netdev - [PATCH] DCCP: Fix to handle short sequence numbers packet correctly

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Message-ID: <48361920.9090309@cn.fujitsu.com>
Date:	Fri, 23 May 2008 09:08:48 +0800
From:	Wei Yongjun <yjwei@...fujitsu.com>
To:	Gerrit Renker <gerrit@....abdn.ac.uk>,
	David Miller <davem@...emloft.net>
CC:	Wei Yongjun <yjwei@...fujitsu.com>, dccp@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH] DCCP: Fix to handle short sequence numbers packet correctly

RFC4340 said:
  8.5.  Pseudocode
       ...
       If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet
             has short sequence numbers), drop packet and return

But DCCP has some mistake to handle short sequence numbers packet, now 
it drop packet only if P.type is Data, Ack, or DataAck and P.X == 0.

This patch fixed this problem.

Signed-off-by: Wei Yongjun <yjwei@...fujitsu.com>
Acked-by: Gerrit Renker <gerrit@....abdn.ac.uk>

--- a/net/dccp/ipv4.c	2008-05-18 11:54:29.000000000 -0400
+++ b/net/dccp/ipv4.c	2008-05-18 11:55:51.000000000 -0400
@@ -741,8 +741,8 @@ int dccp_invalid_packet(struct sk_buff *
 	 * If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet
 	 * has short sequence numbers), drop packet and return
 	 */
-	if (dh->dccph_type >= DCCP_PKT_DATA    &&
-	    dh->dccph_type <= DCCP_PKT_DATAACK && dh->dccph_x == 0)  {
+	if ((dh->dccph_type < DCCP_PKT_DATA    ||
+	    dh->dccph_type > DCCP_PKT_DATAACK) && dh->dccph_x == 0)  {
 		DCCP_WARN("P.type (%s) not Data || [Data]Ack, while P.X == 0\n",
 			  dccp_packet_name(dh->dccph_type));
 		return 1;




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