1#include <linux/string.h>
 2#include <linux/if_ether.h>
 3#include <linux/ctype.h>
 4#include <linux/kernel.h>
 5
 6int 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 0;
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 0;
18		if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')
19			return 0;
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 1;
25}
26EXPORT_SYMBOL(mac_pton);

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