| /* |
| * 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 |
