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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

 *  IP module implementation.

 *  @see arp.h

 *  \todo

 */

#include <async.h>

#include <errno.h>

#include <fibril_sync.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/arp_interface.h"

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

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

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

#include "../../include/icmp_client.h"

#include "../../include/icmp_codes.h"

#include "../../include/icmp_interface.h"

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

#include "../../include/in.h"

#include "../../include/in6.h"

#include "../../include/inet.h"

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

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

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

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

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

#include "../../include/socket_codes.h"

#include "../../include/socket_errno.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"

/** IP version 4.

 */

#define IPV4                4

/** Default network interface IP version.

 */

#define NET_DEFAULT_IPV     IPV4

/** Default network interface IP routing.

 */

#define NET_DEFAULT_IP_ROUTING  false

/** Minimum IP packet content.

 */

#define IP_MIN_CONTENT  576

/** ARP module name.

 */

#define ARP_NAME                "arp"

/** ARP module filename.

 */

#define ARP_FILENAME            "/srv/arp"

/** IP packet address length.

 */

#define IP_ADDR                         sizeof( struct sockaddr_in6 )

/** IP packet prefix length.

 */

#define IP_PREFIX                       sizeof( ip_header_t )

/** IP packet suffix length.

 */

#define IP_SUFFIX                       0

/** IP packet maximum content length.

 */

#define IP_MAX_CONTENT                  65535

/** The IP localhost address.

 */

#define IPV4_LOCALHOST_ADDRESS  htonl(( 127 << 24 ) + 1 )

/** IP global data.

 */

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 )

/** Updates the device content length according to the new MTU value.

 *  @param device_id The device identifier. Input parameter.

 *  @param mtu The new mtu value. Input parameter.

 *  @returns EOK on success.

 *  @returns ENOENT if device is not found.

 */

int ip_mtu_changed_message( device_id_t device_id, size_t mtu );

/** Updates the device state.

 *  @param device_id The device identifier. Input parameter.

 *  @param state The new state value. Input parameter.

 *  @returns EOK on success.

 *  @returns ENOENT if device is not found.

 */

int ip_device_state_message( 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 );

/** Initializes a new network interface specific data.

 *  Connects to the network interface layer module, reads the netif configuration, starts an ARP module if needed and sets the netif routing table.

 *  The device identifier and the nil service has to be set.

 *  @param ip_netif Network interface specific data. Input/output parameter.

 *  @returns EOK on success.

 *  @returns ENOTSUP if DHCP is configured.

 *  @returns ENOTSUP if IPv6 is configured.

 *  @returns EINVAL if any of the addresses is invalid.

 *  @returns EINVAL if the used ARP module is not known.

 *  @returns ENOMEM if there is not enough memory left.

 *  @returns Other error codes as defined for the net_get_device_conf_req() function.

 *  @returns Other error codes as defined for the bind_service() function.

 *  @returns Other error codes as defined for the specific arp_device_req() function.

 *  @returns Other error codes as defined for the nil_packet_size_req() function.

 */

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, services_t error );

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

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

int ip_fragment_packet( packet_t packet, size_t length, size_t prefix, size_t suffix, socklen_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, const struct sockaddr * src, const struct sockaddr * dest, socklen_t addrlen );

ip_header_ref   ip_create_middle_header( packet_t packet, ip_header_ref last );

void ip_create_last_header( ip_header_ref last, ip_header_ref first );

in_addr_t * ip_netif_address( 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 );

/** Processes the received IP packet.

 *  @param device_id The source device identifier. Input parameter.

 *  @param packet The received packet. Input/output parameter.

 *  @returns EOK on success and the packet is no longer needed.

 *  @returns EINVAL if the packet is too small to carry the IP packet.

 *  @returns EINVAL if the received address lengths differs from the registered values.

 *  @returns ENOENT if the device is not found in the cache.

 *  @returns ENOENT if the protocol for the device is not found in the cache.

 *  @returns ENOMEM if there is not enough memory left.

 */

int ip_receive_message( 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, services_t error );

int ip_prepare_icmp_and_get_phone( services_t error, packet_t packet, ip_header_ref header );

int ip_get_icmp_phone( void );

int ip_prepare_icmp( packet_t packet, ip_header_ref header );

int ip_release_and_return( packet_t packet, int result );

int ip_initialize( async_client_conn_t client_connection ){

    ERROR_DECLARE;

    fibril_rwlock_initialize( & ip_globals.lock );

    fibril_rwlock_write_lock( & ip_globals.lock );

    fibril_rwlock_initialize( & ip_globals.protos_lock );

    fibril_rwlock_initialize( & ip_globals.netifs_lock );

    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 ));

    fibril_rwlock_write_unlock( & ip_globals.lock );

    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;

    fibril_rwlock_write_lock( & ip_globals.netifs_lock );

    if( ERROR_OCCURRED( ip_netif_initialize( ip_netif ))){

        fibril_rwlock_write_unlock( & ip_globals.netifs_lock );

        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 );

    }

    fibril_rwlock_write_unlock( & ip_globals.netifs_lock );

    return EOK;

}

int ip_netif_initialize( ip_netif_ref ip_netif ){

    ERROR_DECLARE;

    measured_string_t   names[] = {{ "IPV", 3 }, { "IP_CONFIG", 9 }, { "IP_ADDR", 7 }, { "NETMASK", 7 }, { "GATEWAY", 7 }, { "BROADCAST", 9 }, { "DNS1", 4 }, { "DNS2", 4 }, { "ARP", 3 }, { "IP_ROUTING", 10 }};

    measured_string_ref configuration;

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

    char *              data;

    measured_string_t   address;

    int                 index;

    ip_route_ref        route;

    in_addr_t           gateway;

    ip_netif->arp = NULL;

    route = NULL;

    ip_netif->ipv = NET_DEFAULT_IPV;

    ip_netif->dhcp = false;

    ip_netif->routing = NET_DEFAULT_IP_ROUTING;

    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 );

        }

        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 == IPV4 ){

            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;

            }

        }

        if( configuration[ 9 ].value ){

            ip_netif->routing = ( configuration[ 9 ].value[ 0 ] == 'y' );

        }

        net_free_settings( configuration, data );

    }

    // binds the netif service which also initializes the device

    ip_netif->phone = bind_service( ip_netif->service, ( ipcarg_t ) 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;

    }

    // has to be after the device netif module initialization

    if( ip_netif->arp ){

        if( route ){

            address.value = ( char * ) & route->address.s_addr;

            address.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, & address ));

        }else{

            ip_netif->arp = 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_mtu_changed_message( device_id_t device_id, size_t mtu ){

    ip_netif_ref    netif;

    fibril_rwlock_write_lock( & ip_globals.netifs_lock );

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

    if( ! netif ){

        fibril_rwlock_write_unlock( & ip_globals.netifs_lock );

        return ENOENT;

    }

    netif->content = mtu;

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

    fibril_rwlock_write_unlock( & ip_globals.netifs_lock );

    return EOK;

}

int ip_device_state_message( 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;

    fibril_rwlock_write_lock( & ip_globals.netifs_lock );

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

    if( ! netif ){

        fibril_rwlock_write_unlock( & ip_globals.netifs_lock );

        return ENOENT;

    }

    netif->state = state;

    // TODO state

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

    fibril_rwlock_write_unlock( & ip_globals.netifs_lock );

//  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 received_msg ){

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

}

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

    ip_proto_ref    proto;

    int             index;

    if( !( protocol && service && (( phone > 0 ) || ( 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->received_msg = received_msg;

    fibril_rwlock_write_lock( & ip_globals.protos_lock );

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

    if( index < 0 ){

        fibril_rwlock_write_unlock( & ip_globals.protos_lock );

        free( proto );

        return index;

    }

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

    fibril_rwlock_write_unlock( & ip_globals.protos_lock );

    return EOK;

}

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

    ERROR_DECLARE;

    int                 addrlen;

    ip_netif_ref        netif;

    ip_route_ref        route;

    struct sockaddr *       addr;

    struct sockaddr_in *    address_in;

//  struct sockaddr_in6 *   address_in6;

    in_addr_t *         dest;

    in_addr_t *         src;

    int                 phone;

    // addresses in the host byte order

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

    addrlen = packet_get_addr( packet, NULL, ( uint8_t ** ) & addr );

    if( addrlen < 0 ){

        return ip_release_and_return( packet, addrlen );

    }

    if( addrlen < sizeof( struct sockaddr )){

        return ip_release_and_return( packet, EINVAL );

    }

    switch( addr->sa_family ){

        case AF_INET:

            if( addrlen != sizeof( struct sockaddr_in )){

                return ip_release_and_return( packet, EINVAL );

            }

            address_in = ( struct sockaddr_in * ) addr;

            dest = & address_in->sin_addr;

            break;

        // TODO IPv6

/*      case AF_INET6:

            if( addrlen != sizeof( struct sockaddr_in6 )) return EINVAL;

            address_in6 = ( struct sockaddr_in6 * ) dest;

            address_in6.sin6_addr.s6_addr;

*/      default:

            return ip_release_and_return( packet, EAFNOSUPPORT );

    }

    fibril_rwlock_read_lock( & ip_globals.netifs_lock );

    // device specified?

    if( device_id > 0 ){

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

        route = ip_netif_find_route( netif, * dest );

    }else{

        route = ip_find_route( * dest );

        netif = route ? route->netif : NULL;

    }

    if( !( netif && route )){

        fibril_rwlock_read_unlock( & ip_globals.netifs_lock );

        phone = ip_prepare_icmp_and_get_phone( error, packet, NULL );

        if( phone >= 0 ){

            // unreachable ICMP if no routing

            icmp_destination_unreachable_msg( phone, ICMP_NET_UNREACH, 0, packet );

        }

        return ENOENT;

    }

    if( error ){

        // do not send for broadcast, anycast packets or network broadcast

        if(( ! dest->s_addr )

        || ( !( ~ dest->s_addr ))

        || ( !( ~(( dest->s_addr & ( ~ route->netmask.s_addr )) | route->netmask.s_addr )))

        || ( !( dest->s_addr & ( ~ route->netmask.s_addr )))){

            return ip_release_and_return( packet, EINVAL );

        }

    }

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

        // find the loopback device to deliver

        dest->s_addr = IPV4_LOCALHOST_ADDRESS;

        route = ip_find_route( * dest );

        netif = route ? route->netif : NULL;

        if( !( netif && route )){

            fibril_rwlock_read_unlock( & ip_globals.netifs_lock );

            phone = ip_prepare_icmp_and_get_phone( error, packet, NULL );

            if( phone >= 0 ){

                // unreachable ICMP if no routing

                icmp_destination_unreachable_msg( phone, ICMP_HOST_UNREACH, 0, packet );

            }

            return ENOENT;

        }

    }

    src = ip_netif_address( netif );

    if( ! src ){

        fibril_rwlock_read_unlock( & ip_globals.netifs_lock );

        return ip_release_and_return( packet, ENOENT );

    }

    ERROR_CODE = ip_send_route( packet, netif, route, src, * dest, error );

    fibril_rwlock_read_unlock( & ip_globals.netifs_lock );

    return ERROR_CODE;

}

in_addr_t * ip_netif_address( 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, services_t error ){

    ERROR_DECLARE;

    measured_string_t   destination;

    measured_string_ref translation;

    char *              data;

    int                 phone;

    // get destination hardware address

    if( netif->arp && ( route->address.s_addr != dest.s_addr )){

        destination.value = route->gateway.s_addr ? ( char * ) & route->gateway.s_addr : ( 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 ))){

//          sleep( 1 );

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

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

            return ERROR_CODE;

        }

        if( !( translation && translation->value )){

            if( translation ){

                free( translation );

                free( data );

            }

            phone = ip_prepare_icmp_and_get_phone( error, packet, NULL );

            if( phone >= 0 ){

                // unreachable ICMP if no routing

                icmp_destination_unreachable_msg( phone, ICMP_HOST_UNREACH, 0, packet );

            }

            return EINVAL;

        }

    }else translation = NULL;

    if( ERROR_OCCURRED( ip_prepare_packet( src, dest, packet, translation ))){

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

    }else{

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

        if( packet ){

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

        }

    }

    if( translation ){

        free( translation );

        free( data );

    }

    return ERROR_CODE;

}

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

    ERROR_DECLARE;

    size_t              length;

    ip_header_ref       header;

    ip_header_ref       last_header;

    ip_header_ref       middle_header;

    packet_t            next;

    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 )));

    }else{

        ERROR_PROPAGATE( packet_set_addr( packet, NULL, NULL, 0 ));

    }

    header->version = IPV4;

    header->fragment_offset = 0;

    header->header_checksum = 0;

    if( source ) header->source_address = source->s_addr;

    header->destination_address = dest.s_addr;

    fibril_rwlock_write_lock( & ip_globals.lock );

    ++ ip_globals.packet_counter;

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

    fibril_rwlock_write_unlock( & ip_globals.lock );

    length = packet_get_data_length( packet );

    if( pq_next( packet )){

        last_header = ( ip_header_ref ) malloc( IP_HEADER_LENGTH( header ));

        if( ! last_header ) return ENOMEM;

        ip_create_last_header( last_header, header );

        next = pq_next( packet );

        while( pq_next( next )){

            middle_header = ( ip_header_ref ) packet_prefix( next, IP_HEADER_LENGTH( last_header ));

            if( ! middle_header ) return ENOMEM;

            memcpy( middle_header, last_header, IP_HEADER_LENGTH( last_header ));

            header->flags |= IPFLAG_MORE_FRAGMENTS;

            middle_header->total_length = htons( packet_get_data_length( next ));

            middle_header->fragment_offset = IP_COMPUTE_FRAGMENT_OFFSET( length );

            middle_header->header_checksum = IP_HEADER_CHECKSUM( middle_header );

            if( destination ){

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

            }

            length += packet_get_data_length( next );

            next = pq_next( next );

        }

        middle_header = ( ip_header_ref ) packet_prefix( next, IP_HEADER_LENGTH( last_header ));

        if( ! middle_header ) return ENOMEM;

        memcpy( middle_header, last_header, IP_HEADER_LENGTH( last_header ));

        middle_header->total_length = htons( packet_get_data_length( next ));

        middle_header->fragment_offset = IP_COMPUTE_FRAGMENT_OFFSET( length );

        middle_header->header_checksum = IP_HEADER_CHECKSUM( middle_header );

        if( destination ){

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

        }

        length += packet_get_data_length( next );

        free( last_header );

        header->flags |= IPFLAG_MORE_FRAGMENTS;

    }

    header->total_length = htons( length );

    // 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;

    struct sockaddr *       addr;

    size_t                  addrlen;

    ip_pseudo_header_ref    header;