netdev - Re: [PATCH net 3/7] tcp: resalt the secret every 10 seconds

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Date:   Wed, 27 Apr 2022 08:56:21 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Willy Tarreau <w@....eu>
Cc:     netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Moshe Kol <moshe.kol@...l.huji.ac.il>,
        Yossi Gilad <yossi.gilad@...l.huji.ac.il>,
        Amit Klein <aksecurity@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 3/7] tcp: resalt the secret every 10 seconds

On Wed, 27 Apr 2022 08:52:29 +0200
Willy Tarreau <w@....eu> wrote:

> From: Eric Dumazet <edumazet@...gle.com>
> 
> In order to limit the ability for an observer to recognize the source
> ports sequence used to contact a set of destinations, we should
> periodically shuffle the secret. 10 seconds looks effective enough
> without causing particular issues.
> 
> Cc: Moshe Kol <moshe.kol@...l.huji.ac.il>
> Cc: Yossi Gilad <yossi.gilad@...l.huji.ac.il>
> Cc: Amit Klein <aksecurity@...il.com>
> Tested-by: Willy Tarreau <w@....eu>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---
>  net/core/secure_seq.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/net/core/secure_seq.c b/net/core/secure_seq.c
> index 2cdd43a63f64..200ab4686275 100644
> --- a/net/core/secure_seq.c
> +++ b/net/core/secure_seq.c
> @@ -22,6 +22,8 @@
>  static siphash_aligned_key_t net_secret;
>  static siphash_aligned_key_t ts_secret;
>  

Rather than hard coding, why not have a sysctl knob for this?
That way the tinfoil types can set it smaller.