igmp: add __ip_mc_{join|leave}_group()
There is a need to perform igmp join/leave operations while RTNL is held. Make ip_mc_{join|leave}_group() wrappers around __ip_mc_{join|leave}_group() to avoid the proliferation of work queues. For example, vxlan_igmp_join() could possibly be removed. Signed-off-by: NEric Dumazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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