arch/c6x/lib/checksum.c

   1 /*
   2  *              This program is free software; you can redistribute it and/or
   3  *              modify it under the terms of the GNU General Public License
   4  *              as published by the Free Software Foundation; either version
   5  *              2 of the License, or (at your option) any later version.
   6  */
   7 #include <linux/module.h>
   8 #include <net/checksum.h>
   9
  10 #include <asm/byteorder.h>
  11
  12 /*
  13  * copy from fs while checksumming, otherwise like csum_partial
  14  */
  15 __wsum
  16 csum_partial_copy_from_user(const void __user *src, void *dst, int len,
  17                             __wsum sum, int *csum_err)
  18 {
  19         int missing;
  20
  21         missing = __copy_from_user(dst, src, len);
  22         if (missing) {
  23                 memset(dst + len - missing, 0, missing);
  24                 *csum_err = -EFAULT;
  25         } else
  26                 *csum_err = 0;
  27
  28         return csum_partial(dst, len, sum);
  29 }
  30 EXPORT_SYMBOL(csum_partial_copy_from_user);
  31
  32 /* These are from csum_64plus.S */
  33 EXPORT_SYMBOL(csum_partial);
  34 EXPORT_SYMBOL(csum_partial_copy);
  35 EXPORT_SYMBOL(ip_compute_csum);
  36 EXPORT_SYMBOL(ip_fast_csum);