45 lines
1.6 KiB
Elixir
45 lines
1.6 KiB
Elixir
defmodule Openflow.Action.NxRegLoad 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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dst_field: nil,
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value: nil
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)
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@experimenter 0x00002320
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@nxast 7
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alias __MODULE__
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def new(options) do
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dst_field = Keyword.get(options, :dst_field)
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default_n_bits = Openflow.Match.Field.n_bits_of(dst_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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value = Keyword.get(options, :value)
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%NxRegLoad{n_bits: n_bits, offset: ofs, dst_field: dst_field, value: value}
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end
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def to_binary(%NxRegLoad{n_bits: n_bits, offset: ofs, dst_field: dst_field, value: value}) do
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dst_field_bin = Openflow.Match.codec_header(dst_field)
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value_bin0 = Openflow.Match.Field.codec(value, dst_field)
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tmp_value = :binary.decode_unsigned(value_bin0, :big)
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value_bin = <<tmp_value::64>>
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ofs_nbits = ofs <<< 6 ||| n_bits - 1
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body = <<ofs_nbits::16, dst_field_bin::4-bytes, value_bin::bytes>>
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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, dst_field_bin::4-bytes, value_bin::bytes>> = body
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dst_field = Openflow.Match.codec_header(dst_field_bin)
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value = Openflow.Match.Field.codec(value_bin, dst_field)
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%NxRegLoad{n_bits: n_bits + 1, offset: ofs, dst_field: dst_field, value: value}
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end
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end
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