netdev - Re: [PATCH] tcp: disallow bind() to reuse addr/port

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Message-ID: <BANLkTi=176iFKUHn351OWOZUSaUBkgKf2Q@mail.gmail.com>
Date:	Wed, 27 Apr 2011 10:37:54 -0700
From:	"George B." <georgeb@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, daniel.baluta@...il.com,
	gasparch@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] tcp: disallow bind() to reuse addr/port

On Tue, Jan 11, 2011 at 2:03 PM, David Miller <davem@...emloft.net> wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Tue, 11 Jan 2011 12:14:22 +0100
>
>> [PATCH] tcp: disallow bind() to reuse addr/port
>>
>> inet_csk_bind_conflict() logic currently disallows a bind() if
>> it finds a friend socket (a socket bound on same address/port)
>> satisfying a set of conditions :
>>
>> 1) Current (to be bound) socket doesnt have sk_reuse set
>> OR
>> 2) other socket doesnt have sk_reuse set
>> OR
>> 3) other socket is in LISTEN state
>>
>> We should add the CLOSE state in the 3) condition, in order to avoid two
>> REUSEADDR sockets in CLOSE state with same local address/port, since
>> this can deny further operations.
>>
>> Note : a prior patch tried to address the problem in a different (and
>> buggy) way. (commit fda48a0d7a8412ced tcp: bind() fix when many ports
>> are bound).
>>
>> Reported-by: Gaspar Chilingarov <gasparch@...il.com>
>> Reported-by: Daniel Baluta <daniel.baluta@...il.com>
>> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
>
> Applied, thanks.
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OK, just saw this, so please disregard my earlier.

George
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