tcp: fix cleanup of non established connections (VPP-1463)

- fix delete of connection in syn-received
- fix delete of half-open connection

Change-Id: I72ff4b60406a2762d998328c52f41adea40d2c1b
Signed-off-by: Florin Coras <fcoras@cisco.com>

src/vnet/session/session.c

@@ -820,6 +820,7 @@ stream_session_delete_notify (transport_connection_t * tc)
       session_lookup_del_session (s);
       break;
     case SESSION_STATE_CLOSED:
+    case SESSION_STATE_ACCEPTING:
       stream_session_delete (s);
       break;
     }

src/vnet/tcp/tcp.c

@@ -210,7 +210,8 @@ tcp_connection_cleanup (tcp_connection_t * tc)
       /* Try to remove the half-open connection. If this is not the owning
        * thread, tc won't be removed. Retransmit or establish timers will
        * eventually expire and call again cleanup on the right thread. */
-      tcp_half_open_connection_cleanup (tc);
+      if (tcp_half_open_connection_cleanup (tc))
+	tc->flags |= TCP_CONN_HALF_OPEN_DONE;
     }
   else
     {
@@ -322,8 +323,10 @@ tcp_connection_close (tcp_connection_t * tc)
       tc->state = TCP_STATE_CLOSED;
       break;
     case TCP_STATE_SYN_RCVD:
+      tcp_connection_timers_reset (tc);
       tcp_send_fin (tc);
       tc->state = TCP_STATE_FIN_WAIT_1;
+      tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
       break;
     case TCP_STATE_ESTABLISHED:
       if (!session_tx_fifo_max_dequeue (&tc->connection))