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Filter: Recursive filter iteration code

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Add macros for recursive filter iteration that allows to examine
all instructions reachable from a filter.
This commit is contained in:
Ondrej Zajicek (work)
2021-02-07 19:21:42 +01:00
parent 5d414309ec
commit d06a875b04
7 changed files with 109 additions and 0 deletions
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36
filter/f-inst.h
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@@ -17,6 +17,7 @@
#include "conf/conf.h"
#include "filter/filter.h"
#include "filter/data.h"
#include "lib/buffer.h"
#include "lib/flowspec.h"
/* Flags for instructions */
@@ -50,6 +51,41 @@ static inline struct f_line *f_linearize(const struct f_inst *root)
void f_dump_line(const struct f_line *, uint indent);
/* Recursive iteration over filter instructions */
struct filter_iterator {
BUFFER_(const struct f_line *) lines;
};
void f_add_lines(const struct f_line_item *what, struct filter_iterator *fit);
#define FILTER_ITERATE_INIT(fit, filter, pool) \
({ \
BUFFER_INIT((fit)->lines, (pool), 32); \
BUFFER_PUSH((fit)->lines) = (filter)->root; \
})
#define FILTER_ITERATE(fit, fi) ({ \
const struct f_line *fl_; \
while (!BUFFER_EMPTY((fit)->lines)) \
{ \
BUFFER_POP((fit)->lines); \
fl_ = (fit)->lines.data[(fit)->lines.used]; \
for (uint i_ = 0; i_ < fl_->len; i_++) \
{ \
const struct f_line_item *fi = &fl_->items[i_]; \
f_add_lines(fi, (fit));
#define FILTER_ITERATE_END } } })
#define FILTER_ITERATE_CLEANUP(fit) \
({ \
mb_free((fit)->lines.data); \
memset((fit), 0, sizeof(struct filter_iterator)); \
})
struct filter *f_new_where(struct f_inst *);
static inline struct f_dynamic_attr f_new_dynamic_attr(u8 type, enum f_type f_type, uint code) /* Type as core knows it, type as filters know it, and code of dynamic attribute */
{ return (struct f_dynamic_attr) { .type = type, .f_type = f_type, .ea_code = code }; } /* f_type currently unused; will be handy for static type checking */