Hi all, This addresses comments so far except Eric's suggestion to use InetSocketAddressBase. If I understand correctly its intended use, it will not be of help for protocols which have no port (raw sockets - GRE, L2TPv3, etc).
It also includes a port of the original socket.c transport to the new UDST backend. The relevant code is ifdef-ed so there should be no effect on other systems. I think that this is would be the appropriate place to stop in this iteration. I would prefer to have this polished, before I start looking at sendmmsg and bulk send or some of the more unpleasant encapsulations like geneve. A.
