Commit d68f0866 authored Jul 26, 2008 by Wei Yongjun Committed by Gerrit Renker Jul 26, 2008

dccp: Fix sequence number check for ICMPv4 packets



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@cn.fujitsu.com>
Acked-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>

parent 73f18fdb

net/dccp/ipv4.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}