Re: Route Information Options in Redirect Messages (updated)

Lorenzo Colitti <lorenzo@google.com> Mon, 06 February 2017 01:27 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Mon, 6 Feb 2017 10:26:45 +0900
Message-ID: <CAKD1Yr2m-cOWZUn67DNJGi-Ofm_t5LEjKuCP1zaCGhXDCfE1ew@mail.gmail.com>
Subject: Re: Route Information Options in Redirect Messages (updated)
To: "Templin, Fred L" <Fred.L.Templin@boeing.com>
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Cc: james woodyatt <jhw@google.com>, IPv6 List <ipv6@ietf.org>
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I'm not sure about the security reliability and reliability of this scheme.
The first things that come to mind are:

What happens if the whole network is renumbered? Fundamentally, the entity
that is authoritative for the larger prefix (i.e., the one sending the
prefix redirect) is the one that controls routing to that prefix. What
happens if that entity realizes that the prefix is no longer valid, and
that thus the sub-prefixes are also no longer redirected? How does it
withdraw those redirects?

Second: security. I get the feeling that a lot of work needs to be done
here to cover all the corner cases. One obvious example is: suppose I have
2001:db8:1:1:/64 on link, and then some host sends an unsolicited RIO
announcing that it is responsible for 2001:db8:1:1:/64, or for both
2001:db8:1:1::/65 and 2001:db8:1:1:8000::/65. What happens? Hopefully the
host doesn't get to MITM all the traffic on the link.

Even assuming that a router actually legitimately redirects a sub-prefix to
a given node for a certain lifetime, what's to stop that node claiming that
sub-prefix even after the original lifetime has expired? Should the host
receiving the prefix redirect enforce that the prefix lifetime can never
increase?

More in general it looks like this document is trying to reinvent a fair
amount of stuff that's already covered in detail, and more robustly, in
homenet. Why not use those solutions instead?

On Wed, Feb 1, 2017 at 8:14 AM, Templin, Fred L <Fred.L.Templin@boeing.com>
wrote:

> An updated version of "Route Information Options in Redirect Messages" is
> now
> available (see below). This version addresses 6man list comments posted in
> the
> 1/9/2017 - 1/12/2017 timeframe, and re-aligns the work from intarea to
> 6man.
> It also expands on several aspects of the proposal that were not covered
> in the
> intarea draft. Please (re-)review and post comments to the list.
>
> Fred and James
>
> -----Original Message-----
> From: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] On Behalf Of
> internet-drafts@ietf.org
> Sent: Monday, January 30, 2017 2:33 PM
> To: i-d-announce@ietf.org
> Subject: I-D Action: draft-templin-6man-rio-redirect-01.txt
>
>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
>
>
>         Title           : Route Information Options in Redirect Messages
>         Authors         : Fred L. Templin
>                           James Woodyatt
>         Filename        : draft-templin-6man-rio-redirect-01.txt
>         Pages           : 7
>         Date            : 2017-01-30
>
> Abstract:
>    The IPv6 Neighbor Discovery protocol provides a Redirect function
>    allowing routers to inform recipients of a better next hop on the
>    link toward the destination.  This document specifies a backward-
>    compatible extension to the Redirect function to allow routers to
>    include routing information that the recipient can associate with the
>    next hop.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-templin-6man-rio-redirect/
>
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-templin-6man-rio-redirect-01
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-templin-6man-rio-redirect-01
>
>
> Please note that it may take a couple of minutes from the time of
> submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
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