netdev - Re: [PATCH] vlan: Fix the ingress VLAN_FLAG_REORDER

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Date:	Thu, 2 Jun 2011 22:54:50 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	David Miller <davem@...emloft.net>,
	shemminger@...ux-foundation.org, greearb@...delatech.com,
	nicolas.2p.debian@...il.com, jpirko@...hat.com,
	netdev@...r.kernel.org, kaber@...sh.net, fubar@...ibm.com,
	eric.dumazet@...il.com, andy@...yhouse.net, jesse@...ira.com
Subject: Re: [PATCH] vlan: Fix the ingress VLAN_FLAG_REORDER_HDR check v2

On Thu, Jun 2, 2011 at 9:03 PM, Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
> -static struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
> +static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
>  {
> -       if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
> -               if (skb_cow(skb, skb_headroom(skb)) < 0)
> -                       skb = NULL;
> -               if (skb) {
> -                       /* Lifted from Gleb's VLAN code... */
> -                       memmove(skb->data - ETH_HLEN,
> -                               skb->data - VLAN_ETH_HLEN, 12);
> -                       skb->mac_header += VLAN_HLEN;
> -               }
> +       if (skb_cow(skb, skb_headroom(skb)) < 0)
> +               skb = NULL;
> +       if (skb) {

I think an else branch maybe more readable here.

> +               /* Lifted from Gleb's VLAN code... */
> +               memmove(skb->data - ETH_HLEN,
> +                       skb->data - VLAN_ETH_HLEN, 12);
> +               skb->mac_header += VLAN_HLEN;

skb->mac_len should be adjusted too.

>        }
>        return skb;
>  }




-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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