xref: /illumos-gate/usr/src/uts/common/io/etheraddr.c (revision 2d6eb4a5e0a47d30189497241345dc5466bb68ab)
1 /*
2  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
3  * Use is subject to license terms.
4  */
5 
6 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
7 /*	  All Rights Reserved  	*/
8 
9 /*
10  * Copyright (c) 1982, 1986 Regents of the University of California.
11  * All rights reserved.
12  *
13  * Redistribution and use in source and binary forms are permitted
14  * provided that this notice is preserved and that due credit is given
15  * to the University of California at Berkeley. The name of the University
16  * may not be used to endorse or promote products derived from this
17  * software without specific prior written permission.  This software
18  * is provided ``as is'' without express or implied warranty.
19  */
20 
21 #include <sys/types.h>
22 #include <sys/sysmacros.h>
23 #include <sys/ethernet.h>
24 #include <sys/cmn_err.h>
25 #include <sys/ksynch.h>
26 
27 /*
28  * Store and retrieve local individual ethernet address.
29  * This is typically initialized (called with 'hint' nonnull)
30  * by the boot code.
31  */
32 
33 static kmutex_t localetheraddr_lock;   /* Perimeter lock for localetheraddr */
34 
35 int
localetheraddr(struct ether_addr * hint,struct ether_addr * result)36 localetheraddr(struct ether_addr *hint, struct ether_addr *result)
37 {
38 	static int found = 0;
39 	static	struct	ether_addr	addr;
40 
41 	mutex_enter(&localetheraddr_lock);
42 	if (!found) {
43 		if (hint == NULL) {
44 			mutex_exit(&localetheraddr_lock);
45 			return (0);
46 		}
47 		found = 1;
48 		addr = *hint;
49 		cmn_err(CE_CONT, "?Ethernet address = %s\n",
50 		    ether_sprintf(&addr));
51 	}
52 	if (result != NULL)
53 		*result = addr;
54 	mutex_exit(&localetheraddr_lock);
55 	return (1);
56 }
57 
58 /*
59  * Convert Ethernet address to printable (loggable) representation.
60  *
61  * XXX This is not MT-safe, but its only race is for the "etherbuf".
62  */
63 char *
ether_sprintf(struct ether_addr * addr)64 ether_sprintf(struct ether_addr *addr)
65 {
66 	static char etherbuf[18];
67 
68 	(void) snprintf(etherbuf, sizeof (etherbuf), "%x:%x:%x:%x:%x:%x",
69 	    addr->ether_addr_octet[0], addr->ether_addr_octet[1],
70 	    addr->ether_addr_octet[2], addr->ether_addr_octet[3],
71 	    addr->ether_addr_octet[4], addr->ether_addr_octet[5]);
72 	return (etherbuf);
73 }
74 
75 static int
hexval(char dig)76 hexval(char dig)
77 {
78 	if ('0' <= dig && dig <= '9') {
79 		return (dig - '0');
80 	} else if ('a' <= dig && dig <= 'f') {
81 		return (dig - 'a' + 10);
82 	} else if ('A' <= dig && dig <= 'F') {
83 		return (dig - 'A' + 10);
84 	} else {
85 		return (-1);
86 	}
87 }
88 
89 /*
90  * Convert Ethernet address from ascii to binary form.
91  * Return number of bytes written.
92  */
93 int
ether_aton(char * addr,uchar_t * macaddr)94 ether_aton(char *addr, uchar_t *macaddr)
95 {
96 	int i = 0;
97 	uint_t val = 0;
98 	char *cp = addr;
99 
100 	while (*cp != 0 && i < 6) {
101 		if (*cp == ':') {
102 			macaddr[i++] = val;
103 			val = 0;
104 			cp++;
105 			continue;
106 		}
107 
108 		val = (val << 4) | hexval(*cp++);
109 	}
110 	macaddr[i] = val;
111 	return (i + 1);
112 }
113