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>

diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index a835b88237cbb77d295ba7a036c57b17a1871f91..6a2f1879e183db0f94bf11ae0b85878e0e045c12 100644 (file)
--- 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;
        }