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
8 bool 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 }
29 EXPORT_SYMBOL(mac_pton);
30
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