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/kernel.h> 6 7 bool mac_pton(const char *s, u8 *mac) 8 { 9 size_t maxlen = 3 * ETH_ALEN - 1; 10 int i; 11 12 /* XX:XX:XX:XX:XX:XX */ 13 if (strnlen(s, maxlen) < maxlen) 14 return false; 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])) 19 return false; 20 if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':') 21 return false; 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 } 26 return true; 27 } 28 EXPORT_SYMBOL(mac_pton); 29