mpbl3p_udp = Proto("mpbl3p_udp", "Multi Path Proxy Custom UDP")

ack_F = ProtoField.uint32("mpbl3p_udp.ack", "Acknowledgement")
nack_F = ProtoField.uint32("mpbl3p_udp.nack", "Negative Acknowledgement")
seq_F = ProtoField.uint32("mpbl3p_udp.seq", "Sequence Number")
time_F = ProtoField.absolute_time("mpbl3p_udp.time", "Timestamp")
proxied_F = ProtoField.bytes("mpbl3p_udp.data", "Proxied Data")

mpbl3p_udp.fields = { ack_F, nack_F, seq_F, time_F, proxied_F }

function mpbl3p_udp.dissector(buffer, pinfo, tree)
    if buffer:len() < 20 then
        return
    end

    pinfo.cols.protocol = "MPBL3P_UDP"

    local ack = buffer(0, 4):le_uint()
    local nack = buffer(4, 4):le_uint()
    local seq = buffer(8, 4):le_uint()

    local unix_time = buffer(buffer:len() - 8, 8):le_uint64()

    local subtree = tree:add(mpbl3p_udp, buffer(), "Multi Path Proxy Header, SEQ: " .. seq .. " ACK: " .. ack .. " NACK: " .. nack)

    subtree:add(ack_F, ack)
    subtree:add(nack_F, nack)
    subtree:add(seq_F, seq)
    subtree:add(time_F, NSTime.new(unix_time:tonumber()))
    if buffer:len() > 20 then
        subtree:add(proxied_F, buffer(12, buffer:len() - 12 - 8))
    end
end

DissectorTable.get("udp.port"):add(4724, mpbl3p_udp)
DissectorTable.get("udp.port"):add(4725, mpbl3p_udp)