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1 | #ifndef __ASM_SH_CHECKSUM_64_H |
2 | #define __ASM_SH_CHECKSUM_64_H | |
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3 | |
4 | /* | |
a23ba435 | 5 | * include/asm-sh/checksum_64.h |
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6 | * |
7 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
8 | * | |
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9 | * This file is subject to the terms and conditions of the GNU General Public |
10 | * License. See the file "COPYING" in the main directory of this archive | |
11 | * for more details. | |
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12 | */ |
13 | ||
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14 | /* |
15 | * computes the checksum of a memory block at buff, length len, | |
16 | * and adds in "sum" (32-bit) | |
17 | * | |
18 | * returns a 32-bit number suitable for feeding into itself | |
19 | * or csum_tcpudp_magic | |
20 | * | |
21 | * this function must be called with even lengths, except | |
22 | * for the last fragment, which may be odd | |
23 | * | |
24 | * it's best to have buff aligned on a 32-bit boundary | |
25 | */ | |
c459dd90 | 26 | asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum); |
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27 | |
28 | /* | |
29 | * Note: when you get a NULL pointer exception here this means someone | |
30 | * passed in an incorrect kernel address to one of these functions. | |
31 | * | |
32 | * If you use these functions directly please don't forget the | |
e49332bd | 33 | * access_ok(). |
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34 | */ |
35 | ||
36 | ||
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37 | __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, |
38 | __wsum sum); | |
1da177e4 | 39 | |
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40 | __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
41 | int len, __wsum sum, int *err_ptr); | |
1da177e4 | 42 | |
c459dd90 | 43 | static inline __sum16 csum_fold(__wsum csum) |
1da177e4 | 44 | { |
c459dd90 | 45 | u32 sum = (__force u32)csum; |
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46 | sum = (sum & 0xffff) + (sum >> 16); |
47 | sum = (sum & 0xffff) + (sum >> 16); | |
c459dd90 | 48 | return (__force __sum16)~sum; |
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49 | } |
50 | ||
c459dd90 | 51 | __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
1da177e4 | 52 | |
c459dd90 | 53 | __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
1da177e4 | 54 | unsigned short len, unsigned short proto, |
c459dd90 | 55 | __wsum sum); |
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56 | |
57 | /* | |
58 | * computes the checksum of the TCP/UDP pseudo-header | |
59 | * returns a 16-bit checksum, already complemented | |
60 | */ | |
c459dd90 | 61 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
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62 | unsigned short len, |
63 | unsigned short proto, | |
c459dd90 | 64 | __wsum sum) |
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65 | { |
66 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | |
67 | } | |
68 | ||
69 | /* | |
70 | * this routine is used for miscellaneous IP-like checksums, mainly | |
71 | * in icmp.c | |
72 | */ | |
c459dd90 | 73 | static inline __sum16 ip_compute_csum(const void *buff, int len) |
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74 | { |
75 | return csum_fold(csum_partial(buff, len, 0)); | |
76 | } | |
77 | ||
a23ba435 | 78 | #endif /* __ASM_SH_CHECKSUM_64_H */ |