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lib/net_utils.c 640 Bytes
81f7e3824   Eric Lee   Initial Release, ...
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  // SPDX-License-Identifier: GPL-2.0
  #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);