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User can specify list of route attributes in the configuration file and run route aggregation on the export side of the pipe protocol. Routes are sorted and for every group of equivalent routes new route is created and exported to the routing table. It is also possible to specify filter which will run for every route before aggregation. Furthermore, it will be possible to set attributes of new routes according to attributes of the aggregated routes. This is a work in progress.
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/*
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* BIRD Internet Routing Daemon -- Filters
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*
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* (c) 1999 Pavel Machek <pavel@ucw.cz>
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* (c) 2018--2019 Maria Matejka <mq@jmq.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_FILT_H_
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#define _BIRD_FILT_H_
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#include "lib/resource.h"
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#include "lib/ip.h"
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#include "lib/macro.h"
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#include "nest/route.h"
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#include "nest/attrs.h"
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/* Possible return values of filter execution */
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enum filter_return {
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F_NOP = 0,
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F_NONL,
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F_RETURN,
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F_ACCEPT, /* Need to preserve ordering: accepts < rejects! */
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F_REJECT,
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F_ERROR,
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};
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static inline const char *filter_return_str(const enum filter_return fret) {
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switch (fret) {
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#define FRS(x) case x: return #x
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FRS(F_NOP);
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FRS(F_NONL);
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FRS(F_RETURN);
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FRS(F_ACCEPT);
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FRS(F_REJECT);
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FRS(F_ERROR);
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#undef FRS
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default: bug("This shall not happen");
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}
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}
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struct f_val;
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/* The filter encapsulating structure to be pointed-to from outside */
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struct f_line;
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struct filter {
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struct symbol *sym;
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const struct f_line *root;
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};
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struct rte;
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enum filter_return f_aggr_eval_line(const struct f_line *line, struct rte **rte, struct linpool *pool, struct f_val *pres);
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enum filter_return f_run(const struct filter *filter, struct rte **rte, struct linpool *tmp_pool, int flags);
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enum filter_return f_run_val(const struct filter *filter, struct rte **rte, struct linpool *tmp_pool, const struct f_val *val, int flags);
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enum filter_return f_eval_rte(const struct f_line *expr, struct rte **rte, struct linpool *tmp_pool);
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uint f_eval_int(const struct f_line *expr);
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enum filter_return f_eval_buf(const struct f_line *expr, struct linpool *tmp_pool, buffer *buf);
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const char *filter_name(const struct filter *filter);
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int filter_same(const struct filter *new, const struct filter *old);
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int f_same(const struct f_line *f1, const struct f_line *f2);
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void filter_commit(struct config *new, struct config *old);
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void filters_dump_all(void);
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#define FILTER_ACCEPT NULL
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#define FILTER_REJECT ((struct filter *) 1)
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#define FILTER_UNDEF ((struct filter *) 2) /* Used in BGP */
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#define FF_SILENT 2 /* Silent filter execution */
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/* Custom route attributes */
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struct custom_attribute {
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resource r;
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struct f_dynamic_attr *fda;
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const char *name;
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};
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struct custom_attribute *ca_lookup(pool *p, const char *name, int ea_type);
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#endif
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