netdev - Re: [net-next PATCH v4 3/3] net: reserve ports for applications using fixed port numbers

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Message-ID: <4B7F96AE.1010102@redhat.com>
Date:	Sat, 20 Feb 2010 16:00:46 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Octavian Purdila <opurdila@...acom.com>,
	David Miller <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Linux Kernel Developers <linux-kernel@...r.kernel.org>,
	Neil Horman <nhorman@...driver.com>
Subject: Re: [net-next PATCH v4 3/3] net: reserve ports for applications using
 fixed port numbers

Eric Dumazet wrote:
> Le jeudi 18 février 2010 à 00:13 +0800, Cong Wang a écrit :
> 
>> I don't think so, if you want to avoid race condition, you just need to
>> write the reserved ports before any networking application starts, IOW,
>> as early as possible during boot.
>>
> 
> Sure, but I was thinking retrieving the list of reserved port by a
> database query, using network :)
> 
> Anyway, I just feel your argument is not applicable.
> 
> Our kernel is capable of doing an intersection for us, we dont need
> to forbid user to mark a port as 'reserved' if this port is already
> blacklisted by another mechanism (for example, if this port is already
> in use)
> 

Oh, I see your points.

But this still could make people confused, like me. I think we'd better
document this.

Thanks.
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