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