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[NETFILTER]: Fix HW checksum handling in ECN target 

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2005-08-20 17:39:15 -07:00 committed by David S. Miller
parent fd841326d7
commit f93592ff4f
1 changed files with 5 additions and 4 deletions
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9
net/ipv4/netfilter/ipt_ECN.c
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@ -71,6 +71,10 @@ set_ect_tcp(struct sk_buff **pskb, const struct ipt_ECN_info *einfo, int inward)
return 0;
tcph = (void *)(*pskb)->nh.iph + (*pskb)->nh.iph->ihl*4;
if ((*pskb)->ip_summed == CHECKSUM_HW &&
skb_checksum_help(*pskb, inward))
return 0;
diffs[0] = ((u_int16_t *)tcph)[6];
if (einfo->operation & IPT_ECN_OP_SET_ECE)
tcph->ece = einfo->proto.tcp.ece;
@ -79,13 +83,10 @@ set_ect_tcp(struct sk_buff **pskb, const struct ipt_ECN_info *einfo, int inward)
diffs[1] = ((u_int16_t *)tcph)[6];
diffs[0] = diffs[0] ^ 0xFFFF;
if ((*pskb)->ip_summed != CHECKSUM_HW)
if ((*pskb)->ip_summed != CHECKSUM_UNNECESSARY)
tcph->check = csum_fold(csum_partial((char *)diffs,
sizeof(diffs),
tcph->check^0xFFFF));
else
if (skb_checksum_help(*pskb, inward))
return 0;
(*pskb)->nfcache |= NFC_ALTERED;
return 1;
}