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

[David Miller]

From: Christian Brauner <christian.brauner@xxxxxxxxxx>
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@xxxxxxxxxx>

Applied.