Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
4cd5773a AS |
2 | #include <linux/string.h> |
3 | #include <linux/if_ether.h> | |
4 | #include <linux/ctype.h> | |
5 | #include <linux/kernel.h> | |
6 | ||
a69f5edb | 7 | bool mac_pton(const char *s, u8 *mac) |
4cd5773a | 8 | { |
21780f89 | 9 | size_t maxlen = 3 * ETH_ALEN - 1; |
4cd5773a AS |
10 | int i; |
11 | ||
12 | /* XX:XX:XX:XX:XX:XX */ | |
21780f89 | 13 | if (strnlen(s, maxlen) < maxlen) |
a69f5edb | 14 | return false; |
4cd5773a AS |
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])) | |
a69f5edb | 19 | return false; |
4cd5773a | 20 | if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':') |
a69f5edb | 21 | return false; |
4cd5773a AS |
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 | } | |
a69f5edb | 26 | return true; |
4cd5773a AS |
27 | } |
28 | EXPORT_SYMBOL(mac_pton); |