netdev - RE: [PATCH] IPv6 multicast routing

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Message-ID: <21C34AA2609529459A85739E2952066904A9670D@XCH-NW-9V1.nw.nos.boeing.com>
Date:	Thu, 22 Jan 2009 15:30:38 -0800
From:	"Goff, Thomas" <Thomas.Goff@...ing.com>
To:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
Cc:	<netdev@...r.kernel.org>,
	"Templin, Fred L" <Fred.L.Templin@...ing.com>
Subject: RE: [PATCH] IPv6 multicast routing

On Wed, Jan 21, 2009 at 10:04:31AM +0900, YOSHIFUJI Hideaki / 吉藤英明 wrote:

> >   - Enable/disable IPv6 multicast forwarding on the corresponding
> >     interface when a routing daemon adds/removes a multicast virtual
> >     interface.
:
> However, I believe configuring forwarding is user's responsibility
> and I'm not in favor of managing mc_forwarding automatically.
>
> If we go your way, we need to make the proc interface read-only, but
> you know, they will become non-"conf" interface. :-(
> And, well, we will introduce another possible overflow/underflow here...
>
> Another thought was to allow non-VIF routing settings (or manual settings).
>
> So, I decided to drop that bits.

Thanks for looking it over.

I think your approach to handling mc_forwarding makes sense, although
it differs from the IPv4 behavior.  In any case, it looks like the
current IPv4 and IPv6 multicast routing code does not consider an
interface's mc_forwarding value at all.

  Tom
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