Multicast support in libnl

[Thomas Graf]

On Thu, Dec 03, 2009 at 10:56:58AM +0000, Mallika Gautam wrote:
> Hi,
> 
> This is a very basic question.
> 
> I am trying to use generic netlink linux kernel 2.6.23. Briefly, the
> kernel module sends a multicast message which should then be received
> in user space. There are multiple user space processes that are
> interested in this multicast message.
> I can see the multicast macros (CTRL_ATTR_MCAST_GRP_NAME,
> CTRL_ATTR_MCAST_GRP_ID) defined in genetlink.h but no handling in
> libnl 1.1. I also checked the HEAD version in libnl git, but could not
> find any handling there as well.
> 
> Could anyone please point me how to register to a multicast group for
> generic netlink family. Also kindly point to the correct libnl version
> supporting the functionality and the site.

The code to do this has not been written yet. You may subscribe to a
generic netlink multicast group by constructing the corresponding
subscription message yourself or even better, come up with a patch to
add the relevant interfaces.