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IP multicast must sometimes be discriminated from non-IP multicast, e.g. when determining the forwarding behavior of a given group in the presence of multicast router ports on an offloaded bridge. Therefore, provide helpers to identify these groups. Signed-off-by: Casper Andersson <casper.casan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>