netdev - Re: [PATCH] Multicast socket option

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Message-ID: <alpine.DEB.1.10.0905291008300.17436@gentwo.org>
Date:	Fri, 29 May 2009 10:12:18 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Neil Horman <nhorman@...driver.com>
cc:	Nivedita Singhvi <niv@...ibm.com>, netdev <netdev@...r.kernel.org>,
	David Stevens <dlstevens@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] Multicast socket option

On Fri, 29 May 2009, Neil Horman wrote:

> > diff -urN linux-2.6.29.2/net/ipv4/igmp.c linux-2.6.29.2.new/net/ipv4/igmp.c
> > --- linux-2.6.29.2/net/ipv4/igmp.c	2009-04-27 13:37:11.000000000 -0400
> > +++ linux-2.6.29.2.new/net/ipv4/igmp.c	2009-05-18 16:22:33.000000000 -0400
> > @@ -2196,7 +2196,7 @@
> > 			break;
> > 	}
> > 	if (!pmc)
> > -		return 1;
> > +		return inet->mc_all;
>
> This change also filters out broadcasts sent to sockets listening on a given
> port.  Is that what you want?

Look at the beginning of the function:

   if (!ipv4_is_multicast(loc_addr))
                return 1;


will return 1 for broadcast.

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