linux-kernel - [84/85] netfilter: IPv6: fix DSCP mangle code

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Message-Id: <20110616002912.280977772@clark.kroah.org>
Date:	Wed, 15 Jun 2011 17:29:20 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>,
	Pablo Neira Ayuso <pablo@...filter.org>
Subject: [84/85] netfilter: IPv6: fix DSCP mangle code

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>

commit 1ed2f73d90fb49bcf5704aee7e9084adb882bfc5 upstream.

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>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/netfilter/xt_DSCP.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/netfilter/xt_DSCP.c
+++ b/net/netfilter/xt_DSCP.c
@@ -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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