connection-manager: updated the spec

docs/network-spec/connection-manager.tex

@@ -126,6 +126,7 @@ \chapter{Connection Manager State Machine Specification}
 \def\CommitUniLoc{\textsf{Commit}\textsuperscript{\textsf{Unidirectional}}\textsubscript{\textsf{Local}}}
 \def\Terminate{\textsf{Terminate}}
 \def\Timeout{\textsf{Timeout}}
+\def\SelfConn{\textsf{SelfConn}}
 
 % Inbound governor states
 \def\RemoteEstablished{\textsf{RemoteEstablished}}
@@ -649,9 +650,11 @@ \subsection{Connection states}\label{sec:connection-state}
     \draw[->]         (OutboundStateUni.190)    to [out=270, in=90,pos=0.23,looseness=2]
                                                 node[fill=white,rotate=88,pos=0.3]{\small\DemotedToColdUniLoc}        (OutboundIdleStateUni.173);
 
-    \draw[->]         (OutboundIdleStateUni)       to [out=300, in=180] node[fill=white,below left]{\CommitUniLoc}         (TerminatingState.180);
+    \draw[->]         (OutboundIdleStateUni)       to [out=300, in=180] node[fill=white,below left]{\CommitUniLoc}    (TerminatingState.180);
     \draw[->]         (OutboundIdleStateDup.280)   -- node[fill=white,pos=.4]{\CommitDupLoc}                          (TerminatingState.40);
     \draw[->]         (TerminatingState)           -- node[left]{\Terminate}                                          (TerminatedState);
+
+    \draw[->]         (UnnegotiatedStateOut)     -- node[above]{\small\SelfConn}                                      (UnnegotiatedStateIn);
   \end{tikzpicture}}
   \caption{\textit{Outbound} (blue \& violet) and \textit{inbound} (green \&
   violet) connection states and allowed transitions.}
@@ -770,6 +773,15 @@ \subsubsection{\Accepted{} and \Overwritten{}}
 time, in which case it would re-use the accepted connection (assuming that
 a duplex connection was negotiated).
 
+\subsubsection{\SelfConn{}}
+
+We allow to transition from \UnnegotiatedStateOut{} to \UnnegotiatedStateIn{}.
+This can only be done when the connection manager was requested to connect to
+its own socket.  There is no way to detect these kind of misconfigurations.
+This transition is not guaranteed as on some systems in such case the outbound
+and inbound addresses (as returned by the \texttt{accept} call) can be
+different.
+
 \subsubsection{\NegotiatedUniOut{} and \NegotiatedDupOut{}}
 Once an outbound connection has been negotiated one of \NegotiatedUniOut{} or
 \NegotiatedDupOut{} transition is performed, depending on the result of handshake
@@ -1626,6 +1638,8 @@ \subsubsection{Connection manager methods}
     \draw[->, unregisterOutboundArr]         (OutboundIdleStateDup.280)   -- node[fill=white,pos=.4]{\CommitDupLoc}                          (TerminatingState.40);
     \draw[->]         (TerminatingState)           -- node[left]{\Terminate}                                          (TerminatedState);
 
+    \draw[->, registerInboundArr]            (UnnegotiatedStateOut)    -- node[above]{\small\SelfConn}                                       (UnnegotiatedStateIn);
+
   \end{tikzpicture}
   \caption{Transitions classified by connection manager method.}
   \label{fig:methods}