draft-ietf-ipsecme-iptfs-08.txt   draft-ietf-ipsecme-iptfs-09.txt 
Network Working Group C. Hopps Network Working Group C. Hopps
Internet-Draft LabN Consulting, L.L.C. Internet-Draft LabN Consulting, L.L.C.
Intended status: Standards Track March 30, 2021 Intended status: Standards Track July 5, 2021
Expires: October 1, 2021 Expires: January 6, 2022
IP-TFS: Aggregation and Fragmentation Mode for ESP and its Use for IP IP-TFS: Aggregation and Fragmentation Mode for ESP and its Use for IP
Traffic Flow Security Traffic Flow Security
draft-ietf-ipsecme-iptfs-08 draft-ietf-ipsecme-iptfs-09
Abstract Abstract
This document describes a mechanism for aggregation and fragmentation This document describes a mechanism for aggregation and fragmentation
of IP packets when they are being encapsulated in ESP payload. This of IP packets when they are being encapsulated in ESP payload. This
new payload type can be used for various purposes such as decreasing new payload type can be used for various purposes such as decreasing
encapsulation overhead for small IP packets; however, the focus in encapsulation overhead for small IP packets; however, the focus in
this document is to enhance IPsec traffic flow security (IP-TFS) by this document is to enhance IPsec traffic flow security (IP-TFS) by
adding Traffic Flow Confidentiality (TFC) to encrypted IP adding Traffic Flow Confidentiality (TFC) to encrypted IP
encapsulated traffic. TFC is provided by obscuring the size and encapsulated traffic. TFC is provided by obscuring the size and
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on October 1, 2021. This Internet-Draft will expire on January 6, 2022.
Copyright Notice Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of (https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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While ESP guarantees an increasing sequence number with subsequently While ESP guarantees an increasing sequence number with subsequently
sent packets, it does not actually require the sequence numbers to be sent packets, it does not actually require the sequence numbers to be
generated with no gaps (e.g., sending only even numbered sequence generated with no gaps (e.g., sending only even numbered sequence
numbers would be allowed as long as they are always increasing). numbers would be allowed as long as they are always increasing).
Gaps in the sequence numbers will not work for this document so the Gaps in the sequence numbers will not work for this document so the
sequence number stream MUST increase monotonically by 1 for each sequence number stream MUST increase monotonically by 1 for each
subsequent packet. subsequent packet.
When using the AGGFRAG_PAYLOAD in conjunction with replay detection, When using the AGGFRAG_PAYLOAD in conjunction with replay detection,
the window size for both can be reduced to the smaller of the two the window size for both MAY be reduced to the smaller of the two
window sizes. This is because packets outside of the smaller window window sizes. This is because packets outside of the smaller window
but inside the larger would still be dropped by the mechanism with but inside the larger would still be dropped by the mechanism with
the smaller window size. the smaller window size. However, there is also no requirement to
make these values the same. Indeed, in some cases, such as slow
tunnels where a very small or zero reorder window size is
appropriate, the user may want a large replay detection window to log
replayed packets. Additionally, large replay windows can be
implemented with very little overhead compared to large reorder
windows.
Finally, as sequence numbers are reset when switching SAs (e.g., when Finally, as sequence numbers are reset when switching SAs (e.g., when
re-keying a child SA), senders MUST NOT send initial fragments of an re-keying a child SA), senders MUST NOT send initial fragments of an
inner packet using one SA and subsequent fragments in a different SA. inner packet using one SA and subsequent fragments in a different SA.
2.2.3.1. Optional Extra Padding 2.2.3.1. Optional Extra Padding
When the tunnel bandwidth is not being fully utilized, a sender MAY When the tunnel bandwidth is not being fully utilized, a sender MAY
pad-out the current encapsulating packet in order to deliver an inner pad-out the current encapsulating packet in order to deliver an inner
packet un-fragmented in the following outer packet. The benefit packet un-fragmented in the following outer packet. The benefit
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