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Diffstat (limited to 'bgpd/bgp_aspath.h')
| -rw-r--r-- | bgpd/bgp_aspath.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/bgpd/bgp_aspath.h b/bgpd/bgp_aspath.h new file mode 100644 index 0000000..0b58e1a --- /dev/null +++ b/bgpd/bgp_aspath.h @@ -0,0 +1,158 @@ +/* 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 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; +}; + +#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); +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_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(void); +extern struct aspath *aspath_empty_get(void); +extern struct aspath *aspath_str2aspath(const char *str); +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, const char *format, + struct aspath *aspath, const char *suffix); +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 bool aspath_private_as_check(struct aspath *aspath); +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 */ |