static void hostapd_acl_expire_queries(struct hostapd_data *hapd, time_t now)
{
	struct hostapd_acl_query_data *prev, *entry, *tmp;

	prev = NULL;
	entry = hapd->acl_queries;

	while (entry) {
		if (now - entry->timestamp > RADIUS_ACL_TIMEOUT) {
			wpa_printf(MSG_DEBUG, "ACL query for " MACSTR
				   " has expired.", MAC2STR(entry->addr));
			if (prev)
				prev->next = entry->next;
			else
				hapd->acl_queries = entry->next;

			tmp = entry;
			entry = entry->next;
			hostapd_acl_query_free(tmp);
			continue;
		}

		prev = entry;
		entry = entry->next;
	}
}
static void hostapd_acl_expire_queries(struct hostapd_data *hapd,
				       struct os_reltime *now)
{
	struct hostapd_acl_query_data *prev, *entry, *tmp;

	wpa_printf(MSG_INFO, "WGTT: %s %s():%d\n", __FILE__, __FUNCTION__, __LINE__);

	prev = NULL;
	entry = hapd->acl_queries;

	while (entry) {
		if (os_reltime_expired(now, &entry->timestamp,
				       RADIUS_ACL_TIMEOUT)) {
			wpa_printf(MSG_DEBUG, "ACL query for " MACSTR
				   " has expired.", MAC2STR(entry->addr));
			if (prev)
				prev->next = entry->next;
			else
				hapd->acl_queries = entry->next;

			tmp = entry;
			entry = entry->next;
			hostapd_acl_query_free(tmp);
			continue;
		}

		prev = entry;
		entry = entry->next;
	}
}
Example #3
0
void hostapd_acl_deinit(hostapd *hapd)
{
	struct hostapd_acl_query_data *query, *prev;

	hostapd_acl_cache_free(hapd->acl_cache);

	query = hapd->acl_queries;
	while (query) {
		prev = query;
		query = query->next;
		hostapd_acl_query_free(prev);
	}
}
void hostapd_acl_deinit(struct hostapd_data *hapd)
{
	struct hostapd_acl_query_data *query, *prev;

	eloop_cancel_timeout(hostapd_acl_expire, hapd, NULL);

	hostapd_acl_cache_free(hapd->acl_cache);

	query = hapd->acl_queries;
	while (query) {
		prev = query;
		query = query->next;
		hostapd_acl_query_free(prev);
	}
}
/**
 * hostapd_acl_deinit - Deinitialize IEEE 802.11 ACL
 * @hapd: hostapd BSS data
 */
void hostapd_acl_deinit(struct hostapd_data *hapd)
{
	struct hostapd_acl_query_data *query, *prev;

#ifndef CONFIG_NO_RADIUS
	eloop_cancel_timeout(hostapd_acl_expire, hapd, NULL);

	hostapd_acl_cache_free(hapd->acl_cache);
#endif /* CONFIG_NO_RADIUS */

	query = hapd->acl_queries;
	while (query) {
		prev = query;
		query = query->next;
		hostapd_acl_query_free(prev);
	}
}
/**
 * hostapd_acl_deinit - Deinitialize IEEE 802.11 ACL
 * @hapd: hostapd BSS data
 */
void hostapd_acl_deinit(struct hostapd_data *hapd)
{
	struct hostapd_acl_query_data *query, *prev;

#ifndef CONFIG_NO_RADIUS
	hostapd_acl_cache_free(hapd->acl_cache);
	hapd->acl_cache = NULL;
#endif /* CONFIG_NO_RADIUS */

	query = hapd->acl_queries;
	hapd->acl_queries = NULL;
	while (query) {
		prev = query;
		query = query->next;
		hostapd_acl_query_free(prev);
	}
}
/**
 * hostapd_acl_recv_radius - Process incoming RADIUS Authentication messages
 * @msg: RADIUS response message
 * @req: RADIUS request message
 * @shared_secret: RADIUS shared secret
 * @shared_secret_len: Length of shared_secret in octets
 * @data: Context data (struct hostapd_data *)
 * Returns: RADIUS_RX_PROCESSED if RADIUS message was a reply to ACL query (and
 * was processed here) or RADIUS_RX_UNKNOWN if not.
 */
static RadiusRxResult
hostapd_acl_recv_radius(struct radius_msg *msg, struct radius_msg *req,
			const u8 *shared_secret, size_t shared_secret_len,
			void *data)
{
	struct hostapd_data *hapd = data;
	struct hostapd_acl_query_data *query, *prev;
	struct hostapd_cached_radius_acl *cache;
	struct radius_hdr *hdr = radius_msg_get_hdr(msg);

	query = hapd->acl_queries;
	prev = NULL;
	while (query) {
		if (query->radius_id == hdr->identifier)
			break;
		prev = query;
		query = query->next;
	}
	if (query == NULL)
		return RADIUS_RX_UNKNOWN;

	wpa_printf(MSG_DEBUG, "Found matching Access-Request for RADIUS "
		   "message (id=%d)", query->radius_id);

	if (radius_msg_verify(msg, shared_secret, shared_secret_len, req, 0)) {
		wpa_printf(MSG_INFO, "Incoming RADIUS packet did not have "
			   "correct authenticator - dropped\n");
		return RADIUS_RX_INVALID_AUTHENTICATOR;
	}

	if (hdr->code != RADIUS_CODE_ACCESS_ACCEPT &&
	    hdr->code != RADIUS_CODE_ACCESS_REJECT) {
		wpa_printf(MSG_DEBUG, "Unknown RADIUS message code %d to ACL "
			   "query", hdr->code);
		return RADIUS_RX_UNKNOWN;
	}

	/* Insert Accept/Reject info into ACL cache */
	cache = os_zalloc(sizeof(*cache));
	if (cache == NULL) {
		wpa_printf(MSG_DEBUG, "Failed to add ACL cache entry");
		goto done;
	}
	time(&cache->timestamp);
	os_memcpy(cache->addr, query->addr, sizeof(cache->addr));
	if (hdr->code == RADIUS_CODE_ACCESS_ACCEPT) {
		if (radius_msg_get_attr_int32(msg, RADIUS_ATTR_SESSION_TIMEOUT,
					      &cache->session_timeout) == 0)
			cache->accepted = HOSTAPD_ACL_ACCEPT_TIMEOUT;
		else
			cache->accepted = HOSTAPD_ACL_ACCEPT;

		if (radius_msg_get_attr_int32(
			    msg, RADIUS_ATTR_ACCT_INTERIM_INTERVAL,
			    &cache->acct_interim_interval) == 0 &&
		    cache->acct_interim_interval < 60) {
			wpa_printf(MSG_DEBUG, "Ignored too small "
				   "Acct-Interim-Interval %d for STA " MACSTR,
				   cache->acct_interim_interval,
				   MAC2STR(query->addr));
			cache->acct_interim_interval = 0;
		}

		cache->vlan_id = radius_msg_get_vlanid(msg);
	} else
		cache->accepted = HOSTAPD_ACL_REJECT;
	cache->next = hapd->acl_cache;
	hapd->acl_cache = cache;

#ifdef CONFIG_DRIVER_RADIUS_ACL
	hapd->drv.set_radius_acl_auth(hapd, query->addr, cache->accepted,
				      cache->session_timeout);
#else /* CONFIG_DRIVER_RADIUS_ACL */
#ifdef NEED_AP_MLME
	/* Re-send original authentication frame for 802.11 processing */
	wpa_printf(MSG_DEBUG, "Re-sending authentication frame after "
		   "successful RADIUS ACL query");
	ieee802_11_mgmt(hapd, query->auth_msg, query->auth_msg_len, NULL);
#endif /* NEED_AP_MLME */
#endif /* CONFIG_DRIVER_RADIUS_ACL */

 done:
	if (prev == NULL)
		hapd->acl_queries = query->next;
	else
		prev->next = query->next;

	hostapd_acl_query_free(query);

	return RADIUS_RX_PROCESSED;
}
/**
 * hostapd_allowed_address - Check whether a specified STA can be authenticated
 * @hapd: hostapd BSS data
 * @addr: MAC address of the STA
 * @msg: Authentication message
 * @len: Length of msg in octets
 * @session_timeout: Buffer for returning session timeout (from RADIUS)
 * @acct_interim_interval: Buffer for returning account interval (from RADIUS)
 * @vlan_id: Buffer for returning VLAN ID
 * Returns: HOSTAPD_ACL_ACCEPT, HOSTAPD_ACL_REJECT, or HOSTAPD_ACL_PENDING
 */
int hostapd_allowed_address(struct hostapd_data *hapd, const u8 *addr,
			    const u8 *msg, size_t len, u32 *session_timeout,
			    u32 *acct_interim_interval, int *vlan_id)
{
	if (session_timeout)
		*session_timeout = 0;
	if (acct_interim_interval)
		*acct_interim_interval = 0;
	if (vlan_id)
		*vlan_id = 0;

	if (hostapd_maclist_found(hapd->conf->accept_mac,
				  hapd->conf->num_accept_mac, addr, vlan_id))
		return HOSTAPD_ACL_ACCEPT;

	if (hostapd_maclist_found(hapd->conf->deny_mac,
				  hapd->conf->num_deny_mac, addr, vlan_id))
		return HOSTAPD_ACL_REJECT;

	if (hapd->conf->macaddr_acl == ACCEPT_UNLESS_DENIED)
		return HOSTAPD_ACL_ACCEPT;
	if (hapd->conf->macaddr_acl == DENY_UNLESS_ACCEPTED)
		return HOSTAPD_ACL_REJECT;

	if (hapd->conf->macaddr_acl == USE_EXTERNAL_RADIUS_AUTH) {
#ifdef CONFIG_NO_RADIUS
		return HOSTAPD_ACL_REJECT;
#else /* CONFIG_NO_RADIUS */
		struct hostapd_acl_query_data *query;

		/* Check whether ACL cache has an entry for this station */
		int res = hostapd_acl_cache_get(hapd, addr, session_timeout,
						acct_interim_interval,
						vlan_id);
		if (res == HOSTAPD_ACL_ACCEPT ||
		    res == HOSTAPD_ACL_ACCEPT_TIMEOUT)
			return res;
		if (res == HOSTAPD_ACL_REJECT)
			return HOSTAPD_ACL_REJECT;

		query = hapd->acl_queries;
		while (query) {
			if (os_memcmp(query->addr, addr, ETH_ALEN) == 0) {
				/* pending query in RADIUS retransmit queue;
				 * do not generate a new one */
				return HOSTAPD_ACL_PENDING;
			}
			query = query->next;
		}

		if (!hapd->conf->radius->auth_server)
			return HOSTAPD_ACL_REJECT;

		/* No entry in the cache - query external RADIUS server */
		query = os_zalloc(sizeof(*query));
		if (query == NULL) {
			wpa_printf(MSG_ERROR, "malloc for query data failed");
			return HOSTAPD_ACL_REJECT;
		}
		time(&query->timestamp);
		os_memcpy(query->addr, addr, ETH_ALEN);
		if (hostapd_radius_acl_query(hapd, addr, query)) {
			wpa_printf(MSG_DEBUG, "Failed to send Access-Request "
				   "for ACL query.");
			hostapd_acl_query_free(query);
			return HOSTAPD_ACL_REJECT;
		}

		query->auth_msg = os_malloc(len);
		if (query->auth_msg == NULL) {
			wpa_printf(MSG_ERROR, "Failed to allocate memory for "
				   "auth frame.");
			hostapd_acl_query_free(query);
			return HOSTAPD_ACL_REJECT;
		}
		os_memcpy(query->auth_msg, msg, len);
		query->auth_msg_len = len;
		query->next = hapd->acl_queries;
		hapd->acl_queries = query;

		/* Queued data will be processed in hostapd_acl_recv_radius()
		 * when RADIUS server replies to the sent Access-Request. */
		return HOSTAPD_ACL_PENDING;
#endif /* CONFIG_NO_RADIUS */
	}

	return HOSTAPD_ACL_REJECT;
}
/* Return 0 if RADIUS message was a reply to ACL query (and was processed here)
 * or -1 if not. */
static RadiusRxResult
hostapd_acl_recv_radius(struct radius_msg *msg, struct radius_msg *req,
			u8 *shared_secret, size_t shared_secret_len,
			void *data)
{
	struct hostapd_data *hapd = data;
	struct hostapd_acl_query_data *query, *prev;
	struct hostapd_cached_radius_acl *cache;

	query = hapd->acl_queries;
	prev = NULL;
	while (query) {
		if (query->radius_id == msg->hdr->identifier)
			break;
		prev = query;
		query = query->next;
	}
	if (query == NULL)
		return RADIUS_RX_UNKNOWN;

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Found matching Access-Request "
		      "for RADIUS message (id=%d)\n", query->radius_id);

	if (radius_msg_verify(msg, shared_secret, shared_secret_len, req, 0)) {
		printf("Incoming RADIUS packet did not have correct "
		       "authenticator - dropped\n");
		return RADIUS_RX_INVALID_AUTHENTICATOR;
	}

	if (msg->hdr->code != RADIUS_CODE_ACCESS_ACCEPT &&
	    msg->hdr->code != RADIUS_CODE_ACCESS_REJECT) {
		printf("Unknown RADIUS message code %d to ACL query\n",
		       msg->hdr->code);
		return RADIUS_RX_UNKNOWN;
	}

	/* Insert Accept/Reject info into ACL cache */
	cache = wpa_zalloc(sizeof(*cache));
	if (cache == NULL) {
		printf("Failed to add ACL cache entry\n");
		goto done;
	}
	time(&cache->timestamp);
	memcpy(cache->addr, query->addr, sizeof(cache->addr));
	if (msg->hdr->code == RADIUS_CODE_ACCESS_ACCEPT) {
		if (radius_msg_get_attr_int32(msg, RADIUS_ATTR_SESSION_TIMEOUT,
					      &cache->session_timeout) == 0)
			cache->accepted = HOSTAPD_ACL_ACCEPT_TIMEOUT;
		else
			cache->accepted = HOSTAPD_ACL_ACCEPT;

		if (radius_msg_get_attr_int32(
			    msg, RADIUS_ATTR_ACCT_INTERIM_INTERVAL,
			    &cache->acct_interim_interval) == 0 &&
		    cache->acct_interim_interval < 60) {
			HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Ignored too "
				      "small Acct-Interim-Interval %d for "
				      "STA " MACSTR "\n",
				      cache->acct_interim_interval,
				      MAC2STR(query->addr));
			cache->acct_interim_interval = 0;
		}

		cache->vlan_id = radius_msg_get_vlanid(msg);
	} else
		cache->accepted = HOSTAPD_ACL_REJECT;
	cache->next = hapd->acl_cache;
	hapd->acl_cache = cache;

	/* Re-send original authentication frame for 802.11 processing */
	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Re-sending authentication frame "
		      "after successful RADIUS ACL query\n");
	ieee802_11_mgmt(hapd, query->auth_msg, query->auth_msg_len,
			WLAN_FC_STYPE_AUTH, NULL);

 done:
	if (prev == NULL)
		hapd->acl_queries = query->next;
	else
		prev->next = query->next;

	hostapd_acl_query_free(query);

	return RADIUS_RX_PROCESSED;
}
Example #10
0
int hostapd_allowed_address(hostapd *hapd, u8 *addr, u8 *msg, size_t len,
			    u32 *session_timeout, u32 *acct_interim_interval)
{
	*session_timeout = 0;
	*acct_interim_interval = 0;

	if (hostapd_maclist_found(hapd->conf->accept_mac,
				  hapd->conf->num_accept_mac, addr))
		return HOSTAPD_ACL_ACCEPT;

	if (hostapd_maclist_found(hapd->conf->deny_mac,
				  hapd->conf->num_deny_mac, addr))
		return HOSTAPD_ACL_REJECT;

	if (hapd->conf->macaddr_acl == ACCEPT_UNLESS_DENIED)
		return HOSTAPD_ACL_ACCEPT;
	if (hapd->conf->macaddr_acl == DENY_UNLESS_ACCEPTED)
		return HOSTAPD_ACL_REJECT;

	if (hapd->conf->macaddr_acl == USE_EXTERNAL_RADIUS_AUTH) {
		struct hostapd_acl_query_data *query;

		/* Check whether ACL cache has an entry for this station */
		int res = hostapd_acl_cache_get(hapd, addr, session_timeout,
						acct_interim_interval);
		if (res == HOSTAPD_ACL_ACCEPT ||
		    res == HOSTAPD_ACL_ACCEPT_TIMEOUT)
			return res;
		if (res == HOSTAPD_ACL_REJECT)
			return HOSTAPD_ACL_REJECT;

		query = hapd->acl_queries;
		while (query) {
			if (memcmp(query->addr, addr, ETH_ALEN) == 0) {
				/* pending query in RADIUS retransmit queue;
				 * do not generate a new one */
				return HOSTAPD_ACL_PENDING;
			}
			query = query->next;
		}

		if (!hapd->conf->auth_server)
			return HOSTAPD_ACL_REJECT;

		/* No entry in the cache - query external RADIUS server */
		query = malloc(sizeof(*query));
		if (query == NULL) {
			printf("malloc for query data failed\n");
			return HOSTAPD_ACL_REJECT;
		}
		memset(query, 0, sizeof(*query));
		time(&query->timestamp);
		memcpy(query->addr, addr, ETH_ALEN);
		if (hostapd_radius_acl_query(hapd, addr, query)) {
			printf("Failed to send Access-Request for ACL "
			       "query.\n");
			hostapd_acl_query_free(query);
			return HOSTAPD_ACL_REJECT;
		}

		query->auth_msg = malloc(len);
		if (query->auth_msg == NULL) {
			printf("Failed to allocate memory for auth frame.\n");
			hostapd_acl_query_free(query);
			return HOSTAPD_ACL_REJECT;
		}
		memcpy(query->auth_msg, msg, len);
		query->auth_msg_len = len;
		query->next = hapd->acl_queries;
		hapd->acl_queries = query;

		/* Queued data will be processed in hostapd_acl_recv_radius()
		 * when RADIUS server replies to the sent Access-Request. */
		return HOSTAPD_ACL_PENDING;
	}

	return HOSTAPD_ACL_REJECT;
}
/**
 * hostapd_acl_recv_radius - Process incoming RADIUS Authentication messages
 * @msg: RADIUS response message
 * @req: RADIUS request message
 * @shared_secret: RADIUS shared secret
 * @shared_secret_len: Length of shared_secret in octets
 * @data: Context data (struct hostapd_data *)
 * Returns: RADIUS_RX_PROCESSED if RADIUS message was a reply to ACL query (and
 * was processed here) or RADIUS_RX_UNKNOWN if not.
 */
static RadiusRxResult
hostapd_acl_recv_radius(struct radius_msg *msg, struct radius_msg *req,
			const u8 *shared_secret, size_t shared_secret_len,
			void *data)
{
	struct hostapd_data *hapd = data;
	struct hostapd_acl_query_data *query, *prev;
	struct hostapd_cached_radius_acl *cache;
	struct radius_hdr *hdr = radius_msg_get_hdr(msg);

	query = hapd->acl_queries;
	prev = NULL;
	while (query) {
		if (query->radius_id == hdr->identifier)
			break;
		prev = query;
		query = query->next;
	}
	if (query == NULL)
		return RADIUS_RX_UNKNOWN;

	wpa_printf(MSG_DEBUG, "Found matching Access-Request for RADIUS "
		   "message (id=%d)", query->radius_id);

	if (radius_msg_verify(msg, shared_secret, shared_secret_len, req, 0)) {
		wpa_printf(MSG_INFO, "Incoming RADIUS packet did not have "
			   "correct authenticator - dropped\n");
		return RADIUS_RX_INVALID_AUTHENTICATOR;
	}

	if (hdr->code != RADIUS_CODE_ACCESS_ACCEPT &&
	    hdr->code != RADIUS_CODE_ACCESS_REJECT) {
		wpa_printf(MSG_DEBUG, "Unknown RADIUS message code %d to ACL "
			   "query", hdr->code);
		return RADIUS_RX_UNKNOWN;
	}

	/* Insert Accept/Reject info into ACL cache */
	cache = os_zalloc(sizeof(*cache));
	if (cache == NULL) {
		wpa_printf(MSG_DEBUG, "Failed to add ACL cache entry");
		goto done;
	}
	os_get_reltime(&cache->timestamp);
	os_memcpy(cache->addr, query->addr, sizeof(cache->addr));
	if (hdr->code == RADIUS_CODE_ACCESS_ACCEPT) {
		u8 *buf;
		size_t len;

		if (radius_msg_get_attr_int32(msg, RADIUS_ATTR_SESSION_TIMEOUT,
					      &cache->session_timeout) == 0)
			cache->accepted = HOSTAPD_ACL_ACCEPT_TIMEOUT;
		else
			cache->accepted = HOSTAPD_ACL_ACCEPT;

		if (radius_msg_get_attr_int32(
			    msg, RADIUS_ATTR_ACCT_INTERIM_INTERVAL,
			    &cache->acct_interim_interval) == 0 &&
		    cache->acct_interim_interval < 60) {
			wpa_printf(MSG_DEBUG, "Ignored too small "
				   "Acct-Interim-Interval %d for STA " MACSTR,
				   cache->acct_interim_interval,
				   MAC2STR(query->addr));
			cache->acct_interim_interval = 0;
		}

		if (hapd->conf->ssid.dynamic_vlan != DYNAMIC_VLAN_DISABLED)
			cache->vlan_id.notempty = !!radius_msg_get_vlanid(
				msg, &cache->vlan_id.untagged,
				MAX_NUM_TAGGED_VLAN, cache->vlan_id.tagged);

		decode_tunnel_passwords(hapd, shared_secret, shared_secret_len,
					msg, req, cache);

		if (radius_msg_get_attr_ptr(msg, RADIUS_ATTR_USER_NAME,
					    &buf, &len, NULL) == 0) {
			cache->identity = os_zalloc(len + 1);
			if (cache->identity)
				os_memcpy(cache->identity, buf, len);
		}
		if (radius_msg_get_attr_ptr(
			    msg, RADIUS_ATTR_CHARGEABLE_USER_IDENTITY,
			    &buf, &len, NULL) == 0) {
			cache->radius_cui = os_zalloc(len + 1);
			if (cache->radius_cui)
				os_memcpy(cache->radius_cui, buf, len);
		}

		if (hapd->conf->wpa_psk_radius == PSK_RADIUS_REQUIRED &&
		    !cache->psk)
			cache->accepted = HOSTAPD_ACL_REJECT;

		if (cache->vlan_id.notempty &&
		    !hostapd_vlan_valid(hapd->conf->vlan, &cache->vlan_id)) {
			hostapd_logger(hapd, query->addr,
				       HOSTAPD_MODULE_RADIUS,
				       HOSTAPD_LEVEL_INFO,
				       "Invalid VLAN %d%s received from RADIUS server",
				       cache->vlan_id.untagged,
				       cache->vlan_id.tagged[0] ? "+" : "");
			os_memset(&cache->vlan_id, 0, sizeof(cache->vlan_id));
		}
		if (hapd->conf->ssid.dynamic_vlan == DYNAMIC_VLAN_REQUIRED &&
		    !cache->vlan_id.notempty)
			cache->accepted = HOSTAPD_ACL_REJECT;
	} else
		cache->accepted = HOSTAPD_ACL_REJECT;
	cache->next = hapd->acl_cache;
	hapd->acl_cache = cache;

#ifdef CONFIG_DRIVER_RADIUS_ACL
	hostapd_drv_set_radius_acl_auth(hapd, query->addr, cache->accepted,
					cache->session_timeout);
#else /* CONFIG_DRIVER_RADIUS_ACL */
#ifdef NEED_AP_MLME
	/* Re-send original authentication frame for 802.11 processing */
	wpa_printf(MSG_DEBUG, "Re-sending authentication frame after "
		   "successful RADIUS ACL query");
	ieee802_11_mgmt(hapd, query->auth_msg, query->auth_msg_len, NULL);
#endif /* NEED_AP_MLME */
#endif /* CONFIG_DRIVER_RADIUS_ACL */

 done:
	if (prev == NULL)
		hapd->acl_queries = query->next;
	else
		prev->next = query->next;

	hostapd_acl_query_free(query);

	return RADIUS_RX_PROCESSED;
}
/**
 * hostapd_allowed_address - Check whether a specified STA can be authenticated
 * @hapd: hostapd BSS data
 * @addr: MAC address of the STA
 * @msg: Authentication message
 * @len: Length of msg in octets
 * @session_timeout: Buffer for returning session timeout (from RADIUS)
 * @acct_interim_interval: Buffer for returning account interval (from RADIUS)
 * @vlan_id: Buffer for returning VLAN ID
 * @psk: Linked list buffer for returning WPA PSK
 * @identity: Buffer for returning identity (from RADIUS)
 * @radius_cui: Buffer for returning CUI (from RADIUS)
 * @is_probe_req: Whether this query for a Probe Request frame
 * Returns: HOSTAPD_ACL_ACCEPT, HOSTAPD_ACL_REJECT, or HOSTAPD_ACL_PENDING
 *
 * The caller is responsible for freeing the returned *identity and *radius_cui
 * values with os_free().
 */
int hostapd_allowed_address(struct hostapd_data *hapd, const u8 *addr,
			    const u8 *msg, size_t len, u32 *session_timeout,
			    u32 *acct_interim_interval,
			    struct vlan_description *vlan_id,
			    struct hostapd_sta_wpa_psk_short **psk,
			    char **identity, char **radius_cui,
			    int is_probe_req)
{
	int res;

	if (session_timeout)
		*session_timeout = 0;
	if (acct_interim_interval)
		*acct_interim_interval = 0;
	if (vlan_id)
		os_memset(vlan_id, 0, sizeof(*vlan_id));
	if (psk)
		*psk = NULL;
	if (identity)
		*identity = NULL;
	if (radius_cui)
		*radius_cui = NULL;

	res = hostapd_check_acl(hapd, addr, vlan_id);
	if (res != HOSTAPD_ACL_PENDING)
		return res;

	if (hapd->conf->macaddr_acl == USE_EXTERNAL_RADIUS_AUTH) {
#ifdef CONFIG_NO_RADIUS
		return HOSTAPD_ACL_REJECT;
#else /* CONFIG_NO_RADIUS */
		struct hostapd_acl_query_data *query;

		if (is_probe_req) {
			/* Skip RADIUS queries for Probe Request frames to avoid
			 * excessive load on the authentication server. */
			return HOSTAPD_ACL_ACCEPT;
		};

		if (hapd->conf->ssid.dynamic_vlan == DYNAMIC_VLAN_DISABLED)
			vlan_id = NULL;

		/* Check whether ACL cache has an entry for this station */
		res = hostapd_acl_cache_get(hapd, addr, session_timeout,
					    acct_interim_interval, vlan_id, psk,
					    identity, radius_cui);
		if (res == HOSTAPD_ACL_ACCEPT ||
		    res == HOSTAPD_ACL_ACCEPT_TIMEOUT)
			return res;
		if (res == HOSTAPD_ACL_REJECT)
			return HOSTAPD_ACL_REJECT;

		query = hapd->acl_queries;
		while (query) {
			if (os_memcmp(query->addr, addr, ETH_ALEN) == 0) {
				/* pending query in RADIUS retransmit queue;
				 * do not generate a new one */
				if (identity) {
					os_free(*identity);
					*identity = NULL;
				}
				if (radius_cui) {
					os_free(*radius_cui);
					*radius_cui = NULL;
				}
				return HOSTAPD_ACL_PENDING;
			}
			query = query->next;
		}

		if (!hapd->conf->radius->auth_server)
			return HOSTAPD_ACL_REJECT;

		/* No entry in the cache - query external RADIUS server */
		query = os_zalloc(sizeof(*query));
		if (query == NULL) {
			wpa_printf(MSG_ERROR, "malloc for query data failed");
			return HOSTAPD_ACL_REJECT;
		}
		os_get_reltime(&query->timestamp);
		os_memcpy(query->addr, addr, ETH_ALEN);
		if (hostapd_radius_acl_query(hapd, addr, query)) {
			wpa_printf(MSG_DEBUG, "Failed to send Access-Request "
				   "for ACL query.");
			hostapd_acl_query_free(query);
			return HOSTAPD_ACL_REJECT;
		}

		query->auth_msg = os_memdup(msg, len);
		if (query->auth_msg == NULL) {
			wpa_printf(MSG_ERROR, "Failed to allocate memory for "
				   "auth frame.");
			hostapd_acl_query_free(query);
			return HOSTAPD_ACL_REJECT;
		}
		query->auth_msg_len = len;
		query->next = hapd->acl_queries;
		hapd->acl_queries = query;

		/* Queued data will be processed in hostapd_acl_recv_radius()
		 * when RADIUS server replies to the sent Access-Request. */
		return HOSTAPD_ACL_PENDING;
#endif /* CONFIG_NO_RADIUS */
	}

	return HOSTAPD_ACL_REJECT;
}