netns: notify netns id events
With this patch, netns ids that are created and deleted are advertised into the group RTNLGRP_NSID. Because callers of rtnl_net_notifyid() already know the id of the peer, there is no need to call __peernet2id() in rtnl_net_fill(). Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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