udpout.c

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/*
 * Copyright (C) 2001-2003 by egnite Software GmbH. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
 * ``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 EGNITE
 * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * For additional information see http://www.ethernut.de/
 *
 * -
 * Portions Copyright (C) 2000 David J. Hudson <dave@humbug.demon.co.uk>
 *
 * This file is distributed in the hope that it will be useful, but WITHOUT
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 * FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You can redistribute this file and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software Foundation;
 * either version 2 of the License, or (at your discretion) any later version.
 * See the accompanying file "copying-gpl.txt" for more details.
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 * As a special exception to the GPL, permission is granted for additional
 * uses of the text contained in this file.  See the accompanying file
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 * -
 * Portions Copyright (c) 1983, 1993 by
 *  The Regents of the University of California.  All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * 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.
 * -
 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
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 */

/*
 * $Log$
 * Revision 1.4  2008/08/11 07:00:33  haraldkipp
 * BSD types replaced by stdint types (feature request #1282721).
 *
 * Revision 1.3  2008/04/18 13:32:00  haraldkipp
 * Changed size parameter from u_short to int, which is easier to handle
 * for 32-bit targets. You need to recompile your ARM code. No impact on
 * AVR expected
 * I changed u_int to int at some places to avoid some warnings during
 * compilation of Nut/Net.
 * libs.
 *
 * Revision 1.2  2005/08/02 17:47:03  haraldkipp
 * Major API documentation update.
 *
 * Revision 1.1.1.1  2003/05/09 14:41:45  haraldkipp
 * Initial using 3.2.1
 *
 * Revision 1.12  2003/03/31 14:53:28  harald
 * Prepare release 3.1
 *
 * Revision 1.11  2003/02/04 18:14:57  harald
 * Version 3 released
 *
 * Revision 1.10  2002/06/26 17:29:36  harald
 * First pre-release with 2.4 stack
 *
 */

#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <netinet/ipcsum.h>
#include <net/route.h>
#include <sys/socket.h>


int NutUdpOutput(UDPSOCKET * sock, uint32_t daddr, uint16_t port, NETBUF * nb)
{
    uint32_t saddr;
    uint32_t csum;
    UDPHDR *uh;
    NUTDEVICE *dev;
    IFNET *nif;

    if ((nb = NutNetBufAlloc(nb, NBAF_TRANSPORT, sizeof(UDPHDR))) == 0)
        return -1;

    uh = nb->nb_tp.vp;
    uh->uh_sport = sock->so_local_port;
    uh->uh_dport = htons(port);
    uh->uh_ulen = htons((uint16_t)(nb->nb_tp.sz + nb->nb_ap.sz));

    /*
     * Get local address for this destination.
     */
    if ((dev = NutIpRouteQuery(daddr, &saddr)) != 0) {
        nif = dev->dev_icb;
        saddr = nif->if_local_ip;
    } else
        saddr = 0;

    uh->uh_sum = 0;
    csum = NutIpPseudoChkSumPartial(saddr, daddr, IPPROTO_UDP, uh->uh_ulen);
    csum = NutIpChkSumPartial(csum, uh, sizeof(UDPHDR));
    uh->uh_sum = NutIpChkSum(csum, nb->nb_ap.vp, nb->nb_ap.sz);

    return NutIpOutput(IPPROTO_UDP, daddr, nb);
}