NAT64_BIT_STALE
if (ISSET32(state->flags, NAT64_BIT_STALE)) {
#define NAT64_FLAG_STALE (1 << NAT64_BIT_STALE)
if (ISSET32(state->flags, NAT64_BIT_STALE))
ck_pr_bts_32(&state->flags, NAT64_BIT_STALE);
if (ISSET32(state->flags, NAT64_BIT_STALE)) {