void tcp_v4_destroy_sock(struct sock *sk)
{
	struct tcp_sock *tp = tcp_sk(sk);

	tcp_clear_xmit_timers(sk);

	tcp_cleanup_congestion_control(sk);

	/* Cleanup up the write buffer. */
	tcp_write_queue_purge(sk);

	/* Cleans up our, hopefully empty, out_of_order_queue. */
	skb_rbtree_purge(&tp->out_of_order_queue);

#ifdef CONFIG_TCP_MD5SIG
	/* Clean up the MD5 key list, if any */
	if (tp->md5sig_info) {
		tcp_clear_md5_list(sk);
		kfree_rcu(tp->md5sig_info, rcu);
		tp->md5sig_info = NULL;
	}
#endif

	/* Clean prequeue, it must be empty really */
	__skb_queue_purge(&tp->ucopy.prequeue);

	/* Clean up a referenced TCP bind bucket. */
	if (inet_csk(sk)->icsk_bind_hash)
		inet_put_port(sk);

	BUG_ON(tp->fastopen_rsk);

	/* If socket is aborted during connect operation */
	tcp_free_fastopen_req(tp);
	tcp_saved_syn_free(tp);

	local_bh_disable();
	sk_sockets_allocated_dec(sk);
	local_bh_enable();
}

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