buglwIP - A Lightweight TCP/IP stack - Bugs: bug #36210, lwIP does not elicit an empty ACK...

 
 

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bug #36210: lwIP does not elicit an empty ACK when received unacceptable ACK

Submitter:  Woody Wu <narke>
Submitted:  Mon 16 Apr 2012 03:45:07 PM UTC
   
 
Category:  TCP Severity:  3 - Normal
Item Group:  Faulty Behaviour Status:  Fixed
Privacy:  Public Assigned to:  goldsimon
Open/Closed:  Closed Planned Release:  None
lwIP version:  1.4.0

Sun 06 Apr 2014 08:41:20 PM UTC, comment #1: 

Fixed, thanks for reporting.

Simon Goldschmidt <goldsimon>
Group administrator
Mon 16 Apr 2012 03:45:07 PM UTC, original submission:  

When I was testing the code (1.4.0), I found when lwIP received an
unacceptable acknowledge (ackno == snd_nxt + 1), it output nothing.
But, according to RFC 793, page 36:

   3.  If the connection is in a synchronized state (ESTABLISHED,
   FIN-WAIT-1, FIN-WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT),
   any unacceptable segment (out of window sequence number or
   unacceptible acknowledgment number) must elicit only an empty
   acknowledgment segment containing the current send-sequence number
   and an acknowledgment indicating the next sequence number expected
   to be received, and the connection remains in the same state.

an empty acknowledgment segment should be sent.


I did not test out-of-window segment, but I guess the result should be the same.

Woody Wu <narke>

 

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2014-04-06 goldsimon StatusNone Fixed
        Assigned toNone goldsimon
        Open/ClosedOpen Closed

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