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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _ALPHA_CHECKSUM_H |
3 | #define _ALPHA_CHECKSUM_H | |
4 | ||
5 | #include <linux/in6.h> | |
6 | ||
7 | /* | |
8 | * This is a version of ip_compute_csum() optimized for IP headers, | |
9 | * which always checksum on 4 octet boundaries. | |
10 | */ | |
9be259aa | 11 | extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
1da177e4 LT |
12 | |
13 | /* | |
14 | * computes the checksum of the TCP/UDP pseudo-header | |
15 | * returns a 16-bit checksum, already complemented | |
16 | */ | |
01cfbad7 AD |
17 | __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
18 | __u32 len, __u8 proto, __wsum sum); | |
1da177e4 | 19 | |
9be259aa | 20 | __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
01cfbad7 | 21 | __u32 len, __u8 proto, __wsum sum); |
1da177e4 LT |
22 | |
23 | /* | |
24 | * computes the checksum of a memory block at buff, length len, | |
25 | * and adds in "sum" (32-bit) | |
26 | * | |
27 | * returns a 32-bit number suitable for feeding into itself | |
28 | * or csum_tcpudp_magic | |
29 | * | |
30 | * this function must be called with even lengths, except | |
31 | * for the last fragment, which may be odd | |
32 | * | |
33 | * it's best to have buff aligned on a 32-bit boundary | |
34 | */ | |
9be259aa | 35 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
1da177e4 LT |
36 | |
37 | /* | |
38 | * the same as csum_partial, but copies from src while it | |
39 | * checksums | |
40 | * | |
41 | * here even more important to align src and dst on a 32-bit (or even | |
42 | * better 64-bit) boundary | |
43 | */ | |
808b49da | 44 | #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER |
6e41c585 | 45 | #define _HAVE_ARCH_CSUM_AND_COPY |
808b49da | 46 | __wsum csum_and_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp); |
1da177e4 | 47 | |
9be259aa | 48 | __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum); |
1da177e4 LT |
49 | |
50 | ||
51 | /* | |
52 | * this routine is used for miscellaneous IP-like checksums, mainly | |
53 | * in icmp.c | |
54 | */ | |
55 | ||
9be259aa | 56 | extern __sum16 ip_compute_csum(const void *buff, int len); |
1da177e4 LT |
57 | |
58 | /* | |
59 | * Fold a partial checksum without adding pseudo headers | |
60 | */ | |
61 | ||
9be259aa | 62 | static inline __sum16 csum_fold(__wsum csum) |
1da177e4 | 63 | { |
9be259aa | 64 | u32 sum = (__force u32)csum; |
1da177e4 LT |
65 | sum = (sum & 0xffff) + (sum >> 16); |
66 | sum = (sum & 0xffff) + (sum >> 16); | |
9be259aa | 67 | return (__force __sum16)~sum; |
1da177e4 LT |
68 | } |
69 | ||
70 | #define _HAVE_ARCH_IPV6_CSUM | |
9be259aa AV |
71 | extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
72 | const struct in6_addr *daddr, | |
1e940829 | 73 | __u32 len, __u8 proto, __wsum sum); |
1da177e4 | 74 | #endif |