TCP_TIME_WAIT_BUCKETS
(((t) / MSEC_TO_TICK(TCP_TIME_WAIT_DELAY)) % TCP_TIME_WAIT_BUCKETS)
#define TW_BUCKET_NEXT(b) (((b) + 1) % TCP_TIME_WAIT_BUCKETS)
tcp_t *tcp_time_wait_bucket[TCP_TIME_WAIT_BUCKETS];