Re: Add a SOCK_DESTROY operation to close sockets from userspace

[Hannes Frederic Sowa <hannes@stressinduktion.org>]

On Wed, Nov 18, 2015, at 15:45, Lorenzo Colitti wrote:
> On Wed, Nov 18, 2015 at 10:31 PM, Hannes Frederic Sowa
> <hannes@stressinduktion.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.

Oh, yes, I understand. The connection wasn't closed by the application
but by the administrator forcefully. So we should never indicate a
successful TCP shutdown with FIN but with RST. A TIME_WAIT period
actuallty still seems useful to me, maybe with different semantics, only
RST incoming data?

Bye,
Hannes