Openflow parser

lib/openflow/actions/nx_flow_spec_output.ex

@@ -0,0 +1,38 @@
+defmodule Openflow.Action.NxFlowSpecOutput do
+  defstruct(
+    n_bits: 0,
+    src: nil,
+    src_offset: 0
+  )
+
+  @learn_src_field     0
+  @learn_dst           2
+
+  alias __MODULE__
+
+  def new(options) do
+    src = Keyword.get(options, :src)
+    src_ofs = Keyword.get(options, :src_offset, 0)
+    default_n_bits = Openflow.Match.Field.n_bits_of(src)
+    n_bits = Keyword.get(options, :n_bits, default_n_bits)
+    %NxFlowSpecOutput{n_bits: n_bits,
+                      src: src,
+                      src_offset: src_ofs}
+  end
+
+  def to_binary(%NxFlowSpecOutput{n_bits: n_bits,
+                                  src: src,
+                                  src_offset: src_ofs}) do
+    src_bin = Openflow.Match.codec_header(src)
+    <<0::2, @learn_src_field::1, @learn_dst::2, n_bits::11, src_bin::4-bytes, src_ofs::16>>
+  end
+
+  def read(<<0::2, @learn_src_field::1, @learn_dst::2,
+             n_bits::11, src_bin::4-bytes, src_ofs::16, rest::bitstring>>) do
+    src = Openflow.Match.codec_header(src_bin)
+    flow_spec = %NxFlowSpecOutput{n_bits: n_bits,
+                                  src: src,
+                                  src_offset: src_ofs}
+    {flow_spec, rest}
+  end
+end