lib/net_utils.c

   1 #include <linux/string.h>
   2 #include <linux/if_ether.h>
   3 #include <linux/ctype.h>
   4 #include <linux/kernel.h>
   5
   6 bool mac_pton(const char *s, u8 *mac)
   7 {
   8         int i;
   9
  10         /* XX:XX:XX:XX:XX:XX */
  11         if (strlen(s) < 3 * ETH_ALEN - 1)
  12                 return false;
  13
  14         /* Don't dirty result unless string is valid MAC. */
  15         for (i = 0; i < ETH_ALEN; i++) {
  16                 if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1]))
  17                         return false;
  18                 if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')
  19                         return false;
  20         }
  21         for (i = 0; i < ETH_ALEN; i++) {
  22                 mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]);
  23         }
  24         return true;
  25 }
  26 EXPORT_SYMBOL(mac_pton);