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 int i; 10 11 /* XX:XX:XX:XX:XX:XX */ 12 if (strlen(s) < 3 * ETH_ALEN - 1) 13 return false; 14 15 /* Don't dirty result unless string is valid MAC. */ 16 for (i = 0; i < ETH_ALEN; i++) { 17 if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1])) 18 return false; 19 if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':') 20 return false; 21 } 22 for (i = 0; i < ETH_ALEN; i++) { 23 mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]); 24 } 25 return true; 26 } 27 EXPORT_SYMBOL(mac_pton); 28