1 | // SPDX-License-Identifier: GPL-2.0 |
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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(p: 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(ch: s[i * 3]) << 4) | hex_to_bin(ch: s[i * 3 + 1]); |
26 | } |
27 | return true; |
28 | } |
29 | EXPORT_SYMBOL(mac_pton); |
30 |