| /* | |
| * Licensed under the GPL | |
| */ | |
| #ifndef __UM_SYSDEP_CHECKSUM_H | |
| #define __UM_SYSDEP_CHECKSUM_H | |
| static inline __sum16 ip_compute_csum(const void *buff, int len) | |
| { | |
| return csum_fold (csum_partial(buff, len, 0)); | |
| } | |
| #define _HAVE_ARCH_IPV6_CSUM | |
| static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr, | |
| const struct in6_addr *daddr, | |
| __u32 len, __u8 proto, | |
| __wsum sum) | |
| { | |
| __asm__( | |
| "addl 0(%1), %0 ;\n" | |
| "adcl 4(%1), %0 ;\n" | |
| "adcl 8(%1), %0 ;\n" | |
| "adcl 12(%1), %0 ;\n" | |
| "adcl 0(%2), %0 ;\n" | |
| "adcl 4(%2), %0 ;\n" | |
| "adcl 8(%2), %0 ;\n" | |
| "adcl 12(%2), %0 ;\n" | |
| "adcl %3, %0 ;\n" | |
| "adcl %4, %0 ;\n" | |
| "adcl $0, %0 ;\n" | |
| : "=&r" (sum) | |
| : "r" (saddr), "r" (daddr), | |
| "r"(htonl(len)), "r"(htonl(proto)), "0"(sum)); | |
| return csum_fold(sum); | |
| } | |
| /* | |
| * Copy and checksum to user | |
| */ | |
| #define HAVE_CSUM_COPY_USER | |
| static __inline__ __wsum csum_and_copy_to_user(const void *src, | |
| void __user *dst, | |
| int len, __wsum sum, int *err_ptr) | |
| { | |
| if (access_ok(VERIFY_WRITE, dst, len)) { | |
| if (copy_to_user(dst, src, len)) { | |
| *err_ptr = -EFAULT; | |
| return (__force __wsum)-1; | |
| } | |
| return csum_partial(src, len, sum); | |
| } | |
| if (len) | |
| *err_ptr = -EFAULT; | |
| return (__force __wsum)-1; /* invalid checksum */ | |
| } | |
| #endif |