netdev - Re: [PATCH net-next 1/1] rtnetlink: enable IFLA_IF_NETNSID for RTM

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Date:   Wed, 31 Jan 2018 10:30:44 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     christian.brauner@...ntu.com
Cc:     netdev@...r.kernel.org, ebiederm@...ssion.com, dsahern@...il.com,
        fw@...len.de, daniel@...earbox.net, lucien.xin@...il.com,
        mschiffer@...verse-factory.net, jakub.kicinski@...ronome.com,
        vyasevich@...il.com, linux-kernel@...r.kernel.org,
        jbenc@...hat.com, w.bumiller@...xmox.com, nicolas.dichtel@...nd.com
Subject: Re: [PATCH net-next 1/1] rtnetlink: enable IFLA_IF_NETNSID for
 RTM_NEWLINK

From: Christian Brauner <christian.brauner@...ntu.com>
Date: Mon, 29 Jan 2018 18:07:20 +0100

> - Backwards Compatibility:
>   If userspace wants to determine whether RTM_NEWLINK supports the
>   IFLA_IF_NETNSID property they should first send an RTM_GETLINK request
>   with IFLA_IF_NETNSID on lo. If either EACCESS is returned or the reply
>   does not include IFLA_IF_NETNSID userspace should assume that
>   IFLA_IF_NETNSID is not supported on this kernel.
>   If the reply does contain an IFLA_IF_NETNSID property userspace
>   can send an RTM_NEWLINK with a IFLA_IF_NETNSID property. If they receive
>   EOPNOTSUPP then the kernel does not support the IFLA_IF_NETNSID property
>   with RTM_NEWLINK. Userpace should then fallback to other means.
> 
> - Security:
>   Callers must have CAP_NET_ADMIN in the owning user namespace of the
>   target network namespace.
> 
> Signed-off-by: Christian Brauner <christian.brauner@...ntu.com>

Applied.