netdev - Re: [PATCH v1 net-next 5/8] tcp: Don't initialise tp->tsoffset in tcp_get_cookie

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Message-ID: <20231124214542.GC50352@kernel.org>
Date: Fri, 24 Nov 2023 21:45:42 +0000
From: Simon Horman <horms@...nel.org>
To: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v1 net-next 5/8] tcp: Don't initialise tp->tsoffset in
 tcp_get_cookie_sock().

On Wed, Nov 22, 2023 at 05:25:18PM -0800, Kuniyuki Iwashima wrote:
> When we create a full socket from SYN Cookie, we initialise
> tcp_sk(sk)->tsoffset redundantly in tcp_get_cookie_sock() as
> the field is inherited from tcp_rsk(req)->ts_off.
> 
>   cookie_v[46]_check
>   |- treq->ts_off = 0
>   `- tcp_get_cookie_sock
>      |- tcp_v[46]_syn_recv_sock
>      |  `- tcp_create_openreq_child
>      |	   `- newtp->tsoffset = treq->ts_off
>      `- tcp_sk(child)->tsoffset = tsoff
> 
> Let's initialise tcp_rsk(req)->ts_off with the correct offset
> and remove the second initialisation of tcp_sk(sk)->tsoffset.
> 
> Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>

Reviewed-by: Simon Horman <horms@...nel.org>