#include <linux/string.h>
  #include <linux/if_ether.h>
  #include <linux/ctype.h>
  #include <linux/kernel.h>

  bool mac_pton(const char *s, u8 *mac)

  {
  	int i;
  
  	/* XX:XX:XX:XX:XX:XX */
  	if (strlen(s) < 3 * ETH_ALEN - 1)

  		return false;

  
  	/* Don't dirty result unless string is valid MAC. */
  	for (i = 0; i < ETH_ALEN; i++) {
  		if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1]))

  			return false;

  		if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')

  			return false;

  	}
  	for (i = 0; i < ETH_ALEN; i++) {
  		mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]);
  	}

  	return true;

  }
  EXPORT_SYMBOL(mac_pton);