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bird2 ver 2.0.7

    1: /*
    2:  *	BIRD Internet Routing Daemon -- Filters
    3:  *
    4:  *	(c) 1999 Pavel Machek <pavel@ucw.cz>
    5:  *	(c) 2018--2019 Maria Matejka <mq@jmq.cz>
    6:  *
    7:  *	Can be freely distributed and used under the terms of the GNU GPL.
    8:  */
    9: 
   10: #ifndef _BIRD_FILT_H_
   11: #define _BIRD_FILT_H_
   12: 
   13: #include "lib/resource.h"
   14: #include "lib/ip.h"
   15: #include "lib/macro.h"
   16: #include "nest/route.h"
   17: #include "nest/attrs.h"
   18: 
   19: /* Possible return values of filter execution */
   20: enum filter_return {
   21:   F_NOP = 0,
   22:   F_NONL,
   23:   F_RETURN,
   24:   F_ACCEPT,   /* Need to preserve ordering: accepts < rejects! */
   25:   F_REJECT,
   26:   F_ERROR,
   27:   F_QUITBIRD,
   28: };
   29: 
   30: static inline const char *filter_return_str(const enum filter_return fret) {
   31:   switch (fret) {
   32: #define FRS(x) case x: return #x
   33:     FRS(F_NOP);
   34:     FRS(F_NONL);
   35:     FRS(F_RETURN);
   36:     FRS(F_ACCEPT);
   37:     FRS(F_REJECT);
   38:     FRS(F_ERROR);
   39:     FRS(F_QUITBIRD);
   40: #undef FRS
   41:     default: bug("This shall not happen");
   42:   }
   43: }
   44: 
   45: struct f_val;
   46: 
   47: /* The filter encapsulating structure to be pointed-to from outside */
   48: struct f_line;
   49: struct filter {
   50:   struct symbol *sym;
   51:   const struct f_line *root;
   52: };
   53: 
   54: struct rte;
   55: 
   56: enum filter_return f_run(const struct filter *filter, struct rte **rte, struct linpool *tmp_pool, int flags);
   57: enum filter_return f_eval_rte(const struct f_line *expr, struct rte **rte, struct linpool *tmp_pool);
   58: uint f_eval_int(const struct f_line *expr);
   59: enum filter_return f_eval_buf(const struct f_line *expr, struct linpool *tmp_pool, buffer *buf);
   60: 
   61: const char *filter_name(const struct filter *filter);
   62: int filter_same(const struct filter *new, const struct filter *old);
   63: int f_same(const struct f_line *f1, const struct f_line *f2);
   64: 
   65: void filter_commit(struct config *new, struct config *old);
   66: 
   67: void filters_dump_all(void);
   68: 
   69: #define FILTER_ACCEPT NULL
   70: #define FILTER_REJECT ((struct filter *) 1)
   71: #define FILTER_UNDEF  ((struct filter *) 2)	/* Used in BGP */
   72: 
   73: #define FF_SILENT 2			/* Silent filter execution */
   74: 
   75: /* Custom route attributes */
   76: struct custom_attribute {
   77:   resource r;
   78:   struct f_dynamic_attr *fda;
   79:   const char *name;
   80: };
   81: 
   82: struct custom_attribute *ca_lookup(pool *p, const char *name, int ea_type);
   83: 
   84: #endif