66dbdbd993
Add support for large communities (draft-ietf-idr-large-community), 96bit alternative to RFC 1997 communities. Thanks to Matt Griswold for the original patch.
146 lines
4.6 KiB
C
146 lines
4.6 KiB
C
/*
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* BIRD Internet Routing Daemon -- Attribute Operations
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*
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* (c) 2000 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_ATTRS_H_
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#define _BIRD_ATTRS_H_
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#include <stdint.h>
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/* a-path.c */
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#define AS_PATH_SET 1 /* Types of path segments */
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#define AS_PATH_SEQUENCE 2
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#define AS_PATH_CONFED_SEQUENCE 3
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#define AS_PATH_CONFED_SET 4
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#define AS_PATH_MAXLEN 10000
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#define AS_TRANS 23456
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/* AS_TRANS is used when we need to store 32bit ASN larger than 0xFFFF
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* to 16bit slot (like in 16bit AS_PATH). See RFC 4893 for details
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*/
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struct f_tree;
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struct adata *as_path_prepend(struct linpool *pool, struct adata *olda, u32 as);
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int as_path_convert_to_old(struct adata *path, byte *dst, int *new_used);
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int as_path_convert_to_new(struct adata *path, byte *dst, int req_as);
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void as_path_format(struct adata *path, byte *buf, uint size);
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int as_path_getlen(struct adata *path);
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int as_path_getlen_int(struct adata *path, int bs);
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int as_path_get_first(struct adata *path, u32 *orig_as);
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int as_path_get_last(struct adata *path, u32 *last_as);
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u32 as_path_get_last_nonaggregated(struct adata *path);
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int as_path_contains(struct adata *path, u32 as, int min);
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int as_path_match_set(struct adata *path, struct f_tree *set);
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struct adata *as_path_filter(struct linpool *pool, struct adata *path, struct f_tree *set, u32 key, int pos);
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#define PM_ASN 0
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#define PM_QUESTION 1
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#define PM_ASTERISK 2
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#define PM_ASN_EXPR 3
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#define PM_ASN_RANGE 4
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struct f_path_mask {
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struct f_path_mask *next;
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int kind;
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uintptr_t val;
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uintptr_t val2;
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};
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int as_path_match(struct adata *path, struct f_path_mask *mask);
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/* a-set.c */
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/* Extended Community subtypes (kinds) */
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#define EC_RT 0x0002
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#define EC_RO 0x0003
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#define EC_GENERIC 0xFFFF
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/* Transitive bit (for first u32 half of EC) */
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#define EC_TBIT 0x40000000
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#define ECOMM_LENGTH 8
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static inline int int_set_get_size(struct adata *list)
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{ return list->length / 4; }
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static inline int ec_set_get_size(struct adata *list)
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{ return list->length / 8; }
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static inline int lc_set_get_size(struct adata *list)
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{ return list->length / 12; }
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static inline u32 *int_set_get_data(struct adata *list)
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{ return (u32 *) list->data; }
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static inline u32 ec_hi(u64 ec) { return ec >> 32; }
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static inline u32 ec_lo(u64 ec) { return ec; }
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static inline u64 ec_get(const u32 *l, int i)
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{ return (((u64) l[i]) << 32) | l[i+1]; }
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/* RFC 4360 3.1. Two-Octet AS Specific Extended Community */
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static inline u64 ec_as2(u64 kind, u64 key, u64 val)
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{ return ((kind | 0x0000) << 48) | (key << 32) | val; }
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/* RFC 5668 4-Octet AS Specific BGP Extended Community */
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static inline u64 ec_as4(u64 kind, u64 key, u64 val)
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{ return ((kind | 0x0200) << 48) | (key << 16) | val; }
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/* RFC 4360 3.2. IPv4 Address Specific Extended Community */
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static inline u64 ec_ip4(u64 kind, u64 key, u64 val)
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{ return ((kind | 0x0100) << 48) | (key << 16) | val; }
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static inline u64 ec_generic(u64 key, u64 val)
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{ return (key << 32) | val; }
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/* Large community value */
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typedef struct lcomm {
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u32 asn;
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u32 ldp1;
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u32 ldp2;
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} lcomm;
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#define LCOMM_LENGTH 12
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static inline lcomm lc_get(const u32 *l, int i)
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{ return (lcomm) { l[i], l[i+1], l[i+2] }; }
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static inline void lc_put(u32 *l, lcomm v)
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{ l[0] = v.asn; l[1] = v.ldp1; l[2] = v.ldp2; }
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static inline int lc_match(const u32 *l, int i, lcomm v)
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{ return (l[i] == v.asn && l[i+1] == v.ldp1 && l[i+2] == v.ldp2); }
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static inline u32 *lc_copy(u32 *dst, const u32 *src)
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{ memcpy(dst, src, LCOMM_LENGTH); return dst + 3; }
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int int_set_format(struct adata *set, int way, int from, byte *buf, uint size);
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int ec_format(byte *buf, u64 ec);
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int ec_set_format(struct adata *set, int from, byte *buf, uint size);
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int lc_format(byte *buf, lcomm lc);
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int lc_set_format(struct adata *set, int from, byte *buf, uint size);
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int int_set_contains(struct adata *list, u32 val);
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int ec_set_contains(struct adata *list, u64 val);
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int lc_set_contains(struct adata *list, lcomm val);
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struct adata *int_set_add(struct linpool *pool, struct adata *list, u32 val);
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struct adata *ec_set_add(struct linpool *pool, struct adata *list, u64 val);
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struct adata *lc_set_add(struct linpool *pool, struct adata *list, lcomm val);
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struct adata *int_set_del(struct linpool *pool, struct adata *list, u32 val);
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struct adata *ec_set_del(struct linpool *pool, struct adata *list, u64 val);
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struct adata *lc_set_del(struct linpool *pool, struct adata *list, lcomm val);
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struct adata *int_set_union(struct linpool *pool, struct adata *l1, struct adata *l2);
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struct adata *ec_set_union(struct linpool *pool, struct adata *l1, struct adata *l2);
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struct adata *lc_set_union(struct linpool *pool, struct adata *l1, struct adata *l2);
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#endif
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