Source Address Filtering

Filter-mode is either "INCLUDE" or "EXCLUDE"
INCLUDE indicates that reception of packets sent to the multicast address is requested only from the specified source addresses.
EXCLUDE indicates that reception of packets sent to the multicast address is requested from all source addresses except the specified source addresses.
Socket state
(i, m, filter-mode, source-list)
Interface state
(m, filter-mode, source-list)
Initial interface state is (null, INCLUDE, null)