linux-kernel - Re: [PATCH net-next 0/5] rtnetlink: add IFA_IF_NETNSID for RTM

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Date:   Thu, 30 Aug 2018 17:49:12 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Christian Brauner <christian.brauner@...onical.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net, kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
        pombredanne@...b.com, kstewart@...uxfoundation.org,
        gregkh@...uxfoundation.org, dsahern@...il.com, fw@...len.de,
        lucien.xin@...il.com, jakub.kicinski@...ronome.com,
        jbenc@...hat.com
Subject: Re: [PATCH net-next 0/5] rtnetlink: add IFA_IF_NETNSID for
 RTM_GETADDR

Le 30/08/2018 à 16:45, Christian Brauner a écrit :
[snip]
> Introducing the IFA_IF_NETNSID property will not make the netlink
> interface less modular. It is a clean, RTM_*ADDR-request specific
> property using network namespace identifiers which we discussed in prior
> patches are the way to go forward.
> 
> You can already get interfaces via GETLINK from another network
> namespaces than the one you reside in (Which we enabled just a few
> months back.) but you can't do the same for GETADDR. Those two are
> almost always used together. When you want to get the links you usually
> also want to get the addresses associated with it right after.
> In a prior discussion we agreed that network namespace identifiers are
> the way to go forward but that any other propery, i.e. PIDs and fds
> should never be ported into other parts of the codebase and that is
> indeed something I agree with.
Yes, I agree with this and I think this series go to the right direction.

Maybe I would choose a more generic name for the attribute, something that can
be used in other netlink families (xfrm, netfilter, ...) also.
What about IFA_TARGET_NSID?