[lwip-devel] [task #12154] UDP Listen on both IPv4 and IPv6 when bound to IPADDR_ANY

[Ivan Delamer]

URL:
  <http://savannah.nongnu.org/task/?12154>

                 Summary: UDP Listen on both IPv4 and IPv6 when bound to
IPADDR_ANY
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: idelamer
            Submitted on: Tue 03 Jul 2012 02:37:57 PM MDT
                Category: UDP
         Should Start On: Tue 03 Jul 2012 12:00:00 AM MDT
   Should be Finished on: Wed 03 Jul 2013 12:00:00 AM MDT
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: idelamer
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
                  Effort: 0.00

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Details:

TCP sockets bound to IP6ADDR_ANY allow listening for incoming connections on
either IPv6 or IPv4.

UDP sockets require two PCBs to listen on both IP versions.

UDP is trickier than TCP because, once established, the PCB is set to v4 or v6
and all in/out packets share the same version. UDP would require some
additional handling of default PCB version and current packet version.




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