linux-kernel - Re: [net-next PATCH v4 0/3] net: reserve ports for applications using fixed port

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Message-Id: <201002162151.04861.opurdila@ixiacom.com>
Date:	Tue, 16 Feb 2010 21:51:04 +0200
From:	Octavian Purdila <opurdila@...acom.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	David Miller <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Linux Kernel Developers <linux-kernel@...r.kernel.org>,
	Amerigo Wang <amwang@...hat.com>
Subject: Re: [net-next PATCH v4 0/3] net: reserve ports for applications using fixed port

On Tuesday 16 February 2010 20:49:37 you wrote:

> > The use case (large bitmaps/lists) is different enough from what we have
> > today  (small bitmaps) and that is why I think that we need this new
> > interface.
> >
> > If I get bitmap_parse_user correctly, for a 64k bitmap it expects a 2K
> > comma  separated values. That is not the most intuitively way for the
> > user to set a list of ports he wants to reserve.
> 
> In this case I expect an interface of comma separated ranges would be
> ideal.  Typically compact, and modifiable by writing the new value to
> the file.
> 

Something like bellow?

# set bits 8080 and 1666 
$echo 8080 1666-1666 > /proc

#reset bit 1666
$echo 8080 > /proc

#reset whole bitmap
$echo > /proc

> I think the default value would be something like 32768-61000.

Note that this new proc entry will work in conjunction with the existing 
ip_local_port_range option, so the default bitmap can (and should be) empty.
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