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From: Rui Paulo <rpaulo@FreeBSD.org>
To: Perforce Change Reviews <perforce@FreeBSD.org>
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Subject: PERFORCE change 143761 for review
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http://perforce.freebsd.org/chv.cgi?CH=143761

Change 143761 by rpaulo@rpaulo_sigma on 2008/06/19 13:19:41

	Ignore syn/ack for connections we have seen no syn.

Affected files ...

.. //depot/projects/soc2008/rpaulo-tcpad/handler.c#7 edit

Differences ...

==== //depot/projects/soc2008/rpaulo-tcpad/handler.c#7 (text+ko) ====

@@ -23,7 +23,7 @@
  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  *
- * $P4: //depot/projects/soc2008/rpaulo-tcpad/handler.c#6 $
+ * $P4: //depot/projects/soc2008/rpaulo-tcpad/handler.c#7 $
  */
 
 #include <stdio.h>
@@ -99,6 +99,12 @@
 		TAILQ_INIT(cp->pktshead);
 		dumper_addpkt(cp->pktshead, ph, bytes);
 	} else if ((tcp->th_flags & TH_FLAGS) == (TH_SYN|TH_ACK)) {
+		if (rcp == NULL) {
+			/* ignore this syn+ack because we missed
+			   the earlier syn.
+			 */
+			 return;
+		}
 		if (cp) {
 			DPRINTF("connection already being tracked!\n");
 			print_packet(bytes, linkhlen);