* 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.
*/
#include "lib/resource.h"
#include "lib/ip.h"
+#include "lib/macro.h"
#include "nest/route.h"
#include "nest/attrs.h"
-struct f_inst { /* Instruction */
- struct f_inst *next; /* Structure is 16 bytes, anyway */
- u16 code; /* Instruction code, see the interpret() function and P() macro */
- u16 aux; /* Extension to instruction code, T_*, EA_*, EAF_* */
- union {
- int i;
- void *p;
- } a1; /* The first argument */
- union {
- int i;
- void *p;
- } a2; /* The second argument */
- 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 rtable_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 {
- net_addr net;
- u8 lo, hi;
-};
-
-struct f_val {
- int type; /* T_* */
- union {
- uint i;
- u64 ec;
- lcomm lc;
- ip_addr ip;
- const net_addr *net;
- char *s;
- struct f_tree *t;
- struct f_trie *ti;
- struct adata *ad;
- struct f_path_mask *path_mask;
- } val;
+/* 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 {
- char *name;
- struct f_inst *root;
+ struct symbol *sym;
+ const struct f_line *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 rtable_config *table, 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, const net_addr *n, uint l, uint h);
-int trie_match_net(struct f_trie *t, const net_addr *n);
-int trie_same(struct f_trie *t1, struct f_trie *t2);
-void trie_format(struct f_trie *t, buffer *buf);
-
-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);
+enum filter_return f_run(const struct filter *filter, struct rte **rte, struct linpool *tmp_pool, int flags);
+enum filter_return f_eval_rte(const struct f_line *expr, struct rte **rte, struct linpool *tmp_pool);
+uint f_eval_int(const struct f_line *expr);
+enum filter_return f_eval_buf(const struct f_line *expr, struct linpool *tmp_pool, buffer *buf);
-void val_format(struct f_val v, 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);
-#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
+void filters_dump_all(void);
#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_NETTYPE 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_NET 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_RD 0x2a /* Route distinguisher for VPN addresses */
-
-#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_DEST 7
-#define SA_IFNAME 8
-#define SA_IFINDEX 9
-
-
-struct f_tree {
- struct f_tree *left, *right;
- struct f_val from, to;
- void *data;
-};
-
-struct f_trie_node
-{
- ip_addr addr, mask, accept;
- uint 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 FILTER_REJECT ((struct filter *) 1)
+#define FILTER_UNDEF ((struct filter *) 2) /* Used in BGP */
-#define FF_FORCE_TMPATTR 1 /* Force all attributes to be temporary */
+#define FF_SILENT 2 /* Silent filter execution */
-/* Bird Tests */
-struct f_bt_test_suite {
- node n; /* Node in config->tests */
- struct f_inst *fn; /* Root of function */
- const char *fn_name; /* Name of test */
- const char *dsc; /* Description */
+/* Custom route attributes */
+struct custom_attribute {
+ resource r;
+ struct f_dynamic_attr *fda;
+ const char *name;
};
-/* Hook for call bt_assert() function in configuration */
-extern void (*bt_assert_hook)(int result, struct f_inst *assert);
+struct custom_attribute *ca_lookup(pool *p, const char *name, int ea_type);
#endif
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