Feature/bundle support (#15)

* openflow: Add bundle support

* openflow: Add bundle message generator and parser

* openflow: Add bundle API

lib/openflow/onf_bundle_control.ex

@@ -0,0 +1,44 @@
+defmodule Openflow.OnfBundleControl do
+  defstruct(
+    version: 4,
+    xid: 0,
+    datapath_id: "",
+    aux_id: 0,
+    # bundle header
+    bundle_id: 0,
+    type: :open_request,
+    flags: []
+  )
+
+  alias __MODULE__
+
+  # ONF Experimenter
+  @experimenter 0x4F4E4600
+  # BUNDLE_CONTROL
+  @onf_type 2300
+
+  # experimenter
+  def ofp_type, do: 4
+
+  def new(options \\ []) do
+    %OnfBundleControl{
+      xid: options[:xid] || 0,
+      bundle_id: options[:bundle_id] || 0,
+      type: options[:type] || :open_request,
+      flags: options[:flags] || []
+    }
+  end
+
+  def to_binary(%OnfBundleControl{} = ctrl) do
+    bundle_id = ctrl.bundle_id
+    type_int = Openflow.Utils.get_enum(ctrl.type, :bundle_ctrl_type)
+    flags_int = Openflow.Enums.flags_to_int(ctrl.flags, :bundle_flags)
+    <<@experimenter::32, @onf_type::32, bundle_id::32, type_int::16, flags_int::16>>
+  end
+
+  def read(<<@experimenter::32, @onf_type::32, bundle_id::32, type_int::16, flags_int::16>>) do
+    type = Openflow.Utils.get_enum(type_int, :bundle_ctrl_type)
+    flags = Openflow.Enums.int_to_flags(flags_int, :bundle_flags)
+    %OnfBundleControl{bundle_id: bundle_id, type: type, flags: flags}
+  end
+end