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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 "../../include/socket_errno.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->header_length = IP_COMPUTE_HEADER_LENGTH( sizeof( ip_header_t ) + ipopt_length );
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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 = IP_HEADER_LENGTH( header ) - sizeof( ip_header_t );
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        return sizeof( ip_header_t );
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    }else{
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        return IP_HEADER_LENGTH( header );
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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 IP_HEADER_LENGTH( header );
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}
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int ip_client_set_pseudo_header_data_length( ip_pseudo_header_ref header, size_t headerlen, size_t data_length ){
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    ipv4_pseudo_header_ref  header_in;
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    if( headerlen == sizeof( ipv4_pseudo_header_t )){
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        header_in = ( ipv4_pseudo_header_ref ) header;
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        header_in->data_length = htons( data_length );
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        return EOK;
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    }else{
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        return EINVAL;
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    }
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}
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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 ){
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    ipv4_pseudo_header_ref  header_in;
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    struct sockaddr_in *    address_in;
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    if( !( header && headerlen )) return EBADMEM;
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    if( !( src && dest && ( srclen > 0 ) && (( size_t ) srclen >= sizeof( struct sockaddr )) && ( srclen == destlen ) && ( src->sa_family == dest->sa_family ))) return EINVAL;
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    switch( src->sa_family ){
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        case AF_INET:
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            if( srclen != sizeof( struct sockaddr_in )) return EINVAL;
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            * headerlen = sizeof( * header_in );
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            header_in = ( ipv4_pseudo_header_ref ) malloc( * headerlen );
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            if( ! header_in ) return ENOMEM;
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            bzero( header_in, * headerlen );
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            address_in = ( struct sockaddr_in * ) dest;
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            header_in->destination_address = address_in->sin_addr.s_addr;
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            address_in = ( struct sockaddr_in * ) src;
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            header_in->source_address = address_in->sin_addr.s_addr;
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            header_in->protocol = protocol;
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            header_in->data_length = htons( data_length );
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            * header = ( ip_pseudo_header_ref ) header_in;
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            return EOK;
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        // TODO IPv6
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/*      case AF_INET6:
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            if( addrlen != sizeof( struct sockaddr_in6 )) return EINVAL;
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            address_in6 = ( struct sockaddr_in6 * ) addr;
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            return EOK;
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*/      default:
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            return EAFNOSUPPORT;
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    }
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}
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/** @}
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 */