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 #include "bgpd/bgp_route.h" 26 27 /* AS path segment type. */ 28 #define AS_SET 1 29 #define AS_SEQUENCE 2 30 #define AS_CONFED_SEQUENCE 3 31 #define AS_CONFED_SET 4 32 33 /* Private AS range defined in RFC2270. */ 34 #define BGP_PRIVATE_AS_MIN 64512U 35 #define BGP_PRIVATE_AS_MAX 65535U 36 37 /* Private 4 byte AS range defined in RFC6996. */ 38 #define BGP_PRIVATE_AS4_MIN 4200000000U 39 #define BGP_PRIVATE_AS4_MAX 4294967294U 40 41 /* we leave BGP_AS_MAX as the 16bit AS MAX number. */ 42 #define BGP_AS_ZERO 0 43 #define BGP_AS_MAX 65535U 44 #define BGP_AS4_MAX 4294967295U 45 /* Transition 16Bit AS as defined by IANA */ 46 #define BGP_AS_TRANS 23456U 47 48 #define BGP_AS_IS_PRIVATE(ASN) \ 49 (((ASN) >= BGP_PRIVATE_AS_MIN && (ASN) <= BGP_PRIVATE_AS_MAX) \ 50 || ((ASN) >= BGP_PRIVATE_AS4_MIN && (ASN) <= BGP_PRIVATE_AS4_MAX)) 51 52 /* AS_PATH segment data in abstracted form, no limit is placed on length */ 53 struct assegment { 54 struct assegment *next; 55 as_t *as; 56 unsigned short length; 57 uint8_t type; 58 }; 59 60 /* AS path may be include some AsSegments. */ 61 struct aspath { 62 /* Reference count to this aspath. */ 63 unsigned long refcnt; 64 65 /* segment data */ 66 struct assegment *segments; 67 68 /* AS path as a json object */ 69 json_object *json; 70 71 /* String expression of AS path. This string is used by vty output 72 and AS path regular expression match. */ 73 char *str; 74 unsigned short str_len; 75 }; 76 77 #define ASPATH_STR_DEFAULT_LEN 32 78 79 /* Prototypes. */ 80 extern void aspath_init(void); 81 extern void aspath_finish(void); 82 extern struct aspath *aspath_parse(struct stream *, size_t, int); 83 extern struct aspath *aspath_dup(struct aspath *); 84 extern struct aspath *aspath_aggregate(struct aspath *, struct aspath *); 85 extern struct aspath *aspath_prepend(struct aspath *, struct aspath *); 86 extern struct aspath *aspath_filter_exclude(struct aspath *, struct aspath *); 87 extern struct aspath *aspath_add_seq_n(struct aspath *, as_t, unsigned); 88 extern struct aspath *aspath_add_seq(struct aspath *, as_t); 89 extern struct aspath *aspath_add_confed_seq(struct aspath *, as_t); 90 extern bool aspath_cmp(const void *as1, const void *as2); 91 extern bool aspath_cmp_left(const struct aspath *, const struct aspath *); 92 extern bool aspath_cmp_left_confed(const struct aspath *as1, 93 const struct aspath *as2xs); 94 extern struct aspath *aspath_delete_confed_seq(struct aspath *); 95 extern struct aspath *aspath_empty(void); 96 extern struct aspath *aspath_empty_get(void); 97 extern struct aspath *aspath_str2aspath(const char *); 98 extern void aspath_str_update(struct aspath *as, bool make_json); 99 extern void aspath_free(struct aspath *); 100 extern struct aspath *aspath_intern(struct aspath *); 101 extern void aspath_unintern(struct aspath **); 102 extern const char *aspath_print(struct aspath *); 103 extern void aspath_print_vty(struct vty *, const char *, struct aspath *, 104 const char *); 105 extern void aspath_print_all_vty(struct vty *); 106 extern unsigned int aspath_key_make(const void *); 107 extern unsigned int aspath_get_first_as(struct aspath *); 108 extern unsigned int aspath_get_last_as(struct aspath *); 109 extern int aspath_loop_check(struct aspath *, as_t); 110 extern bool aspath_private_as_check(struct aspath *); 111 extern bool aspath_single_asn_check(struct aspath *, as_t asn); 112 extern struct aspath *aspath_replace_specific_asn(struct aspath *aspath, 113 as_t target_asn, 114 as_t our_asn); 115 extern struct aspath *aspath_replace_private_asns(struct aspath *aspath, 116 as_t asn, as_t peer_asn); 117 extern struct aspath *aspath_remove_private_asns(struct aspath *aspath, 118 as_t peer_asn); 119 extern bool aspath_firstas_check(struct aspath *, as_t); 120 extern bool aspath_confed_check(struct aspath *); 121 extern bool aspath_left_confed_check(struct aspath *); 122 extern unsigned long aspath_count(void); 123 extern unsigned int aspath_count_hops(const struct aspath *); 124 extern bool aspath_check_as_sets(struct aspath *aspath); 125 extern bool aspath_check_as_zero(struct aspath *aspath); 126 extern unsigned int aspath_count_confeds(struct aspath *); 127 extern unsigned int aspath_size(struct aspath *); 128 extern as_t aspath_highest(struct aspath *); 129 extern as_t aspath_leftmost(struct aspath *); 130 extern size_t aspath_put(struct stream *, struct aspath *, int); 131 132 extern struct aspath *aspath_reconcile_as4(struct aspath *, struct aspath *); 133 extern bool aspath_has_as4(struct aspath *); 134 135 /* For SNMP BGP4PATHATTRASPATHSEGMENT, might be useful for debug */ 136 extern uint8_t *aspath_snmp_pathseg(struct aspath *, size_t *); 137 138 extern void bgp_compute_aggregate_aspath(struct bgp_aggregate *aggregate, 139 struct aspath *aspath); 140 141 extern void bgp_compute_aggregate_aspath_hash(struct bgp_aggregate *aggregate, 142 struct aspath *aspath); 143 extern void bgp_compute_aggregate_aspath_val(struct bgp_aggregate *aggregate); 144 extern void bgp_remove_aspath_from_aggregate(struct bgp_aggregate *aggregate, 145 struct aspath *aspath); 146 extern void bgp_remove_aspath_from_aggregate_hash( 147 struct bgp_aggregate *aggregate, 148 struct aspath *aspath); 149 150 extern void bgp_aggr_aspath_remove(void *arg); 151 152 #endif /* _QUAGGA_BGP_ASPATH_H */ 153