1
2#ifndef __ASM_GENERIC_CHECKSUM_H
3#define __ASM_GENERIC_CHECKSUM_H
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16
17extern __wsum csum_partial(const void *buff, int len, __wsum sum);
18
19#ifndef ip_fast_csum
20
21
22
23
24extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
25#endif
26
27#ifndef csum_fold
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29
30
31static inline __sum16 csum_fold(__wsum csum)
32{
33 u32 sum = (__force u32)csum;
34 sum = (sum & 0xffff) + (sum >> 16);
35 sum = (sum & 0xffff) + (sum >> 16);
36 return (__force __sum16)~sum;
37}
38#endif
39
40#ifndef csum_tcpudp_nofold
41
42
43
44
45extern __wsum
46csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
47 __u8 proto, __wsum sum);
48#endif
49
50#ifndef csum_tcpudp_magic
51static inline __sum16
52csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len,
53 __u8 proto, __wsum sum)
54{
55 return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
56}
57#endif
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62
63extern __sum16 ip_compute_csum(const void *buff, int len);
64
65#endif
66