/* packet-isis.h
 * Defines and such for core isis protcol decode.
 *
 * $Id: packet-isis.h,v 1.4 2000/04/17 01:36:31 guy Exp $
 * Stuart Stanley <stuarts@mxmail.net>
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@zing.org>
 * Copyright 1998 Gerald Combs
 *
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 *
 */

#ifndef _PACKET_ISIS_H
#define _PACKET_ISIS_H

/*
 * The version we support is 1
 */
#define ISIS_REQUIRED_VERSION 1

/*
 * ISIS type field values
 */
#define ISIS_TYPE_L1_HELLO  15
#define ISIS_TYPE_L2_HELLO  16
#define ISIS_TYPE_PTP_HELLO 17
#define ISIS_TYPE_L1_LSP    18
#define ISIS_TYPE_L2_LSP    20
#define ISIS_TYPE_L1_CSNP   24
#define ISIS_TYPE_L2_CSNP   25
#define ISIS_TYPE_L1_PSNP   26
#define ISIS_TYPE_L2_PSNP   27

#define ISIS_TYPE_MASK 	    0x1f
#define ISIS_R8_MASK	    0x80
#define ISIS_R7_MASK	    0x40
#define ISIS_R6_MASK	    0x20

/*
 * The common first 8 octets of the ISIS protocol header.
 */
typedef struct {
  guint8 isis_irpd;  /* Intradomain Routing Protocol Descriminator: 0x83 */
  guint8 isis_header_length;  /* header length in octets */
  guint8 isis_version;        /* isis version, must be 0x01 */
  guint8 isis_system_id_len;  /* length of the system ID fields */
  guint8 isis_type_reserved;  /* packet type & reserved */
  guint8 isis_version2;	      /* another version(?!), must be 0x01 */
  guint8 isis_reserved;	      /* reserved, must be 0 */
  guint8 isis_max_area_adr;   /* Maximum Number of AREA Addresses permitted */
} isis_hdr_t;                 /* for this AREA. Value of 0 allows 3 Addresses */

#define isis_type isis_type_reserved&ISIS_TYPE_MASK
#define isis_r8   isis_type_reserved&ISIS_R8_MASK
#define isis_r7   isis_type_reserved&ISIS_R7_MASK
#define isis_r6   isis_type_reserved&ISIS_R6_MASK


/*
 * published API functions
 */

extern char *isis_address_to_string ( const u_char *pd, int offset, int len );
extern void isis_dissect_unknown( int offset, guint length, proto_tree *tree,
                                  frame_data *fd, char *fmat, ...);

#endif /* _PACKET_ISIS_H */