patch-2.3.38 linux/include/net/dsfield.h

• Lines: 80
• Date: Fri Jan 7 16:57:13 2000
• Orig file: v2.3.37/linux/include/net/dsfield.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.37/linux/include/net/dsfield.h linux/include/net/dsfield.h
@@ -0,0 +1,79 @@
+/* include/net/dsfield.h - Manipulation of the Differentiated Services field */
+
+/* Written 1998 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>
+
+
+extern __inline__ __u8 ipv4_get_dsfield(struct iphdr *iph)
+{
+	return iph->tos;
+}
+
+
+extern __inline__ __u8 ipv6_get_dsfield(struct ipv6hdr *ipv6h)
+{
+	return ntohs(*(__u16 *) ipv6h) >> 4;
+}
+
+
+extern __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;
+}
+
+
+extern __inline__ void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
+    __u8 value)
+{
+        __u16 tmp;
+
+	tmp = ntohs(*(__u16 *) ipv6h);
+	tmp = (tmp & (mask << 4)) | (value << 4);
+	*(__u16 *) ipv6h = htons(tmp);
+}
+
+
+#if 0 /* put this later into asm-i386 or such ... */
+
+extern __inline__ void ip_change_dsfield(struct iphdr *iph,__u16 dsfield)
+{
+	__u16 check;
+
+	__asm__ __volatile__("
+		movw	10(%1),%0
+		xchg	%b0,%h0
+		addb	1(%1),%b0
+		adcb	$0,%h0
+		adcw	$1,%0
+		cmc
+		sbbw	%2,%0
+		sbbw	$0,%0
+		movb	%b2,1(%1)
+		xchg	%b0,%h0
+		movw	%0,10(%1)"
+	    : "=&r" (check)
+	    : "r" (iph), "r" (dsfield)
+	    : "cc");
+}
+
+#endif
+
+#endif