1 #ifndef _ASM_IA64_CHECKSUM_H
2 #define _ASM_IA64_CHECKSUM_H
6 * David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
10 * This is a version of ip_compute_csum() optimized for IP headers,
11 * which always checksum on 4 octet boundaries.
13 extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
16 * Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit
17 * checksum, already complemented
19 extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
20 __u32 len, __u8 proto, __wsum sum);
22 extern __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
23 __u32 len, __u8 proto, __wsum sum);
26 * Computes the checksum of a memory block at buff, length len,
27 * and adds in "sum" (32-bit)
29 * returns a 32-bit number suitable for feeding into itself
30 * or csum_tcpudp_magic
32 * this function must be called with even lengths, except
33 * for the last fragment, which may be odd
35 * it's best to have buff aligned on a 32-bit boundary
37 extern __wsum csum_partial(const void *buff, int len, __wsum sum);
40 * Same as csum_partial, but copies from src while it checksums.
42 * Here it is even more important to align src and dst on a 32-bit (or
43 * even better 64-bit) boundary.
45 extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
49 extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
53 * This routine is used for miscellaneous IP-like checksums, mainly in
56 extern __sum16 ip_compute_csum(const void *buff, int len);
59 * Fold a partial checksum without adding pseudo headers.
61 static inline __sum16 csum_fold(__wsum csum)
63 u32 sum = (__force u32)csum;
64 sum = (sum & 0xffff) + (sum >> 16);
65 sum = (sum & 0xffff) + (sum >> 16);
66 return (__force __sum16)~sum;
69 #define _HAVE_ARCH_IPV6_CSUM 1
71 extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
72 const struct in6_addr *daddr,
73 __u32 len, __u8 proto, __wsum csum);
75 #endif /* _ASM_IA64_CHECKSUM_H */