2 * Licensed under the GPL
5 #ifndef __UM_SYSDEP_CHECKSUM_H
6 #define __UM_SYSDEP_CHECKSUM_H
8 static inline __sum16 ip_compute_csum(const void *buff, int len)
10 return csum_fold (csum_partial(buff, len, 0));
13 #define _HAVE_ARCH_IPV6_CSUM
14 static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
15 const struct in6_addr *daddr,
16 __u32 len, __u8 proto,
32 : "r" (saddr), "r" (daddr),
33 "r"(htonl(len)), "r"(htonl(proto)), "0"(sum));
35 return csum_fold(sum);
39 * Copy and checksum to user
41 #define HAVE_CSUM_COPY_USER
42 static __inline__ __wsum csum_and_copy_to_user(const void *src,
44 int len, __wsum sum, int *err_ptr)
46 if (access_ok(dst, len)) {
47 if (copy_to_user(dst, src, len)) {
49 return (__force __wsum)-1;
52 return csum_partial(src, len, sum);
58 return (__force __wsum)-1; /* invalid checksum */