1/* AS path related definitions. 2 Copyright (C) 1997, 98, 99 Kunihiro Ishiguro 3 4This file is part of GNU Zebra. 5 6GNU Zebra is free software; you can redistribute it and/or modify it 7under the terms of the GNU General Public License as published by the 8Free Software Foundation; either version 2, or (at your option) any 9later version. 10 11GNU Zebra is distributed in the hope that it will be useful, but 12WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14General Public License for more details. 15 16You should have received a copy of the GNU General Public License 17along with GNU Zebra; see the file COPYING. If not, write to the Free 18Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 1902111-1307, 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 */ 41struct 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. */ 50struct 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. */ 67extern void aspath_init (void); 68extern void aspath_finish (void); 69extern struct aspath *aspath_parse (struct stream *, size_t, int); 70extern struct aspath *aspath_dup (struct aspath *); 71extern struct aspath *aspath_aggregate (struct aspath *, struct aspath *); 72extern struct aspath *aspath_prepend (struct aspath *, struct aspath *); 73extern struct aspath *aspath_filter_exclude (struct aspath *, struct aspath *); 74extern struct aspath *aspath_add_seq_n (struct aspath *, as_t, unsigned); 75extern struct aspath *aspath_add_seq (struct aspath *, as_t); 76extern struct aspath *aspath_add_confed_seq (struct aspath *, as_t); 77extern int aspath_cmp (const void *, const void *); 78extern int aspath_cmp_left (const struct aspath *, const struct aspath *); 79extern int aspath_cmp_left_confed (const struct aspath *, const struct aspath *); 80extern struct aspath *aspath_delete_confed_seq (struct aspath *); 81extern struct aspath *aspath_empty (void); 82extern struct aspath *aspath_empty_get (void); 83extern struct aspath *aspath_str2aspath (const char *); 84extern void aspath_free (struct aspath *); 85extern struct aspath *aspath_intern (struct aspath *); 86extern void aspath_unintern (struct aspath **); 87extern const char *aspath_print (struct aspath *); 88extern void aspath_print_vty (struct vty *, const char *, struct aspath *, const char *); 89extern void aspath_print_all_vty (struct vty *); 90extern unsigned int aspath_key_make (void *); 91extern int aspath_loop_check (struct aspath *, as_t); 92extern int aspath_private_as_check (struct aspath *); 93extern int aspath_firstas_check (struct aspath *, as_t); 94extern int aspath_confed_check (struct aspath *); 95extern int aspath_left_confed_check (struct aspath *); 96extern unsigned long aspath_count (void); 97extern unsigned int aspath_count_hops (struct aspath *); 98extern unsigned int aspath_count_confeds (struct aspath *); 99extern unsigned int aspath_size (struct aspath *); 100extern as_t aspath_highest (struct aspath *); 101extern as_t aspath_leftmost (struct aspath *); 102extern size_t aspath_put (struct stream *, struct aspath *, int); 103 104extern struct aspath *aspath_reconcile_as4 (struct aspath *, struct aspath *); 105extern unsigned int aspath_has_as4 (struct aspath *); 106 107/* For SNMP BGP4PATHATTRASPATHSEGMENT, might be useful for debug */ 108extern u_char *aspath_snmp_pathseg (struct aspath *, size_t *); 109 110#endif /* _QUAGGA_BGP_ASPATH_H */ 111