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 */
16extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
17					   unsigned short len,
18					   unsigned short proto,
19					   __wsum sum);
20
21__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
22				unsigned short len, unsigned short proto,
23				__wsum sum);
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 */
37extern __wsum csum_partial(const void *buff, int len, __wsum sum);
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 */
46__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp);
 
47
48__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);
49
50
51/*
52 * this routine is used for miscellaneous IP-like checksums, mainly
53 * in icmp.c
54 */
55
56extern __sum16 ip_compute_csum(const void *buff, int len);
57
58/*
59 *	Fold a partial checksum without adding pseudo headers
60 */
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
71extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
72			       const struct in6_addr *daddr,
73			       __u32 len, unsigned short proto,
74			       __wsum sum);
75#endif

 1/* SPDX-License-Identifier: GPL-2.0 */
 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 */
11extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
12
13/*
14 * computes the checksum of the TCP/UDP pseudo-header
15 * returns a 16-bit checksum, already complemented
16 */
17__sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
18			  __u32 len, __u8 proto, __wsum sum);
 
 
19
20__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
21			  __u32 len, __u8 proto, __wsum sum);
 
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 */
35extern __wsum csum_partial(const void *buff, int len, __wsum sum);
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 */
44#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
45__wsum csum_and_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp);
46
47__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);
48
49
50/*
51 * this routine is used for miscellaneous IP-like checksums, mainly
52 * in icmp.c
53 */
54
55extern __sum16 ip_compute_csum(const void *buff, int len);
56
57/*
58 *	Fold a partial checksum without adding pseudo headers
59 */
60
61static inline __sum16 csum_fold(__wsum csum)
62{
63	u32 sum = (__force u32)csum;
64	sum = (sum & 0xffff) + (sum >> 16);
65	sum = (sum & 0xffff) + (sum >> 16);
66	return (__force __sum16)~sum;
67}
68
69#define _HAVE_ARCH_IPV6_CSUM
70extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
71			       const struct in6_addr *daddr,
72			       __u32 len, __u8 proto, __wsum sum);
 
73#endif