51 lines
2 KiB
Elixir
51 lines
2 KiB
Elixir
defmodule Openflow.Action.NxOutputReg2 do
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import Bitwise
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defstruct(
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n_bits: 0,
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offset: 0,
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src_field: nil,
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max_len: :no_buffer
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)
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@experimenter 0x00002320
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@nxast 32
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alias __MODULE__
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def new(options) do
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src_field = Keyword.get(options, :src_field)
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default_n_bits = Openflow.Match.Field.n_bits_of(src_field)
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n_bits = Keyword.get(options, :n_bits, default_n_bits)
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ofs = Keyword.get(options, :offset, 0)
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max_len = Keyword.get(options, :max_len, :no_buffer)
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%NxOutputReg2{n_bits: n_bits, offset: ofs, src_field: src_field, max_len: max_len}
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end
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def to_binary(%NxOutputReg2{n_bits: n_bits, offset: ofs, src_field: src_field, max_len: max_len}) do
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src_field_bin = Openflow.Match.codec_header(src_field)
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ofs_nbits = (ofs <<< 6) ||| (n_bits - 1)
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max_len = Openflow.Utils.get_enum(max_len, :controller_max_len)
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padding = Openflow.Utils.padding(byte_size(src_field_bin), 10)
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body = <<ofs_nbits::16, max_len::16, src_field_bin::bytes, 0::size(padding)-unit(8)>>
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exp_body = <<@experimenter::32, @nxast::16, body::bytes>>
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exp_body_size = byte_size(exp_body)
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padding_length = Openflow.Utils.padding(4 + exp_body_size, 8)
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length = 4 + exp_body_size + padding_length
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<<0xffff::16, length::16, exp_body::bytes, 0::size(padding_length)-unit(8)>>
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end
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def read(<<@experimenter::32, @nxast::16, body::bytes>>) do
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<<ofs::10, n_bits::6, max_len::16, oxm_header::4-bytes, rest::bitstring>> = body
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exp_size = match_header_size(oxm_header) - 4
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<<experimenter_int::size(exp_size)-unit(8), _padding::bytes>> = rest
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src_field = Openflow.Match.codec_header(<<oxm_header::bytes, experimenter_int::size(exp_size)-unit(8)>>)
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max_len = Openflow.Utils.get_enum(max_len, :controller_max_len)
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%NxOutputReg2{n_bits: n_bits + 1, offset: ofs, src_field: src_field, max_len: max_len}
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end
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# private functions
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defp match_header_size(<<0xffff::16, _::bytes>>), do: 8
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defp match_header_size(<<_::16, _::bytes>>), do: 4
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end
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