[NETFILTER]: x_tables: replace IPv4 dscp match by address family independent version

This replaces IPv4 dscp match by address family independent version.
This also
	- utilizes dsfield.h to get the DS field in IPv4/IPv6 header, and
	- checks for the DSCP value from user space.
	- fixes Kconfig help text.

Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 29 insertions, 8 deletions

diff --git a/include/linux/netfilter/xt_dscp.h b/include/linux/netfilter/xt_dscp.h
new file mode 100644
index 000000000000..1da61e6acaf7
--- /dev/null
+++ b/include/linux/netfilter/xt_dscp.h
@@ -0,0 +1,23 @@
+/* x_tables module for matching the IPv4/IPv6 DSCP field
+ *
+ * (C) 2002 Harald Welte <laforge@gnumonks.org>
+ * This software is distributed under GNU GPL v2, 1991
+ *
+ * See RFC2474 for a description of the DSCP field within the IP Header.
+ *
+ * xt_dscp.h,v 1.3 2002/08/05 19:00:21 laforge Exp
+*/
+#ifndef _XT_DSCP_H
+#define _XT_DSCP_H
+
+#define XT_DSCP_MASK    0xfc    /* 11111100 */
+#define XT_DSCP_SHIFT   2
+#define XT_DSCP_MAX     0x3f    /* 00111111 */
+
+/* match info */
+struct xt_dscp_info {
+        u_int8_t dscp;
+        u_int8_t invert;
+};
+
+#endif /* _XT_DSCP_H */
diff --git a/include/linux/netfilter_ipv4/ipt_dscp.h b/include/linux/netfilter_ipv4/ipt_dscp.h
index 2fa6dfe92894..4b82ca912b0e 100644
--- a/include/linux/netfilter_ipv4/ipt_dscp.h
+++ b/include/linux/netfilter_ipv4/ipt_dscp.h
@@ -10,14 +10,12 @@
 #ifndef _IPT_DSCP_H
 #define _IPT_DSCP_H
 
-#define IPT_DSCP_MASK   0xfc    /* 11111100 */
-#define IPT_DSCP_SHIFT  2
-#define IPT_DSCP_MAX    0x3f    /* 00111111 */
+#include <linux/netfilter/xt_dscp.h>
 
-/* match info */
-struct ipt_dscp_info {
-        u_int8_t dscp;
-        u_int8_t invert;
-};
+#define IPT_DSCP_MASK   XT_DSCP_MASK
+#define IPT_DSCP_SHIFT  XT_DSCP_SHIFT
+#define IPT_DSCP_MAX    XT_DSCP_MAX
+
+#define ipt_dscp_info   xt_dscp_info
 
 #endif /* _IPT_DSCP_H */