[Kea-users] Feature request: Control when "evaluate-additional-classes" is executed

[Peter Davies]

Hi Jonas, 

Thank you for your interest in Kea. 




Please create a feature request issue at [ https://gitlab.isc.org/isc-projects/kea | https://gitlab.isc.org/isc-projects/kea . ] 

You can attach any configurations to the gitlab issue. 




Kind Regards Peter 

ISC Support 

From: "Kea-users at lists.isc.org" <kea-users at lists.isc.org> 
To: "Kea-users at lists.isc.org" <kea-users at lists.isc.org> 
Cc: "Jonas Alfredsson" <jonas.alfredsson at protonmail.com> 
Sent: Friday, 3 January, 2025 11:02:23 
Subject: [Kea-users] Feature request: Control when "evaluate-additional-classes" is executed 

Hi, 

With Kea 2.7.5 it is now possible to add a "client-classes" limit to the pool 
argument like this: 

{ 
"pool": "172.27.140.2-172.27.140.10", 
"client-classes": ["k8s-node", "special-k8s-node"] 
}, 
{ 
"pool": "172.27.140.20-172.27.140.30", 
"client-classes": ["not-k8s-node"] 
} 

This is nice, but I ran into an issue where when we mark these classes with 
"only-in-additional-list": true, they are only evaluated after a pool has 
been selected, thus these pools will never be chosen unless we remove the 
late evaluation from the class definitions (which would mean that all 
requests are classified, even though it is only relevant for a single 
subnet). 

My suggestion/request would be that these "only-in-additional-list" are 
evaluated at the level where the "evaluate-additional-classes" is defined. 
So if we have the following configuration: 

"subnet4": [{ 
"id": 1, 
"subnet": "172.27.140.0/26", 
"evaluate-additional-classes": [ 
"k8s-node", 
"special-k8s-node", 
"not-k8s-node" 
], 
"pools": { ... } 
}] 

The classes defined in that list are evaluated when the subnet has been chosen, 
but before the actual pool has been chosen. 

I will attach a complete config file to provide more context to what I am 
trying to achieve, and I am looking forward to hear what you think of this. 

Best regards, 
Jonas 



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