tcf_nat
#define to_tcf_nat(a) ((struct tcf_nat *)a)
struct tcf_nat *p = to_tcf_nat(a);
const struct tcf_nat *p = to_tcf_nat(a);
struct tcf_nat *p = to_tcf_nat(a);
.size = sizeof(struct tcf_nat),
struct tcf_nat *p;