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 /* 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 };
  62
  63 #define ASPATH_STR_DEFAULT_LEN 32
  64
  65 /* Prototypes. */
  66 extern void aspath_init (void);
  67 extern void aspath_finish (void);
  68 extern struct aspath *aspath_parse (struct stream *, size_t, int);
  69 extern struct aspath *aspath_dup (struct aspath *);
  70 extern struct aspath *aspath_aggregate (struct aspath *, struct aspath *);
  71 extern struct aspath *aspath_prepend (struct aspath *, struct aspath *);
  72 extern struct aspath *aspath_filter_exclude (struct aspath *, struct aspath *);
  73 extern struct aspath *aspath_add_seq (struct aspath *, as_t);
  74 extern struct aspath *aspath_add_confed_seq (struct aspath *, as_t);
  75 extern int aspath_cmp_left (const struct aspath *, const struct aspath *);
  76 extern int aspath_cmp_left_confed (const struct aspath *, const struct aspath *);
  77 extern struct aspath *aspath_delete_confed_seq (struct aspath *);
  78 extern struct aspath *aspath_empty (void);
  79 extern struct aspath *aspath_empty_get (void);
  80 extern struct aspath *aspath_str2aspath (const char *);
  81 extern void aspath_free (struct aspath *);
  82 extern struct aspath *aspath_intern (struct aspath *);
  83 extern void aspath_unintern (struct aspath *);
  84 extern const char *aspath_print (struct aspath *);
  85 extern void aspath_print_vty (struct vty *, const char *, struct aspath *, const char *);
  86 extern void aspath_print_all_vty (struct vty *);
  87 extern unsigned int aspath_key_make (void *);
  88 extern int aspath_loop_check (struct aspath *, as_t);
  89 extern int aspath_private_as_check (struct aspath *);
  90 extern int aspath_firstas_check (struct aspath *, as_t);
  91 extern int aspath_confed_check (struct aspath *);
  92 extern int aspath_left_confed_check (struct aspath *);
  93 extern unsigned long aspath_count (void);
  94 extern unsigned int aspath_count_hops (struct aspath *);
  95 extern unsigned int aspath_count_confeds (struct aspath *);
  96 extern unsigned int aspath_size (struct aspath *);
  97 extern as_t aspath_highest (struct aspath *);
  98 extern size_t aspath_put (struct stream *, struct aspath *, int);
  99
 100 extern struct aspath *aspath_reconcile_as4 (struct aspath *, struct aspath *);
 101 extern unsigned int aspath_has_as4 (struct aspath *);
 102
 103 /* For SNMP BGP4PATHATTRASPATHSEGMENT, might be useful for debug */
 104 extern u_char *aspath_snmp_pathseg (struct aspath *, size_t *);
 105
 106 #endif /* _QUAGGA_BGP_ASPATH_H */