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 */
11 extern __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 */
35 extern __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 #define _HAVE_ARCH_CSUM_AND_COPY
46 __wsum csum_and_copy_from_user(const void __user *src, void *dst, int len);
47
48 __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len);
49
50
51 /*
52 * this routine is used for miscellaneous IP-like checksums, mainly
53 * in icmp.c
54 */
55
56 extern __sum16 ip_compute_csum(const void *buff, int len);
57
58 /*
59 * Fold a partial checksum without adding pseudo headers
60 */
61
62 static 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
71 extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
72 const struct in6_addr *daddr,
73 __u32 len, __u8 proto, __wsum sum);
74 #endif
75
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