96 lines
1.9 KiB
Elixir
96 lines
1.9 KiB
Elixir
defmodule Openflow.Action.SetField do
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@moduledoc """
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Set a header field using OXM TLV format.
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"""
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defstruct(field: nil)
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alias __MODULE__
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@type t :: %SetField{field: Keyword.t()}
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@set_field_size 8
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def ofpat, do: 25
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@doc """
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Create a new set_field action struct
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note: The following oxm(nxm)_header values are potentially acceptable as `field`:
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- :tun_id
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- :tun_ipv4_src
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- :tun_ipv4_dst
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- :tun_ipv6_src
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- :tun_ipv6_dst
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- :tun_flags
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- :tun_gbp_id
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- :tun_gbp_flags
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- :tun_metadata{0..63}
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- :in_port
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- :pkt_mark
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- :ct_mark
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- :ct_label
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- :reg{0..15}
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- :xreg{0..8}
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- :xxreg{0..4}
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- :eth_src
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- :eth_dst
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- :vlan_tci
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- :mpls_ttl
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- :ip_src
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- :ip_dst
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- :ipv6_src
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- :ipv6_dst
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- :ipv6_label
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- :ip_tos
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- :ip_ecn
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- :ip_ttl
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- :arp_op
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- :arp_spa
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- :arp_tpa
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- :arp_sha
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- :arp_tha
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- :tcp_src
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- :tcp_dst
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- :udp_src
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- :udp_dst
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- :icmp_type
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- :icmp_code
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- :icmpv6_type
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- :icmpv6_code
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- :nd_target
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- :nd_sll
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- :nd_tll
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- :metadata
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```elixir
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iex> %SetField{field: [reg1: 10]} = SetField.new(reg1: 10)
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```
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"""
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@spec new(Keyword.t()) :: t()
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def new([{_field, _value}] = oxm_field) do
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%SetField{field: oxm_field}
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end
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def to_binary(%SetField{field: field}) do
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match_bin =
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field
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|> Openflow.Match.new()
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|> Openflow.Match.to_binary()
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<<1::16, _length::16, padded_field::bytes>> = match_bin
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patial_len = @set_field_size - 4 + byte_size(padded_field)
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padding = Openflow.Utils.padding(patial_len, 8)
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length = patial_len + padding
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<<25::16, length::16, padded_field::bytes, 0::size(padding)-unit(8)>>
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end
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def read(<<25::16, _length::16, match_field_bin::bytes>>) do
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<<_class::16, _field::7, _hm::1, flen::8, _rest::bytes>> = match_field_bin
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match_len = 4 + 4 + flen
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match_bin = <<1::16, match_len::16, match_field_bin::bytes>>
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{[field | _], _rest} = Openflow.Match.read(match_bin)
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%SetField{field: [field]}
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end
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end
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