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

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Date:	Tue, 16 Feb 2010 23:22:13 +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>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [net-next PATCH v4 0/3] net: reserve ports for applications using fixed port

On Tuesday 16 February 2010 22:08:13 you wrote:
> > Something like bellow?
> >
> > # set bits 8080 and 1666
> > $echo 8080 1666-1666 > /proc
> >
> > #reset bit 1666
> > $echo 8080 > /proc
> >
> > #reset whole bitmap
> > $echo > /proc
> 
> Yes. So something like that.
> 
> I think I would use commas instead of spaces as that is more traditional.
> 

OK, I was trying to reuse the existing skip whitespace code :) but if you 
think its cleaner with commas I can do that.

> > 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.
> 
> Do we want userspace to see this implementation detail? Two data structures
>  doing the almost the same thing could get confusing in a hurry.  It feels
>  like a recipe for changing one and not the other and then running around
>  trying to figure out why the change did not work.
> 

Yes, I believe we want to have reserved_ports contain just those special ports 
that the user wants to reserve. After all we add this entry for this specific 
purpose. 


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