linux-kernel - Re: [RFC Patch] net: reserve ports for applications using fixed port numbers

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Message-Id: <201002031312.48531.opurdila@ixiacom.com>
Date:	Wed, 3 Feb 2010 13:12:48 +0200
From:	Octavian Purdila <opurdila@...acom.com>
To:	Amerigo Wang <amwang@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
	Neil Horman <nhorman@...driver.com>,
	linux-sctp@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: [RFC Patch] net: reserve ports for applications using fixed port numbers

On Wednesday 03 February 2010 06:30:07 you wrote:

> This patch introduces /proc/sys/net/ipv4/ip_local_reserved_ports,
> it can be used like ip_local_port_range, but this is used to
> reserve ports for third-party applications which use fixed
> port numbers within ip_local_port_range.
> 
> This only affects the applications which call socket functions
> like bind(2) with port number 0, to prevent the kernel getting the ports
> within the specified range for them. For applications which use fixed
> port number, it will have no effects.

It also affects the case where applications do connect, without previously 
doing bind, right?

> 
> Any comments are welcome.

I think it might be useful to allow setting individual ports as reserved, not 
only ranges, for example by using a bitmap. 


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