netdev - Re: [PATCH 1/2] tcp: setup random timestamp offset when write

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Date:   Mon, 20 Feb 2017 10:18:07 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     alexey.kodanev@...cle.com
Cc:     netdev@...r.kernel.org, fw@...len.de, edumazet@...gle.com
Subject: Re: [PATCH 1/2] tcp: setup random timestamp offset when write_seq
 already set

From: Alexey Kodanev <alexey.kodanev@...cle.com>
Date: Sat, 18 Feb 2017 03:56:11 +0300

> @@ -232,12 +232,17 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
>  	sk->sk_gso_type = SKB_GSO_TCPV4;
>  	sk_setup_caps(sk, &rt->dst);
>  
> -	if (!tp->write_seq && likely(!tp->repair))
> +	if (!tp->write_seq && likely(!tp->repair)) {
>  		tp->write_seq = secure_tcp_sequence_number(inet->inet_saddr,
>  							   inet->inet_daddr,
>  							   inet->inet_sport,
>  							   usin->sin_port,
>  							   &tp->tsoffset);
> +	} else if (likely(!tp->repair)) {
> +		secure_tcp_sequence_number(inet->inet_saddr, inet->inet_daddr,
> +					   inet->inet_sport, usin->sin_port,
> +					   &tp->tsoffset);
> +	}

This would be so much easier to understand if it were coded as:

	if (!tp->repair) {
		seq = secure_tcp_sequence_number(...);
		if (!tp->write_seq)
			tp->write_seq = seq;
	}