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/*
 * Copyright (c) 2009 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 netif
 *  @{
 */

/** @file
 *  Network interface module skeleton implementation.
 *  @see netif.h
 */

#include <async.h>
#include <mem.h>
#include <fibril_sync.h>
#include <stdio.h>

#include <ipc/ipc.h>
#include <ipc/services.h>

#include "../err.h"
#include "../messages.h"
#include "../modules.h"

#include "../structures/packet/packet.h"
#include "../structures/packet/packet_client.h"
#include "../structures/measured_strings.h"

#include "../include/device.h"
#include "../include/netif_interface.h"
#include "../include/nil_interface.h"

#include "netif.h"
#include "netif_messages.h"
#include "netif_module.h"

/** Network interface module global data.
 */
extern netif_globals_t netif_globals;

DEVICE_MAP_IMPLEMENT( device_map, device_t )

/** @name Message processing functions
 */
/*@{*/

/** Registers the device notification receiver, the network interface layer module.
 *  @param device_id The device identifier. Input parameter.
 *  @param phone The network interface layer module phone. Input parameter.
 *  @returns EOK on success.
 *  @returns ENOENT if there is no such device.
 *  @returns ELIMIT if there is another module registered.
 */
int register_message( device_id_t device_id, int phone );

/*@}*/

int netif_probe_req( int netif_phone, device_id_t device_id, int irq, int io ){
    int result;

    fibril_rwlock_write_lock( & netif_globals.lock );
    result = netif_probe_message( device_id, irq, io );
    fibril_rwlock_write_unlock( & netif_globals.lock );
    return result;
}

int netif_send_msg( int netif_phone, device_id_t device_id, packet_t packet, services_t sender ){
    int result;

    fibril_rwlock_write_lock( & netif_globals.lock );
    result = netif_send_message( device_id, packet, sender );
    fibril_rwlock_write_unlock( & netif_globals.lock );
    return result;
}

int netif_start_req( int netif_phone, device_id_t device_id ){
    ERROR_DECLARE;

    device_ref  device;
    int result;
    int phone;

    fibril_rwlock_write_lock( & netif_globals.lock );
    if( ERROR_OCCURRED( find_device( device_id, & device ))){
        fibril_rwlock_write_unlock( & netif_globals.lock );
        return ERROR_CODE;
    }
    result = netif_start_message( device );
    if( result > NETIF_NULL ){
        phone = device->nil_phone;
        fibril_rwlock_write_unlock( & netif_globals.lock );
        nil_device_state_msg( phone, device_id, result );
        return EOK;
    }else{
        fibril_rwlock_write_unlock( & netif_globals.lock );
    }
    return result;
}

int netif_stop_req( int netif_phone, device_id_t device_id ){
    ERROR_DECLARE;

    device_ref  device;
    int result;
    int phone;

    fibril_rwlock_write_lock( & netif_globals.lock );
    if( ERROR_OCCURRED( find_device( device_id, & device ))){
        fibril_rwlock_write_unlock( & netif_globals.lock );
        return ERROR_CODE;
    }
    result = netif_stop_message( device );
    if( result > NETIF_NULL ){
        phone = device->nil_phone;
        fibril_rwlock_write_unlock( & netif_globals.lock );
        nil_device_state_msg( phone, device_id, result );
        return EOK;
    }else{
        fibril_rwlock_write_unlock( & netif_globals.lock );
    }
    return result;
}

int netif_stats_req( int netif_phone, device_id_t device_id, device_stats_ref stats ){
    int res;

    fibril_rwlock_read_lock( & netif_globals.lock );
    res = netif_get_device_stats( device_id, stats );
    fibril_rwlock_read_unlock( & netif_globals.lock );
    return res;
}

int netif_get_addr( int netif_phone, device_id_t device_id, measured_string_ref * address, char ** data ){
    ERROR_DECLARE;

    measured_string_t   translation;

    if( !( address && data )) return EBADMEM;
    fibril_rwlock_read_lock( & netif_globals.lock );
    if( ! ERROR_OCCURRED( netif_get_addr_message( device_id, & translation ))){
        * address = measured_string_copy( & translation );
        ERROR_CODE = ( * address ) ? EOK : ENOMEM;
    }
    fibril_rwlock_read_unlock( & netif_globals.lock );
    * data = ( ** address ).value;
    return ERROR_CODE;
}

int netif_bind_service( services_t service, device_id_t device_id, services_t me, async_client_conn_t receiver ){
    return EOK;
}

int find_device( device_id_t device_id, device_ref * device ){
    if( ! device ) return EBADMEM;
    * device = device_map_find( & netif_globals.device_map, device_id );
    if( ! * device ) return ENOENT;
    if(( ** device ).state == NETIF_NULL ) return EPERM;
    return EOK;
}

void null_device_stats( device_stats_ref stats ){
    bzero( stats, sizeof( device_stats_t ));
}

int register_message( device_id_t device_id, int phone ){
    ERROR_DECLARE;

    device_ref  device;

    ERROR_PROPAGATE( find_device( device_id, & device ));
    if( device->nil_phone > 0 ) return ELIMIT;
    device->nil_phone = phone;
    printf( "New receiver of the device %d registered:\n\tphone\t= %d\n", device->device_id, device->nil_phone );
    return EOK;
}

int netif_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
    ERROR_DECLARE;

    size_t              length;
    device_stats_t      stats;
    packet_t            packet;
    measured_string_t   address;

//  printf( "message %d - %d\n", IPC_GET_METHOD( * call ), NET_NETIF_FIRST );
    * answer_count = 0;
    switch( IPC_GET_METHOD( * call )){
        case IPC_M_PHONE_HUNGUP:
            return EOK;
        case NET_NETIF_PROBE:
            return netif_probe_req( 0, IPC_GET_DEVICE( call ), NETIF_GET_IRQ( call ), NETIF_GET_IO( call ));
        case IPC_M_CONNECT_TO_ME:
            fibril_rwlock_write_lock( & netif_globals.lock );
            ERROR_CODE = register_message( IPC_GET_DEVICE( call ), IPC_GET_PHONE( call ));
            fibril_rwlock_write_unlock( & netif_globals.lock );
            return ERROR_CODE;
        case NET_NETIF_SEND:
            ERROR_PROPAGATE( packet_translate( netif_globals.net_phone, & packet, IPC_GET_PACKET( call )));
            return netif_send_msg( 0, IPC_GET_DEVICE( call ), packet, IPC_GET_SENDER( call ));
        case NET_NETIF_START:
            return netif_start_req( 0, IPC_GET_DEVICE( call ));
        case NET_NETIF_STATS:
            fibril_rwlock_read_lock( & netif_globals.lock );
            if( ! ERROR_OCCURRED( ipc_data_read_receive( & callid, & length ))){
                if( length < sizeof( device_stats_t )){
                    ERROR_CODE = EOVERFLOW;
                }else{
                    if( ! ERROR_OCCURRED( netif_get_device_stats( IPC_GET_DEVICE( call ), & stats ))){
                        ERROR_CODE = ipc_data_read_finalize( callid, & stats, sizeof( device_stats_t ));
                    }
                }
            }
            fibril_rwlock_read_unlock( & netif_globals.lock );
            return ERROR_CODE;
        case NET_NETIF_STOP:
            return netif_stop_req( 0, IPC_GET_DEVICE( call ));
        case NET_NETIF_GET_ADDR:
            fibril_rwlock_read_lock( & netif_globals.lock );
            if( ! ERROR_OCCURRED( netif_get_addr_message( IPC_GET_DEVICE( call ), & address ))){
                ERROR_CODE = measured_strings_reply( & address, 1 );
            }
            fibril_rwlock_read_unlock( & netif_globals.lock );
            return ERROR_CODE;
    }
    return netif_specific_message( callid, call, answer, answer_count );
}

int netif_init_module( async_client_conn_t client_connection ){
    ERROR_DECLARE;

    async_set_client_connection( client_connection );
    netif_globals.net_phone = connect_to_service( SERVICE_NETWORKING );
    device_map_initialize( & netif_globals.device_map );
    ERROR_PROPAGATE( pm_init());
    fibril_rwlock_initialize( & netif_globals.lock );
    if( ERROR_OCCURRED( netif_initialize())){
        pm_destroy();
        return ERROR_CODE;
    }
    return EOK;
}

int netif_run_module( void ){
    async_manager();

    pm_destroy();
    return EOK;
}

void netif_pq_release( packet_id_t packet_id ){
    pq_release( netif_globals.net_phone, packet_id );
}

packet_t netif_packet_get_1( size_t content ){
    return packet_get_1( netif_globals.net_phone, content );
}

/** @}
 */