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´IGMP proxy: fix fast leave bug when multiple LAN ports joined one group

Reidar Cederqvist - Genexis requested to merge igmp-fix-fast-leave into release-4.3

The patch includes the following changes related to mcproxy:

  • In fast leave mode, leave a multicast group on upstream only when all LAN ports have left the group. The member ports checking is via parsing bridge MDB.

  • Removed the specific query during fast leave, which is a known error in the first commit for fast leave.

  • In fast leave mode, the fast leave flag in kernel bridge driver is set on all member interfaces of bridge br-lan.

  • Disabled the IGMP general query on br-lan in kernel bridge driver, because it is taken by mcproxy.

@sukrus It turned out it was supposed to be a patch because we use the package repo from the package owner on github.

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