Re: [B.A.T.M.A.N.] [PATCHv15 2/4] batman-adv: Add multicast optimization support for bridged setups

[Marek Lindner <mareklindner@neomailbox.ch>]

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On Tuesday, May 10, 2016 18:41:25 Linus Lüssing wrote:
> 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: Simon Wunderlich <sw@simonwunderlich.de>
> Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
> ---
>  compat-include/linux/etherdevice.h |    9 ++
>  compat-include/linux/if_bridge.h   |   68 ++++++++++++++
>  net/batman-adv/multicast.c         |  181
> ++++++++++++++++++++++++++++++++----
> net/batman-adv/types.h             |   13 +++
>  4 files changed, 253 insertions(+), 18 deletions(-)
>  create mode 100644 compat-include/linux/if_bridge.h

Applied in revision 391b59c.

Thanks,
Marek

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