1 /* AS path related definitions.
2 Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
4 This file is part of GNU Zebra.
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
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.
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
21 #ifndef _QUAGGA_BGP_ASPATH_H
22 #define _QUAGGA_BGP_ASPATH_H
24 /* AS path segment type. */
27 #define AS_CONFED_SEQUENCE 3
28 #define AS_CONFED_SET 4
30 /* Private AS range defined in RFC2270. */
31 #define BGP_PRIVATE_AS_MIN 64512U
32 #define BGP_PRIVATE_AS_MAX 65535U
34 /* Private 4 byte AS range defined in RFC6996. */
35 #define BGP_PRIVATE_AS4_MIN 4200000000U
36 #define BGP_PRIVATE_AS4_MAX 4294967294U
38 /* we leave BGP_AS_MAX as the 16bit AS MAX number. */
39 #define BGP_AS_MAX 65535U
40 #define BGP_AS4_MAX 4294967295U
41 /* Transition 16Bit AS as defined by IANA */
42 #define BGP_AS_TRANS 23456U
44 #define BGP_AS_IS_PRIVATE(ASN) \
45 (((ASN) >= BGP_PRIVATE_AS_MIN && (ASN) <= BGP_PRIVATE_AS_MAX) || \
46 ((ASN) >= BGP_PRIVATE_AS4_MIN && (ASN) <= BGP_PRIVATE_AS4_MAX))
48 /* AS_PATH segment data in abstracted form, no limit is placed on length */
51 struct assegment *next;
57 /* AS path may be include some AsSegments. */
60 /* Reference count to this aspath. */
64 struct assegment *segments;
66 /* String expression of AS path. This string is used by vty output
67 and AS path regular expression match. */
69 unsigned short str_len;
72 #define ASPATH_STR_DEFAULT_LEN 32
75 extern void aspath_init (void);
76 extern void aspath_finish (void);
77 extern struct aspath *aspath_parse (struct stream *, size_t, int);
78 extern struct aspath *aspath_dup (struct aspath *);
79 extern struct aspath *aspath_aggregate (struct aspath *, struct aspath *);
80 extern struct aspath *aspath_aggregate_mpath (struct aspath *, struct aspath *);
81 extern struct aspath *aspath_prepend (struct aspath *, struct aspath *);
82 extern struct aspath *aspath_filter_exclude (struct aspath *, struct aspath *);
83 extern struct aspath *aspath_add_seq_n (struct aspath *, as_t, unsigned);
84 extern struct aspath *aspath_add_seq (struct aspath *, as_t);
85 extern struct aspath *aspath_add_confed_seq (struct aspath *, as_t);
86 extern int aspath_cmp (const void *, const void *);
87 extern int aspath_cmp_left (const struct aspath *, const struct aspath *);
88 extern int aspath_cmp_left_confed (const struct aspath *, const struct aspath *);
89 extern struct aspath *aspath_delete_confed_seq (struct aspath *);
90 extern struct aspath *aspath_empty (void);
91 extern struct aspath *aspath_empty_get (void);
92 extern struct aspath *aspath_str2aspath (const char *);
93 extern void aspath_free (struct aspath *);
94 extern struct aspath *aspath_intern (struct aspath *);
95 extern void aspath_unintern (struct aspath **);
96 extern const char *aspath_print (struct aspath *);
97 extern void aspath_print_vty (struct vty *, const char *, struct aspath *, const char *);
98 extern void aspath_print_all_vty (struct vty *);
99 extern unsigned int aspath_key_make (void *);
100 extern int aspath_loop_check (struct aspath *, as_t);
101 extern int aspath_private_as_check (struct aspath *);
102 extern int aspath_firstas_check (struct aspath *, as_t);
103 extern int aspath_confed_check (struct aspath *);
104 extern int aspath_left_confed_check (struct aspath *);
105 extern unsigned long aspath_count (void);
106 extern unsigned int aspath_count_hops (const struct aspath *);
107 extern unsigned int aspath_count_confeds (struct aspath *);
108 extern unsigned int aspath_size (struct aspath *);
109 extern as_t aspath_highest (struct aspath *);
110 extern as_t aspath_leftmost (struct aspath *);
111 extern size_t aspath_put (struct stream *, struct aspath *, int);
113 extern struct aspath *aspath_reconcile_as4 (struct aspath *, struct aspath *);
114 extern unsigned int aspath_has_as4 (struct aspath *);
116 /* For SNMP BGP4PATHATTRASPATHSEGMENT, might be useful for debug */
117 extern u_char *aspath_snmp_pathseg (struct aspath *, size_t *);
119 #endif /* _QUAGGA_BGP_ASPATH_H */