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33f72e6f0c
Previously l2tp module did not provide any means for the user space to get notified when tunnels/sessions are added/modified/deleted. This change contains the following - create a multicast group for the listeners to register. - notify the registered listeners when the tunnels/sessions are created/modified/deleted. Signed-off-by: Bill Hong <bhong@brocade.com> Reviewed-by: Stephen Hemminger <stephen@networkplumber.org> Reviewed-by: Sven-Thorsten Dietrich <sven@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>