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/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);