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