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[NETFILTER]: nf_conntrack: Fix TCP/UDP HW checksum handling for IPv6 packet

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If skb->ip_summed is CHECKSUM_HW here, skb->csum includes checksum
of actual IPv6 header and extension headers. Then such excess
checksum must be subtruct when nf_conntrack calculates TCP/UDP checksum
with pseudo IPv6 header. Spotted by Ben Skeggs.

Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yasuyuki Kozakai 2006-02-15 15:25:18 -08:00 committed by David S. Miller
parent 763ecff187
commit 7c6de05884
2 changed files with 6 additions and 2 deletions
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4
net/netfilter/nf_conntrack_proto_tcp.c
View file

@ -864,7 +864,9 @@ static int csum6(const struct sk_buff *skb, unsigned int dataoff)
{
return csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr,
skb->len - dataoff, IPPROTO_TCP,
skb->ip_summed == CHECKSUM_HW ? skb->csum
skb->ip_summed == CHECKSUM_HW
? csum_sub(skb->csum,
skb_checksum(skb, 0, dataoff, 0))
: skb_checksum(skb, dataoff, skb->len - dataoff,
0));
}

4
net/netfilter/nf_conntrack_proto_udp.c
View file

@ -161,7 +161,9 @@ static int csum6(const struct sk_buff *skb, unsigned int dataoff)
{
return csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr,
skb->len - dataoff, IPPROTO_UDP,
skb->ip_summed == CHECKSUM_HW ? skb->csum
skb->ip_summed == CHECKSUM_HW
? csum_sub(skb->csum,
skb_checksum(skb, 0, dataoff, 0))
: skb_checksum(skb, dataoff, skb->len - dataoff,
0));
}