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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 along
17 * with this program; see the file COPYING; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef _QUAGGA_BGP_ASPATH_H
22 #define _QUAGGA_BGP_ASPATH_H
23
24 #include "lib/json.h"
25
26 /* AS path segment type. */
27 #define AS_SET 1
28 #define AS_SEQUENCE 2
29 #define AS_CONFED_SEQUENCE 3
30 #define AS_CONFED_SET 4
31
32 /* Private AS range defined in RFC2270. */
33 #define BGP_PRIVATE_AS_MIN 64512U
34 #define BGP_PRIVATE_AS_MAX 65535U
35
36 /* Private 4 byte AS range defined in RFC6996. */
37 #define BGP_PRIVATE_AS4_MIN 4200000000U
38 #define BGP_PRIVATE_AS4_MAX 4294967294U
39
40 /* we leave BGP_AS_MAX as the 16bit AS MAX number. */
41 #define BGP_AS_MAX 65535U
42 #define BGP_AS4_MAX 4294967295U
43 /* Transition 16Bit AS as defined by IANA */
44 #define BGP_AS_TRANS 23456U
45
46 #define BGP_AS_IS_PRIVATE(ASN) \
47 (((ASN) >= BGP_PRIVATE_AS_MIN && (ASN) <= BGP_PRIVATE_AS_MAX) \
48 || ((ASN) >= BGP_PRIVATE_AS4_MIN && (ASN) <= BGP_PRIVATE_AS4_MAX))
49
50 /* AS_PATH segment data in abstracted form, no limit is placed on length */
51 struct assegment {
52 struct assegment *next;
53 as_t *as;
54 u_short length;
55 u_char type;
56 };
57
58 /* AS path may be include some AsSegments. */
59 struct aspath {
60 /* Reference count to this aspath. */
61 unsigned long refcnt;
62
63 /* segment data */
64 struct assegment *segments;
65
66 /* AS path as a json object */
67 json_object *json;
68
69 /* String expression of AS path. This string is used by vty output
70 and AS path regular expression match. */
71 char *str;
72 unsigned short str_len;
73 };
74
75 #define ASPATH_STR_DEFAULT_LEN 32
76
77 /* Prototypes. */
78 extern void aspath_init(void);
79 extern void aspath_finish(void);
80 extern struct aspath *aspath_parse(struct stream *, size_t, int);
81 extern struct aspath *aspath_dup(struct aspath *);
82 extern struct aspath *aspath_aggregate(struct aspath *, struct aspath *);
83 extern struct aspath *aspath_prepend(struct aspath *, struct aspath *);
84 extern struct aspath *aspath_filter_exclude(struct aspath *, struct aspath *);
85 extern struct aspath *aspath_add_seq_n(struct aspath *, as_t, unsigned);
86 extern struct aspath *aspath_add_seq(struct aspath *, as_t);
87 extern struct aspath *aspath_add_confed_seq(struct aspath *, as_t);
88 extern int aspath_cmp(const void *, const void *);
89 extern int aspath_cmp_left(const struct aspath *, const struct aspath *);
90 extern int aspath_cmp_left_confed(const struct aspath *, const struct aspath *);
91 extern struct aspath *aspath_delete_confed_seq(struct aspath *);
92 extern struct aspath *aspath_empty(void);
93 extern struct aspath *aspath_empty_get(void);
94 extern struct aspath *aspath_str2aspath(const char *);
95 extern void aspath_free(struct aspath *);
96 extern struct aspath *aspath_intern(struct aspath *);
97 extern void aspath_unintern(struct aspath **);
98 extern const char *aspath_print(struct aspath *);
99 extern void aspath_print_vty(struct vty *, const char *, struct aspath *,
100 const char *);
101 extern void aspath_print_all_vty(struct vty *);
102 extern unsigned int aspath_key_make(void *);
103 extern unsigned int aspath_get_first_as(struct aspath *);
104 extern unsigned int aspath_get_last_as(struct aspath *);
105 extern int aspath_loop_check(struct aspath *, as_t);
106 extern int aspath_private_as_check(struct aspath *);
107 extern int aspath_single_asn_check(struct aspath *, as_t asn);
108 extern struct aspath *aspath_replace_specific_asn(struct aspath *aspath,
109 as_t target_asn,
110 as_t our_asn);
111 extern struct aspath *aspath_replace_private_asns(struct aspath *aspath,
112 as_t asn);
113 extern struct aspath *aspath_remove_private_asns(struct aspath *aspath);
114 extern int aspath_firstas_check(struct aspath *, as_t);
115 extern int aspath_confed_check(struct aspath *);
116 extern int aspath_left_confed_check(struct aspath *);
117 extern unsigned long aspath_count(void);
118 extern unsigned int aspath_count_hops(const struct aspath *);
119 extern unsigned int aspath_count_confeds(struct aspath *);
120 extern unsigned int aspath_size(struct aspath *);
121 extern as_t aspath_highest(struct aspath *);
122 extern as_t aspath_leftmost(struct aspath *);
123 extern size_t aspath_put(struct stream *, struct aspath *, int);
124
125 extern struct aspath *aspath_reconcile_as4(struct aspath *, struct aspath *);
126 extern unsigned int aspath_has_as4(struct aspath *);
127
128 /* For SNMP BGP4PATHATTRASPATHSEGMENT, might be useful for debug */
129 extern u_char *aspath_snmp_pathseg(struct aspath *, size_t *);
130
131 #endif /* _QUAGGA_BGP_ASPATH_H */