1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _ASM_IA64_CHECKSUM_H
3*4882a593Smuzhiyun #define _ASM_IA64_CHECKSUM_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun /*
6*4882a593Smuzhiyun * Modified 1998, 1999
7*4882a593Smuzhiyun * David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun /*
11*4882a593Smuzhiyun * This is a version of ip_compute_csum() optimized for IP headers,
12*4882a593Smuzhiyun * which always checksum on 4 octet boundaries.
13*4882a593Smuzhiyun */
14*4882a593Smuzhiyun extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun /*
17*4882a593Smuzhiyun * Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit
18*4882a593Smuzhiyun * checksum, already complemented
19*4882a593Smuzhiyun */
20*4882a593Smuzhiyun extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
21*4882a593Smuzhiyun __u32 len, __u8 proto, __wsum sum);
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun extern __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
24*4882a593Smuzhiyun __u32 len, __u8 proto, __wsum sum);
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun /*
27*4882a593Smuzhiyun * Computes the checksum of a memory block at buff, length len,
28*4882a593Smuzhiyun * and adds in "sum" (32-bit)
29*4882a593Smuzhiyun *
30*4882a593Smuzhiyun * returns a 32-bit number suitable for feeding into itself
31*4882a593Smuzhiyun * or csum_tcpudp_magic
32*4882a593Smuzhiyun *
33*4882a593Smuzhiyun * this function must be called with even lengths, except
34*4882a593Smuzhiyun * for the last fragment, which may be odd
35*4882a593Smuzhiyun *
36*4882a593Smuzhiyun * it's best to have buff aligned on a 32-bit boundary
37*4882a593Smuzhiyun */
38*4882a593Smuzhiyun extern __wsum csum_partial(const void *buff, int len, __wsum sum);
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun /*
41*4882a593Smuzhiyun * This routine is used for miscellaneous IP-like checksums, mainly in
42*4882a593Smuzhiyun * icmp.c
43*4882a593Smuzhiyun */
44*4882a593Smuzhiyun extern __sum16 ip_compute_csum(const void *buff, int len);
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun /*
47*4882a593Smuzhiyun * Fold a partial checksum without adding pseudo headers.
48*4882a593Smuzhiyun */
csum_fold(__wsum csum)49*4882a593Smuzhiyun static inline __sum16 csum_fold(__wsum csum)
50*4882a593Smuzhiyun {
51*4882a593Smuzhiyun u32 sum = (__force u32)csum;
52*4882a593Smuzhiyun sum = (sum & 0xffff) + (sum >> 16);
53*4882a593Smuzhiyun sum = (sum & 0xffff) + (sum >> 16);
54*4882a593Smuzhiyun return (__force __sum16)~sum;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun #define _HAVE_ARCH_IPV6_CSUM 1
58*4882a593Smuzhiyun struct in6_addr;
59*4882a593Smuzhiyun extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
60*4882a593Smuzhiyun const struct in6_addr *daddr,
61*4882a593Smuzhiyun __u32 len, __u8 proto, __wsum csum);
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun #endif /* _ASM_IA64_CHECKSUM_H */
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