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There are two scenarios that we will restore deleted records. The first is
when device down and up(or unmap/remap). In this scenario the new filter
mode is same with previous one. Because we get it from in_dev->mc_list and
we do not touch it during device down and up.
The other scenario is when a new socket join a group which was just delete
and not finish sending status reports. In this scenario, we should use the
current filter mode instead of restore old one. Here are 4 cases in total.
old_socket new_socket before_fix after_fix
IN(A) IN(A) ALLOW(A) ALLOW(A)
IN(A) EX( ) TO_IN( ) TO_EX( )
EX( ) IN(A) TO_EX( ) ALLOW(A)
EX( ) EX( ) TO_EX( ) TO_EX( )
Fixes: 24803f38a5c0b (igmp: do not remove igmp souce list info when set link down)
Fixes: 1666d49e1d416 (mld: do not remove mld souce list info when set link down)
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
08d3ffcc0c