1/* SPDX-License-Identifier: GPL-2.0 */
 2/* include/net/dsfield.h - Manipulation of the Differentiated Services field */
 3
 4/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
 5
 6
 7#ifndef __NET_DSFIELD_H
 8#define __NET_DSFIELD_H
 9
10#include <linux/types.h>
11#include <linux/ip.h>
12#include <linux/ipv6.h>
13#include <asm/byteorder.h>
14
15
16static inline __u8 ipv4_get_dsfield(const struct iphdr *iph)
17{
18	return iph->tos;
19}
20
21
22static inline __u8 ipv6_get_dsfield(const struct ipv6hdr *ipv6h)
23{
24	return ntohs(*(const __be16 *)ipv6h) >> 4;
25}
26
27
28static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask,
29    __u8 value)
30{
31        __u32 check = ntohs((__force __be16)iph->check);
32	__u8 dsfield;
33
34	dsfield = (iph->tos & mask) | value;
35	check += iph->tos;
36	if ((check+1) >> 16) check = (check+1) & 0xffff;
37	check -= dsfield;
38	check += check >> 16; /* adjust carry */
39	iph->check = (__force __sum16)htons(check);
40	iph->tos = dsfield;
41}
42
43
44static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
45    __u8 value)
46{
47	__be16 *p = (__force __be16 *)ipv6h;
48
49	*p = (*p & htons((((u16)mask << 4) | 0xf00f))) | htons((u16)value << 4);
50}
51
52
53#endif

 
 1/* include/net/dsfield.h - Manipulation of the Differentiated Services field */
 2
 3/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
 4
 5
 6#ifndef __NET_DSFIELD_H
 7#define __NET_DSFIELD_H
 8
 9#include <linux/types.h>
10#include <linux/ip.h>
11#include <linux/ipv6.h>
12#include <asm/byteorder.h>
13
14
15static inline __u8 ipv4_get_dsfield(const struct iphdr *iph)
16{
17	return iph->tos;
18}
19
20
21static inline __u8 ipv6_get_dsfield(const struct ipv6hdr *ipv6h)
22{
23	return ntohs(*(const __be16 *)ipv6h) >> 4;
24}
25
26
27static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask,
28    __u8 value)
29{
30        __u32 check = ntohs((__force __be16)iph->check);
31	__u8 dsfield;
32
33	dsfield = (iph->tos & mask) | value;
34	check += iph->tos;
35	if ((check+1) >> 16) check = (check+1) & 0xffff;
36	check -= dsfield;
37	check += check >> 16; /* adjust carry */
38	iph->check = (__force __sum16)htons(check);
39	iph->tos = dsfield;
40}
41
42
43static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
44    __u8 value)
45{
46	__be16 *p = (__force __be16 *)ipv6h;
47
48	*p = (*p & htons((((u16)mask << 4) | 0xf00f))) | htons((u16)value << 4);
49}
50
51
52#endif