1/*	$NetBSD: ieee8023_tlv.c,v 1.2 2005/12/11 12:24:54 christos Exp $	*/
2
3/*-
4 * Copyright (c)2005 YAMAMOTO Takashi,
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: ieee8023_tlv.c,v 1.2 2005/12/11 12:24:54 christos Exp $");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34
35#include <net/agr/ieee8023_tlv.h>
36
37int
38tlv_check(const void *p, size_t size, const struct tlvhdr *tlv,
39    const struct tlv_template *tmpl, bool check_type)
40{
41
42	while (/* CONSTCOND */ 1) {
43		if ((const char *)tlv - (const char *)p + sizeof(*tlv) > size) {
44			return EINVAL;
45		}
46		if ((check_type && tlv->tlv_type != tmpl->tmpl_type) ||
47		    tlv->tlv_length != tmpl->tmpl_length) {
48			return EINVAL;
49		}
50		if (tmpl->tmpl_type == 0) {
51			break;
52		}
53		tlv = (const struct tlvhdr *)
54		    ((const char *)tlv + tlv->tlv_length);
55		tmpl++;
56	}
57
58	return 0;
59}
60
61