[lwip-devel] [bug #22112] Recv() makes receive window update for data, that was not received by application

[Oleg Tyshev]

URL:
  <http://savannah.nongnu.org/bugs/?22112>

                 Summary: Recv() makes receive window update for data, that
was not received by application 
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: olegreen
            Submitted on: Friday 01/25/2008 at 14:40
                Category: TCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 

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Details:

Sample:

Receive mailbox contains 4 packets each 1000 bytes.
Application makes recv() for 1 byte.
It will be receive window update sent, as if
application 1000 received.

The problem is, that receive buffer is separated to two parts:
receive mailbox and sock->lastdata.
Lwip considers that data in sock->lastdata processed immediately.
But application can take only part of the data from sock->lastdata.
And windows update should be sent only to the part that application realy
received.





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