NAT64_BIT_READY_IPV4
if (ISSET32(state->flags, NAT64_BIT_READY_IPV4)) {
#define NAT64_FLAG_READY (1 << NAT64_BIT_READY_IPV4)
ck_pr_bts_32(&state->flags, NAT64_BIT_READY_IPV4);
if (!ISSET32(state->flags, NAT64_BIT_READY_IPV4))
ck_pr_btr_32(&state->flags, NAT64_BIT_READY_IPV4);