expr.h

#ifndef __EXPR_H__
#define __EXPR_H__

enum expression = {
    EXP_AND, EXP_OR, EXP_NOT, EXP_PRED,
};

struct expr_s * {
  enum expression type;
};

enum action = {
    ACT_NONE, ACT_ACCEPT, ACT_REJECT, ACT_DROP,
};

/* rule is a boolean expression of filtering predicates -> action */
struct rule_s {
  struct expr_s *expr;
  enum action act;
  struct rule_s *next;
};

struct group_s {
  char *name;
  struct rule_s *rule_list;
};

#endif /* __EXPR_H__ */