1/* SPDX-License-Identifier: GPL-2.0 */
 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 */
14extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
15
16/*
17 * Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit
18 * checksum, already complemented
19 */
20extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
21				 __u32 len, __u8 proto, __wsum sum);
22
23extern __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
24				 __u32 len, __u8 proto, __wsum sum);
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 */
38extern __wsum csum_partial(const void *buff, int len, __wsum sum);
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 */
46extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
47						 int len, __wsum sum,
48						 int *errp);
49
50extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
51					       int len, __wsum sum);
52
53/*
54 * This routine is used for miscellaneous IP-like checksums, mainly in
55 * icmp.c
56 */
57extern __sum16 ip_compute_csum(const void *buff, int len);
58
59/*
60 * Fold a partial checksum without adding pseudo headers.
61 */
62static inline __sum16 csum_fold(__wsum csum)
63{
64	u32 sum = (__force u32)csum;
65	sum = (sum & 0xffff) + (sum >> 16);
66	sum = (sum & 0xffff) + (sum >> 16);
67	return (__force __sum16)~sum;
68}
69
70#define _HAVE_ARCH_IPV6_CSUM	1
71struct in6_addr;
72extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
73			       const struct in6_addr *daddr,
74			       __u32 len, __u8 proto, __wsum csum);
75
76#endif /* _ASM_IA64_CHECKSUM_H */