netdev - Re: [PATCH] [TPROXY] implemented IP_RECVORIGDSTADDR socket option

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Date:	Thu, 13 Nov 2008 12:37:46 +0100
From:	Balazs Scheidler <bazsi@...abit.hu>
To:	Rémi Denis-Courmont 
	<remi.denis-courmont@...ia.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] [TPROXY] implemented IP_RECVORIGDSTADDR socket option

On Thu, 2008-11-13 at 13:09 +0200, Rémi Denis-Courmont wrote:
> On Thursday 13 November 2008 12:37:04 ext Balazs Scheidler, you wrote:
> > In case UDP traffic is redirected to a local UDP socket,
> > the originally addressed destination address/port
> > cannot be recovered with the in-kernel tproxy.
> >
> > This patch adds an IP_RECVORIGDSTADDR sockopt that enables
> > a IP_ORIGDSTADDR ancillary message in recvmsg(). This
> > ancillary message contains the original destination address/port
> > of the packet being received.
> 
> Does this not duplicate the IP_PKTINFO functionality?
> 

IP_PKTINFO does not have a port number field which may be changed with
tproxy redirections.

-- 
Bazsi


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