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 a835b88..6a2f187 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -238,7 +238,7 @@
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;
}