netdev - Re: [PATCH] netfilter/IPv6: fix DSCP mangle code

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Date:	Fri, 22 Apr 2011 00:08:38 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	fernando@....ntt.co.jp
Cc:	netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org,
	jengelh@...ozas.de, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH] netfilter/IPv6: fix DSCP mangle code

From: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
Date: Fri, 22 Apr 2011 16:02:39 +0900

> The mask indicates the bits one wants to zero out, so it needs to be
> inverted before applying to the original TOS field.
> 
> Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
> ---

Netfilter patches should be sent to the netfilter developer
list, CC:'d

> diff -urNp linux-2.6.37-orig/net/netfilter/xt_DSCP.c linux-2.6.37/net/netfilter/xt_DSCP.c
> --- linux-2.6.37-orig/net/netfilter/xt_DSCP.c	2011-01-05 09:50:19.000000000 +0900
> +++ linux-2.6.37/net/netfilter/xt_DSCP.c	2011-04-21 16:01:25.801890733 +0900
> @@ -99,7 +99,7 @@ tos_tg6(struct sk_buff *skb, const struc
>  	u_int8_t orig, nv;
>  
>  	orig = ipv6_get_dsfield(iph);
> -	nv   = (orig & info->tos_mask) ^ info->tos_value;
> +	nv   = (orig & ~info->tos_mask) ^ info->tos_value;
>  
>  	if (orig != nv) {
>  		if (!skb_make_writable(skb, sizeof(struct iphdr)))
> 
> 
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