b940579115
A filter should log messages only if executed explicitly (e.g., during route export or route import). When a filter is executed for technical reasons (e.g., to establish whether a route was exported before), it should run silently.
232 lines
5.5 KiB
C
232 lines
5.5 KiB
C
/*
|
|
* 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"
|
|
#include "nest/route.h"
|
|
#include "nest/attrs.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;
|
|
int lineno;
|
|
};
|
|
|
|
#define arg1 a1.p
|
|
#define arg2 a2.p
|
|
|
|
/* Not enough fields in f_inst for three args used by roa_check() */
|
|
struct f_inst_roa_check {
|
|
struct f_inst i;
|
|
struct roa_table_config *rtc;
|
|
};
|
|
|
|
struct f_inst3 {
|
|
struct f_inst i;
|
|
union {
|
|
int i;
|
|
void *p;
|
|
} a3;
|
|
};
|
|
|
|
#define INST3(x) (((struct f_inst3 *) x)->a3)
|
|
|
|
|
|
struct f_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 {
|
|
uint i;
|
|
u64 ec;
|
|
lcomm lc;
|
|
/* ip_addr ip; Folded into prefix */
|
|
struct f_prefix px;
|
|
char *s;
|
|
struct f_tree *t;
|
|
struct f_trie *ti;
|
|
struct adata *ad;
|
|
struct f_path_mask *path_mask;
|
|
} val;
|
|
};
|
|
|
|
struct filter {
|
|
char *name;
|
|
struct f_inst *root;
|
|
};
|
|
|
|
struct f_inst *f_new_inst(void);
|
|
struct f_inst *f_new_dynamic_attr(int type, int f_type, int code); /* Type as core knows it, type as filters know it, and code of dynamic attribute */
|
|
struct f_tree *f_new_tree(void);
|
|
struct f_inst *f_generate_complex(int operation, int operation_aux, struct f_inst *dyn, struct f_inst *argument);
|
|
struct f_inst *f_generate_roa_check(struct symbol *sym, struct f_inst *prefix, struct f_inst *asn);
|
|
|
|
|
|
struct f_tree *build_tree(struct f_tree *);
|
|
struct f_tree *find_tree(struct f_tree *t, struct f_val val);
|
|
int same_tree(struct f_tree *t1, struct f_tree *t2);
|
|
void tree_format(struct f_tree *t, buffer *buf);
|
|
|
|
struct f_trie *f_new_trie(linpool *lp, uint node_size);
|
|
void *trie_add_prefix(struct f_trie *t, ip_addr px, int plen, int l, int h);
|
|
int trie_match_prefix(struct f_trie *t, ip_addr px, int plen);
|
|
int trie_same(struct f_trie *t1, struct f_trie *t2);
|
|
void trie_format(struct f_trie *t, buffer *buf);
|
|
|
|
void fprefix_get_bounds(struct f_prefix *px, int *l, int *h);
|
|
|
|
static inline void
|
|
trie_add_fprefix(struct f_trie *t, struct f_prefix *px)
|
|
{
|
|
int l, h;
|
|
fprefix_get_bounds(px, &l, &h);
|
|
trie_add_prefix(t, px->ip, px->len & LEN_MASK, l, h);
|
|
}
|
|
|
|
static inline int
|
|
trie_match_fprefix(struct f_trie *t, struct f_prefix *px)
|
|
{
|
|
return trie_match_prefix(t, px->ip, px->len & LEN_MASK);
|
|
}
|
|
|
|
|
|
struct ea_list;
|
|
struct rte;
|
|
|
|
int f_run(struct filter *filter, struct rte **rte, struct ea_list **tmp_attrs, struct linpool *tmp_pool, int flags);
|
|
struct f_val f_eval_rte(struct f_inst *expr, struct rte **rte, struct linpool *tmp_pool);
|
|
struct f_val f_eval(struct f_inst *expr, struct linpool *tmp_pool);
|
|
uint f_eval_int(struct f_inst *expr);
|
|
u32 f_eval_asn(struct f_inst *expr);
|
|
|
|
char *filter_name(struct filter *filter);
|
|
int filter_same(struct filter *new, struct filter *old);
|
|
|
|
int i_same(struct f_inst *f1, struct f_inst *f2);
|
|
|
|
int val_compare(struct f_val v1, struct f_val v2);
|
|
int val_same(struct f_val v1, struct f_val v2);
|
|
|
|
void val_format(struct f_val v, buffer *buf);
|
|
|
|
|
|
#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
|
|
|
|
/* User visible types, which fit in int */
|
|
#define T_INT 0x10
|
|
#define T_BOOL 0x11
|
|
#define T_PAIR 0x12 /* Notice that pair is stored as integer: first << 16 | second */
|
|
#define T_QUAD 0x13
|
|
|
|
/* Put enumerational types in 0x30..0x3f range */
|
|
#define T_ENUM_LO 0x30
|
|
#define T_ENUM_HI 0x3f
|
|
|
|
#define T_ENUM_RTS 0x30
|
|
#define T_ENUM_BGP_ORIGIN 0x31
|
|
#define T_ENUM_SCOPE 0x32
|
|
#define T_ENUM_RTC 0x33
|
|
#define T_ENUM_RTD 0x34
|
|
#define T_ENUM_ROA 0x35
|
|
#define T_ENUM_RA_PREFERENCE 0x36
|
|
/* new enums go here */
|
|
#define T_ENUM_EMPTY 0x3f /* Special hack for atomic_aggr */
|
|
|
|
#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_PATH_MASK 0x23 /* mask for BGP path */
|
|
#define T_PATH 0x24 /* BGP path */
|
|
#define T_CLIST 0x25 /* Community list */
|
|
#define T_EC 0x26 /* Extended community value, u64 */
|
|
#define T_ECLIST 0x27 /* Extended community list */
|
|
#define T_LC 0x28 /* Large community value, lcomm */
|
|
#define T_LCLIST 0x29 /* Large community list */
|
|
|
|
#define T_RETURN 0x40
|
|
#define T_SET 0x80
|
|
#define T_PREFIX_SET 0x81
|
|
|
|
|
|
#define SA_FROM 1
|
|
#define SA_GW 2
|
|
#define SA_NET 3
|
|
#define SA_PROTO 4
|
|
#define SA_SOURCE 5
|
|
#define SA_SCOPE 6
|
|
#define SA_CAST 7
|
|
#define SA_DEST 8
|
|
#define SA_IFNAME 9
|
|
#define SA_IFINDEX 10
|
|
|
|
|
|
struct f_tree {
|
|
struct f_tree *left, *right;
|
|
struct f_val from, to;
|
|
void *data;
|
|
};
|
|
|
|
struct f_trie_node
|
|
{
|
|
ip_addr addr, mask, accept;
|
|
int plen;
|
|
struct f_trie_node *c[2];
|
|
};
|
|
|
|
struct f_trie
|
|
{
|
|
linpool *lp;
|
|
int zero;
|
|
uint node_size;
|
|
struct f_trie_node root[0]; /* Root trie node follows */
|
|
};
|
|
|
|
#define NEW_F_VAL struct f_val * val; val = cfg_alloc(sizeof(struct f_val));
|
|
|
|
#define FF_FORCE_TMPATTR 1 /* Force all attributes to be temporary */
|
|
#define FF_SILENT 2 /* Silent filter execution */
|
|
|
|
#endif
|