arch/x86_64/lib/old-checksum.c

   1 /*
   2  * Temporal C versions of the checksum functions until optimized assembler versions
   3  * can go in.
   4  */
   5
   6 #include <net/checksum.h>
   7
   8 /*
   9  * Copy from userspace and compute checksum.  If we catch an exception
  10  * then zero the rest of the buffer.
  11  */
  12 unsigned int csum_partial_copy_from_user (const char *src, char *dst,
  13                                           int len, unsigned int sum,
  14                                           int *err_ptr)
  15 {
  16         int missing;
  17
  18         missing = copy_from_user(dst, src, len);
  19         if (missing) {
  20                 memset(dst + len - missing, 0, missing);
  21                 *err_ptr = -EFAULT;
  22         }
  23
  24         return csum_partial(dst, len, sum);
  25 }
  26
  27 unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len, unsigned int sum)
  28 {
  29         memcpy(dst,src,len);
  30         return csum_partial(dst,len,sum);
  31 }
  32
  33 /* Fallback for csum_and_copy_to_user is currently in include/net/checksum.h */