mirror of https://github.com/FRRouting/frr.git
130 lines
5.1 KiB
C
130 lines
5.1 KiB
C
/* AS path related definitions.
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* Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* GNU Zebra is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _QUAGGA_BGP_ASPATH_H
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#define _QUAGGA_BGP_ASPATH_H
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#include "lib/json.h"
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/* AS path segment type. */
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#define AS_SET 1
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#define AS_SEQUENCE 2
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#define AS_CONFED_SEQUENCE 3
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#define AS_CONFED_SET 4
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/* Private AS range defined in RFC2270. */
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#define BGP_PRIVATE_AS_MIN 64512U
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#define BGP_PRIVATE_AS_MAX 65535U
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/* Private 4 byte AS range defined in RFC6996. */
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#define BGP_PRIVATE_AS4_MIN 4200000000U
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#define BGP_PRIVATE_AS4_MAX 4294967294U
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/* we leave BGP_AS_MAX as the 16bit AS MAX number. */
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#define BGP_AS_MAX 65535U
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#define BGP_AS4_MAX 4294967295U
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/* Transition 16Bit AS as defined by IANA */
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#define BGP_AS_TRANS 23456U
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#define BGP_AS_IS_PRIVATE(ASN) \
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(((ASN) >= BGP_PRIVATE_AS_MIN && (ASN) <= BGP_PRIVATE_AS_MAX) || \
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((ASN) >= BGP_PRIVATE_AS4_MIN && (ASN) <= BGP_PRIVATE_AS4_MAX))
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/* AS_PATH segment data in abstracted form, no limit is placed on length */
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struct assegment
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{
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struct assegment *next;
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as_t *as;
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u_short length;
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u_char type;
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};
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/* AS path may be include some AsSegments. */
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struct aspath
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{
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/* Reference count to this aspath. */
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unsigned long refcnt;
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/* segment data */
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struct assegment *segments;
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/* AS path as a json object */
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json_object *json;
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/* String expression of AS path. This string is used by vty output
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and AS path regular expression match. */
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char *str;
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unsigned short str_len;
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};
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#define ASPATH_STR_DEFAULT_LEN 32
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/* Prototypes. */
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extern void aspath_init (void);
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extern void aspath_finish (void);
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extern struct aspath *aspath_parse (struct stream *, size_t, int);
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extern struct aspath *aspath_dup (struct aspath *);
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extern struct aspath *aspath_aggregate (struct aspath *, struct aspath *);
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extern struct aspath *aspath_prepend (struct aspath *, struct aspath *);
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extern struct aspath *aspath_filter_exclude (struct aspath *, struct aspath *);
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extern struct aspath *aspath_add_seq_n (struct aspath *, as_t, unsigned);
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extern struct aspath *aspath_add_seq (struct aspath *, as_t);
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extern struct aspath *aspath_add_confed_seq (struct aspath *, as_t);
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extern int aspath_cmp (const void *, const void *);
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extern int aspath_cmp_left (const struct aspath *, const struct aspath *);
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extern int aspath_cmp_left_confed (const struct aspath *, const struct aspath *);
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extern struct aspath *aspath_delete_confed_seq (struct aspath *);
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extern struct aspath *aspath_empty (void);
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extern struct aspath *aspath_empty_get (void);
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extern struct aspath *aspath_str2aspath (const char *);
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extern void aspath_free (struct aspath *);
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extern struct aspath *aspath_intern (struct aspath *);
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extern void aspath_unintern (struct aspath **);
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extern const char *aspath_print (struct aspath *);
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extern void aspath_print_vty (struct vty *, const char *, struct aspath *, const char *);
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extern void aspath_print_all_vty (struct vty *);
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extern unsigned int aspath_key_make (void *);
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extern unsigned int aspath_get_first_as (struct aspath *);
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extern unsigned int aspath_get_last_as (struct aspath *);
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extern int aspath_loop_check (struct aspath *, as_t);
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extern int aspath_private_as_check (struct aspath *);
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extern int aspath_single_asn_check (struct aspath *, as_t asn);
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extern struct aspath *aspath_replace_specific_asn (struct aspath *aspath, as_t target_asn, as_t our_asn);
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extern struct aspath *aspath_replace_private_asns(struct aspath *aspath, as_t asn);
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extern struct aspath *aspath_remove_private_asns (struct aspath *aspath);
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extern int aspath_firstas_check (struct aspath *, as_t);
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extern int aspath_confed_check (struct aspath *);
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extern int aspath_left_confed_check (struct aspath *);
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extern unsigned long aspath_count (void);
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extern unsigned int aspath_count_hops (const struct aspath *);
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extern unsigned int aspath_count_confeds (struct aspath *);
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extern unsigned int aspath_size (struct aspath *);
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extern as_t aspath_highest (struct aspath *);
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extern as_t aspath_leftmost (struct aspath *);
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extern size_t aspath_put (struct stream *, struct aspath *, int);
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extern struct aspath *aspath_reconcile_as4 (struct aspath *, struct aspath *);
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extern unsigned int aspath_has_as4 (struct aspath *);
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/* For SNMP BGP4PATHATTRASPATHSEGMENT, might be useful for debug */
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extern u_char *aspath_snmp_pathseg (struct aspath *, size_t *);
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#endif /* _QUAGGA_BGP_ASPATH_H */
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