source: mainline/uspace/srv/net/il/ip/ip_client.c@ f1848d6

/*
 * 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 client interface implementation.
 *  @see ip_client.h
 */

#include <errno.h>

#include <sys/types.h>

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

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

#include "ip_header.h"

int ip_client_prepare_packet( packet_t packet, ip_protocol_t protocol, ip_ttl_t ttl, ip_tos_t tos, int dont_fragment, size_t ipopt_length ){
        ip_header_ref   header;
        uint8_t *               data;
        size_t                  padding;

        padding =  ipopt_length % 4;
        if( padding ){
                padding = 4 - padding;
                ipopt_length += padding;
        }
        data = ( uint8_t * ) packet_prefix( packet, sizeof( ip_header_t ) + padding );
        if( ! data ) return ENOMEM;
        while( padding -- ) data[ sizeof( ip_header_t ) + padding ] = IPOPT_NOOP;
        header = ( ip_header_ref ) data;
        header->header_length = IP_COMPUTE_HEADER_LENGTH( sizeof( ip_header_t ) + ipopt_length );
        header->ttl = ( ttl ? ttl : IPDEFTTL ); //((( ttl ) <= MAXTTL ) ? ttl : MAXTTL ) : IPDEFTTL;
        header->tos = tos;
        header->protocol = protocol;
        if( dont_fragment ) header->flags = IPFLAG_DONT_FRAGMENT;
        return EOK;
}

int ip_client_process_packet( packet_t packet, ip_protocol_t * protocol, ip_ttl_t * ttl, ip_tos_t * tos, int * dont_fragment, size_t * ipopt_length ){
        ip_header_ref   header;

        header = ( ip_header_ref ) packet_get_data( packet );
        if(( ! header )
        || ( packet_get_data_length( packet ) < sizeof( ip_header_t ))){
                return ENOMEM;
        }
        if( protocol ) * protocol = header->protocol;
        if( ttl ) * ttl = header->ttl;
        if( tos ) * tos = header->tos;
        if( dont_fragment ) * dont_fragment = header->flags & IPFLAG_DONT_FRAGMENT;
        if( ipopt_length ){
                * ipopt_length = IP_HEADER_LENGTH( header ) - sizeof( ip_header_t );
                return sizeof( ip_header_t );
        }else{
                return IP_HEADER_LENGTH( header );
        }
}

size_t ip_client_header_length( packet_t packet ){
        ip_header_ref   header;

        header = ( ip_header_ref ) packet_get_data( packet );
        if(( ! header )
        || ( packet_get_data_length( packet ) < sizeof( ip_header_t ))){
                return 0;
        }
        return IP_HEADER_LENGTH( header );
}

int ip_client_set_pseudo_header_data_length( ip_pseudo_header_ref header, size_t headerlen, size_t data_length ){
        ipv4_pseudo_header_ref  header_in;

        if( ! header ) return EBADMEM;
        if( headerlen == sizeof( ipv4_pseudo_header_t )){
                header_in = ( ipv4_pseudo_header_ref ) header;
                header_in->data_length = htons( data_length );
                return EOK;
        }else{
                return EINVAL;
        }
}

int ip_client_get_pseudo_header( ip_protocol_t protocol, struct sockaddr * src, socklen_t srclen, struct sockaddr * dest, socklen_t destlen, size_t data_length, ip_pseudo_header_ref * header, size_t * headerlen ){
        ipv4_pseudo_header_ref  header_in;
        struct sockaddr_in *    address_in;

        if( !( header && headerlen )) return EBADMEM;
        if( !( src && dest && ( srclen > 0 ) && (( size_t ) srclen >= sizeof( struct sockaddr )) && ( srclen == destlen ) && ( src->sa_family == dest->sa_family ))) return EINVAL;
        switch( src->sa_family ){
                case AF_INET:
                        if( srclen != sizeof( struct sockaddr_in )) return EINVAL;
                        * headerlen = sizeof( * header_in );
                        header_in = ( ipv4_pseudo_header_ref ) malloc( * headerlen );
                        if( ! header_in ) return ENOMEM;
                        bzero( header_in, * headerlen );
                        address_in = ( struct sockaddr_in * ) dest;
                        header_in->destination_address = address_in->sin_addr.s_addr;
                        address_in = ( struct sockaddr_in * ) src;
                        header_in->source_address = address_in->sin_addr.s_addr;
                        header_in->protocol = protocol;
                        header_in->data_length = htons( data_length );
                        * header = ( ip_pseudo_header_ref ) header_in;
                        return EOK;
                // TODO IPv6
/*              case AF_INET6:
                        if( addrlen != sizeof( struct sockaddr_in6 )) return EINVAL;
                        address_in6 = ( struct sockaddr_in6 * ) addr;
                        return EOK;
*/              default:
                        return EAFNOSUPPORT;
        }
}

/** @}
 */