| // SPDX-License-Identifier: GPL-2.0 |
| #include <linux/string.h> |
| #include <linux/if_ether.h> |
| #include <linux/ctype.h> |
| #include <linux/kernel.h> |
| |
| bool mac_pton(const char *s, u8 *mac) |
| { |
| size_t maxlen = 3 * ETH_ALEN - 1; |
| int i; |
| |
| /* XX:XX:XX:XX:XX:XX */ |
| if (strnlen(s, maxlen) < maxlen) |
| return false; |
| |
| /* Don't dirty result unless string is valid MAC. */ |
| for (i = 0; i < ETH_ALEN; i++) { |
| if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1])) |
| return false; |
| if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':') |
| return false; |
| } |
| for (i = 0; i < ETH_ALEN; i++) { |
| mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]); |
| } |
| return true; |
| } |
| EXPORT_SYMBOL(mac_pton); |
