Hi Rob, Tom:
Renaming the modules sounds reasonable. With regard to have a different prefix, it is also ok. Perhaps the easiest way is to solve this is the following: instead of using -sdn- we could include -i2nsf- so we would have: ietf-i2nsf-common, ietf-i2nsf-ike, and ietf-i2nsf-ikeless. This would mean that this is in the context of i2nsf wg.
What do you think?
On 23/09/2020 11:24, Rob Wilton (rwilton) wrote: Hi Rafa,
Thanks for replying with the extra background information.
It seems like renaming the modules, as you propose for the -09 version, is the pragmatic path forward here.
And the namespace and the YANG prefix IMHO. Having ike as a prrefix for a module which is not the 'ike' module I see as a source of confusion. If this is nsf specific, then I would suggest nsfike although nsfikeless then seems a bit long. Tom Petch Regards,
Rob
From: Rafa Marin-Lopez <rafa@xxxxx>
Sent: 23 September 2020 10:29
To: Rob Wilton (rwilton) <rwilton@xxxxxxxxx>; Christian Hopps <chopps@xxxxxxxxxx>
Cc: Rafa Marin-Lopez <rafa@xxxxx>; i2nsf@xxxxxxxx; Gabriel Lopez <gabilm@xxxxx>; draft-ietf-i2nsf-sdn-ipsec-flow-protection.all@xxxxxxxx; ipsec@xxxxxxxx; last-call@xxxxxxxx; Martin Björklund <mbj+ietf@xxxxxxx>; yang-doctors@xxxxxxxx
Subject: Re: [I2nsf] [yang-doctors] Yangdoctors last call review of draft-ietf-i2nsf-sdn-ipsec-flow-protection-08
Hi Rob, (Chris):
Thank you very much for your answers. Please see our comments inline.
El 22 sept 2020, a las 17:38, Rob Wilton (rwilton) <rwilton=40cisco.com@xxxxxxxxxxxxxx<mailto:rwilton=40cisco.com@xxxxxxxxxxxxxx>> escribió:
Hi Rafa,
Thanks for getting back to me.
Yes, changing the name of the module is an okay, if not ideal, resolution. But I appreciate that you also want to be done with this work.
Correct, especially at this point of time. We have been discussing this I-D for a long time. There was a consensus in the WG. I2NSF WG chairs can comment about this. In our opinion, the changes that need to be applied are major changes from what it was approved in the WG. However, this is coming in the “last minute” and we feel this is not merely moving a few lines from here to there. We need to understand the impact of this. Therefore, it is not so trivial as it may seem. See below.
But I would like to check: My understanding is that the changes that Chris is proposing are pretty small. I.e. move the SA structure under ipsec-common, and put it under a YANG feature. Are you sure that it is impractical to accommodate this change which would allow a single ipsec module to be shared and extended via YANG augmentations?
In the context of our I-D, if we move SAD structure to ipsec-common, what we are meaning is that IPsec SA configuration data (setting values to the SAD structure) are common to the IKE case and the IKE-less cases, which are not. It is confusing. Moreover, the usage of feature means that, after all, this “common” is not “common” to both cases IKE case and IKE-less. Again, it seems confusing. In the IKE case, the SDN/I2NSF controller does not configure the SAD at all but the IKE implementation in the NSF. In our opinion, in order to properly add this IPsec SA operational state to the IKE case we should include operational data about the IPsec SAs (config false) to the ietf-ipsec-ike. Alternatively, we have certain operational data (ro) in the SAD structure in the IKE-less case. If only those are moved to the common part should be ok but we think it does not solve the problem.
Therefore it is not only an implementation aspect.
As you may observe, our discussion is taking into account there is an I2NSF Controller and we have two cases IKE case and IKE-less case, that have been discussed in the WG. The YANG model in the I-D has tried to reflect this discussion. It was never the intention to provide a general YANG model for IPsec.
Best Regards.
Thanks,
Rob
From: Rafa Marin-Lopez <rafa@xxxxx<mailto:rafa@xxxxx>>
Sent: 22 September 2020 14:05
To: Rob Wilton (rwilton) <rwilton@xxxxxxxxx<mailto:rwilton@xxxxxxxxx>>
Cc: Rafa Marin-Lopez <rafa@xxxxx<mailto:rafa@xxxxx>>; Christian Hopps <chopps@xxxxxxxxxx<mailto:chopps@xxxxxxxxxx>>; Gabriel Lopez <gabilm@xxxxx<mailto:gabilm@xxxxx>>; draft-ietf-i2nsf-sdn-ipsec-flow-protection.all@xxxxxxxx<mailto:draft-ietf-i2nsf-sdn-ipsec-flow-protection.all@xxxxxxxx>; i2nsf@xxxxxxxx<mailto:i2nsf@xxxxxxxx>; ipsec@xxxxxxxx<mailto:ipsec@xxxxxxxx>; last-call@xxxxxxxx<mailto:last-call@xxxxxxxx>; yang-doctors@xxxxxxxx<mailto:yang-doctors@xxxxxxxx>; Martin Björklund <mbj+ietf@xxxxxxx<mailto:mbj+ietf@xxxxxxx>>
Subject: Re: [yang-doctors] Yangdoctors last call review of draft-ietf-i2nsf-sdn-ipsec-flow-protection-08
Dear Rob:
Apologies for our delayed answer. We are now working in the revision to submit v09 by compiling all the comments.
As you mentioned, we want to avoid any further delay. As we mentioned to Chris in the past (i2nsf mailing list), we do not have any problem to include some additional text (e.g. “-sdn-" in the module names). Therefore, Rob, we agree with your point of view about this.
In summary, we are working in the next revision v09, and our idea to address Chris’ comments was to include -sdn- to the module names.
We hope this is fine.
Best regards.
El 22 sept 2020, a las 13:56, Rob Wilton (rwilton) <rwilton@xxxxxxxxx<mailto:rwilton@xxxxxxxxx>> escribió:
Hi draft authors, Chris,
Can we also please try and close on this issue raised by Chris.
Chris, I don’t think that there is any great way to solve this issue using YANG features, but presumably the constraint could be enforced with a must statement, or groupings could be used to copy parts of the ipsec structure into an sdn specific ipsec tree structure.
I understand that there isn't any great desire to delay these drafts by trying to generalize the ipsec YANG model contained within it. However, I think that means that the modules should have "-sdn-" in their names to indicate that they are intended specifically for the SDN use case, and should not be confused with the more generic ipsec YANG modules that have been proposed.
Regards,
Rob
-----Original Message-----
From: yang-doctors <yang-doctors-bounces@xxxxxxxx<mailto:yang-doctors-bounces@xxxxxxxx>> On Behalf Of Christian
Hopps
Sent: 24 August 2020 18:08
To: Martin Björklund <mbj+ietf@xxxxxxx<mailto:mbj+ietf@xxxxxxx>>
Cc: i2nsf@xxxxxxxx<mailto:i2nsf@xxxxxxxx>; draft-ietf-i2nsf-sdn-ipsec-flow-
protection.all@xxxxxxxx<mailto:protection.all@xxxxxxxx>; ipsec@xxxxxxxx<mailto:ipsec@xxxxxxxx>; last-call@xxxxxxxx<mailto:last-call@xxxxxxxx>; yang-
doctors@xxxxxxxx<mailto:doctors@xxxxxxxx>
Subject: Re: [yang-doctors] Yangdoctors last call review of draft-ietf-
i2nsf-sdn-ipsec-flow-protection-08
[adding in ipsec@]
Hi,
This draft was discussed in ipsecme at the last IETF, and there was a
desire to look closer at a couple changes that would make these models
usable by ipsec generally rather than only for SDNs. Otherwise we will end
up with 2 models that look very similar and duplicate almost all the
functionality. This was going to be done during the next yang doctor
review, but it looks like that happened in the meantime (ships in the
night).
At minimum the module names should include "-sdn-" if no other changes are
made to indicate that they are only for sdn use; however, this is not the
optimal solution.
A better solution would be to move the containers currently under ikeless
(for SA and Policy databases) under ipsec-common.
The feedback I received from the authors was that the SDN controllers
didn't care about the actual SAs and policies when using IKE so they
didn't want to require someone implementing ike+common modules to have to
support them.
The YANG question I suppose is, is there an easy way to move these
containers from ipsec-ikeless to ipsec-common, but still allow for them to
be empty and/or unimplemented for the SDN IKE use case? If they were made
features, is there a proper YANG way to indicate that if the ikeless
module is present then those features must also be supported thus matching
the functionality as defined by the current draft?
Thanks,
Chris.
On Aug 24, 2020, at 10:37 AM, Martin Björklund via Datatracker
<noreply@xxxxxxxx<mailto:noreply@xxxxxxxx>> wrote:
Reviewer: Martin Björklund
Review result: Ready with Nits
I did an early YANG Doctor's review of this draft. Most of my
comments then have been addressed in this version.
Comments:
o As I wrote in my early review, the RFC editor enforces a common
format of YANG modules, so it is better to adhere to this format
before sending the draft to the RFC editor. Use
pyang -f yang --yang-line-length 69 <FILE>
to get a consistent look-and-feel for your module.
(You will have to manually re-flow description statements after
this.)
o There are some leafs that are optional in the model, but w/o a
default value and w/o an explanation of what happens if that leaf
is not set. You should find those and either make them mandatory,
add a default value, or explain what it means when it isn't set.
As an example,
/ipsec-ike/pad/pad-entrypeer-authenticatin/pre-shared/secret
is optional. I suspect that this leaf needs to be mandatory.
Another example is the leaf espencap.
/martin
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Rafa Marin-Lopez, PhD
Dept. Information and Communications Engineering (DIIC)
Faculty of Computer Science-University of Murcia
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Telf: +34868888501 Fax: +34868884151 e-mail: rafa@xxxxx<mailto:rafa@xxxxx>
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Rafa Marin-Lopez, PhD
Dept. Information and Communications Engineering (DIIC)
Faculty of Computer Science-University of Murcia
30100 Murcia - Spain
Telf: +34868888501 Fax: +34868884151 e-mail: rafa@xxxxx<mailto:rafa@xxxxx>
-------------------------------------------------------
------------------------------------------------------- Rafa Marin-Lopez, PhD Dept. Information and Communications Engineering (DIIC) Faculty of Computer Science-University of Murcia 30100 Murcia - Spain Telf: +34868888501 Fax: +34868884151 e-mail: rafa@xxxxx-------------------------------------------------------
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