Date: Sun, 12 Feb 2006 18:40:09 GMT From: Grant Edwards <grante@visi.com> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/93236: [PATCH] Received out of window SYN in ESTABLISHED connection isn't ACKed as required by RFC793 Message-ID: <200602121840.k1CIe97P098226@freefall.freebsd.org>
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The following reply was made to PR kern/93236; it has been noted by GNATS.
From: Grant Edwards <grante@visi.com>
To: bug-followup@FreeBSD.org, grante@visi.com
Cc:
Subject: Re: kern/93236: [PATCH] Received out of window SYN in ESTABLISHED
connection isn't ACKed as required by RFC793
Date: Sun, 12 Feb 2006 12:38:57 -0600
This is a multi-part message in MIME format.
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Here's the patch attached as a file.
--------------050209060503090801090106
Content-Type: text/plain;
name="tcp_input.c.patch"
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Content-Disposition: inline;
filename="tcp_input.c.patch"
--- tcp_input.c-orig 2006-02-12 10:24:35.988707395 -0600
+++ tcp_input.c 2006-02-12 10:25:28.877515703 -0600
@@ -1758,20 +1758,22 @@
/*
* If the ACK bit is off: if in SYN-RECEIVED state or SENDSYN
* flag is on (half-synchronized state), then queue data for
* later processing; else drop segment and return.
*/
if ((thflags & TH_ACK) == 0) {
if (tp->t_state == TCPS_SYN_RECEIVED ||
(tp->t_flags & TF_NEEDSYN))
goto step6;
+ else if (tp->t_flags & TF_ACKNOW)
+ goto dropafterack;
else
goto drop;
}
/*
* Ack processing.
*/
switch (tp->t_state) {
/*
--------------050209060503090801090106--
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