netdev - Re: AF_PACKET how to get the original netdev from a packet received from a bonded master

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Date:	Mon, 23 Apr 2007 12:03:30 -0700
From:	"Laurent Chavey" <chavey@...gle.com>
To:	"Chris Leech" <chris.leech@...il.com>
Cc:	"David Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: AF_PACKET how to get the original netdev from a packet received from a bonded master

Thank you for the pointer, I am looking at the patch ad
see if it help. In my case, that will do the trick, but as mentioned
by Dave it may not have its place in a general distro.

Perso I would rather "cloning" <-- do not flame me, it is not my intent to
                                                 open a long thread :-)
          the skb received on the bond and pass the clone + original skb
          to the tap. This gives a "symetrical" behavior to the tap...

Some of the point made for LLDP etc... may not require this
patch if one adds the processing as a protocol.

Thank you.

On 4/18/07, Chris Leech <chris.leech@...il.com> wrote:
> On 4/18/07, David Miller <davem@...emloft.net> wrote:
> > From: "Laurent Chavey" <chavey@...gle.com>
> > Date: Wed, 18 Apr 2007 16:05:27 -0700
> >
> > > When using PF_PACKET socket with bonded interfaces, there is no
> > > way to get the slave interface (physical interface) the packet was
> > > actually received on.
> >
> > That's right.
> >
> > There isn't a real good solution to this problem either.
> > Decapsulation can happen to arbitrary levels, how many
> > devices should we remember and how to do the reference
> > counting on that correctly?
> >
> > As such, I don't think this will ever be provided.
>
> PJ Waskiewicz posted a patch that introduced a new socket option for
> PF_PACKET sockets to return the orig_dev->ifindex instead of
> dev->ifindex in sockaddr_ll.  He posted the patch on  March 8th.
>
> http://marc.info/?l=linux-kernel&m=117340678318939&w=2
>
> He also re-posted it on March 19th, at which point you (Dave) told him
> that it was in your backlog and he didn't need to keep resending it.
>
> To me it's seem like a decent opt-in solution for applications that
> might care, without changing existing behavior.  Laurent, would that
> change help you?  Dave, is there a reason you can see why this
> wouldn't work?
>
> - Chris
>
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