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/export.h> 6 #include <linux/hex.h> 7 8 bool mac_pton(const char *s, u8 *mac) 9 { 10 size_t maxlen = 3 * ETH_ALEN - 1; 11 int i; 12 13 /* XX:XX:XX:XX:XX:XX */ 14 if (strnlen(s, maxlen) < maxlen) 15 return false; 16 17 /* Don't dirty result unless string is valid MAC. */ 18 for (i = 0; i < ETH_ALEN; i++) { 19 if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1])) 20 return false; 21 if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':') 22 return false; 23 } 24 for (i = 0; i < ETH_ALEN; i++) { 25 mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]); 26 } 27 return true; 28 } 29 EXPORT_SYMBOL(mac_pton); 30