From 1ed2f73d90fb49bcf5704aee7e9084adb882bfc5 Mon Sep 17 00:00:00 2001
From: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Date: Tue, 10 May 2011 10:00:21 +0200
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@oss.ntt.co.jp>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/netfilter/xt_DSCP.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/netfilter/xt_DSCP.c b/net/netfilter/xt_DSCP.c
index 0a229191e55b..ae8271652efa 100644
--- a/net/netfilter/xt_DSCP.c
+++ b/net/netfilter/xt_DSCP.c
@@ -99,7 +99,7 @@ tos_tg6(struct sk_buff *skb, const struct xt_action_param *par)
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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