[lwip-devel] [bug #47291] lowpan6: wrong datagram size for fragmentation

[Martine Lenders]

URL:
  <http://savannah.nongnu.org/bugs/?47291>

                 Summary: lowpan6: wrong datagram size for fragmentation
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: authmillenon
            Submitted on: Sun 28 Feb 2016 04:06:35 AM GMT
                Category: IPv6
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: git head

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Details:

RFC 6282 states in <a
href="https://tools.ietf.org/html/rfc6282#section-2";>section 2</a>:

<pre>
   [RFC4944] defines the fragment header's datagram_size and
   datagram_offset values as the size and offset of the IPv6 datagram
   before compression.  As a result, all fragment payload outside the
   first fragment must carry their respective portions of the IPv6
   datagram before compression.  This document does not change that
   requirement.
</pre>

The newly introduced lowpan6.c however uses the datagram_size and
datagram_offset <i>after</i> compression.




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