From: Stephen Hemminger <shemminger@linux-foundation.org>
To: netdev@vger.kernel.org
Subject: Fw: [Bug 12014] New: Incorrect Urgent Pointer in outgoing packets
Date: Wed, 12 Nov 2008 08:27:35 -0800 [thread overview]
Message-ID: <20081112082735.5aa06a15@extreme> (raw)
Begin forwarded message:
Date: Wed, 12 Nov 2008 02:16:33 -0800 (PST)
From: bugme-daemon@bugzilla.kernel.org
To: shemminger@linux-foundation.org
Subject: [Bug 12014] New: Incorrect Urgent Pointer in outgoing packets
http://bugzilla.kernel.org/show_bug.cgi?id=12014
Summary: Incorrect Urgent Pointer in outgoing packets
Product: Networking
Version: 2.5
KernelVersion: 2.6.27
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: IPV4
AssignedTo: shemminger@linux-foundation.org
ReportedBy: kernel@tesarici.cz
Latest working kernel version: ??? (maybe never)
Earliest failing kernel version: 2.6.27
Distribution: kernel.org
Hardware Environment: x86, x86_64
Software Environment: Oracle, testcase
Problem Description:
When urgent mode is initiated using send(..., MSG_OOB), and the current
outgoing queue is longer than MTU, several packets are sent out with the URG
flag set. However, the Urgent Pointer field in the TCP header is not updated
correctly. Instead, it stays the same.
The receiving end interprets this as a new urgent message inserted further in
the stream, sends multiple SIGURGs to the server application and reads across
the urgent data. This behaviour is correct.
Steps to reproduce:
1. Initiate a TCP connection
2. Fill the outgoing queue with some (normal) data
3. Send an urgent message (with MSG_OOB)
4. Send some more non-urgent data.
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next reply other threads:[~2008-11-12 16:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-12 16:27 Stephen Hemminger [this message]
2008-11-12 21:12 ` Fw: [Bug 12014] New: Incorrect Urgent Pointer in outgoing packets Ilpo Järvinen
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