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/*
* BIRD Internet Routing Daemon -- Filters
*
* (c) 1999 Pavel Machek <pavel@ucw.cz>
* (c) 2018--2019 Maria Matejka <mq@jmq.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_FILT_H_
#define _BIRD_FILT_H_
#include "lib/resource.h"
#include "lib/ip.h"
#include "lib/macro.h"
#include "nest/rt.h"
#include "lib/attrs.h"
/* Possible return values of filter execution */
enum filter_return {
F_NOP = 0,
F_NONL,
F_RETURN,
F_ACCEPT, /* Need to preserve ordering: accepts < rejects! */
F_REJECT,
F_ERROR,
};
static inline const char *filter_return_str(const enum filter_return fret) {
switch (fret) {
#define FRS(x) case x: return #x
FRS(F_NOP);
FRS(F_NONL);
FRS(F_RETURN);
FRS(F_ACCEPT);
FRS(F_REJECT);
FRS(F_ERROR);
#undef FRS
default: bug("This shall not happen");
}
}
struct f_val;
/* The filter encapsulating structure to be pointed-to from outside */
struct f_line;
struct filter {
struct symbol *sym;
const struct f_line *root;
};
struct rte;
enum filter_return f_run(const struct filter *filter, struct rte *rte, int flags);
enum filter_return f_eval_rte(const struct f_line *expr, struct rte *rte);
uint f_eval_int(const struct f_line *expr);
enum filter_return f_eval_buf(const struct f_line *expr, buffer *buf);
const char *filter_name(const struct filter *filter);
int filter_same(const struct filter *new, const struct filter *old);
int f_same(const struct f_line *f1, const struct f_line *f2);
void filter_commit(struct config *new, struct config *old);
void filters_dump_all(void);
#define FILTER_ACCEPT NULL
#define FILTER_REJECT ((struct filter *) 1)
#define FILTER_UNDEF ((struct filter *) 2) /* Used in BGP */
#define FF_SILENT 2 /* Silent filter execution */
#endif
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