source: mainline/uspace/lib/net/il/ip_client.c@ d9e2e0e

/*
 * 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 <ip_client.h>
#include <packet/packet.h>
#include <packet/packet_client.h>
#include <ip_header.h>

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_get_pseudo_header(ip_protocol_t protocol, struct sockaddr * src, socklen_t srclen, struct sockaddr * dest, socklen_t destlen, size_t data_length, void **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 = 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;
        }
}

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;

        // compute the padding if IP options are set
        // multiple of 4 bytes
        padding =  ipopt_length % 4;
        if(padding){
                padding = 4 - padding;
                ipopt_length += padding;
        }

        // prefix the header
        data = (uint8_t *) packet_prefix(packet, sizeof(ip_header_t) + padding);
        if(! data){
                return ENOMEM;
        }

        // add the padding
        while(padding --){
                data[sizeof(ip_header_t) + padding] = IPOPT_NOOP;
        }

        // set the header
        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);
        }
}

int ip_client_set_pseudo_header_data_length(void *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;
        // TODO IPv6
        }else{
                return EINVAL;
        }
}

/** @}
 */