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1da177e4 LT |
1 | #ifndef _ALPHA_CHECKSUM_H |
2 | #define _ALPHA_CHECKSUM_H | |
3 | ||
4 | #include <linux/in6.h> | |
5 | ||
6 | /* | |
7 | * This is a version of ip_compute_csum() optimized for IP headers, | |
8 | * which always checksum on 4 octet boundaries. | |
9 | */ | |
9be259aa | 10 | extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
1da177e4 LT |
11 | |
12 | /* | |
13 | * computes the checksum of the TCP/UDP pseudo-header | |
14 | * returns a 16-bit checksum, already complemented | |
15 | */ | |
9be259aa | 16 | extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
1da177e4 LT |
17 | unsigned short len, |
18 | unsigned short proto, | |
9be259aa | 19 | __wsum sum); |
1da177e4 | 20 | |
9be259aa | 21 | __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
1da177e4 | 22 | unsigned short len, unsigned short proto, |
9be259aa | 23 | __wsum sum); |
1da177e4 LT |
24 | |
25 | /* | |
26 | * computes the checksum of a memory block at buff, length len, | |
27 | * and adds in "sum" (32-bit) | |
28 | * | |
29 | * returns a 32-bit number suitable for feeding into itself | |
30 | * or csum_tcpudp_magic | |
31 | * | |
32 | * this function must be called with even lengths, except | |
33 | * for the last fragment, which may be odd | |
34 | * | |
35 | * it's best to have buff aligned on a 32-bit boundary | |
36 | */ | |
9be259aa | 37 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
1da177e4 LT |
38 | |
39 | /* | |
40 | * the same as csum_partial, but copies from src while it | |
41 | * checksums | |
42 | * | |
43 | * here even more important to align src and dst on a 32-bit (or even | |
44 | * better 64-bit) boundary | |
45 | */ | |
9be259aa | 46 | __wsum csum_partial_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, | |
73 | __u32 len, unsigned short proto, | |
74 | __wsum sum); | |
1da177e4 | 75 | #endif |