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