• Linus Lüssing's avatar
    batman-adv: Add multicast optimization support for bridged setups · 687937ab
    Linus Lüssing authored
    With this patch we are finally able to support multicast optimizations
    in bridged setups, too. So far, if a bridge was added on top of a
    soft-interface (e.g. bat0) the batman-adv multicast optimizations
    needed to be disabled to avoid packetloss.
    
    Current Linux bridge implementations and API can now provide us
    with the so far missing information about interested but "remote"
    multicast receivers behind bridge ports.
    
    The Linux bridge performs the detection of remote participants
    interested in multicast packets with its own and mature so
    called IGMP and MLD snooping code and stores that in its
    database. With the new API provided by the bridge batman-adv can
    now simply hook into this database.
    
    We then reliably announce the gathered multicast listeners to
    other nodes through the batman-adv translation table.
    
    Additionally, the Linux bridge provides us with the information about
    whether an IGMP/MLD querier exists. If there is none then we need to
    disable multicast optimizations as we cannot learn about multicast
    listeners on external, bridged-in host then.
    Tested-by: default avatarSimon Wunderlich <sw@simonwunderlich.de>
    Signed-off-by: default avatarLinus Lüssing <linus.luessing@c0d3.blue>
    Signed-off-by: default avatarMarek Lindner <mareklindner@neomailbox.ch>
    Signed-off-by: default avatarSven Eckelmann <sven@narfation.org>
    Signed-off-by: default avatarSimon Wunderlich <sw@simonwunderlich.de>
    687937ab
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