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    SubjectRe: [PATCH net-next] bridge: multicast to unicast
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    On Mon, 2017-01-09 at 12:44 +0100, M. Braun wrote:
    > Am 09.01.2017 um 09:08 schrieb Johannes Berg:
    > > Does it make sense to implement the two in separate layers though?
    > >
    > > Clearly, this part needs to be implemented in the bridge layer due
    > > to
    > > the snooping knowledge, but the code is very similar to what
    > > mac80211
    > > has now.
    >
    > Does the bridge always know about all stations connected?
    >
    > That is bridge fdb entries (need to) expire so the bridge might
    > "forget" a still-connected station not sending but only consuming
    > broadcast traffic.
    >
    > E.g. there is a television broadcast station here that receives a
    > video stream (via wifi, udp packets) and then airs it (dvb-t) but (on
    > its own) would not send any data packet on wifi (static ip, etc.).

    Ok, that I don't know. Somehow if you address a unicast packet there
    the bridge has to make a decision - so it really should know? Would it
    query the port somehow to see if the device is behind it, if getting a
    packet for a station it forgot about?

    > An other reason to implement this in mac80211 initially was that
    > mac80211 could encapsulate broacast/multicast ethernet packtes in
    > unicast A-MSDU packets in a way, so that the receiver would still see
    > process ethernet packets (after conversion) but have unicast wifi
    > frames. This cannot be done in bridge easily but one might want to
    > add this later to mac80211.

    Yes, DMG would have to be done in mac80211, but that's a lot clearer
    case too since it requires negotiation functionality etc.

    johannes

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