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

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Date:	Fri, 22 Apr 2011 16:02:39 +0900
From:	Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, yoshfuji@...ux-ipv6.org, jengelh@...ozas.de
Subject: [PATCH] netfilter/IPv6:  fix DSCP mangle code

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>
---

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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