1/* $NetBSD: ether.c,v 1.11 1997/07/07 15:52:50 drochner Exp $ */
2
3/*
4 * Copyright (c) 1992 Regents of the University of California.
5 * All rights reserved.
6 *
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Lawrence Berkeley Laboratory and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL)
40 */
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: head/lib/libstand/ether.c 92913 2002-03-21 23:39:28Z obrien $");
44
45#include <sys/param.h>
46#include <sys/socket.h>
47#include <string.h>
48
49#include <net/if.h>
50#include <netinet/in.h>
51#include <netinet/if_ether.h>
52#include <netinet/in_systm.h>
53#include <netinet/ip.h>
54
55#include "stand.h"
56#include "net.h"
57#include "netif.h"
58
59/* Caller must leave room for ethernet header in front!! */
60ssize_t
61sendether(d, pkt, len, dea, etype)
62 struct iodesc *d;
63 void *pkt;
64 size_t len;
65 u_char *dea;
66 int etype;
67{
68 ssize_t n;
69 struct ether_header *eh;
70
71#ifdef ETHER_DEBUG
72 if (debug)
73 printf("sendether: called\n");
74#endif
75
76 eh = (struct ether_header *)pkt - 1;
77 len += sizeof(*eh);
78
79 MACPY(d->myea, eh->ether_shost); /* by byte */
80 MACPY(dea, eh->ether_dhost); /* by byte */
81 eh->ether_type = htons(etype);
82
83 n = netif_put(d, eh, len);
84 if (n == -1 || n < sizeof(*eh))
85 return (-1);
86
87 n -= sizeof(*eh);
88 return (n);
89}
90
91/*
92 * Get a packet of any Ethernet type, with our address or
93 * the broadcast address. Save the Ether type in arg 5.
94 * NOTE: Caller must leave room for the Ether header.
95 */
96ssize_t
97readether(d, pkt, len, tleft, etype)
98 struct iodesc *d;
99 void *pkt;
100 size_t len;
101 time_t tleft;
102 u_int16_t *etype;
103{
104 ssize_t n;
105 struct ether_header *eh;
106
107#ifdef ETHER_DEBUG
108 if (debug)
109 printf("readether: called\n");
110#endif
111
112 eh = (struct ether_header *)pkt - 1;
113 len += sizeof(*eh);
114
115 n = netif_get(d, eh, len, tleft);
116 if (n == -1 || n < sizeof(*eh))
117 return (-1);
118
119 /* Validate Ethernet address. */
120 if (bcmp(d->myea, eh->ether_dhost, 6) != 0 &&
121 bcmp(bcea, eh->ether_dhost, 6) != 0) {
122#ifdef ETHER_DEBUG
123 if (debug)
124 printf("readether: not ours (ea=%s)\n",
125 ether_sprintf(eh->ether_dhost));
126#endif
127 return (-1);
128 }
129 *etype = ntohs(eh->ether_type);
130
131 n -= sizeof(*eh);
132 return (n);
133}
134
135/*
136 * Convert Ethernet address to printable (loggable) representation.
137 */
138static char digits[] = "0123456789abcdef";
139char *
140ether_sprintf(ap)
141 u_char *ap;
142{
143 int i;
144 static char etherbuf[18];
145 char *cp = etherbuf;
146
147 for (i = 0; i < 6; i++) {
148 *cp++ = digits[*ap >> 4];
149 *cp++ = digits[*ap++ & 0xf];
150 *cp++ = ':';
151 }
152 *--cp = 0;
153 return (etherbuf);
154}