Implications of Oversized IPv6 Header Chains (RFC7112)
Original Publication Date: 2014-Jan-01
Included in the Prior Art Database: 2014-Jan-30
Internet Society Requests For Comment (RFCs)
F. Gont: AUTHOR [+3]
With IPv6, optional internet-layer information is carried in one or more IPv6 Extension Headers [RFC2460]. Extension Headers are placed between the IPv6 header and the Upper-Layer Header in a packet. The term "Header Chain" refers collectively to the IPv6 header, Extension Headers, and Upper-Layer Header occurring in a packet. In those scenarios in which the IPv6 Header Chain is unusually long and packets are fragmented, or scenarios in which the fragment size is very small, the Header Chain may span multiple fragments.
Internet Engineering Task Force (IETF) F. Gont Request for Comments: 7112 Huawei Technologies Updates: 2460 V. Manral Category: Standards Track Ionos Networks ISSN: 2070-1721 R. Bonica Juniper Networks January 2014
Implications of Oversized IPv6 Header Chains
The IPv6 specification allows IPv6 Header Chains of an arbitrary size. The specification also allows options that can, in turn, extend each of the headers. In those scenarios in which the IPv6 Header Chain or options are unusually long and packets are fragmented, or scenarios in which the fragment size is very small, the First Fragment of a packet may fail to include the entire IPv6 Header Chain. This document discusses the interoperability and security problems of such traffic, and updates RFC 2460 such that the First Fragment of a packet is required to contain the entire IPv6 Header Chain.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7112.
Gont, et al. Standards Track [Page 1]
RFC 7112 Implications of Oversized Header Chains January 2014
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