1 #ifndef _ASM_IA64_CHECKSUM_H
2 #define _ASM_IA64_CHECKSUM_H
3
4 /*
5 * Modified 1998, 1999
6 * David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
7 */
8
9 /*
10 * This is a version of ip_compute_csum() optimized for IP headers,
11 * which always checksum on 4 octet boundaries.
12 */
13 extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
14
15 /*
16 * Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit
17 * checksum, already complemented
18 */
19 extern __sum16 csum_tcpudp_magic (__be32 saddr, __be32 daddr,
20 unsigned short len,
21 unsigned short proto,
22 __wsum sum);
23
24 extern __wsum csum_tcpudp_nofold (__be32 saddr, __be32 daddr,
25 unsigned short len,
26 unsigned short proto,
27 __wsum sum);
28
29 /*
30 * Computes the checksum of a memory block at buff, length len,
31 * and adds in "sum" (32-bit)
32 *
33 * returns a 32-bit number suitable for feeding into itself
34 * or csum_tcpudp_magic
35 *
36 * this function must be called with even lengths, except
37 * for the last fragment, which may be odd
38 *
39 * it's best to have buff aligned on a 32-bit boundary
40 */
41 extern __wsum csum_partial(const void *buff, int len, __wsum sum);
42
43 /*
44 * Same as csum_partial, but copies from src while it checksums.
45 *
46 * Here it is even more important to align src and dst on a 32-bit (or
47 * even better 64-bit) boundary.
48 */
49 extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
50 int len, __wsum sum,
51 int *errp);
52
53 extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
54 int len, __wsum sum);
55
56 /*
57 * This routine is used for miscellaneous IP-like checksums, mainly in
58 * icmp.c
59 */
60 extern __sum16 ip_compute_csum(const void *buff, int len);
61
62 /*
63 * Fold a partial checksum without adding pseudo headers.
64 */
csum_fold(__wsum csum)65 static inline __sum16 csum_fold(__wsum csum)
66 {
67 u32 sum = (__force u32)csum;
68 sum = (sum & 0xffff) + (sum >> 16);
69 sum = (sum & 0xffff) + (sum >> 16);
70 return (__force __sum16)~sum;
71 }
72
73 #define _HAVE_ARCH_IPV6_CSUM 1
74 struct in6_addr;
75 extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
76 const struct in6_addr *daddr, __u32 len, unsigned short proto,
77 __wsum csum);
78
79 #endif /* _ASM_IA64_CHECKSUM_H */
80