buglwIP - A Lightweight TCP/IP stack - Bugs: bug #47291, lowpan6: wrong datagram size for...

 
 

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bug #47291: lowpan6: wrong datagram size for fragmentation

Submitted by:  Martine Lenders <authmillenon>
Submitted on:  Sun 28 Feb 2016 04:06:35 AM UTC  
 
Category:  IPv6 Severity:  3 - Normal
Item Group:  Faulty Behaviour Status:  Fixed
Privacy:  Public Assigned to:  Simon Goldschmidt <goldsimon>
Open/Closed:  Closed Planned Release:  None
lwIP version:  git head

Fri 09 Mar 2018 10:31:07 AM UTC, comment #2:

Should be fixed. Tested with zepif against a zepif using contiki's sicslowpan.c. Also tested with zepif using wireshark dissector.

Simon Goldschmidt <goldsimon>
Project AdministratorIn charge of this item.
Thu 03 Mar 2016 11:53:20 PM UTC, comment #1:

Yes, you are right.
We need to:
- Change the length field
- Change input processing. Currently packets are de-fragmented and then uncompressed, we probably need to uncompress the first fragment when it arrives, and then append the following fragments.

Ivan Delamer <idelamer>
Project Member
Sun 28 Feb 2016 04:06:35 AM UTC, original submission:

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.

Martine Lenders <authmillenon>

 

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    Follow 5 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2018-03-09 goldsimon StatusConfirmed => Fixed
        Assigned toNone => goldsimon
        Open/ClosedOpen => Closed
    2016-03-03 idelamer StatusNone => Confirmed
    2016-02-28 authmillenon Carbon-Copy- => Added -email is unavailable-

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