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[lwip-devel] [bug #22112] Recv() makes receive window update for data, t


From: Oleg Tyshev
Subject: [lwip-devel] [bug #22112] Recv() makes receive window update for data, that was not received by application
Date: Fri, 25 Jan 2008 14:40:32 +0000
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11

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: 

    _______________________________________________________

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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