prepare_rule
if (prepare_rule(id, PF_RULESET_RDR, src, dst, d_port) == -1)
int prepare_rule(u_int32_t, int, struct sockaddr *, struct sockaddr *,
if (prepare_rule(id, PF_RULESET_FILTER, src, dst, d_port) == -1)
if (prepare_rule(id, PF_RULESET_NAT, src, dst, d_port) == -1)