[lwip-devel] [bug #50739] 6lowpan - IPHC de-compression bug

[Aigner B.]

URL:
  <http://savannah.nongnu.org/bugs/?50739>

                 Summary: 6lowpan - IPHC de-compression bug
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: aignerb
            Submitted on: Thu 06 Apr 2017 12:34:52 PM UTC
                Category: IPv6
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 2.0.2

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Details:

Hi @all,

I'm working on a RFC7668 implementation on the ESP32 (6lowpan over Bluetooth
LE).

I found a wrong implementation within the header decompression:

lowpan6.c:841

ip6hdr->dest.addr[0] = htonl(0xff000000UL |
lowpan6_buffer[lowpan6_offset++]);

This line is the dest. address decompression for the settings Multicast=1,
DAC=1, DAM=10.
According to RFC6282, page 9, following address format is used:

10:  32 bits.  The address takes the form ffXX::00XX:XXXX.

So, as I think, the line should be written as following:

ip6hdr->dest.addr[0] = htonl(0xff000000UL |
(lowpan6_buffer[lowpan6_offset++]<<16));


Am I right?

Best wishes




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