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    [TUN]: Allow to register tun devices in namespace. · fc54c658
    Pavel Emelyanov 提交于
    This is basically means that a net is set for a new device, but
    actually also involves two more steps:
    
    1. mark the tun device as "local", i.e. do not allow for it to
       move across namespaces.
    
    This is done so, since tun device is most often associated to some
    file (and thus to some process) and moving the device alone is not
    valid while keeping the file and the process outside. The need in 
    ability to move a detached persistent device is to be investigated 
    later.
    
    2. get the tun device's net when tun becomes attached and put one
       when it becomes detached.
    
    This is needed to handle the case when a task owning the tun dies,
    but a files lives for some more time - in this case we must not
    allow for net to be freed, since its exit hook will spoil that file's
    private data by unregistering the tun from under tun_chr_close.
    Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
    Signed-off-by: NDavid S. Miller <davem@davemloft.net>
    fc54c658
tun.c 22.9 KB