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netfilter: IPv6: fix DSCP mangle code
author
Fernando Luis Vazquez Cao
<fernando@oss.ntt.co.jp>
Tue, 10 May 2011 08:00:21 +0000
(10:00 +0200)
committer
Pablo Neira Ayuso
<pablo@netfilter.org>
Tue, 10 May 2011 08:00:21 +0000
(10:00 +0200)
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
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diff --git
a/net/netfilter/xt_DSCP.c
b/net/netfilter/xt_DSCP.c
index
0a22919
..
ae82716
100644
(file)
--- 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)))