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

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Message-Id: <20151119.195504.2050784646947745419.davem@davemloft.net>
Date:	Thu, 19 Nov 2015 19:55:04 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	lorenzo@...gle.com
Cc:	hannes@...essinduktion.org, eric.dumazet@...il.com,
	stephen@...workplumber.org, netdev@...r.kernel.org,
	edumazet@...gle.com, ek@...gle.com, maze@...gle.com,
	dtor@...gle.com
Subject: Re: Add a SOCK_DESTROY operation to close sockets from userspace

From: Lorenzo Colitti <lorenzo@...gle.com>
Date: Fri, 20 Nov 2015 09:19:25 +0900

> In this case, userspace knows that that app's connections are now
> unusable because it configured an iptables rule to block them. The
> kernel doesn't really know until it the time comes to send a packet,
> and maybe not even then.

Netfilter could perform signalling on skb->sk when it drops packets.

Your example is actually a argument _for_ doing this in the kernel.

:-)
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