1#ifndef __ASM_GENERIC_CHECKSUM_H
2#define __ASM_GENERIC_CHECKSUM_H
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16extern __wsum csum_partial(const void *buff, int len, __wsum sum);
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25extern __wsum csum_partial_copy(const void *src, void *dst, int len, __wsum sum);
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33extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
34 int len, __wsum sum, int *csum_err);
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36#ifndef csum_partial_copy_nocheck
37#define csum_partial_copy_nocheck(src, dst, len, sum) \
38 csum_partial_copy((src), (dst), (len), (sum))
39#endif
40
41#ifndef ip_fast_csum
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46extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
47#endif
48
49#ifndef csum_fold
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53static inline __sum16 csum_fold(__wsum csum)
54{
55 u32 sum = (__force u32)csum;
56 sum = (sum & 0xffff) + (sum >> 16);
57 sum = (sum & 0xffff) + (sum >> 16);
58 return (__force __sum16)~sum;
59}
60#endif
61
62#ifndef csum_tcpudp_nofold
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67extern __wsum
68csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
69 __u8 proto, __wsum sum);
70#endif
71
72#ifndef csum_tcpudp_magic
73static inline __sum16
74csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len,
75 __u8 proto, __wsum sum)
76{
77 return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
78}
79#endif
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85extern __sum16 ip_compute_csum(const void *buff, int len);
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87#endif
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