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dccp: Fix to handle short sequence numbers packet correctly

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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.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Acked-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wei Yongjun 2008-05-27 06:22:38 -07:00 committed by David S. Miller
parent 289c79a4bd
commit 6079a463cf
1 changed files with 2 additions and 2 deletions
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4
net/dccp/ipv4.c
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@ -739,8 +739,8 @@ int dccp_invalid_packet(struct sk_buff *skb)
* 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;