Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
15 | static inline __u8 ipv4_get_dsfield(struct iphdr *iph) | |
16 | { | |
17 | return iph->tos; | |
18 | } | |
19 | ||
20 | ||
21 | static inline __u8 ipv6_get_dsfield(struct ipv6hdr *ipv6h) | |
22 | { | |
23 | return ntohs(*(__u16 *) ipv6h) >> 4; | |
24 | } | |
25 | ||
26 | ||
27 | static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask, | |
28 | __u8 value) | |
29 | { | |
30 | __u32 check = ntohs(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 = htons(check); | |
39 | iph->tos = dsfield; | |
40 | } | |
41 | ||
42 | ||
43 | static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask, | |
44 | __u8 value) | |
45 | { | |
46 | __u16 tmp; | |
47 | ||
48 | tmp = ntohs(*(__u16 *) ipv6h); | |
49 | tmp = (tmp & ((mask << 4) | 0xf00f)) | (value << 4); | |
50 | *(__u16 *) ipv6h = htons(tmp); | |
51 | } | |
52 | ||
53 | ||
54 | #endif |