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c8a6b9a3d1
Old AS path maching supposes thath AS number appears only once in AS path, but that is not true. It also contains some bugs related to AS path sets. New code does not use any assumptions about semantic structure of AS path. It is asymptotically slower than the old code, but on real paths it is not significant. It also allows '?' for matching one arbitrary AS number.
58 lines
1.6 KiB
C
58 lines
1.6 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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/* 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 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, unsigned int size);
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int as_path_getlen(struct adata *path);
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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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int as_path_is_member(struct adata *path, u32 as);
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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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struct f_path_mask {
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struct f_path_mask *next;
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int kind;
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u32 val;
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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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void int_set_format(struct adata *set, int way, byte *buf, unsigned int size);
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struct adata *int_set_add(struct linpool *pool, struct adata *list, u32 val);
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int int_set_contains(struct adata *list, u32 val);
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struct adata *int_set_del(struct linpool *pool, struct adata *list, u32 val);
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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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#endif
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