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/*
* BIRD Internet Routing Daemon -- Filters
*
* (c) 1999 Pavel Machek <pavel@ucw.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"
struct f_inst { /* Instruction */
struct f_inst *next; /* Structure is 16 bytes, anyway */
u16 code;
u16 aux;
union {
int i;
void *p;
} a1;
union {
int i;
void *p;
} a2;
};
#define arg1 a1.p
#define arg2 a2.p
struct prefix {
ip_addr ip;
int len;
#define LEN_MASK 0xff
#define LEN_PLUS 0x1000000
#define LEN_MINUS 0x2000000
#define LEN_RANGE 0x4000000
/* If range then prefix must be in range (len >> 16 & 0xff, len >> 8 & 0xff) */
};
struct f_val {
int type;
union {
int i;
/* ip_addr ip; Folded into prefix */
struct prefix px;
char *s;
struct f_tree *t;
} val;
};
struct filter {
char *name;
struct f_inst *root;
};
void filters_postconfig(void);
struct f_inst *f_new_inst(void);
struct f_tree *f_new_tree(void);
struct f_tree *build_tree(struct f_tree *);
struct f_tree *find_tree(struct f_tree *t, struct f_val val);
struct ea_list;
struct rte;
int f_run(struct filter *filter, struct rte **rte, struct ea_list **tmp_attrs, struct linpool *tmp_pool);
char *filter_name(struct filter *filter);
int val_compare(struct f_val v1, struct f_val v2);
void val_print(struct f_val v);
#define F_NOP 0
#define F_NONL 1
#define F_ACCEPT 2 /* Need to preserve ordering: accepts < rejects! */
#define F_REJECT 3
#define F_ERROR 4
#define F_QUITBIRD 5
#define FILTER_ACCEPT NULL
#define FILTER_REJECT ((void *) 1)
/* Type numbers must be in 0..0xff range */
#define T_MASK 0xff
/* Internal types */
/* Do not use type of zero, that way we'll see errors easier. */
#define T_VOID 1
#define T_RETURN 2
/* User visible types, which fit in int */
#define T_INT 0x10
#define T_BOOL 0x11
#define T_PAIR 0x12
/* Put enumerational types in 0x30..0x7f range */
#define T_ENUM_LO 0x30
#define T_ENUM_HI 0x7f
#define T_ENUM_RTS 0x30
#define T_ENUM T_ENUM_LO ... T_ENUM_HI
/* Bigger ones */
#define T_IP 0x20
#define T_PREFIX 0x21
#define T_STRING 0x22
#define T_SET 0x80
struct f_tree {
struct f_tree *left, *right;
struct f_val from, to;
void *data;
};
#define NEW_F_VAL struct f_val * val; val = cfg_alloc(sizeof(struct f_val));
#endif
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