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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(const struct iphdr *iph) |
16 | { |
17 | return iph->tos; |
18 | } |
19 | |
20 | |
21 | static inline __u8 ipv6_get_dsfield(const struct ipv6hdr *ipv6h) |
22 | { |
23 | return ntohs(*(const __be16 *)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((__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 | |
43 | static 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 |
53 |
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