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Linux kernel mirror (for testing)
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kernel
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linux
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 */
10extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
11
12/*
13 * computes the checksum of the TCP/UDP pseudo-header
14 * returns a 16-bit checksum, already complemented
15 */
16__sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
17 __u32 len, __u8 proto, __wsum sum);
18
19__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
20 __u32 len, __u8 proto, __wsum sum);
21
22/*
23 * computes the checksum of a memory block at buff, length len,
24 * and adds in "sum" (32-bit)
25 *
26 * returns a 32-bit number suitable for feeding into itself
27 * or csum_tcpudp_magic
28 *
29 * this function must be called with even lengths, except
30 * for the last fragment, which may be odd
31 *
32 * it's best to have buff aligned on a 32-bit boundary
33 */
34extern __wsum csum_partial(const void *buff, int len, __wsum sum);
35
36/*
37 * the same as csum_partial, but copies from src while it
38 * checksums
39 *
40 * here even more important to align src and dst on a 32-bit (or even
41 * better 64-bit) boundary
42 */
43__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp);
44
45__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);
46
47
48/*
49 * this routine is used for miscellaneous IP-like checksums, mainly
50 * in icmp.c
51 */
52
53extern __sum16 ip_compute_csum(const void *buff, int len);
54
55/*
56 * Fold a partial checksum without adding pseudo headers
57 */
58
59static inline __sum16 csum_fold(__wsum csum)
60{
61 u32 sum = (__force u32)csum;
62 sum = (sum & 0xffff) + (sum >> 16);
63 sum = (sum & 0xffff) + (sum >> 16);
64 return (__force __sum16)~sum;
65}
66
67#define _HAVE_ARCH_IPV6_CSUM
68extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
69 const struct in6_addr *daddr,
70 __u32 len, __u8 proto, __wsum sum);
71#endif