From owner-freebsd-net  Wed Jun 27 21:27:13 2001
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Date: Wed, 27 Jun 2001 23:27:00 -0500
From: Alfred Perlstein <bright@sneakerz.org>
To: Brooks Davis <brooks@one-eyed-alien.net>
Cc: Julian Elischer <julian@elischer.org>,
	Stuart Eichert <seichert@coopcomp.com>, net@FreeBSD.ORG,
	oppermann@monzoon.net
Subject: Re: Am I missing something?
Message-ID: <20010627232700.K74703@sneakerz.org>
References: <20010627170659.B30006@Odin.AC.HMC.Edu> <Pine.BSF.4.21.0106272009000.91536-100000@InterJet.elischer.org> <20010627190245.B12609@Odin.AC.HMC.Edu>
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In-Reply-To: <20010627190245.B12609@Odin.AC.HMC.Edu>; from brooks@one-eyed-alien.net on Wed, Jun 27, 2001 at 07:02:45PM -0700
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* Brooks Davis <brooks@one-eyed-alien.net> [010627 21:02] wrote:
> On Wed, Jun 27, 2001 at 08:11:57PM -0700, Julian Elischer wrote:
> > I have a netgraph node written (but not yet released by the company that
> > asked me to write it) that when hooked to the 'orphans' hook of an
> > ethernet node, can filter out arbitrary Ethertypes and send them to
> > arbitrary hooks, so, by hooking this node to the ethernet node,
> > you can arbitrarily process as many or as few additional ethertypes as you
> > need to.
> 
> This doesn't let you hook on the Ethertype of a protocol currently
> supported in ether_input without breaking all the others.  Personaly,
> I'd like to be able to hook IP on one interface while allowing
> processing to proceed as normal on the others, but you can't do that
> with just an orphin's de-mux node if I'm reading the code correctly.

You're not reading it correctly. :(

        /* Handle ng_ether(4) processing, if any */
        if (ng_ether_input_p != NULL) {
                (*ng_ether_input_p)(ifp, &m, eh);
                if (m == NULL)
                        return;
        }

since it passes &m, you can set "*mp = NULL" in your handler if 
you wish to take control of the packet, or leave it as is to 
allow the normal course of action.

-Alfred

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