bgpd/bgp_aspath.h

   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 #define BGP_AS_MAX               65535U
  35
  36 /* AS_PATH segment data in abstracted form, no limit is placed on length */
  37 struct assegment
  38 {
  39   struct assegment *next;
  40   as_t *as;
  41   u_short length;
  42   u_char type;
  43 };
  44
  45 /* AS path may be include some AsSegments.  */
  46 struct aspath
  47 {
  48   /* Reference count to this aspath.  */
  49   unsigned long refcnt;
  50
  51   /* segment data */
  52   struct assegment *segments;
  53
  54   /* String expression of AS path.  This string is used by vty output
  55      and AS path regular expression match.  */
  56   char *str;
  57 };
  58
  59 #define ASPATH_STR_DEFAULT_LEN 32
  60
  61 /* Prototypes. */
  62 extern void aspath_init (void);
  63 extern void aspath_finish (void);
  64 extern struct aspath *aspath_parse (struct stream *, size_t);
  65 extern struct aspath *aspath_dup (struct aspath *);
  66 extern struct aspath *aspath_aggregate (struct aspath *, struct aspath *);
  67 extern struct aspath *aspath_prepend (struct aspath *, struct aspath *);
  68 extern struct aspath *aspath_add_seq (struct aspath *, as_t);
  69 extern struct aspath *aspath_add_confed_seq (struct aspath *, as_t);
  70 extern int aspath_cmp_left (struct aspath *, struct aspath *);
  71 extern int aspath_cmp_left_confed (struct aspath *, struct aspath *);
  72 extern struct aspath *aspath_delete_confed_seq (struct aspath *);
  73 extern struct aspath *aspath_empty (void);
  74 extern struct aspath *aspath_empty_get (void);
  75 extern struct aspath *aspath_str2aspath (const char *);
  76 extern void aspath_free (struct aspath *);
  77 extern struct aspath *aspath_intern (struct aspath *);
  78 extern void aspath_unintern (struct aspath *);
  79 extern const char *aspath_print (struct aspath *);
  80 extern void aspath_print_vty (struct vty *, const char *, struct aspath *);
  81 extern void aspath_print_all_vty (struct vty *);
  82 extern unsigned int aspath_key_make (void *);
  83 extern int aspath_loop_check (struct aspath *, as_t);
  84 extern int aspath_private_as_check (struct aspath *);
  85 extern int aspath_firstas_check (struct aspath *, as_t);
  86 extern unsigned long aspath_count (void);
  87 extern unsigned int aspath_count_hops (struct aspath *);
  88 extern unsigned int aspath_count_confeds (struct aspath *);
  89 extern unsigned int aspath_size (struct aspath *);
  90 extern as_t aspath_highest (struct aspath *);
  91 extern void aspath_put (struct stream *, struct aspath *);
  92
  93 /* For SNMP BGP4PATHATTRASPATHSEGMENT, might be useful for debug */
  94 extern u_char *aspath_snmp_pathseg (struct aspath *, size_t *);
  95
  96 #endif /* _QUAGGA_BGP_ASPATH_H */