// 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) { int i; /* XX:XX:XX:XX:XX:XX */ if (strlen(s) < 3 * ETH_ALEN - 1) 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);