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[NETFILTER]: Don't checksum CHECKSUM_UNNECESSARY skbs in TCP connection tracking

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Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2005-05-03 14:23:50 -07:00 committed by David S. Miller
parent b433095784
commit 31da185d81
1 changed files with 1 additions and 0 deletions
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net/ipv4/netfilter/ip_conntrack_proto_tcp.c
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@ -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))) {