On Mon, 2012-04-30 at 07:38 +0200, Frank Blaschka wrote:
> From: Frank Blaschka <frank.blaschka@xxxxxxxxxx>
>
> commit 8a83a00b0735190384a348156837918271034144 unconditionally
> drops dst reference when skb->dev is set. This causes a regression
> with VLAN and the qeth_l3 network driver. qeth_l3 can not get gw
> information from the skb coming from the vlan driver. It is only
> valid to drop the dst in case of different name spaces.
>
> Signed-off-by: Frank Blaschka <frank.blaschka@xxxxxxxxxx>
> ---
> net/core/dev.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -1881,8 +1881,8 @@ EXPORT_SYMBOL(netif_device_attach);
> #ifdef CONFIG_NET_NS
> void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
> {
> - skb_dst_drop(skb);
> if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
> + skb_dst_drop(skb);
> secpath_reset(skb);
> nf_reset(skb);
> skb_init_secmark(skb);
>
You forgot CC Arnd Bergmann <arnd@xxxxxxxx> ?
But we do want to do the skb_dst_drop() in dev_forward_skb()
Your patch breaks dev_forward_skb() then.
But apparently this forward path was alredy broken in Arnd patch...
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