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

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Message-ID: <1447970875.22599.265.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 19 Nov 2015 14:07:55 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Herbert <tom@...bertland.com>
Cc:	David Miller <davem@...emloft.net>,
	zenczykowski <zenczykowski@...il.com>,
	Lorenzo Colitti <lorenzo@...gle.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>, Erik Kline <ek@...gle.com>,
	Dmitry Torokhov <dtor@...gle.com>
Subject: Re: Add a SOCK_DESTROY operation to close sockets from userspace

On Thu, 2015-11-19 at 13:53 -0800, Tom Herbert wrote:

> That covers the case where the local address is removed, but the not
> the case where the network manager is informed of an error in the path
> and wants to signal the application. My understanding was that
> SIOCKILLADDR would work for the first case, but this patch was need to
> cover the second case.
> 
> btw, instead of closing the TCP socket can we just report an error and
> wake up the application without affecting the connection? That is this
> just becomes an error on the socket. The response by the application
> will be the same in any case, porbablly just close the socket and try
> to reestablish the connection.

I thought this was the patch intent ?

Application gets a EPOLLIN|EPOLLOUT|POLLERR notification (if it is
willing to receive it, or blocked in a socket syscall) and closes the
socket.

         sk->sk_err = ETIMEDOUT;
         sk->sk_error_report(sk);
         tcp_done(sk);

If this sequence is not doing the job, then we have other worries in our
stack.



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