* [PATCH] DCCP: Fix to handle short sequence numbers packet correctly
[not found] ` <20080522090720.GA4827@gerrit.erg.abdn.ac.uk>
@ 2008-05-23 1:08 ` Wei Yongjun
0 siblings, 0 replies; only message in thread
From: Wei Yongjun @ 2008-05-23 1:08 UTC (permalink / raw)
To: Gerrit Renker, David Miller; +Cc: Wei Yongjun, dccp, netdev
RFC4340 said:
8.5. Pseudocode
...
If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet
has short sequence numbers), drop packet and return
But DCCP has some mistake to handle short sequence numbers packet, now
it drop packet only if P.type is Data, Ack, or DataAck and P.X == 0.
This patch fixed this problem.
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Acked-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
--- a/net/dccp/ipv4.c 2008-05-18 11:54:29.000000000 -0400
+++ b/net/dccp/ipv4.c 2008-05-18 11:55:51.000000000 -0400
@@ -741,8 +741,8 @@ int dccp_invalid_packet(struct sk_buff *
* If P.type is not Data, Ack, or DataAck and P.X == 0 (the packet
* has short sequence numbers), drop packet and return
*/
- if (dh->dccph_type >= DCCP_PKT_DATA &&
- dh->dccph_type <= DCCP_PKT_DATAACK && dh->dccph_x == 0) {
+ if ((dh->dccph_type < DCCP_PKT_DATA ||
+ dh->dccph_type > DCCP_PKT_DATAACK) && dh->dccph_x == 0) {
DCCP_WARN("P.type (%s) not Data || [Data]Ack, while P.X == 0\n",
dccp_packet_name(dh->dccph_type));
return 1;
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