Re: RFC: Network namespaces in NM

On Thu, 2016-02-04 at 12:21 +0100, Stjepan Groš wrote:

Is anyone working on network namespaces support in NetworkManager? Or
was thinking what is a "proper way" of implementing them?

I'm experimenting with adding support to NM and what I implemented so
far is:

1. Added objects NMNetnsController which would control all network
namespaces managed by NM.

2. Each network namespace is represented with an object NMNetns and
exposed on DBus. There are no methods so far but only a property name
which contains network namespace's name on the filesystem.

3. NMNetnsController exposes object NetworkNamespacesController with
methods AddNetworkNamepace and ListNetworkNamespaces. The first one
take a name as an argument and creates a new (iproute2 compatible)
network namespace, while the second one provides a list of existing

4. When new network namespace is created (using  AddNetworkNamepace
method) a new, private, platform layer is instantiated and loopback
interface within namespace activated. Note that new platform layer
has to be created because once a socket is opened in one network
namespace it is bound to the given namespace no matter which
namespace is active so current singleton object wouldn't work without
heavy refactoring!

What I intend to do next is:

1. NM has to monitor devices/IP addresses in new network namespaces

2. Methods that would allow an IPv4 or IPv6 address to be assigned in
some network namespace.

All the code is here:

and since this is PoC, there are A LOT OF BUGS AND MISSING FEATURES.

So, what do you think? Any comments, suggestions, critiques, etc?


P.S. To be able to run patched NM you also need patched libndp
library available here:

Hi Sjepan,

I think adding namespace support to platform needs to be more
elaborate. There is also udev, ethtool, sysctl, which must be
considered and the NMPlatform instance must transparently switch
namespace as needed.

I did that here:


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