83 lines
2.8 KiB
Elixir
83 lines
2.8 KiB
Elixir
defmodule Openflow.Action.NxFlowSpecMatch do
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defstruct(
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src: nil,
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dst: nil,
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n_bits: 0,
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src_offset: 0,
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dst_offset: 0
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)
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@learn_src_field 0
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@learn_src_immediate 1
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@learn_dst 0
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alias __MODULE__
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def new(options) do
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src = Keyword.get(options, :src)
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dst = Keyword.get(options, :dst)
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default_n_bits = Openflow.Match.Field.n_bits_of(dst)
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n_bits = Keyword.get(options, :n_bits, default_n_bits)
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src_ofs = Keyword.get(options, :src_offset, 0)
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dst_ofs = Keyword.get(options, :dst_offset, 0)
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%NxFlowSpecMatch{src: src,
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dst: dst,
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n_bits: n_bits,
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src_offset: src_ofs,
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dst_offset: dst_ofs}
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end
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def to_binary(%NxFlowSpecMatch{} = fsm) do
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%NxFlowSpecMatch{
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dst: dst_field,
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n_bits: n_bits,
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src_offset: src_ofs,
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dst_offset: dst_ofs
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} = fsm
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{src_code, src_bin} = codec_src(fsm)
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dst_bin = Openflow.Match.codec_header(dst_field)
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case src_code do
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@learn_src_immediate ->
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<<0::2, src_code::1, @learn_dst::2, n_bits::11,
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src_bin::bytes, dst_bin::4-bytes, dst_ofs::16>>
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@learn_src_field ->
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<<0::2, src_code::1, @learn_dst::2, n_bits::11,
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src_bin::bytes, src_ofs::16, dst_bin::4-bytes, dst_ofs::16>>
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end
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end
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def read(<<_::2, @learn_src_field::1, @learn_dst::2, n_bits::11, src_bin::4-bytes,
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src_ofs::16, dst_bin::4-bytes, dst_ofs::16, rest::bitstring>>) do
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src = Openflow.Match.codec_header(src_bin)
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dst = Openflow.Match.codec_header(dst_bin)
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flow_spec = %NxFlowSpecMatch{src: src,
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dst: dst,
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n_bits: n_bits,
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src_offset: src_ofs,
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dst_offset: dst_ofs}
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{flow_spec, rest}
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end
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def read(<<_::2, @learn_src_immediate::1, @learn_dst::2, n_bits::11, binary::bitstring>>) do
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rounded_up_len = Openflow.Utils.pad_length(n_bits, 8)
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rounded_up_nbits = n_bits + rounded_up_len
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<<src_bin::size(rounded_up_nbits)-bits, dst_bin::4-bytes, dst_ofs::16, rest::bitstring>> = binary
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dst = Openflow.Match.codec_header(dst_bin)
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src = Openflow.Match.Field.codec(src_bin, dst)
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flow_spec = %NxFlowSpecMatch{src: src,
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dst: dst,
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n_bits: n_bits,
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dst_offset: dst_ofs}
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{flow_spec, rest}
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end
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# private functions
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defp codec_src(%NxFlowSpecMatch{src: src_field}) when is_atom(src_field) do
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src_bin = Openflow.Match.codec_header(src_field)
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{@learn_src_field, src_bin}
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end
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defp codec_src(%NxFlowSpecMatch{src: src, dst: dst_field}) do
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src_bin = Openflow.Match.Field.codec(src, dst_field)
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{@learn_src_immediate, src_bin}
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end
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end
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