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1 | #ifndef _ASM_IA64_CHECKSUM_H |
2 | #define _ASM_IA64_CHECKSUM_H | |
3 | ||
4 | /* | |
5 | * Modified 1998, 1999 | |
6 | * David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co | |
7 | */ | |
8 | ||
9 | /* | |
10 | * This is a version of ip_compute_csum() optimized for IP headers, | |
11 | * which always checksum on 4 octet boundaries. | |
12 | */ | |
32252996 | 13 | extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
1da177e4 LT |
14 | |
15 | /* | |
16 | * Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit | |
17 | * checksum, already complemented | |
18 | */ | |
32252996 | 19 | extern __sum16 csum_tcpudp_magic (__be32 saddr, __be32 daddr, |
1da177e4 LT |
20 | unsigned short len, |
21 | unsigned short proto, | |
32252996 | 22 | __wsum sum); |
1da177e4 | 23 | |
32252996 | 24 | extern __wsum csum_tcpudp_nofold (__be32 saddr, __be32 daddr, |
1da177e4 LT |
25 | unsigned short len, |
26 | unsigned short proto, | |
32252996 | 27 | __wsum sum); |
1da177e4 LT |
28 | |
29 | /* | |
30 | * Computes the checksum of a memory block at buff, length len, | |
31 | * and adds in "sum" (32-bit) | |
32 | * | |
33 | * returns a 32-bit number suitable for feeding into itself | |
34 | * or csum_tcpudp_magic | |
35 | * | |
36 | * this function must be called with even lengths, except | |
37 | * for the last fragment, which may be odd | |
38 | * | |
39 | * it's best to have buff aligned on a 32-bit boundary | |
40 | */ | |
32252996 | 41 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
1da177e4 LT |
42 | |
43 | /* | |
44 | * Same as csum_partial, but copies from src while it checksums. | |
45 | * | |
46 | * Here it is even more important to align src and dst on a 32-bit (or | |
47 | * even better 64-bit) boundary. | |
48 | */ | |
32252996 AV |
49 | extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
50 | int len, __wsum sum, | |
1da177e4 LT |
51 | int *errp); |
52 | ||
32252996 AV |
53 | extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, |
54 | int len, __wsum sum); | |
1da177e4 LT |
55 | |
56 | /* | |
57 | * This routine is used for miscellaneous IP-like checksums, mainly in | |
58 | * icmp.c | |
59 | */ | |
32252996 | 60 | extern __sum16 ip_compute_csum(const void *buff, int len); |
1da177e4 LT |
61 | |
62 | /* | |
63 | * Fold a partial checksum without adding pseudo headers. | |
64 | */ | |
32252996 | 65 | static inline __sum16 csum_fold(__wsum csum) |
1da177e4 | 66 | { |
32252996 | 67 | u32 sum = (__force u32)csum; |
1da177e4 LT |
68 | sum = (sum & 0xffff) + (sum >> 16); |
69 | sum = (sum & 0xffff) + (sum >> 16); | |
32252996 | 70 | return (__force __sum16)~sum; |
1da177e4 LT |
71 | } |
72 | ||
007d77d0 CK |
73 | #define _HAVE_ARCH_IPV6_CSUM 1 |
74 | struct in6_addr; | |
73f66ace AV |
75 | extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
76 | const struct in6_addr *daddr, __u32 len, unsigned short proto, | |
77 | __wsum csum); | |
007d77d0 | 78 | |
1da177e4 | 79 | #endif /* _ASM_IA64_CHECKSUM_H */ |