summaryrefslogtreecommitdiffstats
path: root/include/net/dsfield.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/net/dsfield.h')
-rw-r--r--include/net/dsfield.h53
1 files changed, 53 insertions, 0 deletions
diff --git a/include/net/dsfield.h b/include/net/dsfield.h
new file mode 100644
index 000000000..a59a57ffc
--- /dev/null
+++ b/include/net/dsfield.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* 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(const struct iphdr *iph)
+{
+ return iph->tos;
+}
+
+
+static inline __u8 ipv6_get_dsfield(const struct ipv6hdr *ipv6h)
+{
+ return ntohs(*(__force const __be16 *)ipv6h) >> 4;
+}
+
+
+static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask,
+ __u8 value)
+{
+ __u32 check = ntohs((__force __be16)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 = (__force __sum16)htons(check);
+ iph->tos = dsfield;
+}
+
+
+static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
+ __u8 value)
+{
+ __be16 *p = (__force __be16 *)ipv6h;
+
+ *p = (*p & htons((((u16)mask << 4) | 0xf00f))) | htons((u16)value << 4);
+}
+
+
+#endif