/*
 * AS path related definitions.
 * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra 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, or (at your option) any
 * later version.
 *
 * GNU Zebra 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 GNU Zebra; see the file COPYING.  If not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.  
 */

#ifndef _ZEBRA_BGP_ASPATH_H
#define _ZEBRA_BGP_ASPATH_H

/* AS path segment type. */
#define AS_SET             1
#define AS_SEQUENCE        2

/* Use draft-ietf-idr-bgp-confed-rfc1965bis-01.txt value.  */
#define AS_CONFED_SEQUENCE 3
#define AS_CONFED_SET      4

/* AS path may be include some AsSegments. */
struct aspath 
{
  /* Reference count to this aspath. */
  unsigned long refcnt;

  /* Rawdata length */
  int length;

  /* AS count. */
  int count;

  /* Rawdata */
  caddr_t data;

  /* String expression of AS path.  This string is used by vty output
     and AS path regular expression match. */
  char *str;
};

#define ASPATH_STR_DEFAULT_LEN 32

/* Prototypes. */
void aspath_init ();
struct aspath *aspath_parse ();
struct aspath *aspath_dup (struct aspath *);
struct aspath *aspath_aggregate (struct aspath *, struct aspath *);
struct aspath *aspath_prepend (struct aspath *, struct aspath *);
struct aspath *aspath_add_seq (struct aspath *, as_t);
struct aspath *aspath_add_confed_seq (struct aspath *, as_t);
int aspath_cmp_left (struct aspath *, struct aspath *);
int aspath_cmp_left_confed (struct aspath *, struct aspath *);
struct aspath *aspath_delete_confed_seq (struct aspath *);
struct aspath *aspath_empty ();
struct aspath *aspath_str2aspath (char *);
void aspath_free (struct aspath *);
struct aspath *aspath_intern (struct aspath *);
void aspath_unintern (struct aspath *);
const char *aspath_print (struct aspath *);
void aspath_print_vty (struct vty *, struct aspath *);
void aspath_print_all_vty (struct vty *);
unsigned int aspath_key_make (struct aspath *);
int aspath_loop_check (struct aspath *, as_t);
int aspath_firstas_check (struct aspath *, as_t);
unsigned long aspath_count ();

#endif /* _ZEBRA_BGP_ASPATH_H */
