[PATCH 1/4] DCCP: Fix to check the sequence number in ICMP message correctly

[Wei Yongjun <yjwei@xxxxxxxxxxxxxx>]

The payload of ICMP message is a part of the packet which send by 
ourself, so check the sequence number must used 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@xxxxxxxxxxxxxx>

diff -Nurp a/net/dccp/ipv4.c b/net/dccp/ipv4.c
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -237,7 +237,7 @@ 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(LINUX_MIB_OUTOFWINDOWICMPS);
		goto out;
	}



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