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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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
Jan Engelhardt3c3f4862007-12-04 23:37:29 -080015static inline __u8 ipv4_get_dsfield(const struct iphdr *iph)
Linus Torvalds1da177e2005-04-16 15:20:36 -070016{
17 return iph->tos;
18}
19
20
Jan Engelhardt3c3f4862007-12-04 23:37:29 -080021static inline __u8 ipv6_get_dsfield(const struct ipv6hdr *ipv6h)
Linus Torvalds1da177e2005-04-16 15:20:36 -070022{
Jan Engelhardt3c3f4862007-12-04 23:37:29 -080023 return ntohs(*(const __be16 *)ipv6h) >> 4;
Linus Torvalds1da177e2005-04-16 15:20:36 -070024}
25
26
27static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask,
28 __u8 value)
29{
Al Viro5c78f272006-11-14 21:42:26 -080030 __u32 check = ntohs((__force __be16)iph->check);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 __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 */
Al Viro5c78f272006-11-14 21:42:26 -080038 iph->check = (__force __sum16)htons(check);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 iph->tos = dsfield;
40}
41
42
43static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
44 __u8 value)
45{
YOSHIFUJI Hideaki / 吉藤英明a0376db2013-01-08 06:47:08 +000046 __be16 *p = (__force __be16 *)ipv6h;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
YOSHIFUJI Hideaki / 吉藤英明a0376db2013-01-08 06:47:08 +000048 *p = (*p & htons((((u16)mask << 4) | 0xf00f))) | htons((u16)value << 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049}
50
51
52#endif