/* fddi.c

   Packet assembly code, originally contributed by Archie Cobbs. */

/*
 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
 * Copyright (c) 1996-2003 by Internet Software Consortium
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 *   Internet Systems Consortium, Inc.
 *   950 Charter Street
 *   Redwood City, CA 94063
 *   <info@isc.org>
 *   http://www.isc.org/
 *
 * This software has been written for Internet Systems Consortium
 * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
 * To learn more about Internet Systems Consortium, see
 * ``http://www.isc.org/''.  To learn more about Vixie Enterprises,
 * see ``http://www.vix.com''.   To learn more about Nominum, Inc., see
 * ``http://www.nominum.com''.
 */

#ifndef lint
static char copyright[] =
"$Id: fddi.c,v 1.5 2005/08/11 17:13:21 drochner Exp $ Copyright (c) 2004 Internet Systems Consortium.  All rights reserved.\n";
#endif /* not lint */

#include "dhcpd.h"

#if defined (DEC_FDDI) || defined (NETBSD_FDDI)
#if defined (DEC_FDDI)
#include <netinet/if_fddi.h>
#include <net/if_llc.h>
#endif /* DEC_FDDI */

#if defined (NETBSD_FDDI)
#include <net/if_fddi.h>
#include <net/if_llc.h>
#define LLC_SNAP_LEN LLC_SNAPFRAMELEN
#endif /* NETBSD_FDDI */

#if defined (PACKET_ASSEMBLY) || defined (PACKET_DECODING)
#include "includes/netinet/if_ether.h"
#endif /* PACKET_ASSEMBLY || PACKET_DECODING */

#if defined (PACKET_ASSEMBLY)
/* Assemble an hardware header... */

void assemble_fddi_header (struct interface_info *interface,
	unsigned char *buf, unsigned *bufix, struct hardware *to)
{
	struct fddi_header   fh;
	struct llc     lh;

	if (to && to -> hlen == 7)
		memcpy (fh.fddi_dhost, &to -> hbuf [1],
			sizeof (fh.fddi_dhost));
	memcpy (fh.fddi_shost,
		&interface -> hw_address.hbuf [1], sizeof (fh.fddi_shost));
	fh.fddi_fc = FDDIFC_LLC_ASYNC;
	memcpy (&buf [*bufix], &fh, sizeof fh);
	*bufix += sizeof fh;

	memset (&lh, 0, sizeof lh);
	lh.llc_dsap = LLC_SNAP_LSAP;
	lh.llc_ssap = LLC_SNAP_LSAP;
	lh.llc_un.type_snap.control = LLC_UI;
	lh.llc_un.type_snap.ether_type = htons (ETHERTYPE_IP);
	memcpy (&buf [*bufix], &lh, LLC_SNAP_LEN);
	*bufix += LLC_SNAP_LEN;
}
#endif /* PACKET_ASSEMBLY */

#ifdef PACKET_DECODING
/* Decode a hardware header... */

ssize_t decode_fddi_header (struct interface_info *interface,
     unsigned char *buf, unsigned bufix, struct hardware *from)
{
	struct fddi_header   fh;

	memcpy(&fh, buf + bufix, FDDI_HEADER_SIZE);

	from -> hbuf [0] = HTYPE_FDDI;
	from -> hlen = (sizeof fh.fddi_shost) + 1;
	memcpy (&from -> hbuf [1], fh.fddi_shost, sizeof fh.fddi_shost);
	return FDDI_HEADER_SIZE + LLC_SNAP_LEN;
}
#endif /* PACKET_DECODING */
#endif /* DEC_FDDI || NETBSD_FDDI */