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/** @addtogroup lo
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/** @addtogroup lo
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 *  @{
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 *  @{
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 */
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 */
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/** @file
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/** @file
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 *  Loopback network interface implementation.
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 */
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 */
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#include <async.h>
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#include <async.h>
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#include <errno.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdio.h>
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#include "../../include/net_interface.h"
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#include "../../include/net_interface.h"
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#include "../netif.h"
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#include "../netif.h"
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#include "../netif_module.h"
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#include "../netif_module.h"
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/** Default maximum transmission unit.
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 */
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#define DEFAULT_MTU 1500
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#define DEFAULT_MTU 1500
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/** Default hardware address.
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 */
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#define DEFAULT_ADDR        "\0\0\0\0\0\0"
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#define DEFAULT_ADDR        "\0\0\0\0\0\0"
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/** Default address length.
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 */
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#define DEFAULT_ADDR_LEN    ( sizeof( DEFAULT_ADDR ) / sizeof( char ))
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#define DEFAULT_ADDR_LEN    ( sizeof( DEFAULT_ADDR ) / sizeof( char ))
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/** Loopback module name.
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 */
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#define NAME    "lo - loopback interface"
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#define NAME    "lo - loopback interface"
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/** Network interface global data.
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 */
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netif_globals_t netif_globals;
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netif_globals_t netif_globals;
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/** Loopback module global data.
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 */
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static struct lo_globals{
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static struct lo_globals{
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    unsigned int mtu;
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    unsigned int mtu;
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} lo_globals;
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} lo_globals;
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/** Changes the loopback state.
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 *  @param device The device structure. Input parameter.
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 *  @param state The new device state. Input parameter.
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 *  @returns The new state if changed.
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 *  @returns EOK otherwise.
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 */
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static int  change_state_message( device_ref device, device_state_t state );
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int change_state_message( device_ref device, device_state_t state );
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/** Creates and returns the loopback network interface structure.
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 *  @param device_id The new devce identifier. Input parameter.
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 *  @param device The device structure. Output parameter.
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 *  @returns EOK on success.
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 *  @returns EXDEV if one loopback network interface already exists.
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 *  @returns ENOMEM if there is not enough memory left.
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 */
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static int  create( device_id_t device_id, device_ref * device );
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int create( device_id_t device_id, device_ref * device );
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/** Prints the module name.
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 *  @see NAME
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 */
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void    module_print_name( void );
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void    module_print_name( void );
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int netif_specific_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
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int netif_specific_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
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    //TODO nil send message
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    //TODO nil send message
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    return ENOTSUP;
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    return ENOTSUP;
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    ERROR_PROPAGATE( find_device( device_id, & device ));
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    ERROR_PROPAGATE( find_device( device_id, & device ));
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    memcpy( stats, ( device_stats_ref ) device->specific, sizeof( device_stats_t ));
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    memcpy( stats, ( device_stats_ref ) device->specific, sizeof( device_stats_t ));
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    return EOK;
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    return EOK;
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}
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}
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static int change_state_message( device_ref device, device_state_t state ){
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int change_state_message( device_ref device, device_state_t state ){
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    if( device->state != state ){
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    if( device->state != state ){
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        device->state = state;
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        device->state = state;
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        printf( "State changed to %s\n", ( state == NETIF_ACTIVE ) ? "ACTIVE" : "STOPPED" );
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        printf( "State changed to %s\n", ( state == NETIF_ACTIVE ) ? "ACTIVE" : "STOPPED" );
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        return state;
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        return state;
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    }
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    }
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    return EOK;
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    return EOK;
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}
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}
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static int create( device_id_t device_id, device_ref * device ){
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int create( device_id_t device_id, device_ref * device ){
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    int index;
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    int index;
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    if( device_map_count( & netif_globals.device_map ) > 0 ){
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    if( device_map_count( & netif_globals.device_map ) > 0 ){
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        return EXDEV;
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        return EXDEV;
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    }else{
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    }else{