79 lines
2.2 KiB
Elixir
79 lines
2.2 KiB
Elixir
defmodule Openflow.Action.NxOutputReg2 do
|
|
import Bitwise
|
|
|
|
defstruct(
|
|
n_bits: 0,
|
|
offset: 0,
|
|
src_field: nil,
|
|
max_len: :no_buffer
|
|
)
|
|
|
|
@experimenter 0x00002320
|
|
@nxast 32
|
|
|
|
alias __MODULE__
|
|
alias Openflow.Action.Experimenter
|
|
|
|
@type max_len :: :no_buffer | :max | non_neg_integer()
|
|
@type t :: %NxOutputReg2{
|
|
n_bits: pos_integer(),
|
|
offset: non_neg_integer(),
|
|
src_field: atom(),
|
|
max_len: max_len()
|
|
}
|
|
|
|
@spec new(
|
|
n_bits: pos_integer(),
|
|
offset: non_neg_integer(),
|
|
src_field: atom(),
|
|
max_len: max_len()
|
|
) :: t()
|
|
def new(options) do
|
|
src_field = options[:src_field] || raise "src_field must be specified"
|
|
default_n_bits = Openflow.Match.n_bits_of(src_field)
|
|
|
|
%NxOutputReg2{
|
|
n_bits: options[:n_bits] || default_n_bits,
|
|
offset: options[:offset] || 0,
|
|
src_field: src_field,
|
|
max_len: options[:max_len] || :no_buffer
|
|
}
|
|
end
|
|
|
|
def to_binary(%NxOutputReg2{} = output_reg) do
|
|
src_field_bin = Openflow.Match.codec_header(output_reg.src_field)
|
|
ofs_nbits = output_reg.offset <<< 6 ||| output_reg.n_bits - 1
|
|
max_len = Openflow.Utils.get_enum(output_reg.max_len, :controller_max_len)
|
|
|
|
padding =
|
|
src_field_bin
|
|
|> byte_size()
|
|
|> Openflow.Utils.padding(10)
|
|
|
|
Experimenter.pack_exp_header(<<
|
|
@experimenter::32,
|
|
@nxast::16,
|
|
ofs_nbits::16,
|
|
max_len::16,
|
|
src_field_bin::bytes,
|
|
0::size(padding)-unit(8)
|
|
>>)
|
|
end
|
|
|
|
def read(<<@experimenter::32, @nxast::16, body::bytes>>) do
|
|
<<ofs::10, n_bits::6, max_len::16, oxm_header::4-bytes, rest::bitstring>> = body
|
|
exp_size = match_header_size(oxm_header) - 4
|
|
<<experimenter_int::size(exp_size)-unit(8), _padding::bytes>> = rest
|
|
|
|
src_field =
|
|
Openflow.Match.codec_header(<<oxm_header::bytes, experimenter_int::size(exp_size)-unit(8)>>)
|
|
|
|
max_len = Openflow.Utils.get_enum(max_len, :controller_max_len)
|
|
%NxOutputReg2{n_bits: n_bits + 1, offset: ofs, src_field: src_field, max_len: max_len}
|
|
end
|
|
|
|
# private functions
|
|
|
|
defp match_header_size(<<0xFFFF::16, _::bytes>>), do: 8
|
|
defp match_header_size(<<_::16, _::bytes>>), do: 4
|
|
end
|