1// SPDX-License-Identifier: GPL-2.0
2#include <linux/string.h>
3#include <linux/if_ether.h>
4#include <linux/ctype.h>
5#include <linux/export.h>
6#include <linux/hex.h>
7
8bool mac_pton(const char *s, u8 *mac)
9{
10	size_t maxlen = 3 * ETH_ALEN - 1;
11	int i;
12
13	/* XX:XX:XX:XX:XX:XX */
14	if (strnlen(s, maxlen) < maxlen)
15		return false;
16
17	/* Don't dirty result unless string is valid MAC. */
18	for (i = 0; i < ETH_ALEN; i++) {
19		if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1]))
20			return false;
21		if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')
22			return false;
23	}
24	for (i = 0; i < ETH_ALEN; i++) {
25		mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]);
26	}
27	return true;
28}
29EXPORT_SYMBOL(mac_pton);
30