[DGD] API requirements for networking extensions

[Raymond Jennings]

Just to be clear, I was talking about getting the remote port from *any*
connection, both ones created via connect() and ones received locally,
either by the driver from a port opened by configuration, or by a port
object that was opened.

Basically, given the need for code unification, the solution I was hoping
for would be one that would be able to treat all connections the same way
no matter how they were established (whether outbound via connect(), or
inbound via the driver object or a port object).

I think a query_ip_port(object conn) kfun would be a neat and tidy way to
get this information.

To a lesser extent I also think that this information would be useful even
in vanilla dgd for the same reasons even if the network extensions were NOT
enabled.

Felix, bart, what do you think?