netdev - [PATCH 3/6] dccp: Fix sequence number check for ICMPv4 packets

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Message-Id: <1216976578-17767-4-git-send-email-gerrit@erg.abdn.ac.uk>
Date:	Fri, 25 Jul 2008 10:02:55 +0100
From:	Gerrit Renker <gerrit@....abdn.ac.uk>
To:	davem@...emloft.net
Cc:	dccp@...r.kernel.org, netdev@...r.kernel.org,
	Wei Yongjun <yjwei@...fujitsu.com>
Subject: [PATCH 3/6] dccp: Fix sequence number check for ICMPv4 packets

From: Wei Yongjun <yjwei@...fujitsu.com>

The payload of ICMP message is a part of the packet sent by ourself,
so the sequence number check must use AWL and AWH, not SWL and SWH.

For example:
     Endpoint A                  Endpoint B

     DATA-ACK       -------->
     (SEQ=X)
                    <--------    ICMP (Fragmentation Needed)
                                 (SEQ=X)

Signed-off-by: Wei Yongjun <yjwei@...fujitsu.com>
Acked-by: Gerrit Renker <gerrit@....abdn.ac.uk>
---
 net/dccp/ipv4.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -238,7 +238,7 @@ static void dccp_v4_err(struct sk_buff *skb, u32 info)
 	dp = dccp_sk(sk);
 	seq = dccp_hdr_seq(dh);
 	if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) &&
-	    !between48(seq, dp->dccps_swl, dp->dccps_swh)) {
+	    !between48(seq, dp->dccps_awl, dp->dccps_awh)) {
 		NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
 		goto out;
 	}
--
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