[BRIDGE] netfilter: vlan + hw checksum = bug?
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>
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index 223f827..7cac3fb 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -394,8 +394,9 @@
* 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 @@
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 @@
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)))
