Subject: Re: [RFC PATCH] NET: Clone the sk_buff->iif field properly

From: Jarek Poplawski <[email-masked]>
Date: Thu, 3 Jan 2008 10:58:29 +0100

On 02-01-2008 17:01, Paul Moore wrote:
> When sk_buffs are cloned the iif field of the new, cloned packet is neither
> zeroed out or copied from the existing sk_buff.  The result is that the newly
> cloned sk_buff has garbage in the iif field which is a Bad Thing.  This patch
> fixes this problem by copying the iif field along with the other sk_buff
> critical fields in __copy_skb_header().
> 
> This patch is needed by some of the labeled networking changes proposed for
> 2.6.25, does anyone have any objections?

Probably Jamal could be the most interested (added to CC):

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=a057ae3c104dd2c661e55d2af37e70d168c65e00

Regards,
Jarek P.

> ---
> 
>  net/core/skbuff.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index 5b4ce9b..9cb7bb7 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -371,6 +371,7 @@ static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
>  {
>  	new->tstamp		= old->tstamp;
>  	new->dev		= old->dev;
> +	new->iif		= old->iif;
>  	new->transport_header	= old->transport_header;
>  	new->network_header	= old->network_header;
>  	new->mac_header		= old->mac_header;
>