Add CopyTtlInwards action

Rakefile

@@ -1,7 +1,7 @@
 require 'bundler/gem_tasks'
 
 RELISH_PROJECT = 'trema/pio'
-FLAY_THRESHOLD = 1450
+FLAY_THRESHOLD = 1470
 
 task default: :travis
 task test: [:spec, :cucumber]

features/open_flow13/copy_ttl_inwards.feature

@@ -0,0 +1,14 @@
+@open_flow13
+Feature: Pio::CopyTtlInwards
+
+  Copies TTL "inwards" -- from outermost to next-to-outermost
+
+  Scenario: new
+    When I try to create an OpenFlow action with:
+      """
+      Pio::CopyTtlInwards.new
+      """
+    Then it should finish successfully
+    And the action has the following fields and values:
+      | field       | value |
+      | action_type |    12 |

lib/pio/open_flow.rb

@@ -24,7 +24,7 @@ def self.switch_version(version)
        :SetArpSenderHardwareAddress, :NiciraRegMove, :SetMetadata,
        :NiciraRegLoad, :NiciraSendOutPort, :NiciraStackPush,
        :NiciraStackPop, :DecrementIpTtl, :SetIpTtl,
-       :CopyTtlOutwards].each do |each|
+       :CopyTtlOutwards, :CopyTtlInwards].each do |each|
         set_message_class_name each, version
         @version = version.to_s
       end

lib/pio/open_flow13.rb

@@ -15,6 +15,7 @@
 # Actions
 require 'pio/open_flow/nicira_resubmit'
 require 'pio/open_flow/nicira_resubmit_table'
+require 'pio/open_flow13/copy_ttl_inwards'
 require 'pio/open_flow13/copy_ttl_outwards'
 require 'pio/open_flow13/decrement_ip_ttl'
 require 'pio/open_flow13/nicira_reg_load'

lib/pio/open_flow13/copy_ttl_inwards.rb

@@ -0,0 +1,15 @@
+require 'pio/open_flow/action'
+
+module Pio
+  module OpenFlow13
+    # Copies TTL "inwards" -- from outermost to next-to-outermost
+    class CopyTtlInwards < OpenFlow::Action
+      action_header action_type: 12, action_length: 8
+      string :padding, length: 4
+
+      def initialize
+        super({})
+      end
+    end
+  end
+end