/* FIN arrived, enter true time-wait state. */
        tw->tw_substate      = TCP_TIME_WAIT;
        tcptw->tw_rcv_nxt = TCP_SKB_CB(skb)->end_seq;
        if (tmp_opt.saw_tstamp) {
            tcptw->tw_ts_recent_stamp = get_seconds();
            tcptw->tw_ts_recent      = tmp_opt.rcv_tsval;
        }

        /* I am shamed, but failed to make it more elegant.
         * Yes, it is direct reference to IP, which is impossible
         * to generalize to IPv6. Taking into account that IPv6
         * do not understand recycling in any case, it not
         * a big problem in practice. --ANK */
        if (tw->tw_family == AF_INET &&
            tcp_death_row.sysctl_tw_recycle && tcptw->tw_ts_recent_stamp &&
            tcp_v4_tw_remember_stamp(tw))
            inet_twsk_schedule(tw, &tcp_death_row, tw->tw_timeout,
                       TCP_TIMEWAIT_LEN);
        else
            inet_twsk_schedule(tw, &tcp_death_row, TCP_TIMEWAIT_LEN,
                       TCP_TIMEWAIT_LEN);

        return TCP_TW_ACK;
    }  如果TCP段序号不完全在接收窗口内，则返回TCP_TW_ACK，表示需要给对端发送ACK。
  如果在FIN_WAIT_2状态下接收到的是RST包，则跳转到kill标签处

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