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122 lines
2.4 KiB
C
122 lines
2.4 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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*
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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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struct f_inst { /* Instruction */
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struct f_inst *next; /* Structure is 16 bytes, anyway */
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u16 code;
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u16 aux;
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union {
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int i;
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void *p;
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} a1;
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union {
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int i;
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void *p;
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} a2;
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};
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#define arg1 a1.p
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#define arg2 a2.p
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struct prefix {
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ip_addr ip;
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int len;
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#define LEN_MASK 0xff
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#define LEN_PLUS 0x1000000
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#define LEN_MINUS 0x2000000
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#define LEN_RANGE 0x4000000
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/* If range then prefix must be in range (len >> 16 & 0xff, len >> 8 & 0xff) */
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};
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struct f_val {
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int type;
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union {
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int i;
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/* ip_addr ip; Folded into prefix */
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struct prefix px;
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char *s;
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struct f_tree *t;
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} val;
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};
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struct filter {
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char *name;
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struct f_inst *root;
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};
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void filters_postconfig(void);
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struct f_inst *f_new_inst(void);
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struct f_tree *f_new_tree(void);
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struct f_tree *build_tree(struct f_tree *);
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struct f_tree *find_tree(struct f_tree *t, struct f_val val);
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struct ea_list;
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struct rte;
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int f_run(struct filter *filter, struct rte **rte, struct ea_list **tmp_attrs, struct linpool *tmp_pool);
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char *filter_name(struct filter *filter);
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int val_compare(struct f_val v1, struct f_val v2);
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void val_print(struct f_val v);
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#define F_NOP 0
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#define F_NONL 1
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#define F_ACCEPT 2 /* Need to preserve ordering: accepts < rejects! */
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#define F_MODIFY 3 /* FIXME: Introduce modification flags instead? */
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#define F_REJECT 4
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#define F_ERROR 5
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#define F_QUITBIRD 6
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#define FILTER_ACCEPT NULL
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#define FILTER_REJECT ((void *) 1)
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/* Type numbers must be in 0..0xff range */
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#define T_MASK 0xff
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/* Internal types */
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/* Do not use type of zero, that way we'll see errors easier. */
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#define T_VOID 1
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#define T_RETURN 2
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/* User visible types, which fit in int */
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#define T_INT 0x10
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#define T_BOOL 0x11
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#define T_PAIR 0x12
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/* Put enumerational types in 0x30..0x7f range */
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#define T_ENUM_LO 0x30
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#define T_ENUM_HI 0x7f
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#define T_ENUM_RTS 0x30
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#define T_ENUM T_ENUM_LO ... T_ENUM_HI
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/* Bigger ones */
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#define T_IP 0x20
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#define T_PREFIX 0x21
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#define T_STRING 0x22
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#define T_SET 0x80
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struct f_tree {
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struct f_tree *left, *right;
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struct f_val from, to;
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void *data;
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};
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#define NEW_F_VAL struct f_val * val; val = cfg_alloc(sizeof(struct f_val));
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#endif
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