Allow clients to request a configured EAP method via EAP-Nak

src/libcharon/encoding/payloads/eap_payload.h

@@ -127,10 +127,13 @@ eap_payload_t *eap_payload_create_code(eap_code_t code, u_int8_t identifier);
  * Creates an eap_payload_t EAP_RESPONSE containing an EAP_NAK.
  *
  * @param identifier	EAP identifier to use in payload
+ * @param type			preferred auth type, 0 to send all supported types
+ * @param vendor		vendor identifier for auth type, 0 for default
  * @param expanded		TRUE to send an expanded Nak (as response to an expanded
  * 						request, i.e. one with vendor specific type)
  * @return 				eap_payload_t object
  */
-eap_payload_t *eap_payload_create_nak(u_int8_t identifier, bool expanded);
+eap_payload_t *eap_payload_create_nak(u_int8_t identifier, eap_type_t type,
+									  u_int32_t vendor, bool expanded);
 
 #endif /** EAP_PAYLOAD_H_ @}*/