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 */
13extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
14
15/*
16 * Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit
17 * checksum, already complemented
18 */
19extern __sum16 csum_tcpudp_magic (__be32 saddr, __be32 daddr,
20					     unsigned short len,
21					     unsigned short proto,
22					     __wsum sum);
23
24extern __wsum csum_tcpudp_nofold (__be32 saddr, __be32 daddr,
25					unsigned short len,
26					unsigned short proto,
27					__wsum sum);
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 */
41extern __wsum csum_partial(const void *buff, int len, __wsum sum);
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 */
49extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
50						 int len, __wsum sum,
51						 int *errp);
52
53extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
54					       int len, __wsum sum);
55
56/*
57 * This routine is used for miscellaneous IP-like checksums, mainly in
58 * icmp.c
59 */
60extern __sum16 ip_compute_csum(const void *buff, int len);
61
62/*
63 * Fold a partial checksum without adding pseudo headers.
64 */
65static inline __sum16 csum_fold(__wsum csum)
66{
67	u32 sum = (__force u32)csum;
68	sum = (sum & 0xffff) + (sum >> 16);
69	sum = (sum & 0xffff) + (sum >> 16);
70	return (__force __sum16)~sum;
71}
72
73#define _HAVE_ARCH_IPV6_CSUM	1
74struct in6_addr;
75extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
76	const struct in6_addr *daddr, __u32 len, unsigned short proto,
77	__wsum csum);
78
79#endif /* _ASM_IA64_CHECKSUM_H */
80