Re: [Technical Errata Reported] RFC8200 (5933)

Fernando Gont <fgont@si6networks.com> Wed, 11 December 2019 03:33 UTC

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Subject: Re: [Technical Errata Reported] RFC8200 (5933)
To: RFC Errata System <rfc-editor@rfc-editor.org>, bob.hinden@gmail.com, suresh@kaloom.com, evyncke@cisco.com, otroan@employees.org
Cc: ipv6@ietf.org
References: <20191211032724.46F77F406F3@rfc-editor.org>
From: Fernando Gont <fgont@si6networks.com>
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Date: Tue, 10 Dec 2019 22:32:47 -0500
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Folks,

I gave the relevant text yet another look and, besides the possible
clarification regarding the "intermmediate destinations", I've found a
bug in the corresponding text.

Namely, the text in RFC8200 rules out the processing of a Destination
Options header along the packet delivery's path *by the nodes listed in
a Routing Header*. That's of course an error -- otherwise there's no
point in including a Destination Options  header that precedes a routing
header.

The errata I've submitted clarifies the first item, and fixes the second.

Thanks,
Fernando




On 10/12/19 22:27, RFC Errata System wrote:
> The following errata report has been submitted for RFC8200,
> "Internet Protocol, Version 6 (IPv6) Specification".
> 
> --------------------------------------
> You may review the report below and at:
> https://www.rfc-editor.org/errata/eid5933
> 
> --------------------------------------
> Type: Technical
> Reported by: Fernando Gont <fgont@si6networks.com>
> 
> Section: 4
> 
> Original Text
> -------------
>    Extension headers (except for the Hop-by-Hop Options header) are not
>    processed, inserted, or deleted by any node along a packet's delivery
>    path, until the packet reaches the node (or each of the set of nodes,
>    in the case of multicast) identified in the Destination Address field
>    of the IPv6 header.
> 
>    The Hop-by-Hop Options header is not inserted or deleted, but may be
>    examined or processed by any node along a packet's delivery path,
>    until the packet reaches the node (or each of the set of nodes, in
>    the case of multicast) identified in the Destination Address field of
>    the IPv6 header.  The Hop-by-Hop Options header, when present, must
>    immediately follow the IPv6 header.  Its presence is indicated by the
>    value zero in the Next Header field of the IPv6 header.
> 
> 
> Corrected Text
> --------------
>    Extension headers (except for the Hop-by-Hop Options header, or a 
>    Destination Options header preceding a Routing header) are not processed,
>    inserted, or deleted by any node along a packet's delivery path, until the
>    packet reaches the final destination node (or each of the set of final
>    destination nodes, in the case of multicast). 
> 
>    For packets that do not include a Routing Header, the final destination
>    node is identified by the Destination Address field of the IPv6 header. 
>    For packets that include a Routing Header, the final destination node is 
>    identified by the Destination Address field of the IPv6 header only when
>    the Segments Left field of the Routing Header is 0. 
> 
>    The Hop-by-Hop Options header is not inserted or deleted, but may be
>    examined or processed by any node along a packet's delivery path,
>    until the packet reaches the final destination node (or each of the set of
>    final destination nodes, in the case of multicast). The Hop-by-Hop Options 
>    header, when present, must immediately follow the IPv6 header.  Its 
>    presence is indicated by the value zero in the Next Header field of the 
>    IPv6 header.
> 
>    A Destination Options header preceding a Routing Header is not
>    processed, inserted, or deleted by any node along a packet's delivery
>    path, until the packet reaches the destination node (or each of the set 
>    of destination nodes, in the case of multicast) identified by the 
>    Destination Address field of the IPv6 header. This means that  a 
>    Destination Options header preceding a Routing Header will be
>    processed by the first destination of the packet (specified by the
>    Destination Address field of the IPv6 header at the origin node) and by 
>    each node listed in the Routing Header.
> 
> Notes
> -----
> This errata clarifies two different issues:
> 
> * It clarifies that nodes other than the final destination do not insert o remove extension headers.
> 
> * It clarifies that the Destination Options header preceding a routing header *is* processed along the
>    packet delivery's path, but the node(s) identified by the Destination Address of the IPv6 header.
> 
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party  
> can log in to change the status and edit the report, if necessary. 
> 
> --------------------------------------
> RFC8200 (draft-ietf-6man-rfc2460bis-13)
> --------------------------------------
> Title               : Internet Protocol, Version 6 (IPv6) Specification
> Publication Date    : July 2017
> Author(s)           : S. Deering, R. Hinden
> Category            : INTERNET STANDARD
> Source              : IPv6 Maintenance
> Area                : Internet
> Stream              : IETF
> Verifying Party     : IESG
> 
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> 


-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
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