diff --git a/include/net/dsfield.h b/include/net/dsfield.h
new file mode 100644
index 0000000..a79c9e0
--- /dev/null
+++ b/include/net/dsfield.h
@@ -0,0 +1,54 @@
+/* include/net/dsfield.h - Manipulation of the Differentiated Services field */
+
+/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
+
+
+#ifndef __NET_DSFIELD_H
+#define __NET_DSFIELD_H
+
+#include <linux/types.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <asm/byteorder.h>
+
+
+static inline __u8 ipv4_get_dsfield(struct iphdr *iph)
+{
+	return iph->tos;
+}
+
+
+static inline __u8 ipv6_get_dsfield(struct ipv6hdr *ipv6h)
+{
+	return ntohs(*(__u16 *) ipv6h) >> 4;
+}
+
+
+static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask,
+    __u8 value)
+{
+        __u32 check = ntohs(iph->check);
+	__u8 dsfield;
+
+	dsfield = (iph->tos & mask) | value;
+	check += iph->tos;
+	if ((check+1) >> 16) check = (check+1) & 0xffff;
+	check -= dsfield;
+	check += check >> 16; /* adjust carry */
+	iph->check = htons(check);
+	iph->tos = dsfield;
+}
+
+
+static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
+    __u8 value)
+{
+        __u16 tmp;
+
+	tmp = ntohs(*(__u16 *) ipv6h);
+	tmp = (tmp & ((mask << 4) | 0xf00f)) | (value << 4);
+	*(__u16 *) ipv6h = htons(tmp);
+}
+
+
+#endif