1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */
2024b246eSLinus Torvalds #ifndef _ALPHA_CHECKSUM_H
3024b246eSLinus Torvalds #define _ALPHA_CHECKSUM_H
4024b246eSLinus Torvalds
5024b246eSLinus Torvalds #include <linux/in6.h>
6024b246eSLinus Torvalds
7024b246eSLinus Torvalds /*
8024b246eSLinus Torvalds * This is a version of ip_compute_csum() optimized for IP headers,
9024b246eSLinus Torvalds * which always checksum on 4 octet boundaries.
10024b246eSLinus Torvalds */
11024b246eSLinus Torvalds extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
12024b246eSLinus Torvalds
13024b246eSLinus Torvalds /*
14024b246eSLinus Torvalds * computes the checksum of the TCP/UDP pseudo-header
15024b246eSLinus Torvalds * returns a 16-bit checksum, already complemented
16024b246eSLinus Torvalds */
1701cfbad7SAlexander Duyck __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
1801cfbad7SAlexander Duyck __u32 len, __u8 proto, __wsum sum);
19024b246eSLinus Torvalds
20024b246eSLinus Torvalds __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
2101cfbad7SAlexander Duyck __u32 len, __u8 proto, __wsum sum);
22024b246eSLinus Torvalds
23024b246eSLinus Torvalds /*
24024b246eSLinus Torvalds * computes the checksum of a memory block at buff, length len,
25024b246eSLinus Torvalds * and adds in "sum" (32-bit)
26024b246eSLinus Torvalds *
27024b246eSLinus Torvalds * returns a 32-bit number suitable for feeding into itself
28024b246eSLinus Torvalds * or csum_tcpudp_magic
29024b246eSLinus Torvalds *
30024b246eSLinus Torvalds * this function must be called with even lengths, except
31024b246eSLinus Torvalds * for the last fragment, which may be odd
32024b246eSLinus Torvalds *
33024b246eSLinus Torvalds * it's best to have buff aligned on a 32-bit boundary
34024b246eSLinus Torvalds */
35024b246eSLinus Torvalds extern __wsum csum_partial(const void *buff, int len, __wsum sum);
36024b246eSLinus Torvalds
37024b246eSLinus Torvalds /*
38024b246eSLinus Torvalds * the same as csum_partial, but copies from src while it
39024b246eSLinus Torvalds * checksums
40024b246eSLinus Torvalds *
41024b246eSLinus Torvalds * here even more important to align src and dst on a 32-bit (or even
42024b246eSLinus Torvalds * better 64-bit) boundary
43024b246eSLinus Torvalds */
44808b49daSAl Viro #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
456e41c585SAl Viro #define _HAVE_ARCH_CSUM_AND_COPY
46c693cc46SAl Viro __wsum csum_and_copy_from_user(const void __user *src, void *dst, int len);
47024b246eSLinus Torvalds
48cc44c17bSAl Viro __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len);
49024b246eSLinus Torvalds
50024b246eSLinus Torvalds
51024b246eSLinus Torvalds /*
52024b246eSLinus Torvalds * this routine is used for miscellaneous IP-like checksums, mainly
53024b246eSLinus Torvalds * in icmp.c
54024b246eSLinus Torvalds */
55024b246eSLinus Torvalds
56024b246eSLinus Torvalds extern __sum16 ip_compute_csum(const void *buff, int len);
57024b246eSLinus Torvalds
58024b246eSLinus Torvalds /*
59024b246eSLinus Torvalds * Fold a partial checksum without adding pseudo headers
60024b246eSLinus Torvalds */
61024b246eSLinus Torvalds
csum_fold(__wsum csum)62024b246eSLinus Torvalds static inline __sum16 csum_fold(__wsum csum)
63024b246eSLinus Torvalds {
64024b246eSLinus Torvalds u32 sum = (__force u32)csum;
65024b246eSLinus Torvalds sum = (sum & 0xffff) + (sum >> 16);
66024b246eSLinus Torvalds sum = (sum & 0xffff) + (sum >> 16);
67024b246eSLinus Torvalds return (__force __sum16)~sum;
68024b246eSLinus Torvalds }
69024b246eSLinus Torvalds
70024b246eSLinus Torvalds #define _HAVE_ARCH_IPV6_CSUM
71024b246eSLinus Torvalds extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
72024b246eSLinus Torvalds const struct in6_addr *daddr,
731e940829SAlexander Duyck __u32 len, __u8 proto, __wsum sum);
74024b246eSLinus Torvalds #endif
75