[lwip-devel] [task #12722] Improve IPv4/v6 address handling

[Simon Goldschmidt]

URL:
  <http://savannah.nongnu.org/task/?12722>

                 Summary: Improve IPv4/v6 address handling
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: goldsimon
            Submitted on: Sa 29 Jun 2013 20:11:41 GMT
                Category: IPv6
         Should Start On: Sa 29 Jun 2013 00:00:00 GMT
   Should be Finished on: Sa 29 Jun 2013 00:00:00 GMT
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
                  Effort: 0.00

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Details:

One thing I'm still not happy with in integrating IPv6 is the ipX_addr_t
implementation. As a union, it covers both IPv4 and IPv6 addresses but once
you have it detached from its pcb, you can't tell wether it is v4 or v6.

When introducing ipX_addr_t, I did that to save space, but I don't think it's
worth the effort: it's currently 16 bytes and adding 1 extra byte at the end,
it would be 17 bytes, or 20 bytes where alignment follows in structs.

Summed up, this means that we need more memory, but I think systems
implementing IPv6 don't count memory in bytes but rather KBytes, anyway, or am
I wrong?




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