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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 ip

 *  @{

 */

/** @file

 */

#include <async.h>

#include <errno.h>

#include <stdio.h>

#include <string.h>

#include <ipc/ipc.h>

#include <ipc/services.h>

#include <sys/types.h>

#include "../../err.h"

#include "../../messages.h"

#include "../../modules.h"

#include "../../include/net_interface.h"

#include "../../include/sockaddr.h"

#include "../../include/socket.h"

#include "../../include/byteorder.h"

#include "../../include/crc.h"

#include "../../include/device.h"

#include "../../include/arp_interface.h"

#include "../../include/nil_interface.h"

#include "../../include/il_interface.h"

#include "../../include/ip_client.h"

#include "../../include/ip_interface.h"

#include "../../include/tl_interface.h"

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

#include "../../structures/module_map.h"

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

#include "../../nil/nil_messages.h"

#include "../il_messages.h"

#include "ip.h"

#include "ip_header.h"

#include "ip_messages.h"

#include "ip_module.h"

#define DEFAULT_IPV     4

#define IP_MIN_CONTENT  576

#define ARP_NAME                "arp"

#define ARP_FILENAME            "/srv/arp"

#define IP_ADDR                         sizeof( in_addr_t )

#define IP_PREFIX                       sizeof( ip_header_t )

#define IP_SUFFIX                       0

#define IP_MAX_CONTENT                  65535

#define IP_HEADER_LENGTH( header )      (( header )->ihl * 4 )

#define IP_TOTAL_LENGTH( header )       ntohs(( header )->total_length )

#define IP_HEADER_DATA_LENGTH( header ) ( IP_TOTAL_LENGTH( header ) - IP_HEADER_LENGTH( header ))

#define IP_HEADER_CHECKSUM( header )    ( htons( ip_checksum(( uint8_t * )( header ), IP_HEADER_LENGTH( header ))))

//zero is returned as 0xFFFF (not flipped)

#define IP_HEADER_CHECKSUM_ZERO         0xFFFF

ip_globals_t    ip_globals;

DEVICE_MAP_IMPLEMENT( ip_netifs, ip_netif_t )

INT_MAP_IMPLEMENT( ip_protos, ip_proto_t )

GENERIC_FIELD_IMPLEMENT( ip_routes, ip_route_t )

int ip_device_state_msg( int il_phone, device_id_t device_id, device_state_t state );

int ip_register( int protocol, services_t service, int phone, tl_received_msg_t tl_received_msg );

int ip_netif_initialize( ip_netif_ref ip_netif );

int ip_send_route( packet_t packet, ip_netif_ref netif, ip_route_ref route, in_addr_t * src, in_addr_t dest );

int ip_prepare_packet( in_addr_t * source, packet_t packet, measured_string_ref destination );

packet_t    ip_split_packet( packet_t packet, size_t prefix, size_t content, size_t suffix, size_t addr_len );

int ip_fragment_packet( packet_t packet, size_t length, size_t prefix, size_t suffix, size_t addr_len );

int ip_fragment_packet_data( packet_t packet, packet_t new_packet, ip_header_ref header, ip_header_ref new_header, size_t length, void * src, void * dest, size_t address_length );

ip_header_ref   ip_create_middle_header( packet_t packet, ip_header_ref last );

ip_header_ref   ip_create_last_header( packet_t packet, ip_header_ref first );

in_addr_t * ip_netif_addr( ip_netif_ref netif );

ip_route_ref    ip_find_route( in_addr_t destination );

ip_route_ref    ip_netif_find_route( ip_netif_ref netif, in_addr_t destination );

int ip_received_msg( device_id_t device_id, packet_t packet );

int ip_process_packet( device_id_t device_id, packet_t packet );

in_addr_t   ip_get_destination( ip_header_ref header );

int ip_deliver_local( device_id_t device_id, packet_t packet, ip_header_ref header );

/** Computes the ip header checksum.

 *  To compute the checksum of a new packet, the checksum header field must be zero.

 *  To check the checksum of a received packet, the checksum may be left set.

 *  The zero (0) value will returned in this case if valid.

 *  @param data The header data. Input parameter.

 *  @param length The header length in bytes. Input parameter.

 *  @returns The internet protocol header checksum.

 *  @returns IP_HEADER_CHECKSUM_ZERO if the computed checksum is zero.

 */

uint16_t ip_checksum( uint8_t * data, int length );

uint16_t ip_checksum( uint8_t * data, int length ){

    uint16_t    checksum;

    checksum = compact_checksum(compute_checksum( 0, data, length ));

    // flip, zero is returned as 0xFFFF (not flipped)

    return ( ~ checksum ) ? ~ checksum : IP_HEADER_CHECKSUM_ZERO;

}

/** Initializes the module.

 */

int ip_initialize( async_client_conn_t client_connection ){

    ERROR_DECLARE;

    ip_globals.packet_counter = 0;

    ip_globals.gateway.address.s_addr = 0;

    ip_globals.gateway.netmask.s_addr = 0;

    ip_globals.gateway.gateway.s_addr = 0;

    ip_globals.gateway.netif = NULL;

    ERROR_PROPAGATE( ip_netifs_initialize( & ip_globals.netifs ));

    ERROR_PROPAGATE( ip_protos_initialize( & ip_globals.protos ));

    ip_globals.client_connection = client_connection;

    ERROR_PROPAGATE( modules_initialize( & ip_globals.modules ));

    ERROR_PROPAGATE( add_module( NULL, & ip_globals.modules, ARP_NAME, ARP_FILENAME, SERVICE_ARP, arp_task_get_id(), arp_connect_module ));

    return EOK;

}

int ip_device_req( int il_phone, device_id_t device_id, services_t netif ){

    ERROR_DECLARE;

    ip_netif_ref    ip_netif;

    ip_route_ref    route;

    int             index;

    char *          data;

    ip_netif = ( ip_netif_ref ) malloc( sizeof( ip_netif_t ));

    if( ! ip_netif ) return ENOMEM;

    if( ERROR_OCCURRED( ip_routes_initialize( & ip_netif->routes ))){

        free( ip_netif );

        return ERROR_CODE;

    }

    ip_netif->device_id = device_id;

    ip_netif->service = netif;

    ip_netif->state = NETIF_STOPPED;

    if( ERROR_OCCURRED( ip_netif_initialize( ip_netif ))){

        ip_routes_destroy( & ip_netif->routes );

        free( ip_netif );

        return ERROR_CODE;

    }

    if( ip_netif->arp ) ++ ip_netif->arp->usage;

    // print the settings

    printf( "New device registered:\n\tid\t= %d\n\tphone\t= %d\n\tIPV\t= %d\n", ip_netif->device_id, ip_netif->phone, ip_netif->ipv );

    printf( "\tconfiguration\t= %s\n", ip_netif->dhcp ? "dhcp" : "static" );

    // TODO ipv6 addresses

    data = ( char * ) malloc( INET_ADDRSTRLEN );

    if( data ){

        for( index = 0; index < ip_routes_count( & ip_netif->routes ); ++ index ){

            route = ip_routes_get_index( & ip_netif->routes, index );

            if( route ){

                printf( "\tRouting %d:\n", index );

                inet_ntop( AF_INET, ( uint8_t * ) & route->address.s_addr, data, INET_ADDRSTRLEN );

                printf( "\t\taddress\t= %s\n", data );

                inet_ntop( AF_INET, ( uint8_t * ) & route->netmask.s_addr, data, INET_ADDRSTRLEN );

                printf( "\t\tnetmask\t= %s\n", data );

                inet_ntop( AF_INET, ( uint8_t * ) & route->gateway.s_addr, data, INET_ADDRSTRLEN );

                printf( "\t\tgateway\t= %s\n", data );

            }

        }

        inet_ntop( AF_INET, ( uint8_t * ) & ip_netif->broadcast.s_addr, data, INET_ADDRSTRLEN );

        printf( "\tbroadcast\t= %s\n", data );

        inet_ntop( AF_INET, ( uint8_t * ) & ip_netif->dns1, data, INET_ADDRSTRLEN );

        printf( "\tdns1\t= %s\n", data );

        inet_ntop( AF_INET, ( uint8_t * ) & ip_netif->dns2, data, INET_ADDRSTRLEN );

        printf( "\tdns2\t= %s\n", data );

        free( data );

    }

    return EOK;

}

int ip_netif_initialize( ip_netif_ref ip_netif ){

    ERROR_DECLARE;

    measured_string_t   names[ 9 ] = {{ "IPV", 3 }, { "IP_CONFIG", 9 }, { "IP_ADDR", 7 }, { "NETMASK", 7 }, { "GATEWAY", 7 }, { "BROADCAST", 9 }, { "DNS1", 4 }, { "DNS2", 4 }, { "ARP", 3 }};

    measured_string_ref configuration;

    size_t              count = sizeof( names ) / sizeof( measured_string_t );

    char *              data;

    int                 index;

    ip_route_ref        route;

    in_addr_t           gateway;

    configuration = & names[ 0 ];

    // get configuration

    ERROR_PROPAGATE( net_get_device_conf_req( ip_globals.net_phone, ip_netif->device_id, & configuration, count, & data ));

    if( configuration ){

        if( configuration[ 0 ].value ){

            ip_netif->ipv = strtol( configuration[ 0 ].value, NULL, 0 );

        }else{

            ip_netif->ipv = DEFAULT_IPV;

        }

        ip_netif->dhcp = ! str_lcmp( configuration[ 1 ].value, "dhcp", configuration[ 1 ].length );

        if( ip_netif->dhcp ){

            // TODO dhcp

            net_free_settings( configuration, data );

            return ENOTSUP;

        }else if( ip_netif->ipv == 4 ){

            route = ( ip_route_ref ) malloc( sizeof( ip_route_t ));

            if( ! route ){

                net_free_settings( configuration, data );

                return ENOMEM;

            }

            route->address.s_addr = 0;

            route->netmask.s_addr = 0;

            route->gateway.s_addr = 0;

            route->netif = ip_netif;

            index = ip_routes_add( & ip_netif->routes, route );

            if( index < 0 ){

                net_free_settings( configuration, data );

                free( route );

                return index;

            }

            if( ERROR_OCCURRED( inet_pton( AF_INET, configuration[ 2 ].value, ( uint8_t * ) & route->address.s_addr ))

            || ERROR_OCCURRED( inet_pton( AF_INET, configuration[ 3 ].value, ( uint8_t * ) & route->netmask.s_addr ))

            || ( inet_pton( AF_INET, configuration[ 4 ].value, ( uint8_t * ) & gateway.s_addr ) == EINVAL )

            || ( inet_pton( AF_INET, configuration[ 5 ].value, ( uint8_t * ) & ip_netif->broadcast.s_addr ) == EINVAL )

            || ( inet_pton( AF_INET, configuration[ 6 ].value, ( uint8_t * ) & ip_netif->dns1 ) == EINVAL )

            || ( inet_pton( AF_INET, configuration[ 7 ].value, ( uint8_t * ) & ip_netif->dns2 ) == EINVAL )){

                net_free_settings( configuration, data );

                return EINVAL;

            }

        }else{

            // TODO ipv6 in separate module

            net_free_settings( configuration, data );

            return ENOTSUP;

        }

        if( configuration[ 8 ].value ){

            ip_netif->arp = get_running_module( & ip_globals.modules, configuration[ 8 ].value );

            if( ! ip_netif->arp ){

                printf( "Failed to start the arp %s\n", configuration[ 8 ].value );

                net_free_settings( configuration, data );

                return EINVAL;

            }

        }else{

            ip_netif->arp = NULL;

        }

        net_free_settings( configuration, data );

    }

    ip_netif->phone = bind_service( ip_netif->service, ip_netif->device_id, SERVICE_IP, 0, ip_globals.client_connection );

    if( ip_netif->phone < 0 ){

        printf( "Failed to contact the nil service %d\n", ip_netif->service );

        return ip_netif->phone;

    }

    // MUST BE AFTER the bind_service up there!

    if( ip_netif->arp ){

        configuration[ 0 ].value = ( char * ) & route->address.s_addr;

        configuration[ 0 ].length = CONVERT_SIZE( in_addr_t, char, 1 );

        ERROR_PROPAGATE( arp_device_req( ip_netif->arp->phone, ip_netif->device_id, SERVICE_IP, ip_netif->service, & configuration[ 0 ] ));

    }

    // get packet dimensions

    ERROR_PROPAGATE( nil_packet_size_req( ip_netif->phone, ip_netif->device_id, & ip_netif->addr_len, & ip_netif->prefix, & ip_netif->content, & ip_netif->suffix ));

    if( ip_netif->content < IP_MIN_CONTENT ){

        printf( "Maximum transmission unit %d bytes is too small, at least %d bytes are needed\n", ip_netif->content, IP_MIN_CONTENT );

        ip_netif->content = IP_MIN_CONTENT;

    }

    index = ip_netifs_add( & ip_globals.netifs, ip_netif->device_id, ip_netif );

    if( index < 0 ) return index;

    if( gateway.s_addr ){

        // the default gateway

        ip_globals.gateway.address.s_addr = 0;

        ip_globals.gateway.netmask.s_addr = 0;

        ip_globals.gateway.gateway.s_addr = gateway.s_addr;

        ip_globals.gateway.netif = ip_netif;

    }

    return EOK;

}

int ip_device_state_msg( int il_phone, device_id_t device_id, device_state_t state ){

    ERROR_DECLARE;

/*  measured_string_t   address;

    measured_string_ref translation;

    char *              data;

*/

    packet_t        packet;

    in_addr_t       destination;

    ip_netif_ref    netif;

    netif = ip_netifs_find( & ip_globals.netifs, device_id );

    if( ! netif ) return ENOENT;

    netif->state = state;

    // TODO state

    printf( "ip - device %d changed state to %d\n\n", device_id, state );

    if( netif->arp ){

/*      address.value = ( char * ) & ip_globals.gateway.gateway.s_addr;

        address.length = CONVERT_SIZE( ip_globals.gateway.gateway.s_addr, char, 1 );

        if( ERROR_OCCURRED( arp_translate_req( netif->arp->phone, netif->device_id, SERVICE_IP, & address, & translation, & data ))){

            ERROR_PROPAGATE( arp_translate_req( netif->arp->phone, netif->device_id, SERVICE_IP, & address, & translation, & data ));

        }

        printf( "\tgateway translated to\t= %X:%X:%X:%X:%X:%X\n", data[ 0 ], data[ 1 ], data[ 2 ], data[ 3 ], data[ 4 ], data[ 5 ] );

        free( translation );

        free( data );

        address.value = ( char * ) & ip_globals.gateway.gateway.s_addr;

        address.length = CONVERT_SIZE( ip_globals.gateway.gateway.s_addr, char, 1 );

        if( ERROR_OCCURRED( arp_translate_req( netif->arp->phone, netif->device_id, SERVICE_IP, & address, & translation, & data ))){

            sleep( 2 );

            ERROR_PROPAGATE( arp_translate_req( netif->arp->phone, netif->device_id, SERVICE_IP, & address, & translation, & data ));

        }

        printf( "\tgateway translated to\t= %X:%X:%X:%X:%X:%X\n", data[ 0 ], data[ 1 ], data[ 2 ], data[ 3 ], data[ 4 ], data[ 5 ] );

        free( translation );

        free( data );

*/      printf( "IP - testing to send packet:\n" );

        ERROR_PROPAGATE( inet_pton( AF_INET, "90.182.101.18", ( uint8_t * ) & destination.s_addr ));

        packet = packet_get_4( ip_globals.net_phone, 30, netif->addr_len, netif->prefix + sizeof( ip_header_t ), netif->suffix );

        if( ! packet ) return ENOMEM;

        pq_release( ip_globals.net_phone, packet_get_id( packet ));

        packet = packet_get_4( ip_globals.net_phone, 30, netif->addr_len, netif->prefix + sizeof( ip_header_t ), netif->suffix );

        if( ! packet ) return ENOMEM;

        pq_release( ip_globals.net_phone, packet_get_id( packet ));

        packet = packet_get_4( ip_globals.net_phone, 30, netif->addr_len, netif->prefix + sizeof( ip_header_t ), netif->suffix );

        if( ! packet ) return ENOMEM;

        pq_release( ip_globals.net_phone, packet_get_id( packet ));

        packet = packet_get_4( ip_globals.net_phone, 1500, netif->addr_len, netif->prefix + sizeof( ip_header_t ), netif->suffix );

        if( ! packet ) return ENOMEM;

        // try this long version

//      if( ERROR_OCCURRED( packet_copy_data( packet, "Hi, this is IP, wery long version 1, wery long version 2, wery long version 3, wery long version 4, wery long version 5, wery long version 6, wery long version 7, wery long version 8, wery long version 9, wery long version 10, wery long version 11, wery long version 12, wery long version 13, wery long version 14, wery long version 15, wery long version 16, wery long version 17, wery long version 18, wery long version 19, wery long version 20, wery long version 21, wery long version 22, wery long version 23, wery long version 24, wery long version 25, wery long version 26, wery long version 27, wery long version 28, wery long version 29, wery long version 30Hi, this is IP, wery long version 1, wery long version 2, wery long version 3, wery long version 4, wery long version 5, wery long version 6, wery long version 7, wery long version 8, wery long version 9, wery long version 10, wery long version 11, wery long version 12, wery long version 13, wery long version 14, wery long version 15, wery long version 16, wery long version 17, wery long version 18, wery long version 19, wery long version 20, wery long version 21, wery long version 22, wery long version 23, wery long version 24, wery long version 25, wery long version 26, wery long version 27, wery long version 28, wery long version 29, wery long version 30", 1330 ))

        if( ERROR_OCCURRED( packet_copy_data( packet, "Hi, this is IP", 14 ))

        || ERROR_OCCURRED( packet_set_addr( packet, NULL, ( uint8_t * ) & destination.s_addr, 4 ))

        || ERROR_OCCURRED( ip_client_prepare_packet( packet, 0, 0, 0, 0, 0 ))){

            pq_release( ip_globals.net_phone, packet_get_id( packet ));

        }

        ERROR_CODE = ip_send_msg( 0, 0, packet, SERVICE_IP );

        printf( "send returned %d\n", ERROR_CODE );

    }

    return EOK;

}

int ip_connect_module( services_t service ){

    return EOK;

}

int ip_bind_service( services_t service, int protocol, services_t me, async_client_conn_t receiver, tl_received_msg_t tl_received_msg ){

    return ip_register( protocol, me, 0, tl_received_msg );

}

int ip_register( int protocol, services_t service, int phone, tl_received_msg_t tl_received_msg ){

    ip_proto_ref    proto;

    int             index;

    if( !( protocol && service && (( phone > 0 ) || ( tl_received_msg )))) return EINVAL;

    proto = ( ip_proto_ref ) malloc( sizeof( ip_protos_t ));

    if( ! proto ) return ENOMEM;

    proto->protocol = protocol;

    proto->service = service;

    proto->phone = phone;

    proto->tl_received_msg = tl_received_msg;

    index = ip_protos_add( & ip_globals.protos, proto->protocol, proto );

    if( index < 0 ){

        free( proto );

        return index;

    }

    printf( "New protocol registered:\n\tprotocol\t= %d\n\tphone\t= %d\n", proto->protocol, proto->phone );

    return EOK;

}

int ip_send_msg( int il_phone, device_id_t device_id, packet_t packet, services_t sender ){

    ERROR_DECLARE;

    int                 length;

    ip_netif_ref        netif;

    ip_route_ref        route;

    in_addr_t           dest;

    in_addr_t *         src;

    // addresses in the host byte order

    // should be the next hop address or the target destination address

    length = packet_get_addr( packet, NULL, ( void * )( & dest.s_addr ));

    if( length < 0 ){

        pq_release( ip_globals.net_phone, packet_get_id( packet ));

        return length;

    }

    // TODO IPv6

    if( length != IP_ADDR ){

        pq_release( ip_globals.net_phone, packet_get_id( packet ));

        return EINVAL;

    }

//  rwlock_read_lock( & ip_globals.devices_lock );

    // device specified?

//  dest.s_addr = ntohl( dest.s_addr );

    if( device_id ){

        netif = ip_netifs_find( & ip_globals.netifs, device_id );

        route = ip_netif_find_route( netif, dest );

    }else{

        // TODO IPv6

        route = ip_find_route( dest );

        netif = route ? route->netif : NULL;

    }

    if( !( netif && route )){

//      rwlock_read_unlock( & ip_globals.devices_lock );

        pq_release( ip_globals.net_phone, packet_get_id( packet ));

        return ENOENT;

    }

    // to me?

    if( route->address.s_addr == dest.s_addr ){

        // TODO loopback deliver

    }

    src = ip_netif_addr( netif );

    if( ! src ){

        pq_release( ip_globals.net_phone, packet_get_id( packet ));

        return ENOENT;

    }

    if( ERROR_OCCURRED( ip_send_route( packet, netif, route, src, dest ))){

        pq_release( ip_globals.net_phone, packet_get_id( packet ));

    }

    return ERROR_CODE;

}

in_addr_t * ip_netif_addr( ip_netif_ref netif ){

    ip_route_ref    route;

    route = ip_routes_get_index( & netif->routes, 0 );

    return route ? & route->address : NULL;

}

int ip_send_route( packet_t packet, ip_netif_ref netif, ip_route_ref route, in_addr_t * src, in_addr_t dest ){

    ERROR_DECLARE;

    packet_t            next;

    packet_t            tmp;

    measured_string_t   destination;

    measured_string_ref translation;

    char *              data;

    if( route->gateway.s_addr ){

        dest.s_addr = route->gateway.s_addr;

    }

    // get destination hardware address

    if( netif->arp ){

        destination.value = ( char * ) & dest.s_addr;

        destination.length = CONVERT_SIZE( dest.s_addr, char, 1 );

        if( ERROR_OCCURRED( arp_translate_req( netif->arp->phone, netif->device_id, SERVICE_IP, & destination, & translation, & data ))){

            usleep( 200000 );

            ERROR_PROPAGATE( arp_translate_req( netif->arp->phone, netif->device_id, SERVICE_IP, & destination, & translation, & data ));

        }

        // TODO unreachable

        if( ! translation ) return EINVAL;

        if( ! translation->value ){

            // TODO unreachable

            free( translation );

            free( data );

            return EINVAL;

        }

    }else translation = NULL;

    // process packet queue

    next = packet;

    do{

        if( ERROR_OCCURRED( ip_prepare_packet( src, next, translation ))){

            // release invalid packet

            tmp = pq_detach( next );

            if( next == packet ) packet = tmp;

            pq_release( ip_globals.net_phone, packet_get_id( next ));

            next = tmp;

        }else{

            next = pq_next( next );

        }

    }while( next );

    if( translation ){

        free( translation );

        free( data );

    }

    // send packet queue

    if( packet ){

        packet = ip_split_packet( packet, netif->prefix, netif->content, netif->suffix, netif->addr_len );

        if( packet ){

            nil_send_msg( netif->phone, netif->device_id, packet, SERVICE_IP );

        }

    }

//  rwlock_read_unlock( & ip_globals.netifs_lock );

    return EOK;

}

int ip_prepare_packet( in_addr_t * source, packet_t packet, measured_string_ref destination ){

    ERROR_DECLARE;

    int                 length;

    ip_header_ref       header;

    length = packet_get_data_length( packet );

    if(( length < sizeof( ip_header_t )) || ( length > IP_MAX_CONTENT )) return EINVAL;

    header = ( ip_header_ref ) packet_get_data( packet );

    if( destination ){

        ERROR_PROPAGATE( packet_set_addr( packet, NULL, ( uint8_t * ) destination->value, CONVERT_SIZE( char, uint8_t, destination->length )));

    }

    header->version = 4;

    header->total_length = htons( length );

    header->fragment_offset = 0;

    if( source ) header->source_address = source->s_addr;//htonl( source.s_addr );

    ++ ip_globals.packet_counter;

    header->identification = htons( ip_globals.packet_counter );

    header->header_checksum = 0;

    // unnecessary for all protocols

    header->header_checksum = IP_HEADER_CHECKSUM( header );

    return EOK;

}

int ip_message( ipc_callid_t callid, ipc_call_t * call, ipc_call_t * answer, int * answer_count ){

    ERROR_DECLARE;

    packet_t    packet;

    * answer_count = 0;

    switch( IPC_GET_METHOD( * call )){

        case IPC_M_PHONE_HUNGUP:

            return EOK;

        case NET_IL_DEVICE:

            return ip_device_req( 0, IPC_GET_DEVICE( call ), IPC_GET_SERVICE( call ));

        case IPC_M_CONNECT_TO_ME:

            return ip_register( IL_GET_PROTO( call ), IL_GET_SERVICE( call ), IPC_GET_PHONE( call ), NULL );

        case NET_IL_SEND:

            ERROR_PROPAGATE( packet_translate( ip_globals.net_phone, & packet, IPC_GET_PACKET( call )));

            return ip_send_msg( 0, IPC_GET_DEVICE( call ), packet, 0 );

        case NET_IL_DEVICE_STATE:

        case NET_NIL_DEVICE_STATE:

            return ip_device_state_msg( 0, IPC_GET_DEVICE( call ), IPC_GET_STATE( call ));

        case NET_IL_RECEIVED:

        case NET_NIL_RECEIVED:

            ERROR_PROPAGATE( packet_translate( ip_globals.net_phone, & packet, IPC_GET_PACKET( call )));

            return ip_received_msg( IPC_GET_DEVICE( call ), packet );

        case NET_IP_ADD_ROUTE:

            return ip_add_route_req( 0, IPC_GET_DEVICE( call ), IP_GET_ADDRESS( call ), IP_GET_NETMASK( call ), IP_GET_GATEWAY( call ));

        case NET_IP_SET_GATEWAY:

            return ip_set_gateway_req( 0, IPC_GET_DEVICE( call ), IP_GET_GATEWAY( call ));

        case NET_IL_PACKET_SPACE:

            ERROR_PROPAGATE( ip_packet_size_req( 0, IPC_GET_DEVICE( call ), IPC_SET_ADDR( answer ), IPC_SET_PREFIX( answer ), IPC_SET_CONTENT( answer ), IPC_SET_SUFFIX( answer )));

            * answer_count = 3;

            return EOK;

    }

    return ENOTSUP;

}

int ip_packet_size_req( int ip_phone, device_id_t device_id, size_t * addr_len, size_t * prefix, size_t * content, size_t * suffix ){

    ip_netif_ref    netif;

    if( !( addr_len && prefix && content && suffix )) return EBADMEM;

//  rwlock_read_lock( & ip_globals.netifs_lock );

    netif = ip_netifs_find( & ip_globals.netifs, device_id );

    if( ! netif ){

//      rwlock_read_unlock( & ip_globals.netifs_lock );

        return ENOENT;

    }

    * content = IP_MAX_CONTENT - IP_PREFIX;

    * addr_len = ( netif->addr_len > IP_ADDR ) ? netif->addr_len : IP_ADDR;

    * prefix = netif->prefix + IP_PREFIX;

    * suffix = netif->suffix + IP_SUFFIX;

//  rwlock_read_unlock( & ip_globals.netifs_lock );

    return EOK;

}

int ip_add_route_req( int ip_phone, device_id_t device_id, in_addr_t address, in_addr_t netmask, in_addr_t gateway ){

    ip_route_ref    route;

    ip_netif_ref    netif;

    int             index;

    netif = ip_netifs_find( & ip_globals.netifs, device_id );

    if( ! netif ) return ENOENT;

    route = ( ip_route_ref ) malloc( sizeof( ip_route_t ));

    if( ! route ) return ENOMEM;

    route->address.s_addr = address.s_addr;

    route->netmask.s_addr = netmask.s_addr;

    route->gateway.s_addr = gateway.s_addr;

    route->netif = netif;

    index = ip_routes_add( & netif->routes, route );

    if( index < 0 ) free( route );

    return index;

}

ip_route_ref ip_find_route( in_addr_t destination ){

    int             index;

    ip_route_ref    route;

    ip_netif_ref    netif;

    // start with the last netif - the newest one

    index = ip_netifs_count( & ip_globals.netifs ) - 1;

    while( index >= 0 ){

        netif = ip_netifs_get_index( & ip_globals.netifs, index );

        if( netif && ( netif->state == NETIF_ACTIVE )){

            route = ip_netif_find_route( netif, destination );

            if( route ) return route;

        }

        -- index;

    }

    return & ip_globals.gateway;

}

ip_route_ref ip_netif_find_route( ip_netif_ref netif, in_addr_t destination ){

    int             index;

    ip_route_ref    route;

    if( netif ){

        // start with the first one - the direct route

        for( index = 0; index < ip_routes_count( & netif->routes ); ++ index ){

            route = ip_routes_get_index( & netif->routes, index );

            if( route && (( route->address.s_addr & route->netmask.s_addr ) == ( destination.s_addr & route->netmask.s_addr ))){

                return route;

            }

        }

    }

    return NULL;

}

int ip_set_gateway_req( int ip_phone, device_id_t device_id, in_addr_t gateway ){

    ip_netif_ref    netif;

    netif = ip_netifs_find( & ip_globals.netifs, device_id );

    if( ! netif ) return ENOENT;

    ip_globals.gateway.address.s_addr = 0;

    ip_globals.gateway.netmask.s_addr = 0;

    ip_globals.gateway.gateway.s_addr = gateway.s_addr;

    ip_globals.gateway.netif = netif;

    return EOK;

}

packet_t ip_split_packet( packet_t packet, size_t prefix, size_t content, size_t suffix, size_t addr_len ){

    size_t          length;

    packet_t        next;

    packet_t        new_packet;

    next = packet;

    // check all packets

    while( next ){

        length = packet_get_data_length( next );

        // too long?

        if( length > content ){

            if( ip_fragment_packet( next, content, prefix, suffix, addr_len ) != EOK ){

                new_packet = pq_detach( next );

                if( next == packet ){

                    packet = new_packet;

                }

                pq_release( ip_globals.net_phone, packet_get_id( next ));

                next = new_packet;

                continue;

            }

        }

        next = pq_next( next );

    }

    return packet;

}

int ip_fragment_packet( packet_t packet, size_t length, size_t prefix, size_t suffix, size_t addr_len ){

    ERROR_DECLARE;

    packet_t        new_packet;

    ip_header_ref   header;

    ip_header_ref   middle_header;

    ip_header_ref   last_header;

    uint8_t *       src;

    uint8_t *       dest;

    int             address_length;

    address_length = packet_get_addr( packet, & src, & dest );

    if( address_length <= 0 ) return EINVAL;

    if( packet_get_data_length( packet ) <= sizeof( ip_header_t )) return ENOMEM;

    // get header

    header = ( ip_header_ref ) packet_get_data( packet );

    if( ! header ) return EINVAL;

    // fragmentation forbidden?

    if( header->flags & IPFLAG_DONT_FRAGMENT ){

        // TODO fragmentation necessary ICMP

        return EPERM;

    }

    // create the last fragment

    new_packet = packet_get_4( ip_globals.net_phone, prefix, length, suffix, (( address_length > addr_len ) ? address_length : addr_len ));