netdev - Re: [Patch v10 0/3] net: reserve ports for applications using fixed port numbers

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Date:	Mon, 10 May 2010 12:01:33 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Amerigo Wang <amwang@...hat.com>
CC:	linux-kernel@...r.kernel.org,
	Octavian Purdila <opurdila@...acom.com>, ebiederm@...ssion.com,
	Eric Dumazet <eric.dumazet@...il.com>,
	penguin-kernel@...ove.SAKURA.ne.jp, netdev@...r.kernel.org,
	Neil Horman <nhorman@...driver.com>, xiaosuo@...il.com,
	adobriyan@...il.com, David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Patch v10 0/3] net: reserve ports for applications using fixed
 port numbers

(Adding Andrew into Cc, hope can hear from him.)

On 05/05/10 18:26, Amerigo Wang wrote:
> Changes from the previous version:
> - Use 'true' and 'false' for bool's;
> - Fix some coding style problems;
> - Allow appending lines to bitmap proc file so that it will be
>    easier to add new bits.
>
> ------------------>
>
> This patch introduces /proc/sys/net/ipv4/ip_local_reserved_ports which
> allows users to reserve ports for third-party applications.
>
> The reserved ports will not be used by automatic port assignments
> (e.g. when calling connect() or bind() with port number 0). Explicit
> port allocation behavior is unchanged.
>
> There are still some miss behaviors with regard to proc parsing in odd
> invalid cases (for "40000\0-40001" all is acknowledged but only 40000
> is accepted) but they are not easy to fix without changing the current
> "acknowledge how much we accepted" behavior.
>
> Because of that and because the same issues are present in the
> existing proc_dointvec code as well I don't think its worth holding
> the actual feature (port reservation) after such petty error recovery
> issues.
>
>

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