linux-kernel - Re: [PATCH] net: tcp: accept old ack during closing

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Date: Thu, 11 Jan 2024 18:06:40 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: davem@...emloft.net, dsahern@...nel.org, kuba@...nel.org, 
	pabeni@...hat.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: tcp: accept old ack during closing

On Wed, Jan 10, 2024 at 6:41 PM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Wed, Jan 10, 2024 at 11:25 AM Eric Dumazet <edumazet@...gle.com> wrote:
> >
> > On Wed, Jan 10, 2024 at 4:08 AM Menglong Dong <menglong8.dong@...il.com> wrote:
> > >
> >
> > >
> > > Oops, It should be "SKB_DR_SET(reason, NOT_SPECIFIED);" here.
> > > Sorry that I shouldn't be too confident to compile it.
> > >
> >
> > net-next is closed, come back in ~two weeks, thanks.

Okay, I'll send the V2 after two weeks.

>
> Also look at commit d0e1a1b5a833b625c ("tcp: better validation of
> received ack sequences"), for some context.

Yeah, I already analyzed this commit before. I think that the return
value of tcp_ack() mean different thing to SYN_SEND and FIN_WAIT1
if it is zero, and should be handled separately.

Anyway, we can discuss this part when the net-next is opened.

Thanks!
Menglong Dong