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      1 /*	$NetBSD: fddi.c,v 1.3 2022/04/03 01:10:58 christos Exp $	*/
      2 
      3 /* fddi.c
      4 
      5    Packet assembly code, originally contributed by Archie Cobbs. */
      6 
      7 /*
      8  * Copyright (C) 2004-2022 Internet Systems Consortium, Inc. ("ISC")
      9  * Copyright (c) 1996-2003 by Internet Software Consortium
     10  *
     11  * This Source Code Form is subject to the terms of the Mozilla Public
     12  * License, v. 2.0. If a copy of the MPL was not distributed with this
     13  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
     16  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     17  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
     18  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     19  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     20  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
     21  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     22  *
     23  *   Internet Systems Consortium, Inc.
     24  *   PO Box 360
     25  *   Newmarket, NH 03857 USA
     26  *   <info (at) isc.org>
     27  *   https://www.isc.org/
     28  *
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __RCSID("$NetBSD: fddi.c,v 1.3 2022/04/03 01:10:58 christos Exp $");
     33 
     34 #include "dhcpd.h"
     35 
     36 #if defined (DEC_FDDI)
     37 #include <netinet/if_fddi.h>
     38 #include <net/if_llc.h>
     39 
     40 #if defined (PACKET_ASSEMBLY) || defined (PACKET_DECODING)
     41 #include "includes/netinet/if_ether.h"
     42 #endif /* PACKET_ASSEMBLY || PACKET_DECODING */
     43 
     44 #if defined (PACKET_ASSEMBLY)
     45 /* Assemble an hardware header... */
     46 
     47 void assemble_fddi_header (interface, buf, bufix, to)
     48 	struct interface_info *interface;
     49 	unsigned char *buf;
     50 	unsigned *bufix;
     51 	struct hardware *to;
     52 {
     53 	struct fddi_header   fh;
     54 	struct llc     lh;
     55 
     56 	if (to && to -> hlen == 7)
     57 		memcpy (fh.fddi_dhost, &to -> hbuf [1],
     58 			sizeof (fh.fddi_dhost));
     59 	memcpy (fh.fddi_shost,
     60 		&interface -> hw_address.hbuf [1], sizeof (fh.fddi_shost));
     61 	fh.fddi_fc = FDDIFC_LLC_ASYNC;
     62 	memcpy (&buf [*bufix], &fh, sizeof fh);
     63 	*bufix += sizeof fh;
     64 
     65 	lh.llc_dsap = LLC_SNAP_LSAP;
     66 	lh.llc_ssap = LLC_SNAP_LSAP;
     67 	lh.llc_un.type_snap.control = LLC_UI;
     68 	lh.llc_un.type_snap.ether_type = htons (ETHERTYPE_IP);
     69 	memcpy (&buf [*bufix], &lh, LLC_SNAP_LEN);
     70 	*bufix += LLC_SNAP_LEN;
     71 }
     72 #endif /* PACKET_ASSEMBLY */
     73 
     74 #ifdef PACKET_DECODING
     75 /* Decode a hardware header... */
     76 
     77 ssize_t decode_fddi_header (interface, buf, bufix, from)
     78      struct interface_info *interface;
     79      unsigned char *buf;
     80      unsigned bufix;
     81      struct hardware *from;
     82 {
     83 	struct fddi_header   fh;
     84 	struct llc     lh;
     85 
     86 	from -> hbuf [0] = HTYPE_FDDI;
     87 	memcpy (&from -> hbuf [1], fh.fddi_shost, sizeof fh.fddi_shost);
     88 	return FDDI_HEADER_SIZE + LLC_SNAP_LEN;
     89 }
     90 #endif /* PACKET_DECODING */
     91 #endif /* DEC_FDDI */
     92