netdev - Re: Question regarding expected behavior of two udp sockets with SO

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Date:	Sat, 20 Nov 2010 16:44:47 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Neil Horman <nhorman@...driver.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: Question regarding expected behavior of two udp sockets with
 SO_REUSEADDR set

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 :)



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