[controller] insert 6->4 session

doc/plan.org

@@ -1432,7 +1432,6 @@ Please make sure that it is installed and available in your $PATH:
        steps
      - Longer than /96: suffix support
 
-
 ** Motivation
    TBD
 ** Translation mechanisms
@@ -1856,10 +1855,23 @@ libnanomsg-dev libjudy-dev
 ***** TODO Case IPv4 initiator
       - Needs upper level protol
 **** TODO General network matching
-***** TODO Create table
-***** TODO Fill it up from the controller
-**** TODO tcp session
+***** DONE Create table(s)
+***** DONE Fill it up from the controller: general network
+***** TODO Create controller session handler
+****** Controller Logic
+       - controller selects "outgoing" IPv4 address range => base for sessions
+       - IPv4 addresses can be "random" (in our test case), but need
+         to be unique
+       - switch does not need to know about the "range", only about
+         sessions
+       - on session create, controller selects "random" ip (ring?)
+       - on session create, controller selects "random port" (next in range?)
+       - on session create controller adds choice into 2 tables:
+         incoming, outgoing
 
+***** DONE Feed back to controller: implemented in switch
+***** TODO Create session in the controller
+**** TODO tcp session
 **** TODO udp session
 **** TODO tcp session
 ** TODO Comparison with existing tools (Performance, Features)