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