// SPDX-License-Identifier: GPL-2.0-or-later /* AS path related definitions. * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro */ #ifndef _QUAGGA_BGP_ASPATH_H #define _QUAGGA_BGP_ASPATH_H #include "lib/json.h" #include "bgpd/bgp_route.h" #include "bgpd/bgp_filter.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 UINT16_MAX /* 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_ZERO 0 #define BGP_AS_MAX UINT16_MAX #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; /* AS notation used by string expression of AS path */ enum asnotation_mode asnotation; }; #define ASPATH_STR_DEFAULT_LEN 32 /* Prototypes. */ extern void aspath_init(void); extern void aspath_finish(void); extern struct aspath *aspath_parse(struct stream *s, size_t length, int use32bit, enum asnotation_mode asnotation); extern struct aspath *aspath_dup(struct aspath *aspath); extern struct aspath *aspath_aggregate(struct aspath *as1, struct aspath *as2); extern struct aspath *aspath_prepend(struct aspath *as1, struct aspath *as2); extern struct aspath *aspath_filter_exclude(struct aspath *source, struct aspath *exclude_list); extern struct aspath *aspath_filter_exclude_all(struct aspath *source); extern struct aspath *aspath_filter_exclude_acl(struct aspath *source, struct as_list *acl_list); extern struct aspath *aspath_add_seq_n(struct aspath *aspath, as_t asno, unsigned num); extern struct aspath *aspath_add_seq(struct aspath *aspath, as_t asno); extern struct aspath *aspath_add_confed_seq(struct aspath *aspath, as_t asno); extern bool aspath_cmp(const void *as1, const void *as2); extern bool aspath_cmp_left(const struct aspath *aspath1, const struct aspath *aspath2); extern bool aspath_cmp_left_confed(const struct aspath *as1, const struct aspath *as2); extern struct aspath *aspath_delete_confed_seq(struct aspath *aspath); extern struct aspath *aspath_empty(enum asnotation_mode asnotation); extern struct aspath *aspath_empty_get(void); extern struct aspath *aspath_str2aspath(const char *str, enum asnotation_mode asnotation); extern void aspath_str_update(struct aspath *as, bool make_json); extern void aspath_free(struct aspath *aspath); extern struct aspath *aspath_intern(struct aspath *aspath); extern void aspath_unintern(struct aspath **aspath); extern const char *aspath_print(struct aspath *aspath); extern void aspath_print_vty(struct vty *vty, struct aspath *aspath); extern void aspath_print_all_vty(struct vty *vty); extern unsigned int aspath_key_make(const void *p); extern unsigned int aspath_get_first_as(struct aspath *aspath); extern unsigned int aspath_get_last_as(struct aspath *aspath); extern int aspath_loop_check(struct aspath *aspath, as_t asno); extern int aspath_loop_check_confed(struct aspath *aspath, as_t asno); extern bool aspath_private_as_check(struct aspath *aspath); extern struct aspath *aspath_replace_regex_asn(struct aspath *aspath, struct as_list *acl_list, as_t our_asn); extern struct aspath *aspath_replace_specific_asn(struct aspath *aspath, as_t target_asn, as_t our_asn); extern struct aspath *aspath_replace_all_asn(struct aspath *aspath, as_t our_asn); extern struct aspath *aspath_replace_private_asns(struct aspath *aspath, as_t asn, as_t peer_asn); extern struct aspath *aspath_remove_private_asns(struct aspath *aspath, as_t peer_asn); extern bool aspath_firstas_check(struct aspath *aspath, as_t asno); extern bool aspath_confed_check(struct aspath *aspath); extern bool aspath_left_confed_check(struct aspath *aspath); extern unsigned long aspath_count(void); extern unsigned int aspath_count_hops(const struct aspath *aspath); extern bool aspath_check_as_sets(struct aspath *aspath); extern bool aspath_check_as_zero(struct aspath *aspath); extern unsigned int aspath_count_confeds(struct aspath *aspath); extern unsigned int aspath_size(struct aspath *aspath); extern as_t aspath_highest(struct aspath *aspath); extern as_t aspath_leftmost(struct aspath *aspath); extern size_t aspath_put(struct stream *s, struct aspath *aspath, int use32bit); extern struct aspath *aspath_reconcile_as4(struct aspath *aspath, struct aspath *as4path); extern bool aspath_has_as4(struct aspath *aspath); /* For SNMP BGP4PATHATTRASPATHSEGMENT, might be useful for debug */ extern uint8_t *aspath_snmp_pathseg(struct aspath *aspath, size_t *varlen); extern void bgp_compute_aggregate_aspath(struct bgp_aggregate *aggregate, struct aspath *aspath); extern void bgp_compute_aggregate_aspath_hash(struct bgp_aggregate *aggregate, struct aspath *aspath); extern void bgp_compute_aggregate_aspath_val(struct bgp_aggregate *aggregate); extern void bgp_remove_aspath_from_aggregate(struct bgp_aggregate *aggregate, struct aspath *aspath); extern void bgp_remove_aspath_from_aggregate_hash( struct bgp_aggregate *aggregate, struct aspath *aspath); extern void bgp_aggr_aspath_remove(void *arg); #endif /* _QUAGGA_BGP_ASPATH_H */