1 /* $OpenBSD: ether.c,v 1.7 2003/08/11 06:23:09 deraadt Exp $ */
2 /* $NetBSD: ether.c,v 1.8 1996/10/13 02:29:00 christos Exp $ */
3
4 /*
5 * Copyright (c) 1992 Regents of the University of California.
6 * All rights reserved.
7 *
8 * This software was developed by the Computer Systems Engineering group
9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
10 * contributed to Berkeley.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Lawrence Berkeley Laboratory and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL)
41 */
42
43 #include <sys/param.h>
44 #include <sys/socket.h>
45
46 #include <net/if.h>
47
48 #include <netinet/in.h>
49 #include <netinet/if_ether.h>
50 #include <netinet/in_systm.h>
51 #include <netinet/ip.h>
52
53 #include "stand.h"
54 #include "net.h"
55 #include "netif.h"
56
57 /* Caller must leave room for ethernet header in front!! */
58 ssize_t
59 sendether(d, pkt, len, dea, etype)
60 struct iodesc *d;
61 void *pkt;
62 size_t len;
63 u_char *dea;
64 int etype;
65 {
66 ssize_t n;
67 struct ether_header *eh;
68
69 #ifdef ETHER_DEBUG
70 if (debug)
71 printf("sendether: called\n");
72 #endif
73
74 eh = (struct ether_header *)pkt - 1;
75 len += sizeof(*eh);
76
77 MACPY(d->myea, eh->ether_shost); /* by byte */
78 MACPY(dea, eh->ether_dhost); /* by byte */
79 eh->ether_type = htons(etype);
80
81 n = netif_put(d, eh, len);
82 if (n < 0 || (size_t)n < sizeof(*eh))
83 return (-1);
84
85 n -= sizeof(*eh);
86 return (n);
87 }
88
89 /*
90 * Get a packet of any Ethernet type, with our address or
91 * the broadcast address. Save the Ether type in arg 5.
92 * NOTE: Caller must leave room for the Ether header.
93 */
94 ssize_t
95 readether(d, pkt, len, tleft, etype)
96 struct iodesc *d;
97 void *pkt;
98 size_t len;
99 time_t tleft;
100 u_int16_t *etype;
101 {
102 ssize_t n;
103 struct ether_header *eh;
104
105 #ifdef ETHER_DEBUG
106 if (debug)
107 printf("readether: called\n");
108 #endif
109
110 eh = (struct ether_header *)pkt - 1;
111 len += sizeof(*eh);
112
113 n = netif_get(d, eh, len, tleft);
114 if (n < 0 || (size_t)n < sizeof(*eh))
115 return (-1);
116
117 /* Validate Ethernet address. */
118 if (bcmp(d->myea, eh->ether_dhost, 6) != 0 &&
119 bcmp(bcea, eh->ether_dhost, 6) != 0) {
120 #ifdef ETHER_DEBUG
121 if (debug)
122 printf("readether: not ours (ea=%s)\n",
123 ether_sprintf(eh->ether_dhost));
124 #endif
125 return (-1);
126 }
127 *etype = ntohs(eh->ether_type);
128
129 n -= sizeof(*eh);
130 return (n);
131 }
132
133 /*
134 * Convert Ethernet address to printable (loggable) representation.
135 */
136 static char digits[] = "0123456789abcdef";
137 char *
138 ether_sprintf(u_char *ap)
139 {
140 int i;
141 static char etherbuf[18];
142 char *cp = etherbuf;
143
144 for (i = 0; i < 6; i++) {
145 *cp++ = digits[*ap >> 4];
146 *cp++ = digits[*ap++ & 0xf];
147 *cp++ = ':';
148 }
149 *--cp = 0;
150 return (etherbuf);
151 }