[lwip-devel] [bug #44399] receiving TCP Ack packet with Window Update

[ran]

URL:
  <http://savannah.nongnu.org/bugs/?44399>

                 Summary: receiving TCP Ack packet with Window Update
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: rang
            Submitted on: Sun 01 Mar 2015 02:55:57 PM GMT
                Category: TCP
                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:

hi
We have been playing a bit with the liwp library and might have found a bug.
When receiving an Ack TCP packet with the same seq and ack number as the
packet before but with a different window (wireshark identifies it as an
Update Window Packet).
In LWIP in tcp_in.c:tcp_receive we see that the code (head branch) checks if
the seq and ack are identical to the last received packet. If not (that is our
case) then there is only a print and the window size is not updated.
We believe that this might be a bug.
Thanks
Ran




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