xref: /openbmc/linux/lib/net_utils.c (revision 3c6a73cc)
1  #include <linux/string.h>
2  #include <linux/if_ether.h>
3  #include <linux/ctype.h>
4  #include <linux/kernel.h>
5  
6  bool mac_pton(const char *s, u8 *mac)
7  {
8  	int i;
9  
10  	/* XX:XX:XX:XX:XX:XX */
11  	if (strlen(s) < 3 * ETH_ALEN - 1)
12  		return false;
13  
14  	/* Don't dirty result unless string is valid MAC. */
15  	for (i = 0; i < ETH_ALEN; i++) {
16  		if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1]))
17  			return false;
18  		if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')
19  			return false;
20  	}
21  	for (i = 0; i < ETH_ALEN; i++) {
22  		mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]);
23  	}
24  	return true;
25  }
26  EXPORT_SYMBOL(mac_pton);
27