /* CONFIG_PEERKEY */
  
  	os_free(sm->last_rx_eapol_key);
  	sm->last_rx_eapol_key = os_malloc(data_len);
  	if (sm->last_rx_eapol_key == NULL)
  		return;
  	os_memcpy(sm->last_rx_eapol_key, data, data_len);
  	sm->last_rx_eapol_key_len = data_len;
  
  	sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
  	sm->EAPOLKeyReceived = TRUE;
  	sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
  	sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
  	os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
  	wpa_sm_step(sm);
  }
  
  
  static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
  			  const u8 *gnonce, u8 *gtk, size_t gtk_len)
  {
  	u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
  	u8 *pos;
  	int ret = 0;
  
  	/* GTK = PRF-X(GMK, "Group key expansion",
  	 *	AA || GNonce || Time || random data)
  	 * The example described in the IEEE 802.11 standard uses only AA and
  	 * GNonce as inputs here. Add some more entropy since this derivation
  	 * is done only at the Authenticator and as such, does not need to be
  	 * exactly same.
  	 */
  	os_memcpy(data, addr, ETH_ALEN);
  	os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
  	pos = data + ETH_ALEN + WPA_NONCE_LEN;
  	wpa_get_ntp_timestamp(pos);
  	pos += 8;
  	if (random_get_bytes(pos, 16) < 0)
  		ret = -1;
  
  #ifdef CONFIG_IEEE80211W
  	sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
  #else /* CONFIG_IEEE80211W */
  	if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
  	    < 0)
  		ret = -1;
  #endif /* CONFIG_IEEE80211W */
  
  	return ret;
  }
  
  
  static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
  {
  	struct wpa_authenticator *wpa_auth = eloop_ctx;
  	struct wpa_state_machine *sm = timeout_ctx;
  
  	sm->pending_1_of_4_timeout = 0;
  	wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
  	sm->TimeoutEvt = TRUE;
  	wpa_sm_step(sm);
  }
  
  
  void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
  		      struct wpa_state_machine *sm, int key_info,
  		      const u8 *key_rsc, const u8 *nonce,
  		      const u8 *kde, size_t kde_len,
  		      int keyidx, int encr, int force_version)
  {
  	struct ieee802_1x_hdr *hdr;
  	struct wpa_eapol_key *key;
  	struct wpa_eapol_key_192 *key192;
  	size_t len, mic_len, keyhdrlen;
  	int alg;
  	int key_data_len, pad_len = 0;
  	u8 *buf, *pos;
  	int version, pairwise;
  	int i;
  	u8 *key_data;
  
  	mic_len = wpa_mic_len(sm->wpa_key_mgmt);
  	keyhdrlen = mic_len == 24 ? sizeof(*key192) : sizeof(*key);
  
  	len = sizeof(struct ieee802_1x_hdr) + keyhdrlen;
  
  	if (force_version)
  		version = force_version;
  	else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
  		 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt))
  		version = WPA_KEY_INFO_TYPE_AKM_DEFINED;
  	else if (wpa_use_aes_cmac(sm))
  		version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
  	else if (sm->pairwise != WPA_CIPHER_TKIP)
  		version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
  	else
  		version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
  
  	pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
  
  	wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
  		   "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
  		   "encr=%d)",
  		   version,
  		   (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
  		   (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
  		   (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
  		   (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
  		   pairwise, (unsigned long) kde_len, keyidx, encr);
  
  	key_data_len = kde_len;
  
  	if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
  	     sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
  	     wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
  	     version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
  		pad_len = key_data_len % 8;
  		if (pad_len)
  			pad_len = 8 - pad_len;
  		key_data_len += pad_len + 8;
  	}
  
  	len += key_data_len;
  
  	hdr = os_zalloc(len);
  	if (hdr == NULL)
  		return;
  	hdr->version = wpa_auth->conf.eapol_version;
  	hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
  	hdr->length = host_to_be16(len  - sizeof(*hdr));
  	key = (struct wpa_eapol_key *) (hdr + 1);
  	key192 = (struct wpa_eapol_key_192 *) (hdr + 1);
  	key_data = ((u8 *) (hdr + 1)) + keyhdrlen;
  
  	key->type = sm->wpa == WPA_VERSION_WPA2 ?
  		EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
  	key_info |= version;
  	if (encr && sm->wpa == WPA_VERSION_WPA2)
  		key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
  	if (sm->wpa != WPA_VERSION_WPA2)
  		key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
  	WPA_PUT_BE16(key->key_info, key_info);
  
  	alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
  	WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
  	if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
  		WPA_PUT_BE16(key->key_length, 0);
  
  	/* FIX: STSL: what to use as key_replay_counter? */
  	for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
  		sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
  		os_memcpy(sm->key_replay[i].counter,
  			  sm->key_replay[i - 1].counter,
  			  WPA_REPLAY_COUNTER_LEN);
  	}
  	inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
  	os_memcpy(key->replay_counter, sm->key_replay[0].counter,
  		  WPA_REPLAY_COUNTER_LEN);
  	wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter",
  		    key->replay_counter, WPA_REPLAY_COUNTER_LEN);
  	sm->key_replay[0].valid = TRUE;
  
  	if (nonce)
  		os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
  
  	if (key_rsc)
  		os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
  
  	if (kde && !encr) {
  		os_memcpy(key_data, kde, kde_len);
  		if (mic_len == 24)
  			WPA_PUT_BE16(key192->key_data_length, kde_len);
  		else
  			WPA_PUT_BE16(key->key_data_length, kde_len);
  	} else if (encr && kde) {
  		buf = os_zalloc(key_data_len);
  		if (buf == NULL) {
  			os_free(hdr);
  			return;
  		}
  		pos = buf;
  		os_memcpy(pos, kde, kde_len);
  		pos += kde_len;
  
  		if (pad_len)
  			*pos++ = 0xdd;
  
  		wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
  				buf, key_data_len);
  		if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
  		    sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
  		    wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
  		    version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
  			if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len,
  				     (key_data_len - 8) / 8, buf, key_data)) {
  				os_free(hdr);
  				os_free(buf);
  				return;
  			}
  			if (mic_len == 24)
  				WPA_PUT_BE16(key192->key_data_length,
  					     key_data_len);
  			else
  				WPA_PUT_BE16(key->key_data_length,
  					     key_data_len);
  #ifndef CONFIG_NO_RC4
  		} else if (sm->PTK.kek_len == 16) {
  			u8 ek[32];
  			os_memcpy(key->key_iv,
  				  sm->group->Counter + WPA_NONCE_LEN - 16, 16);
  			inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
  			os_memcpy(ek, key->key_iv, 16);
  			os_memcpy(ek + 16, sm->PTK.kek, sm->PTK.kek_len);
  			os_memcpy(key_data, buf, key_data_len);
  			rc4_skip(ek, 32, 256, key_data, key_data_len);
  			if (mic_len == 24)
  				WPA_PUT_BE16(key192->key_data_length,
  					     key_data_len);
  			else
  				WPA_PUT_BE16(key->key_data_length,
  					     key_data_len);
  #endif /* CONFIG_NO_RC4 */
  		} else {
  			os_free(hdr);
  			os_free(buf);
  			return;
  		}
  		os_free(buf);
  	}
  
  	if (key_info & WPA_KEY_INFO_MIC) {
  		u8 *key_mic;
  
  		if (!sm->PTK_valid) {
  			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
  					"PTK not valid when sending EAPOL-Key "
  					"frame");
  			os_free(hdr);
  			return;
  		}
  
  		key_mic = key192->key_mic; /* same offset for key and key192 */
  		wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len,
  				  sm->wpa_key_mgmt, version,
  				  (u8 *) hdr, len, key_mic);
  #ifdef CONFIG_TESTING_OPTIONS
  		if (!pairwise &&
  		    wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&
  		    drand48() <
  		    wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
  			wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
  					"Corrupting group EAPOL-Key Key MIC");
  			key_mic[0]++;
  		}
  #endif /* CONFIG_TESTING_OPTIONS */
  	}
  
  	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
  			   1);
  	wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
  			    sm->pairwise_set);
  	os_free(hdr);
  }
  
  
  static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
  			   struct wpa_state_machine *sm, int key_info,
  			   const u8 *key_rsc, const u8 *nonce,
  			   const u8 *kde, size_t kde_len,
  			   int keyidx, int encr)
  {
  	int timeout_ms;
  	int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
  	int ctr;
  
  	if (sm == NULL)
  		return;
  
  	__wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
  			 keyidx, encr, 0);
  
  	ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
  	if (ctr == 1 && wpa_auth->conf.tx_status)
  		timeout_ms = pairwise ? eapol_key_timeout_first :
  			eapol_key_timeout_first_group;
  	else
  		timeout_ms = eapol_key_timeout_subseq;
  	if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
  		sm->pending_1_of_4_timeout = 1;
  	wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
  		   "counter %d)", timeout_ms, ctr);
  	eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
  			       wpa_send_eapol_timeout, wpa_auth, sm);
  }
  
  
  static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data,
  			      size_t data_len)
  {
  	struct ieee802_1x_hdr *hdr;
  	struct wpa_eapol_key *key;
  	struct wpa_eapol_key_192 *key192;
  	u16 key_info;
  	int ret = 0;
  	u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
  	size_t mic_len = wpa_mic_len(akmp);
  
  	if (data_len < sizeof(*hdr) + sizeof(*key))
  		return -1;
  
  	hdr = (struct ieee802_1x_hdr *) data;
  	key = (struct wpa_eapol_key *) (hdr + 1);
  	key192 = (struct wpa_eapol_key_192 *) (hdr + 1);
  	key_info = WPA_GET_BE16(key->key_info);
  	os_memcpy(mic, key192->key_mic, mic_len);
  	os_memset(key192->key_mic, 0, mic_len);
  	if (wpa_eapol_key_mic(PTK->kck, PTK->kck_len, akmp,
  			      key_info & WPA_KEY_INFO_TYPE_MASK,
  			      data, data_len, key192->key_mic) ||
  	    os_memcmp_const(mic, key192->key_mic, mic_len) != 0)
  		ret = -1;
  	os_memcpy(key192->key_mic, mic, mic_len);
  	return ret;
  }
  
  
  void wpa_remove_ptk(struct wpa_state_machine *sm)
  {
  	sm->PTK_valid = FALSE;
  	os_memset(&sm->PTK, 0, sizeof(sm->PTK));
  	wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
  	sm->pairwise_set = FALSE;
  	eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
  }
  
  
  int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event)
  {
  	int remove_ptk = 1;
  
  	if (sm == NULL)
  		return -1;
  
  	wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
  			 "event %d notification", event);
  
  	switch (event) {
  	case WPA_AUTH:
  #ifdef CONFIG_MESH
  		/* PTKs are derived through AMPE */
  		if (wpa_auth_start_ampe(sm->wpa_auth, sm->addr)) {
  			/* not mesh */
  			break;
  		}
  		return 0;
  #endif /* CONFIG_MESH */
  	case WPA_ASSOC:
  		break;
  	case WPA_DEAUTH:
  	case WPA_DISASSOC:
  		sm->DeauthenticationRequest = TRUE;
  		break;
  	case WPA_REAUTH:
  	case WPA_REAUTH_EAPOL:
  		if (!sm->started) {
  			/*
  			 * When using WPS, we may end up here if the STA
  			 * manages to re-associate without the previous STA
  			 * entry getting removed. Consequently, we need to make
  			 * sure that the WPA state machines gets initialized
  			 * properly at this point.
  			 */
  			wpa_printf(MSG_DEBUG, "WPA state machine had not been "
  				   "started - initialize now");
  			sm->started = 1;
  			sm->Init = TRUE;
  			if (wpa_sm_step(sm) == 1)
  				return 1; /* should not really happen */
  			sm->Init = FALSE;
  			sm->AuthenticationRequest = TRUE;
  			break;
  		}
  		if (sm->GUpdateStationKeys) {
  			/*
  			 * Reauthentication cancels the pending group key
  			 * update for this STA.
  			 */
  			sm->group->GKeyDoneStations--;
  			sm->GUpdateStationKeys = FALSE;
  			sm->PtkGroupInit = TRUE;
  		}
  		sm->ReAuthenticationRequest = TRUE;
  		break;
  	case WPA_ASSOC_FT:
  #ifdef CONFIG_IEEE80211R
  		wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
  			   "after association");
  		wpa_ft_install_ptk(sm);
  
  		/* Using FT protocol, not WPA auth state machine */
  		sm->ft_completed = 1;
  		return 0;
  #else /* CONFIG_IEEE80211R */
  		break;
  #endif /* CONFIG_IEEE80211R */
  	}
  
  #ifdef CONFIG_IEEE80211R
  	sm->ft_completed = 0;
  #endif /* CONFIG_IEEE80211R */
  
  #ifdef CONFIG_IEEE80211W
  	if (sm->mgmt_frame_prot && event == WPA_AUTH)
  		remove_ptk = 0;
  #endif /* CONFIG_IEEE80211W */
  
  	if (remove_ptk) {
  		sm->PTK_valid = FALSE;
  		os_memset(&sm->PTK, 0, sizeof(sm->PTK));
  
  		if (event != WPA_REAUTH_EAPOL)
  			wpa_remove_ptk(sm);
  	}
  
  	if (sm->in_step_loop) {
  		/*
  		 * wpa_sm_step() is already running - avoid recursive call to
  		 * it by making the existing loop process the new update.
  		 */
  		sm->changed = TRUE;
  		return 0;
  	}
  	return wpa_sm_step(sm);
  }
  
  
  SM_STATE(WPA_PTK, INITIALIZE)
  {
  	SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
  	if (sm->Init) {
  		/* Init flag is not cleared here, so avoid busy
  		 * loop by claiming nothing changed. */
  		sm->changed = FALSE;
  	}
  
  	sm->keycount = 0;
  	if (sm->GUpdateStationKeys)
  		sm->group->GKeyDoneStations--;
  	sm->GUpdateStationKeys = FALSE;
  	if (sm->wpa == WPA_VERSION_WPA)
  		sm->PInitAKeys = FALSE;
  	if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
  	       * Local AA > Remote AA)) */) {
  		sm->Pair = TRUE;
  	}
  	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
  	wpa_remove_ptk(sm);
  	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
  	sm->TimeoutCtr = 0;
  	if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
  		wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
  				   WPA_EAPOL_authorized, 0);
  	}
  }
  
  
  SM_STATE(WPA_PTK, DISCONNECT)
  {
  	SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
  	sm->Disconnect = FALSE;
  	wpa_sta_disconnect(sm->wpa_auth, sm->addr);
  }
  
  
  SM_STATE(WPA_PTK, DISCONNECTED)
  {
  	SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
  	sm->DeauthenticationRequest = FALSE;
  }
  
  
  SM_STATE(WPA_PTK, AUTHENTICATION)
  {
  	SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
  	os_memset(&sm->PTK, 0, sizeof(sm->PTK));
  	sm->PTK_valid = FALSE;
  	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
  			   1);
  	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
  	sm->AuthenticationRequest = FALSE;
  }
  
  
  static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
  				  struct wpa_group *group)
  {
  	if (group->first_sta_seen)
  		return;
  	/*
  	 * System has run bit further than at the time hostapd was started
  	 * potentially very early during boot up. This provides better chances
  	 * of collecting more randomness on embedded systems. Re-initialize the
  	 * GMK and Counter here to improve their strength if there was not
  	 * enough entropy available immediately after system startup.
  	 */
  	wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
  		   "station");
  	if (random_pool_ready() != 1) {
  		wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
  			   "to proceed - reject first 4-way handshake");
  		group->reject_4way_hs_for_entropy = TRUE;
  	} else {
  		group->first_sta_seen = TRUE;
  		group->reject_4way_hs_for_entropy = FALSE;
  	}
  
  	if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0 ||
  	    wpa_gtk_update(wpa_auth, group) < 0 ||
  	    wpa_group_config_group_keys(wpa_auth, group) < 0) {
  		wpa_printf(MSG_INFO, "WPA: GMK/GTK setup failed");
  		group->first_sta_seen = FALSE;
  		group->reject_4way_hs_for_entropy = TRUE;
  	}
  }
  
  
  SM_STATE(WPA_PTK, AUTHENTICATION2)
  {
  	SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
  
  	wpa_group_ensure_init(sm->wpa_auth, sm->group);
  	sm->ReAuthenticationRequest = FALSE;
  
  	/*
  	 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
  	 * ambiguous. The Authenticator state machine uses a counter that is
  	 * incremented by one for each 4-way handshake. However, the security
  	 * analysis of 4-way handshake points out that unpredictable nonces
  	 * help in preventing precomputation attacks. Instead of the state
  	 * machine definition, use an unpredictable nonce value here to provide
  	 * stronger protection against potential precomputation attacks.
  	 */
  	if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
  		wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
  			   "ANonce.");
  		sm->Disconnect = TRUE;
  		return;
  	}
  	wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
  		    WPA_NONCE_LEN);
  	/* IEEE 802.11i does not clear TimeoutCtr here, but this is more
  	 * logical place than INITIALIZE since AUTHENTICATION2 can be
  	 * re-entered on ReAuthenticationRequest without going through
  	 * INITIALIZE. */
  	sm->TimeoutCtr = 0;
  }
  
  
  SM_STATE(WPA_PTK, INITPMK)
  {
  	u8 msk[2 * PMK_LEN];
  	size_t len = 2 * PMK_LEN;
  
  	SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
  #ifdef CONFIG_IEEE80211R
  	sm->xxkey_len = 0;
  #endif /* CONFIG_IEEE80211R */
  	if (sm->pmksa) {
  		wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
  		os_memcpy(sm->PMK, sm->pmksa->pmk, sm->pmksa->pmk_len);
  		sm->pmk_len = sm->pmksa->pmk_len;
  	} else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
  		unsigned int pmk_len;
  
  		if (sm->wpa_key_mgmt & WPA_KEY_MGMT_IEEE8021X_SUITE_B_192)
  			pmk_len = PMK_LEN_SUITE_B_192;
  		else
  			pmk_len = PMK_LEN;
  		wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
  			   "(MSK len=%lu PMK len=%u)", (unsigned long) len,
  			   pmk_len);
  		if (len < pmk_len) {
  			wpa_printf(MSG_DEBUG,
  				   "WPA: MSK not long enough (%u) to create PMK (%u)",
  				   (unsigned int) len, (unsigned int) pmk_len);
  			sm->Disconnect = TRUE;
  			return;
  		}
  		os_memcpy(sm->PMK, msk, pmk_len);
  		sm->pmk_len = pmk_len;
  #ifdef CONFIG_IEEE80211R
  		if (len >= 2 * PMK_LEN) {
  			os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
  			sm->xxkey_len = PMK_LEN;
  		}
  #endif /* CONFIG_IEEE80211R */
  	} else {
  		wpa_printf(MSG_DEBUG, "WPA: Could not get PMK, get_msk: %p",
  			   sm->wpa_auth->cb.get_msk);
  		sm->Disconnect = TRUE;
  		return;
  	}
  	os_memset(msk, 0, sizeof(msk));
  
  	sm->req_replay_counter_used = 0;
  	/* IEEE 802.11i does not set keyRun to FALSE, but not doing this
  	 * will break reauthentication since EAPOL state machines may not be
  	 * get into AUTHENTICATING state that clears keyRun before WPA state
  	 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
  	 * state and takes PMK from the previously used AAA Key. This will
  	 * eventually fail in 4-Way Handshake because Supplicant uses PMK
  	 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
  	 * be good workaround for this issue. */
  	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
  }
  
  
  SM_STATE(WPA_PTK, INITPSK)
  {
  	const u8 *psk;
  	SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
  	psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL);
  	if (psk) {
  		os_memcpy(sm->PMK, psk, PMK_LEN);
  		sm->pmk_len = PMK_LEN;
  #ifdef CONFIG_IEEE80211R
  		os_memcpy(sm->xxkey, psk, PMK_LEN);
  		sm->xxkey_len = PMK_LEN;
  #endif /* CONFIG_IEEE80211R */
  	}
  	sm->req_replay_counter_used = 0;
  }
  
  
  SM_STATE(WPA_PTK, PTKSTART)
  {
  	u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
  	size_t pmkid_len = 0;
  
  	SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
  	sm->PTKRequest = FALSE;
  	sm->TimeoutEvt = FALSE;
  	sm->alt_snonce_valid = FALSE;
  
  	sm->TimeoutCtr++;
  	if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
  		/* No point in sending the EAPOL-Key - we will disconnect
  		 * immediately following this. */
  		return;
  	}
  
  	wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
  			"sending 1/4 msg of 4-Way Handshake");
  	/*
  	 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
  	 * one possible PSK for this STA.
  	 */
  	if (sm->wpa == WPA_VERSION_WPA2 &&
  	    wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
  	    sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) {
  		pmkid = buf;
  		pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
  		pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
  		pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
  		RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
  		if (sm->pmksa) {
  			os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
  				  sm->pmksa->pmkid, PMKID_LEN);
  		} else if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) {
  			/* No KCK available to derive PMKID */
  			pmkid = NULL;
  		} else {
  			/*
  			 * Calculate PMKID since no PMKSA cache entry was
  			 * available with pre-calculated PMKID.
  			 */
  			rsn_pmkid(sm->PMK, sm->pmk_len, sm->wpa_auth->addr,
  				  sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
  				  wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
  		}
  	}
  	wpa_send_eapol(sm->wpa_auth, sm,
  		       WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
  		       sm->ANonce, pmkid, pmkid_len, 0, 0);
  }
  
  
  static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
  			  const u8 *pmk, unsigned int pmk_len,
  			  struct wpa_ptk *ptk)
  {
  #ifdef CONFIG_IEEE80211R
  	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
  		return wpa_auth_derive_ptk_ft(sm, pmk, ptk);
  #endif /* CONFIG_IEEE80211R */
  
  	return wpa_pmk_to_ptk(pmk, pmk_len, "Pairwise key expansion",
  			      sm->wpa_auth->addr, sm->addr, sm->ANonce, snonce,
  			      ptk, sm->wpa_key_mgmt, sm->pairwise);
  }
  
  
  SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
  {
  	struct wpa_ptk PTK;
  	int ok = 0, psk_found = 0;
  	const u8 *pmk = NULL;
  	unsigned int pmk_len;
  
  	SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
  	sm->EAPOLKeyReceived = FALSE;
  	sm->update_snonce = FALSE;
  
  	/* WPA with IEEE 802.1X: use the derived PMK from EAP
  	 * WPA-PSK: iterate through possible PSKs and select the one matching
  	 * the packet */
  	for (;;) {
  		if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
  			pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
  					       sm->p2p_dev_addr, pmk);
  			if (pmk == NULL)
  				break;
  			psk_found = 1;
  			pmk_len = PMK_LEN;
  		} else {
  			pmk = sm->PMK;
  			pmk_len = sm->pmk_len;
  		}
  
  		wpa_derive_ptk(sm, sm->SNonce, pmk, pmk_len, &PTK);
  
  		if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK,
  				       sm->last_rx_eapol_key,
  				       sm->last_rx_eapol_key_len) == 0) {
  			ok = 1;
  			break;
  		}
  
  		if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
  			break;
  	}
  
  	if (!ok) {
  		wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
  				"invalid MIC in msg 2/4 of 4-Way Handshake");
  		if (psk_found)
  			wpa_auth_psk_failure_report(sm->wpa_auth, sm->addr);
  		return;
  	}
  
  #ifdef CONFIG_IEEE80211R
  	if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
  		/*
  		 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
  		 * with the value we derived.
  		 */
  		if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name,
  				    WPA_PMK_NAME_LEN) != 0) {
  			wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
  					"PMKR1Name mismatch in FT 4-way "
  					"handshake");
  			wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
  				    "Supplicant",
  				    sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
  			wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
  				    sm->pmk_r1_name, WPA_PMK_NAME_LEN);
  			return;
  		}
  	}
  #endif /* CONFIG_IEEE80211R */
  
  	sm->pending_1_of_4_timeout = 0;
  	eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
  
  	if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
  		/* PSK may have changed from the previous choice, so update
  		 * state machine data based on whatever PSK was selected here.
  		 */
  		os_memcpy(sm->PMK, pmk, PMK_LEN);
  		sm->pmk_len = PMK_LEN;
  	}
  
  	sm->MICVerified = TRUE;
  
  	os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
  	sm->PTK_valid = TRUE;
  }
  
  
  SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
  {
  	SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
  	sm->TimeoutCtr = 0;
  }
  
  
  #ifdef CONFIG_IEEE80211W
  
  static int ieee80211w_kde_len(struct wpa_state_machine *sm)
  {
  	if (sm->mgmt_frame_prot) {
  		size_t len;
  		len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
  		return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len;
  	}
  
  	return 0;
  }
  
  
  static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
  {
  	struct wpa_igtk_kde igtk;
  	struct wpa_group *gsm = sm->group;
  	u8 rsc[WPA_KEY_RSC_LEN];
  	size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
  
  	if (!sm->mgmt_frame_prot)
  		return pos;
  
  	igtk.keyid[0] = gsm->GN_igtk;
  	igtk.keyid[1] = 0;
  	if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
  	    wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
  		os_memset(igtk.pn, 0, sizeof(igtk.pn));
  	else
  		os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
  	os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len);
  	if (sm->wpa_auth->conf.disable_gtk) {
  		/*
  		 * Provide unique random IGTK to each STA to prevent use of
  		 * IGTK in the BSS.
  		 */
  		if (random_get_bytes(igtk.igtk, len) < 0)
  			return pos;
  	}
  	pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
  			  (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len,
  			  NULL, 0);
  
  	return pos;
  }
  
  #else /* CONFIG_IEEE80211W */
  
  static int ieee80211w_kde_len(struct wpa_state_machine *sm)
  {
  	return 0;
  }
  
  
  static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
  {
  	return pos;
  }
  
  #endif /* CONFIG_IEEE80211W */
  
  
  SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
  {
  	u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
  	size_t gtk_len, kde_len;
  	struct wpa_group *gsm = sm->group;
  	u8 *wpa_ie;
  	int wpa_ie_len, secure, keyidx, encr = 0;
  
  	SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
  	sm->TimeoutEvt = FALSE;
  
  	sm->TimeoutCtr++;
  	if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
  		/* No point in sending the EAPOL-Key - we will disconnect
  		 * immediately following this. */
  		return;
  	}
  
  	/* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
  	   GTK[GN], IGTK, [FTIE], [TIE * 2])
  	 */
  	os_memset(rsc, 0, WPA_KEY_RSC_LEN);
  	wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
  	/* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
  	wpa_ie = sm->wpa_auth->wpa_ie;
  	wpa_ie_len = sm->wpa_auth->wpa_ie_len;
  	if (sm->wpa == WPA_VERSION_WPA &&
  	    (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
  	    wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
  		/* WPA-only STA, remove RSN IE and possible MDIE */
  		wpa_ie = wpa_ie + wpa_ie[1] + 2;
  		if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN)
  			wpa_ie = wpa_ie + wpa_ie[1] + 2;
  		wpa_ie_len = wpa_ie[1] + 2;
  	}
  	wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
  			"sending 3/4 msg of 4-Way Handshake");
  	if (sm->wpa == WPA_VERSION_WPA2) {
  		/* WPA2 send GTK in the 4-way handshake */
  		secure = 1;
  		gtk = gsm->GTK[gsm->GN - 1];
  		gtk_len = gsm->GTK_len;
  		if (sm->wpa_auth->conf.disable_gtk) {
  			/*
  			 * Provide unique random GTK to each STA to prevent use
  			 * of GTK in the BSS.
  			 */
  			if (random_get_bytes(dummy_gtk, gtk_len) < 0)
  				return;
  			gtk = dummy_gtk;
  		}
  		keyidx = gsm->GN;
  		_rsc = rsc;
  		encr = 1;
  	} else {
  		/* WPA does not include GTK in msg 3/4 */
  		secure = 0;
  		gtk = NULL;
  		gtk_len = 0;
  		keyidx = 0;
  		_rsc = NULL;
  		if (sm->rx_eapol_key_secure) {
  			/*
  			 * It looks like Windows 7 supplicant tries to use
  			 * Secure bit in msg 2/4 after having reported Michael
  			 * MIC failure and it then rejects the 4-way handshake
  			 * if msg 3/4 does not set Secure bit. Work around this
  			 * by setting the Secure bit here even in the case of
  			 * WPA if the supplicant used it first.
  			 */
  			wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
  					"STA used Secure bit in WPA msg 2/4 - "
  					"set Secure for 3/4 as workaround");
  			secure = 1;
  		}
  	}
  
  	kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
  	if (gtk)
  		kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
  #ifdef CONFIG_IEEE80211R
  	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
  		kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
  		kde_len += 300; /* FTIE + 2 * TIE */
  	}
  #endif /* CONFIG_IEEE80211R */
  #ifdef CONFIG_P2P
  	if (WPA_GET_BE32(sm->ip_addr) > 0)
  		kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
  #endif /* CONFIG_P2P */
  	kde = os_malloc(kde_len);
  	if (kde == NULL)
  		return;
  
  	pos = kde;
  	os_memcpy(pos, wpa_ie, wpa_ie_len);
  	pos += wpa_ie_len;
  #ifdef CONFIG_IEEE80211R
  	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
  		int res;
  		size_t elen;
  
  		elen = pos - kde;
  		res = wpa_insert_pmkid(kde, &elen, sm->pmk_r1_name);
  		if (res < 0) {
  			wpa_printf(MSG_ERROR, "FT: Failed to insert "
  				   "PMKR1Name into RSN IE in EAPOL-Key data");
  			os_free(kde);
  			return;
  		}
  		pos -= wpa_ie_len;
  		pos += elen;
  	}
  #endif /* CONFIG_IEEE80211R */
  	if (gtk) {
  		u8 hdr[2];
  		hdr[0] = keyidx & 0x03;
  		hdr[1] = 0;
  		pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
  				  gtk, gtk_len);
  	}
  	pos = ieee80211w_kde_add(sm, pos);
  
  #ifdef CONFIG_IEEE80211R
  	if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
  		int res;
  		struct wpa_auth_config *conf;
  
  		conf = &sm->wpa_auth->conf;
  		if (sm->assoc_resp_ftie &&
  		    kde + kde_len - pos >= 2 + sm->assoc_resp_ftie[1]) {
  			os_memcpy(pos, sm->assoc_resp_ftie,
  				  2 + sm->assoc_resp_ftie[1]);
  			res = 2 + sm->assoc_resp_ftie[1];
  		} else {
  			res = wpa_write_ftie(conf, conf->r0_key_holder,
  					     conf->r0_key_holder_len,
  					     NULL, NULL, pos,
  					     kde + kde_len - pos,
  					     NULL, 0);
  		}
  		if (res < 0) {
  			wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
  				   "into EAPOL-Key Key Data");
  			os_free(kde);
  			return;
  		}
  		pos += res;
  
  		/* TIE[ReassociationDeadline] (TU) */
  		*pos++ = WLAN_EID_TIMEOUT_INTERVAL;
  		*pos++ = 5;
  		*pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
  		WPA_PUT_LE32(pos, conf->reassociation_deadline);
  		pos += 4;
  
  		/* TIE[KeyLifetime] (seconds) */
  		*pos++ = WLAN_EID_TIMEOUT_INTERVAL;
  		*pos++ = 5;
  		*pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
  		WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
  		pos += 4;
  	}
  #endif /* CONFIG_IEEE80211R */
  #ifdef CONFIG_P2P
  	if (WPA_GET_BE32(sm->ip_addr) > 0) {
  		u8 addr[3 * 4];
  		os_memcpy(addr, sm->ip_addr, 4);
  		os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
  		os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
  		pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
  				  addr, sizeof(addr), NULL, 0);
  	}
  #endif /* CONFIG_P2P */
  
  	wpa_send_eapol(sm->wpa_auth, sm,
  		       (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
  		       WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
  		       WPA_KEY_INFO_KEY_TYPE,
  		       _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
  	os_free(kde);
  }
  
  
  SM_STATE(WPA_PTK, PTKINITDONE)
  {
  	SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
  	sm->EAPOLKeyReceived = FALSE;
  	if (sm->Pair) {
  		enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
  		int klen = wpa_cipher_key_len(sm->pairwise);
  		if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
  				     sm->PTK.tk, klen)) {
  			wpa_sta_disconnect(sm->wpa_auth, sm->addr);
  			return;
  		}
  		/* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
  		sm->pairwise_set = TRUE;
  
  		if (sm->wpa_auth->conf.wpa_ptk_rekey) {
  			eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
  			eloop_register_timeout(sm->wpa_auth->conf.
  					       wpa_ptk_rekey, 0, wpa_rekey_ptk,
  					       sm->wpa_auth, sm);
  		}
  
  		if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
  			wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
  					   WPA_EAPOL_authorized, 1);
  		}
  	}
  
  	if (0 /* IBSS == TRUE */) {
  		sm->keycount++;
  		if (sm->keycount == 2) {
  			wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
  					   WPA_EAPOL_portValid, 1);
  		}
  	} else {
  		wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
  				   1);
  	}
  	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
  	wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
  	if (sm->wpa == WPA_VERSION_WPA)
  		sm->PInitAKeys = TRUE;
  	else
  		sm->has_GTK = TRUE;
  	wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
  			 "pairwise key handshake completed (%s)",
  			 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
  
  #ifdef CONFIG_IEEE80211R
  	wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
  #endif /* CONFIG_IEEE80211R */
  }
  
  
  SM_STEP(WPA_PTK)
  {
  	struct wpa_authenticator *wpa_auth = sm->wpa_auth;
  
  	if (sm->Init)
  		SM_ENTER(WPA_PTK, INITIALIZE);
  	else if (sm->Disconnect
  		 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
  		wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
  				"WPA_PTK: sm->Disconnect");
  		SM_ENTER(WPA_PTK, DISCONNECT);
  	}
  	else if (sm->DeauthenticationRequest)
  		SM_ENTER(WPA_PTK, DISCONNECTED);
  	else if (sm->AuthenticationRequest)
  		SM_ENTER(WPA_PTK, AUTHENTICATION);
  	else if (sm->ReAuthenticationRequest)
  		SM_ENTER(WPA_PTK, AUTHENTICATION2);
  	else if (sm->PTKRequest)
  		SM_ENTER(WPA_PTK, PTKSTART);
  	else switch (sm->wpa_ptk_state) {
  	case WPA_PTK_INITIALIZE:
  		break;
  	case WPA_PTK_DISCONNECT:
  		SM_ENTER(WPA_PTK, DISCONNECTED);
  		break;
  	case WPA_PTK_DISCONNECTED:
  		SM_ENTER(WPA_PTK, INITIALIZE);
  		break;
  	case WPA_PTK_AUTHENTICATION:
  		SM_ENTER(WPA_PTK, AUTHENTICATION2);
  		break;
  	case WPA_PTK_AUTHENTICATION2:
  		if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
  		    wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
  				       WPA_EAPOL_keyRun) > 0)
  			SM_ENTER(WPA_PTK, INITPMK);
  		else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
  			 /* FIX: && 802.1X::keyRun */)
  			SM_ENTER(WPA_PTK, INITPSK);
  		break;
  	case WPA_PTK_INITPMK:
  		if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
  				       WPA_EAPOL_keyAvailable) > 0)
  			SM_ENTER(WPA_PTK, PTKSTART);
  		else {
  			wpa_auth->dot11RSNA4WayHandshakeFailures++;
  			wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
  					"INITPMK - keyAvailable = false");
  			SM_ENTER(WPA_PTK, DISCONNECT);
  		}
  		break;
  	case WPA_PTK_INITPSK:
  		if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
  				     NULL))
  			SM_ENTER(WPA_PTK, PTKSTART);
  		else {
  			wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
  					"no PSK configured for the STA");
  			wpa_auth->dot11RSNA4WayHandshakeFailures++;
  			SM_ENTER(WPA_PTK, DISCONNECT);
  		}
  		break;
  	case WPA_PTK_PTKSTART:
  		if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
  		    sm->EAPOLKeyPairwise)
  			SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
  		else if (sm->TimeoutCtr >
  			 (int) dot11RSNAConfigPairwiseUpdateCount) {
  			wpa_auth->dot11RSNA4WayHandshakeFailures++;
  			wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
  					 "PTKSTART: Retry limit %d reached",
  					 dot11RSNAConfigPairwiseUpdateCount);
  			SM_ENTER(WPA_PTK, DISCONNECT);
  		} else if (sm->TimeoutEvt)
  			SM_ENTER(WPA_PTK, PTKSTART);
  		break;
  	case WPA_PTK_PTKCALCNEGOTIATING:
  		if (sm->MICVerified)
  			SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
  		else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
  			 sm->EAPOLKeyPairwise)
  			SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
  		else if (sm->TimeoutEvt)
  			SM_ENTER(WPA_PTK, PTKSTART);
  		break;
  	case WPA_PTK_PTKCALCNEGOTIATING2:
  		SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
  		break;
  	case WPA_PTK_PTKINITNEGOTIATING:
  		if (sm->update_snonce)
  			SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
  		else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
  			 sm->EAPOLKeyPairwise && sm->MICVerified)
  			SM_ENTER(WPA_PTK, PTKINITDONE);
  		else if (sm->TimeoutCtr >
  			 (int) dot11RSNAConfigPairwiseUpdateCount) {
  			wpa_auth->dot11RSNA4WayHandshakeFailures++;
  			wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
  					 "PTKINITNEGOTIATING: Retry limit %d "
  					 "reached",
  					 dot11RSNAConfigPairwiseUpdateCount);
  			SM_ENTER(WPA_PTK, DISCONNECT);
  		} else if (sm->TimeoutEvt)
  			SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
  		break;
  	case WPA_PTK_PTKINITDONE:
  		break;
  	}
  }
  
  
  SM_STATE(WPA_PTK_GROUP, IDLE)
  {
  	SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
  	if (sm->Init) {
  		/* Init flag is not cleared here, so avoid busy
  		 * loop by claiming nothing changed. */
  		sm->changed = FALSE;
  	}
  	sm->GTimeoutCtr = 0;
  }
  
  
  SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
  {
  	u8 rsc[WPA_KEY_RSC_LEN];
  	struct wpa_group *gsm = sm->group;
  	const u8 *kde;
  	u8 *kde_buf = NULL, *pos, hdr[2];
  	size_t kde_len;
  	u8 *gtk, dummy_gtk[32];
  
  	SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
  
  	sm->GTimeoutCtr++;
  	if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
  		/* No point in sending the EAPOL-Key - we will disconnect
  		 * immediately following this. */
  		return;
  	}
  
  	if (sm->wpa == WPA_VERSION_WPA)
  		sm->PInitAKeys = FALSE;
  	sm->TimeoutEvt = FALSE;
  	/* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
  	os_memset(rsc, 0, WPA_KEY_RSC_LEN);
  	if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
  		wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
  	wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
  			"sending 1/2 msg of Group Key Handshake");
  
  	gtk = gsm->GTK[gsm->GN - 1];
  	if (sm->wpa_auth->conf.disable_gtk) {
  		/*
  		 * Provide unique random GTK to each STA to prevent use
  		 * of GTK in the BSS.
  		 */
  		if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
  			return;
  		gtk = dummy_gtk;
  	}
  	if (sm->wpa == WPA_VERSION_WPA2) {
  		kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
  			ieee80211w_kde_len(sm);
  		kde_buf = os_malloc(kde_len);
  		if (kde_buf == NULL)
  			return;
  
  		kde = pos = kde_buf;
  		hdr[0] = gsm->GN & 0x03;
  		hdr[1] = 0;
  		pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
  				  gtk, gsm->GTK_len);
  		pos = ieee80211w_kde_add(sm, pos);
  		kde_len = pos - kde;
  	} else {
  		kde = gtk;
  		kde_len = gsm->GTK_len;
  	}
  
  	wpa_send_eapol(sm->wpa_auth, sm,
  		       WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
  		       WPA_KEY_INFO_ACK |
  		       (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
  		       rsc, gsm->GNonce, kde, kde_len, gsm->GN, 1);
  
  	os_free(kde_buf);
  }
  
  
  SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
  {
  	SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
  	sm->EAPOLKeyReceived = FALSE;
  	if (sm->GUpdateStationKeys)
  		sm->group->GKeyDoneStations--;
  	sm->GUpdateStationKeys = FALSE;
  	sm->GTimeoutCtr = 0;
  	/* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
  	wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
  			 "group key handshake completed (%s)",
  			 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
  	sm->has_GTK = TRUE;
  }
  
  
  SM_STATE(WPA_PTK_GROUP, KEYERROR)
  {
  	SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
  	if (sm->GUpdateStationKeys)
  		sm->group->GKeyDoneStations--;
  	sm->GUpdateStationKeys = FALSE;
  	sm->Disconnect = TRUE;
  }
  
  
  SM_STEP(WPA_PTK_GROUP)
  {
  	if (sm->Init || sm->PtkGroupInit) {
  		SM_ENTER(WPA_PTK_GROUP, IDLE);
  		sm->PtkGroupInit = FALSE;
  	} else switch (sm->wpa_ptk_group_state) {
  	case WPA_PTK_GROUP_IDLE:
  		if (sm->GUpdateStationKeys ||
  		    (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
  			SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
  		break;
  	case WPA_PTK_GROUP_REKEYNEGOTIATING:
  		if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
  		    !sm->EAPOLKeyPairwise && sm->MICVerified)
  			SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
  		else if (sm->GTimeoutCtr >
  			 (int) dot11RSNAConfigGroupUpdateCount)
  			SM_ENTER(WPA_PTK_GROUP, KEYERROR);
  		else if (sm->TimeoutEvt)
  			SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
  		break;
  	case WPA_PTK_GROUP_KEYERROR:
  		SM_ENTER(WPA_PTK_GROUP, IDLE);
  		break;
  	case WPA_PTK_GROUP_REKEYESTABLISHED:
  		SM_ENTER(WPA_PTK_GROUP, IDLE);
  		break;
  	}
  }
  
  
  static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
  			  struct wpa_group *group)
  {
  	int ret = 0;
  
  	os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
  	inc_byte_array(group->Counter, WPA_NONCE_LEN);
  	if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
  			   wpa_auth->addr, group->GNonce,
  			   group->GTK[group->GN - 1], group->GTK_len) < 0)
  		ret = -1;
  	wpa_hexdump_key(MSG_DEBUG, "GTK",
  			group->GTK[group->GN - 1], group->GTK_len);
  
  #ifdef CONFIG_IEEE80211W
  	if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
  		size_t len;
  		len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
  		os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
  		inc_byte_array(group->Counter, WPA_NONCE_LEN);
  		if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
  				   wpa_auth->addr, group->GNonce,
  				   group->IGTK[group->GN_igtk - 4], len) < 0)
  			ret = -1;
  		wpa_hexdump_key(MSG_DEBUG, "IGTK",
  				group->IGTK[group->GN_igtk - 4], len);
  	}
  #endif /* CONFIG_IEEE80211W */
  
  	return ret;
  }
  
  
  static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
  			       struct wpa_group *group)
  {
  	wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
  		   "GTK_INIT (VLAN-ID %d)", group->vlan_id);
  	group->changed = FALSE; /* GInit is not cleared here; avoid loop */
  	group->wpa_group_state = WPA_GROUP_GTK_INIT;
  
  	/* GTK[0..N] = 0 */
  	os_memset(group->GTK, 0, sizeof(group->GTK));
  	group->GN = 1;
  	group->GM = 2;
  #ifdef CONFIG_IEEE80211W
  	group->GN_igtk = 4;
  	group->GM_igtk = 5;
  #endif /* CONFIG_IEEE80211W */
  	/* GTK[GN] = CalcGTK() */
  	wpa_gtk_update(wpa_auth, group);
  }
  
  
  static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
  {
  	if (ctx != NULL && ctx != sm->group)
  		return 0;
  
  	if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
  		wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
  				"Not in PTKINITDONE; skip Group Key update");
  		sm->GUpdateStationKeys = FALSE;
  		return 0;
  	}
  	if (sm->GUpdateStationKeys) {
  		/*
  		 * This should not really happen, so add a debug log entry.
  		 * Since we clear the GKeyDoneStations before the loop, the
  		 * station needs to be counted here anyway.
  		 */
  		wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
  				"GUpdateStationKeys was already set when "
  				"marking station for GTK rekeying");
  	}
  
  	/* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
  	if (sm->is_wnmsleep)
  		return 0;
  
  	sm->group->GKeyDoneStations++;
  	sm->GUpdateStationKeys = TRUE;
  
  	wpa_sm_step(sm);
  	return 0;
  }
  
  
  #ifdef CONFIG_WNM
  /* update GTK when exiting WNM-Sleep Mode */
  void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
  {
  	if (sm == NULL || sm->is_wnmsleep)
  		return;
  
  	wpa_group_update_sta(sm, NULL);
  }
  
  
  void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
  {
  	if (sm)
  		sm->is_wnmsleep = !!flag;
  }
  
  
  int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
  {
  	struct wpa_group *gsm = sm->group;
  	u8 *start = pos;
  
  	/*
  	 * GTK subelement:
  	 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
  	 * Key[5..32]
  	 */
  	*pos++ = WNM_SLEEP_SUBELEM_GTK;
  	*pos++ = 11 + gsm->GTK_len;
  	/* Key ID in B0-B1 of Key Info */
  	WPA_PUT_LE16(pos, gsm->GN & 0x03);
  	pos += 2;
  	*pos++ = gsm->GTK_len;
  	if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
  		return 0;
  	pos += 8;
  	os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
  	pos += gsm->GTK_len;
  
  	wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
  		   gsm->GN);
  	wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
  			gsm->GTK[gsm->GN - 1], gsm->GTK_len);
  
  	return pos - start;
  }
  
  
  #ifdef CONFIG_IEEE80211W
  int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
  {
  	struct wpa_group *gsm = sm->group;
  	u8 *start = pos;
  	size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
  
  	/*
  	 * IGTK subelement:
  	 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
  	 */
  	*pos++ = WNM_SLEEP_SUBELEM_IGTK;
  	*pos++ = 2 + 6 + len;
  	WPA_PUT_LE16(pos, gsm->GN_igtk);
  	pos += 2;
  	if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
  		return 0;
  	pos += 6;
  
  	os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len);
  	pos += len;
  
  	wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
  		   gsm->GN_igtk);
  	wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
  			gsm->IGTK[gsm->GN_igtk - 4], len);
  
  	return pos - start;
  }
  #endif /* CONFIG_IEEE80211W */
  #endif /* CONFIG_WNM */
  
  
  static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
  			      struct wpa_group *group)
  {
  	int tmp;
  
  	wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
  		   "SETKEYS (VLAN-ID %d)", group->vlan_id);
  	group->changed = TRUE;
  	group->wpa_group_state = WPA_GROUP_SETKEYS;
  	group->GTKReKey = FALSE;
  	tmp = group->GM;
  	group->GM = group->GN;
  	group->GN = tmp;
  #ifdef CONFIG_IEEE80211W
  	tmp = group->GM_igtk;
  	group->GM_igtk = group->GN_igtk;
  	group->GN_igtk = tmp;
  #endif /* CONFIG_IEEE80211W */
  	/* "GKeyDoneStations = GNoStations" is done in more robust way by
  	 * counting the STAs that are marked with GUpdateStationKeys instead of
  	 * including all STAs that could be in not-yet-completed state. */
  	wpa_gtk_update(wpa_auth, group);
  
  	if (group->GKeyDoneStations) {
  		wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
  			   "GKeyDoneStations=%d when starting new GTK rekey",
  			   group->GKeyDoneStations);
  		group->GKeyDoneStations = 0;
  	}
  	wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
  	wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
  		   group->GKeyDoneStations);
  }
  
  
  static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
  				       struct wpa_group *group)
  {
  	int ret = 0;
  
  	if (wpa_auth_set_key(wpa_auth, group->vlan_id,
  			     wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
  			     broadcast_ether_addr, group->GN,
  			     group->GTK[group->GN - 1], group->GTK_len) < 0)
  		ret = -1;
  
  #ifdef CONFIG_IEEE80211W
  	if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
  		enum wpa_alg alg;
  		size_t len;
  
  		alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher);
  		len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
  
  		if (ret == 0 &&
  		    wpa_auth_set_key(wpa_auth, group->vlan_id, alg,
  				     broadcast_ether_addr, group->GN_igtk,
  				     group->IGTK[group->GN_igtk - 4], len) < 0)
  			ret = -1;
  	}
  #endif /* CONFIG_IEEE80211W */
  
  	return ret;
  }
  
  
  static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
  {
  	if (sm->group == ctx) {
  		wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
  			   " for discconnection due to fatal failure",
  			   MAC2STR(sm->addr));
  		sm->Disconnect = TRUE;
  	}
  
  	return 0;
  }
  
  
  static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
  				    struct wpa_group *group)
  {
  	wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
  	group->changed = TRUE;
  	group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
  	wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
  }
  
  
  static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
  				 struct wpa_group *group)
  {
  	wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
  		   "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
  	group->changed = TRUE;
  	group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
  
  	if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
  		wpa_group_fatal_failure(wpa_auth, group);
  		return -1;
  	}
  
  	return 0;
  }
  
  
  static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
  			      struct wpa_group *group)
  {
  	if (group->GInit) {
  		wpa_group_gtk_init(wpa_auth, group);
  	} else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
  		/* Do not allow group operations */
  	} else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
  		   group->GTKAuthenticator) {
  		wpa_group_setkeysdone(wpa_auth, group);
  	} else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
  		   group->GTKReKey) {
  		wpa_group_setkeys(wpa_auth, group);
  	} else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
  		if (group->GKeyDoneStations == 0)
  			wpa_group_setkeysdone(wpa_auth, group);
  		else if (group->GTKReKey)
  			wpa_group_setkeys(wpa_auth, group);
  	}
  }
  
  
  static int wpa_sm_step(struct wpa_state_machine *sm)
  {
  	if (sm == NULL)
  		return 0;
  
  	if (sm->in_step_loop) {
  		/* This should not happen, but if it does, make sure we do not
  		 * end up freeing the state machine too early by exiting the
  		 * recursive call. */
  		wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
  		return 0;
  	}
  
  	sm->in_step_loop = 1;
  	do {
  		if (sm->pending_deinit)
  			break;
  
  		sm->changed = FALSE;
  		sm->wpa_auth->group->changed = FALSE;
  
  		SM_STEP_RUN(WPA_PTK);
  		if (sm->pending_deinit)
  			break;
  		SM_STEP_RUN(WPA_PTK_GROUP);
  		if (sm->pending_deinit)
  			break;
  		wpa_group_sm_step(sm->wpa_auth, sm->group);
  	} while (sm->changed || sm->wpa_auth->group->changed);
  	sm->in_step_loop = 0;
  
  	if (sm->pending_deinit) {
  		wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
  			   "machine deinit for " MACSTR, MAC2STR(sm->addr));
  		wpa_free_sta_sm(sm);
  		return 1;
  	}
  	return 0;
  }
  
  
  static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
  {
  	struct wpa_state_machine *sm = eloop_ctx;
  	wpa_sm_step(sm);
  }
  
  
  void wpa_auth_sm_notify(struct wpa_state_machine *sm)
  {
  	if (sm == NULL)
  		return;
  	eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
  }
  
  
  void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
  {
  	int tmp, i;
  	struct wpa_group *group;
  
  	if (wpa_auth == NULL)
  		return;
  
  	group = wpa_auth->group;
  
  	for (i = 0; i < 2; i++) {
  		tmp = group->GM;
  		group->GM = group->GN;
  		group->GN = tmp;
  #ifdef CONFIG_IEEE80211W
  		tmp = group->GM_igtk;
  		group->GM_igtk = group->GN_igtk;
  		group->GN_igtk = tmp;
  #endif /* CONFIG_IEEE80211W */
  		wpa_gtk_update(wpa_auth, group);
  		wpa_group_config_group_keys(wpa_auth, group);
  	}
  }
  
  
  static const char * wpa_bool_txt(int val)
  {
  	return val ? "TRUE" : "FALSE";
  }
  
  
  #define RSN_SUITE "%02x-%02x-%02x-%d"
  #define RSN_SUITE_ARG(s) \
  ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
  
  int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
  {
  	int len = 0, ret;
  	char pmkid_txt[PMKID_LEN * 2 + 1];
  #ifdef CONFIG_RSN_PREAUTH
  	const int preauth = 1;
  #else /* CONFIG_RSN_PREAUTH */
  	const int preauth = 0;
  #endif /* CONFIG_RSN_PREAUTH */
  
  	if (wpa_auth == NULL)
  		return len;
  
  	ret = os_snprintf(buf + len, buflen - len,
  			  "dot11RSNAOptionImplemented=TRUE\n"
  			  "dot11RSNAPreauthenticationImplemented=%s\n"
  			  "dot11RSNAEnabled=%s\n"
  			  "dot11RSNAPreauthenticationEnabled=%s\n",
  			  wpa_bool_txt(preauth),
  			  wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
  			  wpa_bool_txt(wpa_auth->conf.rsn_preauth));
  	if (os_snprintf_error(buflen - len, ret))
  		return len;
  	len += ret;
  
  	wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
  			 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
  
  	ret = os_snprintf(
  		buf + len, buflen - len,
  		"dot11RSNAConfigVersion=%u\n"
  		"dot11RSNAConfigPairwiseKeysSupported=9999\n"
  		/* FIX: dot11RSNAConfigGroupCipher */
  		/* FIX: dot11RSNAConfigGroupRekeyMethod */
  		/* FIX: dot11RSNAConfigGroupRekeyTime */
  		/* FIX: dot11RSNAConfigGroupRekeyPackets */
  		"dot11RSNAConfigGroupRekeyStrict=%u\n"
  		"dot11RSNAConfigGroupUpdateCount=%u\n"
  		"dot11RSNAConfigPairwiseUpdateCount=%u\n"
  		"dot11RSNAConfigGroupCipherSize=%u\n"
  		"dot11RSNAConfigPMKLifetime=%u\n"
  		"dot11RSNAConfigPMKReauthThreshold=%u\n"
  		"dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
  		"dot11RSNAConfigSATimeout=%u\n"
  		"dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
  		"dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
  		"dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
  		"dot11RSNAPMKIDUsed=%s\n"
  		"dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
  		"dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
  		"dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
  		"dot11RSNATKIPCounterMeasuresInvoked=%u\n"
  		"dot11RSNA4WayHandshakeFailures=%u\n"
  		"dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
  		RSN_VERSION,
  		!!wpa_auth->conf.wpa_strict_rekey,
  		dot11RSNAConfigGroupUpdateCount,
  		dot11RSNAConfigPairwiseUpdateCount,
  		wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
  		dot11RSNAConfigPMKLifetime,
  		dot11RSNAConfigPMKReauthThreshold,
  		dot11RSNAConfigSATimeout,
  		RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
  		RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
  		RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
  		pmkid_txt,
  		RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
  		RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
  		RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
  		wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
  		wpa_auth->dot11RSNA4WayHandshakeFailures);
  	if (os_snprintf_error(buflen - len, ret))
  		return len;
  	len += ret;
  
  	/* TODO: dot11RSNAConfigPairwiseCiphersTable */
  	/* TODO: dot11RSNAConfigAuthenticationSuitesTable */
  
  	/* Private MIB */
  	ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
  			  wpa_auth->group->wpa_group_state);
  	if (os_snprintf_error(buflen - len, ret))
  		return len;
  	len += ret;
  
  	return len;
  }
  
  
  int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
  {
  	int len = 0, ret;
  	u32 pairwise = 0;
  
  	if (sm == NULL)
  		return 0;
  
  	/* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
  
  	/* dot11RSNAStatsEntry */
  
  	pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
  				       WPA_PROTO_RSN : WPA_PROTO_WPA,
  				       sm->pairwise);
  	if (pairwise == 0)
  		return 0;
  
  	ret = os_snprintf(
  		buf + len, buflen - len,
  		/* TODO: dot11RSNAStatsIndex */
  		"dot11RSNAStatsSTAAddress=" MACSTR "\n"
  		"dot11RSNAStatsVersion=1\n"
  		"dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
  		/* TODO: dot11RSNAStatsTKIPICVErrors */
  		"dot11RSNAStatsTKIPLocalMICFailures=%u\n"
  		"dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
  		/* TODO: dot11RSNAStatsCCMPReplays */
  		/* TODO: dot11RSNAStatsCCMPDecryptErrors */
  		/* TODO: dot11RSNAStatsTKIPReplays */,
  		MAC2STR(sm->addr),
  		RSN_SUITE_ARG(pairwise),
  		sm->dot11RSNAStatsTKIPLocalMICFailures,
  		sm->dot11RSNAStatsTKIPRemoteMICFailures);
  	if (os_snprintf_error(buflen - len, ret))
  		return len;
  	len += ret;
  
  	/* Private MIB */
  	ret = os_snprintf(buf + len, buflen - len,
  			  "hostapdWPAPTKState=%d\n"
  			  "hostapdWPAPTKGroupState=%d\n",
  			  sm->wpa_ptk_state,
  			  sm->wpa_ptk_group_state);
  	if (os_snprintf_error(buflen - len, ret))
  		return len;
  	len += ret;
  
  	return len;
  }
  
  
  void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
  {
  	if (wpa_auth)
  		wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
  }
  
  
  int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
  {
  	return sm && sm->pairwise_set;
  }
  
  
  int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
  {
  	return sm->pairwise;
  }
  
  
  int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
  {
  	if (sm == NULL)
  		return -1;
  	return sm->wpa_key_mgmt;
  }
  
  
  int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
  {
  	if (sm == NULL)
  		return 0;
  	return sm->wpa;
  }
  
  
  int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
  			     struct rsn_pmksa_cache_entry *entry)
  {
  	if (sm == NULL || sm->pmksa != entry)
  		return -1;
  	sm->pmksa = NULL;
  	return 0;
  }
  
  
  struct rsn_pmksa_cache_entry *
  wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
  {
  	return sm ? sm->pmksa : NULL;
  }
  
  
  void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
  {
  	if (sm)
  		sm->dot11RSNAStatsTKIPLocalMICFailures++;
  }
  
  
  const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
  {
  	if (wpa_auth == NULL)
  		return NULL;
  	*len = wpa_auth->wpa_ie_len;
  	return wpa_auth->wpa_ie;
  }
  
  
  int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
  		       unsigned int pmk_len,
  		       int session_timeout, struct eapol_state_machine *eapol)
  {
  	if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
  	    sm->wpa_auth->conf.disable_pmksa_caching)
  		return -1;
  
  	if (sm->wpa_key_mgmt & WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) {
  		if (pmk_len > PMK_LEN_SUITE_B_192)
  			pmk_len = PMK_LEN_SUITE_B_192;
  	} else if (pmk_len > PMK_LEN) {
  		pmk_len = PMK_LEN;
  	}
  
  	if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, pmk_len, NULL,
  				 sm->PTK.kck, sm->PTK.kck_len,
  				 sm->wpa_auth->addr, sm->addr, session_timeout,
  				 eapol, sm->wpa_key_mgmt))
  		return 0;
  
  	return -1;
  }
  
  
  int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
  			       const u8 *pmk, size_t len, const u8 *sta_addr,
  			       int session_timeout,
  			       struct eapol_state_machine *eapol)
  {
  	if (wpa_auth == NULL)
  		return -1;
  
  	if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, NULL,
  				 NULL, 0,
  				 wpa_auth->addr,
  				 sta_addr, session_timeout, eapol,
  				 WPA_KEY_MGMT_IEEE8021X))
  		return 0;
  
  	return -1;
  }
  
  
  int wpa_auth_pmksa_add_sae(struct wpa_authenticator *wpa_auth, const u8 *addr,
  			   const u8 *pmk, const u8 *pmkid)
  {
  	if (wpa_auth->conf.disable_pmksa_caching)
  		return -1;
  
  	if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, PMK_LEN, pmkid,
  				 NULL, 0,
  				 wpa_auth->addr, addr, 0, NULL,
  				 WPA_KEY_MGMT_SAE))
  		return 0;
  
  	return -1;
  }
  
  
  void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
  			   const u8 *sta_addr)
  {
  	struct rsn_pmksa_cache_entry *pmksa;
  
  	if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
  		return;
  	pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
  	if (pmksa) {
  		wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
  			   MACSTR " based on request", MAC2STR(sta_addr));
  		pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
  	}
  }
  
  
  int wpa_auth_pmksa_list(struct wpa_authenticator *wpa_auth, char *buf,
  			size_t len)
  {
  	if (!wpa_auth || !wpa_auth->pmksa)
  		return 0;
  	return pmksa_cache_auth_list(wpa_auth->pmksa, buf, len);
  }
  
  
  void wpa_auth_pmksa_flush(struct wpa_authenticator *wpa_auth)
  {
  	if (wpa_auth && wpa_auth->pmksa)
  		pmksa_cache_auth_flush(wpa_auth->pmksa);
  }
  
  
  struct rsn_pmksa_cache_entry *
  wpa_auth_pmksa_get(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
  {
  	if (!wpa_auth || !wpa_auth->pmksa)
  		return NULL;
  	return pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
  }
  
  
  void wpa_auth_pmksa_set_to_sm(struct rsn_pmksa_cache_entry *pmksa,
  			      struct wpa_state_machine *sm,
  			      struct wpa_authenticator *wpa_auth,
  			      u8 *pmkid, u8 *pmk)
  {
  	if (!sm)
  		return;
  
  	sm->pmksa = pmksa;
  	os_memcpy(pmk, pmksa->pmk, PMK_LEN);
  	os_memcpy(pmkid, pmksa->pmkid, PMKID_LEN);
  	os_memcpy(wpa_auth->dot11RSNAPMKIDUsed, pmksa->pmkid, PMKID_LEN);
  }
  
  
  /*
   * Remove and free the group from wpa_authenticator. This is triggered by a
   * callback to make sure nobody is currently iterating the group list while it
   * gets modified.
   */
  static void wpa_group_free(struct wpa_authenticator *wpa_auth,
  			   struct wpa_group *group)
  {
  	struct wpa_group *prev = wpa_auth->group;
  
  	wpa_printf(MSG_DEBUG, "WPA: Remove group state machine for VLAN-ID %d",
  		   group->vlan_id);
  
  	while (prev) {
  		if (prev->next == group) {
  			/* This never frees the special first group as needed */
  			prev->next = group->next;
  			os_free(group);
  			break;
  		}
  		prev = prev->next;
  	}
  
  }
  
  
  /* Increase the reference counter for group */
  static void wpa_group_get(struct wpa_authenticator *wpa_auth,
  			  struct wpa_group *group)
  {
  	/* Skip the special first group */
  	if (wpa_auth->group == group)
  		return;
  
  	group->references++;
  }
  
  
  /* Decrease the reference counter and maybe free the group */
  static void wpa_group_put(struct wpa_authenticator *wpa_auth,
  			  struct wpa_group *group)
  {
  	/* Skip the special first group */
  	if (wpa_auth->group == group)
  		return;
  
  	group->references--;
  	if (group->references)
  		return;
  	wpa_group_free(wpa_auth, group);
  }
  
  
  /*
   * Add a group that has its references counter set to zero. Caller needs to
   * call wpa_group_get() on the return value to mark the entry in use.
   */
  static struct wpa_group *
  wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
  {
  	struct wpa_group *group;
  
  	if (wpa_auth == NULL || wpa_auth->group == NULL)
  		return NULL;
  
  	wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
  		   vlan_id);
  	group = wpa_group_init(wpa_auth, vlan_id, 0);
  	if (group == NULL)
  		return NULL;
  
  	group->next = wpa_auth->group->next;
  	wpa_auth->group->next = group;
  
  	return group;
  }
  
  
  /*
   * Enforce that the group state machine for the VLAN is running, increase
   * reference counter as interface is up. References might have been increased
   * even if a negative value is returned.
   * Returns: -1 on error (group missing, group already failed); otherwise, 0
   */
  int wpa_auth_ensure_group(struct wpa_authenticator *wpa_auth, int vlan_id)
  {
  	struct wpa_group *group;
  
  	if (wpa_auth == NULL)
  		return 0;
  
  	group = wpa_auth->group;
  	while (group) {
  		if (group->vlan_id == vlan_id)
  			break;
  		group = group->next;
  	}
  
  	if (group == NULL) {
  		group = wpa_auth_add_group(wpa_auth, vlan_id);
  		if (group == NULL)
  			return -1;
  	}
  
  	wpa_printf(MSG_DEBUG,
  		   "WPA: Ensure group state machine running for VLAN ID %d",
  		   vlan_id);
  
  	wpa_group_get(wpa_auth, group);
  	group->num_setup_iface++;
  
  	if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
  		return -1;
  
  	return 0;
  }
  
  
  /*
   * Decrease reference counter, expected to be zero afterwards.
   * returns: -1 on error (group not found, group in fail state)
   *          -2 if wpa_group is still referenced
   *           0 else
   */
  int wpa_auth_release_group(struct wpa_authenticator *wpa_auth, int vlan_id)
  {
  	struct wpa_group *group;
  	int ret = 0;
  
  	if (wpa_auth == NULL)
  		return 0;
  
  	group = wpa_auth->group;
  	while (group) {
  		if (group->vlan_id == vlan_id)
  			break;
  		group = group->next;
  	}
  
  	if (group == NULL)
  		return -1;
  
  	wpa_printf(MSG_DEBUG,
  		   "WPA: Try stopping group state machine for VLAN ID %d",
  		   vlan_id);
  
  	if (group->num_setup_iface <= 0) {
  		wpa_printf(MSG_ERROR,
  			   "WPA: wpa_auth_release_group called more often than wpa_auth_ensure_group for VLAN ID %d, skipping.",
  			   vlan_id);
  		return -1;
  	}
  	group->num_setup_iface--;
  
  	if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
  		ret = -1;
  
  	if (group->references > 1) {
  		wpa_printf(MSG_DEBUG,
  			   "WPA: Cannot stop group state machine for VLAN ID %d as references are still hold",
  			   vlan_id);
  		ret = -2;
  	}
  
  	wpa_group_put(wpa_auth, group);
  
  	return ret;
  }
  
  
  int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
  {
  	struct wpa_group *group;
  
  	if (sm == NULL || sm->wpa_auth == NULL)
  		return 0;
  
  	group = sm->wpa_auth->group;
  	while (group) {
  		if (group->vlan_id == vlan_id)
  			break;
  		group = group->next;
  	}
  
  	if (group == NULL) {
  		group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
  		if (group == NULL)
  			return -1;
  	}
  
  	if (sm->group == group)
  		return 0;
  
  	if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
  		return -1;
  
  	wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
  		   "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
  
  	wpa_group_get(sm->wpa_auth, group);
  	wpa_group_put(sm->wpa_auth, sm->group);
  	sm->group = group;
  
  	return 0;
  }
  
  
  void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
  				  struct wpa_state_machine *sm, int ack)
  {
  	if (wpa_auth == NULL || sm == NULL)
  		return;
  	wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
  		   " ack=%d", MAC2STR(sm->addr), ack);
  	if (sm->pending_1_of_4_timeout && ack) {
  		/*
  		 * Some deployed supplicant implementations update their SNonce
  		 * for each EAPOL-Key 2/4 message even within the same 4-way
  		 * handshake and then fail to use the first SNonce when
  		 * deriving the PTK. This results in unsuccessful 4-way
  		 * handshake whenever the relatively short initial timeout is
  		 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
  		 * around this by increasing the timeout now that we know that
  		 * the station has received the frame.
  		 */
  		int timeout_ms = eapol_key_timeout_subseq;
  		wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
  			   "timeout by %u ms because of acknowledged frame",
  			   timeout_ms);
  		eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
  		eloop_register_timeout(timeout_ms / 1000,
  				       (timeout_ms % 1000) * 1000,
  				       wpa_send_eapol_timeout, wpa_auth, sm);
  	}
  }
  
  
  int wpa_auth_uses_sae(struct wpa_state_machine *sm)
  {
  	if (sm == NULL)
  		return 0;
  	return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
  }
  
  
  int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
  {
  	if (sm == NULL)
  		return 0;
  	return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
  }
  
  
  #ifdef CONFIG_P2P
  int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
  {
  	if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
  		return -1;
  	os_memcpy(addr, sm->ip_addr, 4);
  	return 0;
  }
  #endif /* CONFIG_P2P */
  
  
  int wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator *wpa_auth,
  					 struct radius_das_attrs *attr)
  {
  	return pmksa_cache_auth_radius_das_disconnect(wpa_auth->pmksa, attr);
  }
  
  
  void wpa_auth_reconfig_group_keys(struct wpa_authenticator *wpa_auth)
  {
  	struct wpa_group *group;
  
  	if (!wpa_auth)
  		return;
  	for (group = wpa_auth->group; group; group = group->next)
  		wpa_group_config_group_keys(wpa_auth, group);
  }
  