arpout.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
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 *
 * 1. Redistributions of source code must retain the above copyright
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 * 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.
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 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
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 * For additional information see http://www.ethernut.de/
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 * -
 * Portions Copyright (C) 2000 David J. Hudson <dave@humbug.demon.co.uk>
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 * modification, are permitted provided that the following conditions
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 * 2. Redistributions in binary form must reproduce the above copyright
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 * 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
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/*
 * $Log$
 * Revision 1.3  2008/08/11 07:00:29  haraldkipp
 * BSD types replaced by stdint types (feature request #1282721).
 *
 * Revision 1.2  2005/04/08 15:20:50  olereinhardt
 * added <sys/types.h> (__APPLE__) and <netinet/in.h> (__linux__)
 * for htons and simmilar.
 *
 * Revision 1.1.1.1  2003/05/09 14:41:27  haraldkipp
 * Initial using 3.2.1
 *
 * Revision 1.11  2003/03/31 11:54:51  harald
 * Avoid including PPP code unless required
 *
 * Revision 1.10  2003/02/04 18:14:56  harald
 * Version 3 released
 *
 * Revision 1.9  2002/06/26 17:29:35  harald
 * First pre-release with 2.4 stack
 *
 */

#include <string.h>

#include <sys/heap.h>
#include <sys/thread.h>
#include <sys/types.h>
#include <net/if_var.h>
#include <netinet/if_ether.h>
#include <net/ether.h>
#include <netinet/in.h>

NETBUF *NutArpAllocNetBuf(uint16_t type, uint32_t ip, uint8_t * mac)
{
    NETBUF *nb;
    ETHERARP *ea;
    ARPHDR *ah;

    if ((nb = NutNetBufAlloc(0, NBAF_NETWORK, sizeof(ETHERARP))) == 0)
        return 0;

    ea = nb->nb_nw.vp;
    ah = (ARPHDR *) & ea->ea_hdr;

    /*
     * Set ARP header.
     */
    ah->ar_hrd = htons(ARPHRD_ETHER);
    ah->ar_pro = htons(ETHERTYPE_IP);
    ah->ar_hln = 6;
    ah->ar_pln = 4;
    ah->ar_op = htons(type);

    /*
     * Set ARP destination data.
     */
    if (mac)
        memcpy(ea->arp_tha, mac, 6);
    else
        memset(ea->arp_tha, 0xff, 6);
    ea->arp_tpa = ip;

    return nb;
}

int NutArpOutput(NUTDEVICE * dev, NETBUF * nb)
{
    ETHERARP *ea;
    IFNET *nif;

    ea = nb->nb_nw.vp;

    /*
     * Set ARP source data.
     */
    nif = dev->dev_icb;
    memcpy(ea->arp_sha, nif->if_mac, 6);
    ea->arp_spa = nif->if_local_ip;

    return (*nif->if_output)(dev, ETHERTYPE_ARP, ea->arp_tha, nb);
}