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[BRIDGE] netfilter: vlan + hw checksum = bug?

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It looks like the bridge netfilter code does not correctly update
the hardware checksum after popping off the VLAN header.

This is by inspection, I have *not* tested this.
To test you would need to set up a filtering bridge with vlans
and a device the does hardware receive checksum (skge, or sungem)

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2006-01-06 13:13:29 -08:00 committed by David S. Miller
parent a20a855479
commit ee02b3a613
1 changed files with 9 additions and 4 deletions
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13
net/bridge/br_netfilter.c
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@ -394,8 +394,9 @@ inhdr_error:
* target in particular. Save the original destination IP
* address to be able to detect DNAT afterwards. */
static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
const struct net_device *in, const struct net_device *out,
int (*okfn)(struct sk_buff *))
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
struct iphdr *iph;
__u32 len;
@ -412,8 +413,10 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
goto out;
if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
u8 *vhdr = skb->data;
skb_pull(skb, VLAN_HLEN);
(skb)->nh.raw += VLAN_HLEN;
skb_postpull_rcsum(skb, vhdr, VLAN_HLEN);
skb->nh.raw += VLAN_HLEN;
}
return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn);
}
@ -429,8 +432,10 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
goto out;
if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
u8 *vhdr = skb->data;
skb_pull(skb, VLAN_HLEN);
(skb)->nh.raw += VLAN_HLEN;
skb_postpull_rcsum(skb, vhdr, VLAN_HLEN);
skb->nh.raw += VLAN_HLEN;
}
if (!pskb_may_pull(skb, sizeof(struct iphdr)))