linux-kernel - Re: Misalignment, MIPS, and ip

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Date:   Sun, 11 Dec 2016 08:15:01 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Dan Lüdtke <mail@...rl.com>
Cc:     Daniel Kahn Gillmor <dkg@...thhorseman.net>,
        linux-mips@...ux-mips.org, Netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        WireGuard mailing list <wireguard@...ts.zx2c4.com>
Subject: Re: Misalignment, MIPS, and ip_hdr(skb)->version

On Sat, Dec 10, 2016 at 11:18:14PM +0100, Dan Lüdtke wrote:
> 
> > On 8 Dec 2016, at 05:34, Daniel Kahn Gillmor <dkg@...thhorseman.net> wrote:
> > 
> > On Wed 2016-12-07 19:30:34 -0500, Hannes Frederic Sowa wrote:
> >> Your custom protocol should be designed in a way you get an aligned ip
> >> header. Most protocols of the IETF follow this mantra and it is always
> >> possible to e.g. pad options so you end up on aligned boundaries for the
> >> next header.
> > 
> > fwiw, i'm not convinced that "most protocols of the IETF follow this
> > mantra".  we've had multiple discussions in different protocol groups
> > about shaving or bloating by a few bytes here or there in different
> > protocols, and i don't think anyone has brought up memory alignment as
> > an argument in any of the discussions i've followed.
> > 
> 
> If the trade-off is between 1 padding byte and 2 byte alignment versus
> 3 padding bytes and 4 byte alignment I would definitely opt for 3
> padding bytes. I know how that waste feels like to a protocol
> designer, but I think it is worth it. Maybe the padding/reserved will
> be useful some day for an additional feature.

Note, if you do do this (hint, I think it is a good idea), require that
these reserved/pad fields always set to 0 for now, so that no one puts
garbage in them and then if you later want to use them, it will be a
mess.

thanks,

greg k-h