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quagga 1.0.20160315

    1: /* AS path related definitions.
    2:    Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
    3: 
    4: This file is part of GNU Zebra.
    5: 
    6: GNU Zebra is free software; you can redistribute it and/or modify it
    7: under the terms of the GNU General Public License as published by the
    8: Free Software Foundation; either version 2, or (at your option) any
    9: later version.
   10: 
   11: GNU Zebra is distributed in the hope that it will be useful, but
   12: WITHOUT ANY WARRANTY; without even the implied warranty of
   13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   14: General Public License for more details.
   15: 
   16: You should have received a copy of the GNU General Public License
   17: along with GNU Zebra; see the file COPYING.  If not, write to the Free
   18: Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
   19: 02111-1307, USA.  */
   20: 
   21: #ifndef _QUAGGA_BGP_ASPATH_H
   22: #define _QUAGGA_BGP_ASPATH_H
   23: 
   24: /* AS path segment type.  */
   25: #define AS_SET                       1
   26: #define AS_SEQUENCE                  2
   27: #define AS_CONFED_SEQUENCE           3
   28: #define AS_CONFED_SET                4
   29: 
   30: /* Private AS range defined in RFC2270.  */
   31: #define BGP_PRIVATE_AS_MIN       64512U
   32: #define BGP_PRIVATE_AS_MAX       65535U
   33: 
   34: /* we leave BGP_AS_MAX as the 16bit AS MAX number.  */
   35: #define BGP_AS_MAX		     65535U
   36: #define BGP_AS4_MAX		4294967295U
   37: /* Transition 16Bit AS as defined by IANA */
   38: #define BGP_AS_TRANS		 23456U
   39: 
   40: /* AS_PATH segment data in abstracted form, no limit is placed on length */
   41: struct assegment
   42: {
   43:   struct assegment *next;
   44:   as_t *as;
   45:   u_short length;
   46:   u_char type;
   47: };
   48: 
   49: /* AS path may be include some AsSegments.  */
   50: struct aspath 
   51: {
   52:   /* Reference count to this aspath.  */
   53:   unsigned long refcnt;
   54: 
   55:   /* segment data */
   56:   struct assegment *segments;
   57:   
   58:   /* String expression of AS path.  This string is used by vty output
   59:      and AS path regular expression match.  */
   60:   char *str;
   61:   unsigned short str_len;
   62: };
   63: 
   64: #define ASPATH_STR_DEFAULT_LEN 32
   65: 
   66: /* Prototypes. */
   67: extern void aspath_init (void);
   68: extern void aspath_finish (void);
   69: extern struct aspath *aspath_parse (struct stream *, size_t, int);
   70: extern struct aspath *aspath_dup (struct aspath *);
   71: extern struct aspath *aspath_aggregate (struct aspath *, struct aspath *);
   72: extern struct aspath *aspath_prepend (struct aspath *, struct aspath *);
   73: extern struct aspath *aspath_filter_exclude (struct aspath *, struct aspath *);
   74: extern struct aspath *aspath_add_seq_n (struct aspath *, as_t, unsigned);
   75: extern struct aspath *aspath_add_seq (struct aspath *, as_t);
   76: extern struct aspath *aspath_add_confed_seq (struct aspath *, as_t);
   77: extern int aspath_cmp (const void *, const void *);
   78: extern int aspath_cmp_left (const struct aspath *, const struct aspath *);
   79: extern int aspath_cmp_left_confed (const struct aspath *, const struct aspath *);
   80: extern struct aspath *aspath_delete_confed_seq (struct aspath *);
   81: extern struct aspath *aspath_empty (void);
   82: extern struct aspath *aspath_empty_get (void);
   83: extern struct aspath *aspath_str2aspath (const char *);
   84: extern void aspath_free (struct aspath *);
   85: extern struct aspath *aspath_intern (struct aspath *);
   86: extern void aspath_unintern (struct aspath **);
   87: extern const char *aspath_print (struct aspath *);
   88: extern void aspath_print_vty (struct vty *, const char *, struct aspath *, const char *);
   89: extern void aspath_print_all_vty (struct vty *);
   90: extern unsigned int aspath_key_make (void *);
   91: extern int aspath_loop_check (struct aspath *, as_t);
   92: extern int aspath_private_as_check (struct aspath *);
   93: extern int aspath_firstas_check (struct aspath *, as_t);
   94: extern int aspath_confed_check (struct aspath *);
   95: extern int aspath_left_confed_check (struct aspath *);
   96: extern unsigned long aspath_count (void);
   97: extern unsigned int aspath_count_hops (struct aspath *);
   98: extern unsigned int aspath_count_confeds (struct aspath *);
   99: extern unsigned int aspath_size (struct aspath *);
  100: extern as_t aspath_highest (struct aspath *);
  101: extern as_t aspath_leftmost (struct aspath *);
  102: extern size_t aspath_put (struct stream *, struct aspath *, int);
  103: 
  104: extern struct aspath *aspath_reconcile_as4 (struct aspath *, struct aspath *);
  105: extern unsigned int aspath_has_as4 (struct aspath *);
  106: 
  107: /* For SNMP BGP4PATHATTRASPATHSEGMENT, might be useful for debug */
  108: extern u_char *aspath_snmp_pathseg (struct aspath *, size_t *);
  109: 
  110: #endif /* _QUAGGA_BGP_ASPATH_H */