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

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Message-ID: <CAKD1Yr1vsdrxb6YvOB3bbxuLso+hniexWDciOeWvv1fnyfYP1w@mail.gmail.com>
Date:	Thu, 3 Dec 2015 01:30:48 +0900
From:	Lorenzo Colitti <lorenzo@...gle.com>
To:	Tom Herbert <tom@...bertland.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Erik Kline <ek@...gle.com>,
	Maciej Żenczykowski <zenczykowski@...il.com>
Subject: Re: Add a SOCK_DESTROY operation to close sockets from userspace

On Thu, Dec 3, 2015 at 1:12 AM, Tom Herbert <tom@...bertland.com> wrote:
> The in kernel caller would already have a pointer to the socket so the
> call would just be sk->sk_prot->destroy(sk). That call should make its
> way down to same backend function in TCP that the diag path would use.
> We need this in the kernel for the same reasons you want this in
> userspace, if a third party hits an unrecoverable error on the socket
> it needs to signal this condition to the owner of the socket but can't
> actually close the socket (useful to RDS, KCM, probably
> TLS-in-kernel).

Oh, I see, yes. You're thinking of a case where multiple protocols
support this destroy operation. An in-kernel caller has a pointer to a
sk that it wants to unwedge, but doesn't need to know which destroy
function to use for which protocol, it just does "if
(sk->sk_prot->destroy != NULL) sk->sk_prot_destroy(sk)". I think that
should be a trivial change on top of what I have.
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