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/* AS path related definitions.
* Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _QUAGGA_BGP_ASPATH_H
#define _QUAGGA_BGP_ASPATH_H
#include "lib/json.h"
#include "bgpd/bgp_route.h"
/* AS path segment type. */
#define AS_SET 1
#define AS_SEQUENCE 2
#define AS_CONFED_SEQUENCE 3
#define AS_CONFED_SET 4
/* Private AS range defined in RFC2270. */
#define BGP_PRIVATE_AS_MIN 64512U
#define BGP_PRIVATE_AS_MAX 65535U
/* Private 4 byte AS range defined in RFC6996. */
#define BGP_PRIVATE_AS4_MIN 4200000000U
#define BGP_PRIVATE_AS4_MAX 4294967294U
/* we leave BGP_AS_MAX as the 16bit AS MAX number. */
#define BGP_AS_MAX 65535U
#define BGP_AS4_MAX 4294967295U
/* Transition 16Bit AS as defined by IANA */
#define BGP_AS_TRANS 23456U
#define BGP_AS_IS_PRIVATE(ASN) \
(((ASN) >= BGP_PRIVATE_AS_MIN && (ASN) <= BGP_PRIVATE_AS_MAX) \
|| ((ASN) >= BGP_PRIVATE_AS4_MIN && (ASN) <= BGP_PRIVATE_AS4_MAX))
/* AS_PATH segment data in abstracted form, no limit is placed on length */
struct assegment {
struct assegment *next;
as_t *as;
unsigned short length;
uint8_t type;
};
/* AS path may be include some AsSegments. */
struct aspath {
/* Reference count to this aspath. */
unsigned long refcnt;
/* segment data */
struct assegment *segments;
/* AS path as a json object */
json_object *json;
/* String expression of AS path. This string is used by vty output
and AS path regular expression match. */
char *str;
unsigned short str_len;
};
#define ASPATH_STR_DEFAULT_LEN 32
/* Prototypes. */
extern void aspath_init(void);
extern void aspath_finish(void);
extern struct aspath *aspath_parse(struct stream *, size_t, int);
extern struct aspath *aspath_dup(struct aspath *);
extern struct aspath *aspath_aggregate(struct aspath *, struct aspath *);
extern struct aspath *aspath_prepend(struct aspath *, struct aspath *);
extern struct aspath *aspath_filter_exclude(struct aspath *, struct aspath *);
extern struct aspath *aspath_add_seq_n(struct aspath *, as_t, unsigned);
extern struct aspath *aspath_add_seq(struct aspath *, as_t);
extern struct aspath *aspath_add_confed_seq(struct aspath *, as_t);
extern bool aspath_cmp(const void *as1, const void *as2);
extern int aspath_cmp_left(const struct aspath *, const struct aspath *);
extern bool aspath_cmp_left_confed(const struct aspath *as1,
const struct aspath *as2xs);
extern struct aspath *aspath_delete_confed_seq(struct aspath *);
extern struct aspath *aspath_empty(void);
extern struct aspath *aspath_empty_get(void);
extern struct aspath *aspath_str2aspath(const char *);
extern void aspath_str_update(struct aspath *as, bool make_json);
extern void aspath_free(struct aspath *);
extern struct aspath *aspath_intern(struct aspath *);
extern void aspath_unintern(struct aspath **);
extern const char *aspath_print(struct aspath *);
extern void aspath_print_vty(struct vty *, const char *, struct aspath *,
const char *);
extern void aspath_print_all_vty(struct vty *);
extern unsigned int aspath_key_make(void *);
extern unsigned int aspath_get_first_as(struct aspath *);
extern unsigned int aspath_get_last_as(struct aspath *);
extern int aspath_loop_check(struct aspath *, as_t);
extern int aspath_private_as_check(struct aspath *);
extern int aspath_single_asn_check(struct aspath *, as_t asn);
extern struct aspath *aspath_replace_specific_asn(struct aspath *aspath,
as_t target_asn,
as_t our_asn);
extern struct aspath *aspath_replace_private_asns(struct aspath *aspath,
as_t asn);
extern struct aspath *aspath_remove_private_asns(struct aspath *aspath);
extern int aspath_firstas_check(struct aspath *, as_t);
extern int aspath_confed_check(struct aspath *);
extern int aspath_left_confed_check(struct aspath *);
extern unsigned long aspath_count(void);
extern unsigned int aspath_count_hops(const struct aspath *);
extern unsigned int aspath_count_confeds(struct aspath *);
extern unsigned int aspath_size(struct aspath *);
extern as_t aspath_highest(struct aspath *);
extern as_t aspath_leftmost(struct aspath *);
extern size_t aspath_put(struct stream *, struct aspath *, int);
extern struct aspath *aspath_reconcile_as4(struct aspath *, struct aspath *);
extern unsigned int aspath_has_as4(struct aspath *);
/* For SNMP BGP4PATHATTRASPATHSEGMENT, might be useful for debug */
extern uint8_t *aspath_snmp_pathseg(struct aspath *, size_t *);
extern void bgp_compute_aggregate_aspath(struct bgp_aggregate *aggregate,
struct aspath *aspath);
extern void bgp_remove_aspath_from_aggregate(struct bgp_aggregate *aggregate,
struct aspath *aspath);
extern void bgp_aggr_aspath_remove(void *arg);
#endif /* _QUAGGA_BGP_ASPATH_H */
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