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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 ));

	if( ! new_packet ) return ENOMEM;

	last_header = ip_create_last_header( new_packet, header );

	if( ! last_header ){

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

		return ENOMEM;

	}

	// biggest multiple of 8 lower than content

	// TODO even fragmentation?

	length = length & ( ~ 0x7 );// ( content / 8 ) * 8

	if( ERROR_OCCURRED( ip_fragment_packet_data( packet, new_packet, header, last_header, (( IP_TOTAL_LENGTH( header ) - length ) % ( length - IP_HEADER_LENGTH( last_header ))), src, dest, address_length ))){

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

		return ERROR_CODE;

	}

	// mark the first as fragmented

	header->flags |= IPFLAG_MORE_FRAGMENTS;

	// create middle framgents

	while( IP_TOTAL_LENGTH( header ) > length ){

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

		if( ! new_packet ) return ENOMEM;

		middle_header = ip_create_middle_header( new_packet, last_header );

		if( ! middle_header ){

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

			return ENOMEM;

		}

		if( ERROR_OCCURRED( ip_fragment_packet_data( packet, new_packet, header, middle_header, length - IP_HEADER_LENGTH( middle_header ), src, dest, address_length ))){

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

			return ERROR_CODE;

		}

	}

	// finish the first fragment

	header->header_checksum = IP_HEADER_CHECKSUM( header );

	printf( "ok\n" );

	return EOK;

}

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 ){

	ERROR_DECLARE;

	void *			data;

	data = packet_suffix( new_packet, length );

	if( ! data ) return ENOMEM;

	memcpy( data, (( void * ) header ) + IP_TOTAL_LENGTH( header ) - length, length );

	ERROR_PROPAGATE( packet_trim( packet, 0, length ));

	header->total_length = htons( IP_TOTAL_LENGTH( header ) - length );

	new_header->total_length = htons( IP_HEADER_LENGTH( new_header ) + length );

	new_header->fragment_offset = header->fragment_offset + IP_HEADER_DATA_LENGTH( header ) / 8;

	new_header->header_checksum = IP_HEADER_CHECKSUM( new_header );

	ERROR_PROPAGATE( packet_set_addr( new_packet, src, dest, address_length ));

	return pq_insert_after( packet, new_packet );

}

ip_header_ref ip_create_middle_header( packet_t packet, ip_header_ref last ){

	ip_header_ref	middle;

	middle = ( ip_header_ref ) packet_suffix( packet, IP_HEADER_LENGTH( last ));

	if( ! middle ) return NULL;

	memcpy( middle, last, IP_HEADER_LENGTH( last ));

	middle->flags |= IPFLAG_MORE_FRAGMENTS;

	return middle;

}

ip_header_ref ip_create_last_header( packet_t packet, ip_header_ref first ){

	ip_header_ref	last;

	ip_option_ref	option;

	size_t			next;

	size_t			length;

	// allocate as much as originally

	last = ( ip_header_ref ) packet_suffix( packet, IP_HEADER_LENGTH( first ));

	if( ! last ) return NULL;

	// copy first itself

	memcpy( last, first, sizeof( ip_header_t ));

	length = sizeof( ip_header_t );

	next = sizeof( ip_header_t );

	// process all ip options

	while( next < first->ihl ){

		option = ( ip_option_ref ) ((( void * ) first ) + next );

		// skip end or noop

		if(( option->type == IPOPT_END ) || ( option->type == IPOPT_NOOP )){

			++ next;

		}else{

			// copy if said so or skip

			if( IPOPT_COPIED( option->type )){

				memcpy((( void * ) last ) + length, (( void * ) first ) + next, option->length );

				length += option->length;

			}

			// next option

			next += option->length;

		}

	}

	// align 4 byte boundary

	if( length % 4 ){

		bzero((( void * ) last ) + length, 4 - ( length % 4 ));

		last->ihl = length / 4 + 1;

	}else{

		last->ihl = length / 4;

	}

	// trim the unused space

	if( packet_trim( packet, 0, IP_HEADER_LENGTH( first ) - IP_HEADER_LENGTH( last )) != EOK ) return NULL;

	return last;

}

int ip_received_msg( device_id_t device_id, packet_t packet ){

	packet_t		next;

	do{

		next = pq_detach( packet );

		if( ip_process_packet( device_id, packet ) != EOK ){

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

		}

		packet = next;

	}while( packet );

	return EOK;

}

int ip_process_packet( device_id_t device_id, packet_t packet ){

	ERROR_DECLARE;

	ip_header_ref	header;

	in_addr_t		dest;

	ip_route_ref	route;

	header = ( ip_header_ref ) packet_get_data( packet );

	if( ! header ) return ENOMEM;

	// checksum

	if(( header->header_checksum ) && ( IP_HEADER_CHECKSUM( header ))){

		// TODO checksum error ICMP?

		return EINVAL;

	}

	// TODO ttl oxceeded ICMP?

	if( !( -- header->ttl )) return EINVAL;

	// process ipopt and get destination

	dest = ip_get_destination( header );

	ERROR_PROPAGATE( packet_set_addr( packet, NULL, ( uint8_t * ) & dest.s_addr, IP_ADDR ));

	route = ip_find_route( dest );

	// TODO unreachable ICMP?

	if( ! route ) return ENOENT;

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

		// local delivery

		return ip_deliver_local( device_id, packet, header );

	}else{

		return ip_send_route( packet, route->netif, route, NULL, dest );

	}

}

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

	ERROR_DECLARE;

	ip_proto_ref	proto;

	if(( header->flags & IPFLAG_MORE_FRAGMENTS ) || header->fragment_offset ){

		// TODO fragmented

		return ENOTSUP;

	}else{

		proto = ip_protos_find( & ip_globals.protos, header->protocol );

		if( ! proto ) return ENOENT;

		ERROR_PROPAGATE( packet_set_addr( packet, ( uint8_t * ) & header->source_address, ( uint8_t * ) & header->destination_address, IP_ADDR ));

		if( proto->tl_received_msg ){

			return proto->tl_received_msg( device_id, packet, SERVICE_IP );

		}else{

			return tl_received_msg( proto->phone, device_id, packet, proto->service );

		}

	}

}

in_addr_t ip_get_destination( ip_header_ref header ){

	in_addr_t	destination;

	// TODO search set ipopt route?

	destination.s_addr = header->destination_address; //ntohl( header->destination_address );

	return destination;

}

/** @}

 */