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From: Eric Dumazet <eric.dumazet@gmail.com>
To: Neil Horman <nhorman@tuxdriver.com>
Cc: netdev@vger.kernel.org, davem@davemloft.net
Subject: Re: Question regarding expected behavior of two udp sockets with SO_REUSEADDR set
Date: Sat, 20 Nov 2010 16:44:47 +0100	[thread overview]
Message-ID: <1290267887.2756.75.camel@edumazet-laptop> (raw)
In-Reply-To: <20101120150441.GA17907@hmsreliant.think-freely.org>

Le samedi 20 novembre 2010 à 10:04 -0500, Neil Horman a écrit :

> Agreed.  My thought was to add logic to udp_lib_lport_inuse such that, if
> sk_reuse is set on both sockets, and the input snum is 0 (indicating autobind)
> we should not allow binding sk to inet_sk(sk2)->num.  Thoughts?

I dont know, problem is this could be possible right now if sk2 is bound
on 127.0.0.2 address. Adding this test would reduce possible space.

Autobind is tricky, it chooses a port while address is part of the
problem.

Some loopback scalability problems could be solved if full range of
127.0.0.0/8 addresses were used, avoiding the dst refcount false
sharing :)




  parent reply	other threads:[~2010-11-20 15:44 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-11-20  0:48 Question regarding expected behavior of two udp sockets with SO_REUSEADDR set Neil Horman
2010-11-20  4:06 ` Eric Dumazet
2010-11-20 15:04   ` Neil Horman
2010-11-20 15:38     ` Eric Dumazet
2010-11-20 15:44     ` Eric Dumazet [this message]
2010-11-21  0:50       ` Neil Horman

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