Re: [netmod] WG Last Call: draft-ietf-netmod-acl-model-14

"Einar Nilsen-Nygaard (einarnn)" <einarnn@cisco.com> Wed, 13 December 2017 20:25 UTC

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From: "Einar Nilsen-Nygaard (einarnn)" <einarnn@cisco.com>
To: Mahesh Jethanandani <mjethanandani@gmail.com>
CC: Eliot Lear <lear@cisco.com>, Kristian Larsson <kristian@spritelink.net>, "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: [netmod] WG Last Call: draft-ietf-netmod-acl-model-14
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Date: Wed, 13 Dec 2017 20:25:02 +0000
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Subject: Re: [netmod] WG Last Call: draft-ietf-netmod-acl-model-14
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I’m happy to have a way to attach an ACL globally, but that’s orthogonal to attaching to an interface, isn’t it? Attaching ACLs directly to an interface doesn’t preclude global attachment in any way as far as I can see…or have I missed something? I’m not sure I understand why choices are an issue. The current proposal has this container:

module: ietf-access-control-list
    +--rw access-lists
       +--rw attachment-points
          +--rw interface* [interface-id] {interface-attachment}?
             +--rw interface-id    if:interface-ref
             +--rw ingress
             |  +--rw acl-sets
             |     +--rw acl-set* [name]
             |        +--rw name    -> ../../../../../../acl/name
             |        +--rw type?   -> ../../../../../../acl/type
             |        +--ro ace* [name] {interface-stats or interface-acl-aggregate}?
             |           +--ro name               -> ../../../../../../../acl/aces/ace/name
             |           +--ro matched-packets?   yang:counter64
             |           +--ro matched-octets?    yang:counter64
             +--rw egress
                +--rw acl-sets
                   +--rw acl-set* [name]
                      +--rw name    -> ../../../../../../acl/name
                      +--rw type?   -> ../../../../../../acl/type
                      +--ro ace* [name] {interface-stats or interface-acl-aggregate}?
                         +--ro name               -> ../../../../../../../acl/aces/ace/name
                         +--ro matched-packets?   yang:counter64
                         +--ro matched-octets?    yang:counter64

If we added some form of global attachment points, that might be a peer with the list of interface attachments, right? Because we’d need to support “global” and multiple “interface” attachments. It’s not an “or”, it’s an “and”. Or have I missed something?

Cheers,

Einar

On 13 Dec 2017, at 20:10, Mahesh Jethanandani <mjethanandani@gmail.com<mailto:mjethanandani@gmail.com>> wrote:

We want to support “global” attachment point down the line, and that “global” attachment point will be one of the choices (the other being the interface), what would this augment look like. Note, as far as I know, you cannot augment inside a choice node.

On Dec 13, 2017, at 6:57 AM, Einar Nilsen-Nygaard (einarnn) <einarnn@cisco.com<mailto:einarnn@cisco.com>> wrote:

Perhaps like this, as an augmentation to the interface:

  augment /if:interfaces/if:interface:
    +--rw ingress-acls
    |  +--rw acl-sets
    |     +--rw acl-set* [name]
    |        +--rw name              -> /access-lists/acl/name
    |        +--rw type?             -> /access-lists/acl/type
    |        +--ro ace-statistics* [name] {interface-stats}?
    |           +--ro name               -> /access-lists/acl/aces/ace/name
    |           +--ro matched-packets?   yang:counter64
    |           +--ro matched-octets?    yang:counter64
    +--rw egress-acls
       +--rw acl-sets
          +--rw acl-set* [name]
             +--rw name              -> /access-lists/acl/name
             +--rw type?             -> /access-lists/acl/type
             +--ro ace-statistics* [name] {interface-stats}?
                +--ro name               -> /access-lists/acl/aces/ace/name
                +--ro matched-packets?   yang:counter64
                +--ro matched-octets?    yang:counter64

Could also put an “aces” container above both these & rename “ingress-acls" to “ingress”, etc. to give a single root for the augmentation if preferred.

Cheers,

Einar


On 6 Dec 2017, at 19:43, Eliot Lear <lear@cisco.com<mailto:lear@cisco.com>> wrote:



On 12/6/17 7:23 PM, Mahesh Jethanandani wrote:
How does one move the interface attachment point, currently an
'interface-ref', to an augmentation of the if:interfaces/interface,
inside of the ‘acl’  container? Down the line we might need to have an
container for "attachment points" to accommodate the possibility of
attaching an ACL either to an interface or “globally”.


Keeping in mind that one use is that an ACL doesn't attach to an
interface at all.

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Mahesh Jethanandani
mjethanandani@gmail.com<mailto:mjethanandani@gmail.com>