// SPDX-License-Identifier: GPL-2.0#include <linux/string.h>#include <linux/if_ether.h>#include <linux/ctype.h>#include <linux/export.h>#include <linux/hex.h> bool mac_pton(const char *s, u8 *mac){	int i; 	if (strnlen(s, MAC_ADDR_STR_LEN) < MAC_ADDR_STR_LEN)		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);