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: stable/11/stand/libsa/ether.c 329132 2018-02-11 19:51:29Z kevans $");
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(struct iodesc *d, void *pkt, size_t len, uint8_t *dea, int etype)
58{
59	ssize_t n;
60	struct ether_header *eh;
61
62#ifdef ETHER_DEBUG
63 	if (debug)
64		printf("sendether: called\n");
65#endif
66
67	eh = (struct ether_header *)pkt - 1;
68	len += sizeof(*eh);
69
70	MACPY(d->myea, eh->ether_shost);		/* by byte */
71	MACPY(dea, eh->ether_dhost);			/* by byte */
72	eh->ether_type = htons(etype);
73
74	n = netif_put(d, eh, len);
75	if (n == -1 || n < sizeof(*eh))
76		return (-1);
77
78	n -= sizeof(*eh);
79	return (n);
80}
81
82/*
83 * Get a packet of any Ethernet type, with our address or
84 * the broadcast address.  Save the Ether type in etype.
85 * Unless there is an error, we pass the whole packet and the unencapsulated
86 * data.
87 */
88ssize_t
89readether(struct iodesc *d, void **pkt, void **payload, time_t tleft,
90    uint16_t *etype)
91{
92	ssize_t n;
93	struct ether_header *eh;
94	void *ptr;
95
96#ifdef ETHER_DEBUG
97 	if (debug)
98		printf("readether: called\n");
99#endif
100
101	ptr = NULL;
102	n = netif_get(d, &ptr, tleft);
103	if (n == -1 || n < sizeof(*eh)) {
104		free(ptr);
105		return (-1);
106	}
107
108	eh = (struct ether_header *)((uintptr_t)ptr + ETHER_ALIGN);
109	/* Validate Ethernet address. */
110	if (bcmp(d->myea, eh->ether_dhost, 6) != 0 &&
111	    bcmp(bcea, eh->ether_dhost, 6) != 0) {
112#ifdef ETHER_DEBUG
113		if (debug)
114			printf("readether: not ours (ea=%s)\n",
115			    ether_sprintf(eh->ether_dhost));
116#endif
117		free(ptr);
118		return (-1);
119	}
120
121	*pkt = ptr;
122	*payload = (void *)((uintptr_t)eh + sizeof(*eh));
123	*etype = ntohs(eh->ether_type);
124
125	n -= sizeof(*eh);
126	return (n);
127}
128
129/*
130 * Convert Ethernet address to printable (loggable) representation.
131 */
132static char digits[] = "0123456789abcdef";
133char *
134ether_sprintf(u_char *ap)
135{
136	int i;
137	static char etherbuf[18];
138	char *cp = etherbuf;
139
140	for (i = 0; i < 6; i++) {
141		*cp++ = digits[*ap >> 4];
142		*cp++ = digits[*ap++ & 0xf];
143		*cp++ = ':';
144	}
145	*--cp = 0;
146	return (etherbuf);
147}
148