netdev - Re: Add a SOCK_DESTROY operation to close sockets from userspace

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Message-ID: <CAKD1Yr3jDozbnZsJy80uPFYAcqv+0ai0EN64i+jKorMe3-ggFA@mail.gmail.com>
Date:	Wed, 18 Nov 2015 23:45:46 +0900
From:	Lorenzo Colitti <lorenzo@...gle.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>, Erik Kline <ek@...gle.com>,
	Maciej Żenczykowski <maze@...gle.com>,
	Dmitry Torokhov <dtor@...gle.com>
Subject: Re: Add a SOCK_DESTROY operation to close sockets from userspace

On Wed, Nov 18, 2015 at 10:31 PM, Hannes Frederic Sowa
<hannes@...essinduktion.org> wrote:
> I was not saying using tcp_close literally, sorry for not making that
> clear, but just model the state transitions after tcp_close. At least it
> seems like a normal close to me.

But it shouldn't be a normal close. Consider calling SOCK_DESTROY on a
socket that is streaming data to a peer. If SOCK_DESTROY results in
the kernel sending a FIN, the remote side might think that the sender
closed the connection gracefully, even though the local side aborted
the connection.
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