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[NETFILTER]: Don't checksum CHECKSUM_UNNECESSARY skbs in TCP connection tracking
author
Patrick McHardy
<kaber@trash.net>
Tue, 3 May 2005 21:23:50 +0000
(14:23 -0700)
committer
David S. Miller
<davem@davemloft.net>
Tue, 3 May 2005 21:23:50 +0000
(14:23 -0700)
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/netfilter/ip_conntrack_proto_tcp.c
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diff --git
a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
index
2b87c19
..
721ddbf
100644
(file)
--- 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))) {