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	int i;
10
11	/* XX:XX:XX:XX:XX:XX */
12	if (strlen(s) < 3 * ETH_ALEN - 1)
13		return false;
14
15	/* Don't dirty result unless string is valid MAC. */
16	for (i = 0; i < ETH_ALEN; i++) {
17		if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1]))
18			return false;
19		if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')
20			return false;
21	}
22	for (i = 0; i < ETH_ALEN; i++) {
23		mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]);
24	}
25	return true;
26}
27EXPORT_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);