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3666 mejdrech 1
/*
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 * Copyright (c) 2009 Lukas Mejdrech
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup lo
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 *  @{
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 */
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/** @file
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 *  Loopback network interface implementation.
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 */
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#include <async.h>
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#include <errno.h>
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#include <stdio.h>
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#include <ipc/ipc.h>
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#include <ipc/services.h>
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#include "../../err.h"
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#include "../../messages.h"
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#include "../../modules.h"
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#include "../../structures/measured_strings.h"
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#include "../../structures/packet/packet_client.h"
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#include "../../include/device.h"
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#include "../../include/nil_interface.h"
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#include "../../include/net_interface.h"
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#include "../../nil/nil_messages.h"
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#include "../netif.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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/** Default hardware address.
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 */
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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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/** Loopback module name.
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 */
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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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/** Loopback module global data.
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 */
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static struct lo_globals{
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    unsigned int mtu;
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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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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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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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int netif_specific_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){
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    switch( IPC_GET_METHOD( * call )){
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        case NET_NIL_PACKET_SPACE:
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            * IPC_SET_ADDR( answer ) = 0;
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            * IPC_SET_PREFIX( answer ) = 0;
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            * IPC_SET_CONTENT( answer ) = lo_globals.mtu;
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            * IPC_SET_SUFFIX( answer ) = 0;
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            * answer_count = 4;
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            return EOK;
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        default:
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            return ENOTSUP;
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    }
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}
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int netif_get_addr_message( device_id_t device_id, measured_string_ref address ){
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    if( ! address ) return EBADMEM;
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    address->value = DEFAULT_ADDR;
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    address->length = DEFAULT_ADDR_LEN;
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    return EOK;
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}
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int netif_get_device_stats( device_id_t device_id, device_stats_ref stats ){
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    ERROR_DECLARE;
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    device_ref  device;
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    if( ! stats ) return EBADMEM;
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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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    return EOK;
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}
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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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        device->state = state;
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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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    }
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    return EOK;
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}
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int create( device_id_t device_id, device_ref * device ){
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    int index;
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    if( device_map_count( & netif_globals.device_map ) > 0 ){
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        return EXDEV;
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    }else{
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        * device = ( device_ref ) malloc( sizeof( device_t ));
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        if( !( * device )) return ENOMEM;
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        ( ** device ).specific = malloc( sizeof( device_stats_t ));
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        if( ! ( ** device ).specific ){
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            free( * device );
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            return ENOMEM;
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        }
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        null_device_stats(( device_stats_ref )( ** device ).specific );
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        ( ** device ).device_id = device_id;
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        ( ** device ).nil_phone = -1;
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        ( ** device ).state = NETIF_STOPPED;
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        index = device_map_add( & netif_globals.device_map, ( ** device ).device_id, * device );
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        if( index < 0 ){
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            free( * device );
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            free(( ** device ).specific );
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            * device = NULL;
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            return index;
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        }
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    }
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    return EOK;
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}
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int netif_initialize( void ){
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    ipcarg_t    phonehash;
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    return REGISTER_ME( SERVICE_LO, & phonehash );
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}
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void module_print_name( void ){
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    printf( "%s", NAME );
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}
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int netif_probe_auto_message( void ){
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/*  ERROR_DECLARE;
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    device_ref  device;
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    ERROR_PROPAGATE( create( arg1, & device ));
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    ipc_call_sync_3_3( netif_globals.net_phone, NET_NET_DEVICE, device->device_id, NULL, NULL, NULL, NULL, NULL );
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*/  return ENOTSUP;
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}
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int netif_probe_message( device_id_t device_id, int irq, int io ){
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    ERROR_DECLARE;
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    device_ref          device;
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    measured_string_t   names[ 1 ] = {{ "MTU", 3 }};
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    measured_string_ref configuration;
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    size_t              count = sizeof( names ) / sizeof( measured_string_t );
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    char *              data;
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    configuration = & names[ 0 ];
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    // create a new device
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    ERROR_PROPAGATE( create( device_id, & device ));
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    // get configuration
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    ERROR_PROPAGATE( net_get_device_conf_req( netif_globals.net_phone, device->device_id, & configuration, count, & data ));
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    // MTU is the first one
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    if( configuration && configuration[ 0 ].value ){
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        lo_globals.mtu = strtoul( configuration[ 0 ].value, NULL, 0 );
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        net_free_settings( configuration, data );
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    }else{
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        lo_globals.mtu = DEFAULT_MTU;
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    }
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    // print the settings
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    printf("New device registered:\n\tid\t= %d\n\tMTU\t= %d\n", device->device_id, lo_globals.mtu );
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    return EOK;
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}
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int netif_send_message( device_id_t device_id, packet_t packet, services_t sender ){
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    ERROR_DECLARE;
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    device_ref  device;
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    size_t      length;
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    packet_t    next;
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    int         phone;
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    ERROR_PROPAGATE( find_device( device_id, & device ));
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    if( device->state != NETIF_ACTIVE ) return EPERM;
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    next = packet;
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    do{
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        ++ (( device_stats_ref ) device->specific )->tx_packets;
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        ++ (( device_stats_ref ) device->specific )->rx_packets;
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        length = packet_get_data_length( next );
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        (( device_stats_ref ) device->specific )->tx_bytes += length;
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        (( device_stats_ref ) device->specific )->rx_bytes += length;
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        next = pq_next( next );
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    }while( next );
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    phone = device->nil_phone;
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    rwlock_write_unlock( & netif_globals.lock );
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    nil_received_msg( phone, device_id, packet, sender );
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    rwlock_write_lock( & netif_globals.lock );
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    return EOK;
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}
248
 
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int netif_start_message( device_ref device ){
250
    return change_state_message( device, NETIF_ACTIVE );
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}
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int netif_stop_message( device_ref device ){
254
    return change_state_message( device, NETIF_STOPPED );
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}
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/** @}
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 */