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authorPatrick McHardy <kaber@trash.net>2005-05-03 14:23:50 -0700
committerDavid S. Miller <davem@davemloft.net>2005-05-03 14:23:50 -0700
commit31da185d8162ae0f30a13ed945f1f4d28d158133 (patch)
treefd9cefbc2f8d8e95786a3a23858d3649605ad148
parentb43309578477ff3271945d4efb920f558a309b4a (diff)
[NETFILTER]: Don't checksum CHECKSUM_UNNECESSARY skbs in TCP connection tracking
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/netfilter/ip_conntrack_proto_tcp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
index 2b87c1974be..721ddbf522b 100644
--- a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
@@ -819,6 +819,7 @@ static int tcp_error(struct sk_buff *skb,
*/
/* FIXME: Source route IP option packets --RR */
if (hooknum == NF_IP_PRE_ROUTING
+ && skb->ip_summed != CHECKSUM_UNNECESSARY
&& csum_tcpudp_magic(iph->saddr, iph->daddr, tcplen, IPPROTO_TCP,
skb->ip_summed == CHECKSUM_HW ? skb->csum
: skb_checksum(skb, iph->ihl*4, tcplen, 0))) {