net_utils.c

 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	int i;
11
12	if (strnlen(s, MAC_ADDR_STR_LEN) < MAC_ADDR_STR_LEN)
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);