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Re: [tcpm] poll for adoption of draft-ananth-persist-02

Joe Touch <touch@ISI.EDU> Sat, 03 April 2010 18:01 UTC

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Date: Sat, 03 Apr 2010 10:59:42 -0700
From: Joe Touch <touch@ISI.EDU>
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Cc: "tcpm@ietf.org" <tcpm@ietf.org>, Murali Bashyam <MBashyam@ocarinanetworks.com>, mallman@icir.org
Subject: Re: [tcpm] poll for adoption of draft-ananth-persist-02
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John Heffner wrote:
> On Thu, Apr 1, 2010 at 3:53 PM, Mark Allman <mallman@icir.org> wrote:
>>> There are other aspects too, it's also important for the application
>>> to control the duration that the connection spends in persist state,
>>> this is planned to be accomplished via a socket option.
>> Why?
>>
>> I mean, sure, an app may want to not let a connection hang around
>> forever.  But, can't it just ABORT whenever it wants?
> 
> I suspect one reason this has become an issue is that the sockets
> interface does not provide ABORT semantics, so it's not possible on
> most operating systems to write an application that is able to avoid
> tying up kernel memory.  I'm not sure this is an IETF issue, though.

I don't think so either. RFC 793 specifies an API (including ABORT), but
not how it is instantiated.

It looks like this is already possible, though:

Linux has abort via: CLOSE after SO_LINGER(l_onoff=nonzero, l_linger=0)

FreeBSD has a sysctl_drop accessible by TCPCTL_DROP

There appears to be a userland command for this called tcpdrop, too.

Joe

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