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/*

 * Copyright (c) 2008 Lukas Mejdrech

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup net

 * @{

 */

/** @file

 */

#include <async.h>

#include <errno.h>

#include <stdio.h>

#include <ipc/ipc.h>

#include <ipc/services.h>

#include "../err.h"

#include "../measured_strings.h"

#include "../messages.h"

#include "../modules.h"

#include "../packet.h"

#include "netif.h"

#define DEFAULT_MTU 1500

#define NAME    "lo - loopback interface"

netif_globals_t netif_globals;

int change_state_message( device_id_t device_id, device_state_t state );

int create( device_id_t device_id, device_ref * device );

int initialize( void );

void    netif_print_name( void );

int probe_auto_message( void );

int probe_message( device_id_t device_id, int irq, int io );

int send_message( device_id_t device_id, packet_t packet );

int start_message( device_id_t device_id );

int stop_message( device_id_t device_id );

int change_state_message( device_id_t device_id, device_state_t state ){

    ERROR_DECLARE;

    device_ref  device;

    ERROR_PROPAGATE( find_device( device_id, & device ));

    if( device->state != state ){

        device->state = state;

        nil_message( device, NET_NIL_DEVICE_STATE, device->state, NULL, NULL, NULL, NULL );

    }

    return EOK;

}

int create( device_id_t device_id, device_ref * device ){

    ERROR_DECLARE;

    if( device_map_count( & netif_globals.device_map ) > 0 ){

        return EXDEV;

    }else{

        * device = ( device_ref ) malloc( sizeof( device_t ));

        if( !( * device )) return ENOMEM;

        ( ** device ).device_id = device_id;

        ( ** device ).nil_phone = -1;

        ( ** device ).specific = NULL;

        null_device_stats( &(( ** device ).stats ));

        ( ** device ).state = NETIF_STOPPED;

        ( ** device ).flags = NULL;

        ( ** device ).mtu = DEFAULT_MTU;

        if( ERROR_OCCURED( device_map_add( & netif_globals.device_map, ( ** device ).device_id, * device ))){

            free( * device );

            * device = NULL;

            return ERROR_CODE;

        }

    }

    return EOK;

}

int initialize( void ){

    ipcarg_t    phonehash;

    return REGISTER_ME( SERVICE_LO, & phonehash );

}

void netif_print_name( void ){

    printf( NAME );

}

int probe_auto_message( void ){

/*  ERROR_DECLARE;

    device_ref  device;

    ERROR_PROPAGATE( create( arg1, & device ));

    ipc_call_sync_3_3( netif_globals.networking_phone, NET_NET_DEVICE, device->device_id, NULL, NULL, NULL, NULL, NULL );

*/  return ENOTSUP;

}

int probe_message( device_id_t device_id, int irq, int io ){

    ERROR_DECLARE;

    device_ref      device;

    aid_t           message;

    ipc_call_t      answer;

    measured_string_t   configuration[ 1 ] = {{ "MTU", 3 }};

    int         count = 1;

    measured_string_ref settings;

    char *          data;

    // create a new device

    ERROR_PROPAGATE( create( device_id, & device ));

    // get configuration

    message = async_send_2( netif_globals.networking_phone, NET_NET_GET_DEVICE_CONF, device->device_id, count, & answer );

    // send names and get settings

    if( ERROR_OCCURED( measured_strings_send( netif_globals.networking_phone, configuration, count ))

    || ERROR_OCCURED( measured_strings_return( netif_globals.networking_phone, & settings, & data, count ))){

        async_wait_for( message, NULL );

        return ERROR_CODE;

    }

    // MTU is the first one

    if( settings && ( settings[ 0 ].value )){

        device->mtu = strtoul( settings[ 0 ].value, NULL, 0 );

    }else{

        device->mtu = DEFAULT_MTU;

    }

    // print the settings

    printf("\n -MTU =\t%d", device->mtu );

    free( settings );

    free( data );

    // end request

    async_wait_for( message, NULL );

    return EOK;

}

int send_message( device_id_t device_id, packet_t packet ){

    ERROR_DECLARE;

    device_ref  device;

    size_t      length;

    aid_t       message;

    ipc_call_t  answer;

    ipcarg_t    result;

    packet_t    received;

    ERROR_PROPAGATE( find_device( device_id, & device ));

    if( device->state != NETIF_ACTIVE ) return EPERM;

    ++ device->stats.tx_packets;

    ++ device->stats.rx_packets;

    length = packet_get_data_length( packet );

    device->stats.tx_bytes += length;

    device->stats.rx_bytes += length;

    received = packet_copy( packet );

    packet_destroy( packet );

    if( ! received ){

        ++ device->stats.rx_dropped;

        return EOK;

    }

    message = async_send_1( device->nil_phone, NET_NIL_RECEIVED, ( device_id ), & answer );

    if( ERROR_OCCURED( packet_send( received, device->nil_phone ))){

        ++ device->stats.rx_dropped;

    }

    async_wait_for( message, & result );

    if( result != EOK ) ++ device->stats.rx_dropped;

    return EOK;

}

int start_message( device_id_t device_id ){

    return change_state_message( device_id, NETIF_ACTIVE );

}

int stop_message( device_id_t device_id ){

    return change_state_message( device_id, NETIF_STOPPED );

}

/** @}

 */