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4505 mejdrech 1
/*
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 * Copyright (c) 2009 Lukas Mejdrech
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup ip
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 *  @{
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 */
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/** @file
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 *  IP client interface implementation.
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 *  @see ip_client.h
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 */
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#include <errno.h>
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#include <sys/types.h>
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#include "../../include/ip_client.h"
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#include "../../structures/packet/packet.h"
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#include "../../structures/packet/packet_client.h"
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#include "ip_header.h"
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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 ){
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    ip_header_ref   header;
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    uint8_t *       data;
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    size_t          padding;
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    padding =  ipopt_length % 4;
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    if( padding ){
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        padding = 4 - padding;
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        ipopt_length += padding;
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    }
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    data = ( uint8_t * ) packet_prefix( packet, sizeof( ip_header_t ) + padding );
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    if( ! data ) return ENOMEM;
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    while( padding -- ) data[ sizeof( ip_header_t ) + padding ] = IPOPT_NOOP;
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    header = ( ip_header_ref ) data;
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    header->ihl = ( uint8_t ) ( sizeof( ip_header_t ) + ipopt_length ) / 4;
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    header->ttl = ttl ? (( ttl <= MAXTTL ) ? ttl : MAXTTL ) : IPDEFTTL;
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    header->tos = tos;
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    header->protocol = protocol;
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    if( dont_fragment ) header->flags = IPFLAG_DONT_FRAGMENT;
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    return EOK;
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}
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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 ){
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    ip_header_ref   header;
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    header = ( ip_header_ref ) packet_get_data( packet );
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    if(( ! header )
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    || ( packet_get_data_length( packet ) < sizeof( ip_header_t ))){
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        return ENOMEM;
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    }
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    if( protocol ) * protocol = header->protocol;
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    if( ttl ) * ttl = header->ttl;
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    if( tos ) * tos = header->tos;
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    if( dont_fragment ) * dont_fragment = header->flags & IPFLAG_DONT_FRAGMENT;
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    if( ipopt_length ){
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        * ipopt_length = header->ihl * 4 - sizeof( ip_header_t );
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        return sizeof( ip_header_t );
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    }else{
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        return header->ihl * 4;
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    }
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}
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size_t ip_client_header_length( packet_t packet ){
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    ip_header_ref   header;
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    header = ( ip_header_ref ) packet_get_data( packet );
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    if(( ! header )
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    || ( packet_get_data_length( packet ) < sizeof( ip_header_t ))){
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        return 0;
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    }
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    return header->ihl * 4u;
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}
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/** @}
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 */