194 lines
4.6 KiB
C
194 lines
4.6 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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#include "nest/route.h"
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#include "nest/attrs.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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int lineno;
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};
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#define arg1 a1.p
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#define arg2 a2.p
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/* Not enough fields in f_inst for three args used by roa_check() */
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struct f_inst_roa_check {
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struct f_inst i;
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struct rtable_config *rtc;
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};
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struct f_prefix {
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net_addr net;
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u8 lo, hi;
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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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uint i;
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u64 ec;
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ip_addr ip;
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const net_addr *net;
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char *s;
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struct f_tree *t;
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struct f_trie *ti;
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struct adata *ad;
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struct f_path_mask *path_mask;
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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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struct f_inst *f_new_inst(void);
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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 */
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struct f_tree *f_new_tree(void);
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struct f_inst *f_generate_complex(int operation, int operation_aux, struct f_inst *dyn, struct f_inst *argument);
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struct f_inst *f_generate_roa_check(struct rtable_config *table, struct f_inst *prefix, struct f_inst *asn);
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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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int same_tree(struct f_tree *t1, struct f_tree *t2);
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void tree_format(struct f_tree *t, buffer *buf);
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struct f_trie *f_new_trie(linpool *lp, uint node_size);
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void *trie_add_prefix(struct f_trie *t, const net_addr *n, uint l, uint h);
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int trie_match_net(struct f_trie *t, const net_addr *n);
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int trie_same(struct f_trie *t1, struct f_trie *t2);
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void trie_format(struct f_trie *t, buffer *buf);
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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, int flags);
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struct f_val f_eval_rte(struct f_inst *expr, struct rte **rte, struct linpool *tmp_pool);
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struct f_val f_eval(struct f_inst *expr, struct linpool *tmp_pool);
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uint f_eval_int(struct f_inst *expr);
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u32 f_eval_asn(struct f_inst *expr);
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char *filter_name(struct filter *filter);
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int filter_same(struct filter *new, struct filter *old);
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int i_same(struct f_inst *f1, struct f_inst *f2);
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int val_compare(struct f_val v1, struct f_val v2);
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int val_same(struct f_val v1, struct f_val v2);
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void val_format(struct f_val v, buffer *buf);
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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_REJECT 3
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#define F_ERROR 4
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#define F_QUITBIRD 5
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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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/* 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 /* Notice that pair is stored as integer: first << 16 | second */
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#define T_QUAD 0x13
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/* Put enumerational types in 0x30..0x3f range */
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#define T_ENUM_LO 0x30
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#define T_ENUM_HI 0x3f
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#define T_ENUM_RTS 0x30
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#define T_ENUM_BGP_ORIGIN 0x31
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#define T_ENUM_SCOPE 0x32
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#define T_ENUM_RTC 0x33
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#define T_ENUM_RTD 0x34
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#define T_ENUM_ROA 0x35
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/* new enums go here */
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#define T_ENUM_EMPTY 0x3f /* Special hack for atomic_aggr */
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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_NET 0x21
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#define T_STRING 0x22
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#define T_PATH_MASK 0x23 /* mask for BGP path */
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#define T_PATH 0x24 /* BGP path */
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#define T_CLIST 0x25 /* Community list */
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#define T_ECLIST 0x26 /* Extended community list */
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#define T_EC 0x27 /* Extended community value, u64 */
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#define T_RETURN 0x40
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#define T_SET 0x80
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#define T_PREFIX_SET 0x81
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#define SA_FROM 1
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#define SA_GW 2
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#define SA_NET 3
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#define SA_PROTO 4
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#define SA_SOURCE 5
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#define SA_SCOPE 6
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#define SA_CAST 7
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#define SA_DEST 8
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#define SA_IFNAME 9
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#define SA_IFINDEX 10
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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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struct f_trie_node
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{
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ip_addr addr, mask, accept;
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int plen;
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struct f_trie_node *c[2];
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};
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struct f_trie
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{
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linpool *lp;
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int zero;
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uint node_size;
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struct f_trie_node root[0]; /* Root trie node follows */
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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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#define FF_FORCE_TMPATTR 1 /* Force all attributes to be temporary */
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#endif
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