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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _ASM_IA64_CHECKSUM_H |
3 | #define _ASM_IA64_CHECKSUM_H | |
4 | ||
5 | /* | |
6 | * Modified 1998, 1999 | |
7 | * David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co | |
8 | */ | |
9 | ||
10 | /* | |
11 | * This is a version of ip_compute_csum() optimized for IP headers, | |
12 | * which always checksum on 4 octet boundaries. | |
13 | */ | |
32252996 | 14 | extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
1da177e4 LT |
15 | |
16 | /* | |
17 | * Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit | |
18 | * checksum, already complemented | |
19 | */ | |
01cfbad7 AD |
20 | extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
21 | __u32 len, __u8 proto, __wsum sum); | |
1da177e4 | 22 | |
01cfbad7 AD |
23 | extern __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
24 | __u32 len, __u8 proto, __wsum sum); | |
1da177e4 LT |
25 | |
26 | /* | |
27 | * Computes the checksum of a memory block at buff, length len, | |
28 | * and adds in "sum" (32-bit) | |
29 | * | |
30 | * returns a 32-bit number suitable for feeding into itself | |
31 | * or csum_tcpudp_magic | |
32 | * | |
33 | * this function must be called with even lengths, except | |
34 | * for the last fragment, which may be odd | |
35 | * | |
36 | * it's best to have buff aligned on a 32-bit boundary | |
37 | */ | |
32252996 | 38 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
1da177e4 LT |
39 | |
40 | /* | |
41 | * Same as csum_partial, but copies from src while it checksums. | |
42 | * | |
43 | * Here it is even more important to align src and dst on a 32-bit (or | |
44 | * even better 64-bit) boundary. | |
45 | */ | |
32252996 AV |
46 | extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
47 | int len, __wsum sum, | |
1da177e4 LT |
48 | int *errp); |
49 | ||
32252996 AV |
50 | extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, |
51 | int len, __wsum sum); | |
1da177e4 LT |
52 | |
53 | /* | |
54 | * This routine is used for miscellaneous IP-like checksums, mainly in | |
55 | * icmp.c | |
56 | */ | |
32252996 | 57 | extern __sum16 ip_compute_csum(const void *buff, int len); |
1da177e4 LT |
58 | |
59 | /* | |
60 | * Fold a partial checksum without adding pseudo headers. | |
61 | */ | |
32252996 | 62 | static inline __sum16 csum_fold(__wsum csum) |
1da177e4 | 63 | { |
32252996 | 64 | u32 sum = (__force u32)csum; |
1da177e4 LT |
65 | sum = (sum & 0xffff) + (sum >> 16); |
66 | sum = (sum & 0xffff) + (sum >> 16); | |
32252996 | 67 | return (__force __sum16)~sum; |
1da177e4 LT |
68 | } |
69 | ||
007d77d0 KC |
70 | #define _HAVE_ARCH_IPV6_CSUM 1 |
71 | struct in6_addr; | |
73f66ace | 72 | extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
1e940829 AD |
73 | const struct in6_addr *daddr, |
74 | __u32 len, __u8 proto, __wsum csum); | |
007d77d0 | 75 | |
1da177e4 | 76 | #endif /* _ASM_IA64_CHECKSUM_H */ |