Re: [Hipsec] Segmentation within HIP

Robert Moskowitz <rgm@htt-consult.com> Thu, 31 March 2016 21:54 UTC

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To: Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>, hipsec@ietf.org
References: <20160325224921.GA75376@cowbell.employees.org> <56FD3E40.9080200@ericsson.com>
From: Robert Moskowitz <rgm@htt-consult.com>
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Date: Thu, 31 Mar 2016 17:53:48 -0400
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Subject: Re: [Hipsec] Segmentation within HIP
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As I said, I am seeing this as part of a larger problem.  And am working 
on some ideas.

On 03/31/2016 11:12 AM, Gonzalo Camarillo wrote:
> Hi,
>
> when specified the HIP_DATA packets we noted the fragmentation problem
> but simply advised against sending large packets, which sure is not a
> great solution ;-)
>
> https://tools.ietf.org/html/rfc6078#section-6
>
> Cheers,
>
> Gonzalo
>
> On 26/03/2016 12:49 AM, Derek Fawcus wrote:
>> Recently I've been working on middlebox s/w:  Firewalls and NAT.
>>
>> One thing this has brought home to me is just how unreliable
>> fragmentation is on the current Internet.  NAT will often
>> simply break it (such that they can not be reassembled) or
>> just discard them,  and firewalls are often set up to block them.
>>
>> As such,  almost every protocol now would seem to need protocol
>> level segmentation/fragmentation,  rather than depend up IP
>> level fragmentation.
>>
>> It struck me that it should be quite simple to extend HIP to
>> support such.
>>
>> 1) Add a Controls bit which advertises that the sender supports
>>     segmentation.
>> 2) Define a new parameter,  numbered 1 such that it is first in
>>     the parameters,  and is critical.
>>     Within the parameter have a seqno/identifier, offset and
>>     more segments / final segment bit, possibly also a total
>>     size field.  Define some simple reassembly rules,  similar
>>     to those for IP fragments, such that one could reassemble
>>     a HIP packet larger than 2008 bytes if desired (how big?).
>> 3) Possibly also define a none critical parameter within the
>>     non signed,  non MACed range which advertises the max size
>>     packet the sender is willing to reassemble.  In fact I guess
>>     this might remove the need to use a Controls bit,  since it
>>     would imply the sender can reassemble.
>>
>> Then have a rule that once one party has seen the other party
>> advertise the segmentation capability within the current BEX
>> session, it is free to make use of segmentation towards that peer.
>>
>> Thoughts?
>>
>> DF
>>
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