[NETFILTER]: xt_TOS: Properly set the TOS field

Fix incorrect mask value passed to ipv4_change_dsfield/ipv6_change_dsfield.
Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/netfilter/xt_DSCP.c

@@ -134,7 +134,7 @@ tos_tg(struct sk_buff *skb, const struct net_device *in,
 		if (!skb_make_writable(skb, sizeof(struct iphdr)))
 			return NF_DROP;
 		iph = ip_hdr(skb);
-		ipv4_change_dsfield(iph, ~0, nv);
+		ipv4_change_dsfield(iph, 0, nv);
 	}
 
 	return XT_CONTINUE;
@@ -156,7 +156,7 @@ tos_tg6(struct sk_buff *skb, const struct net_device *in,
 		if (!skb_make_writable(skb, sizeof(struct iphdr)))
 			return NF_DROP;
 		iph = ipv6_hdr(skb);
-		ipv6_change_dsfield(iph, ~0, nv);
+		ipv6_change_dsfield(iph, 0, nv);
 	}
 
 	return XT_CONTINUE;