1 /* $NetBSD: ieee8023_tlv.c,v 1.3 2007/02/21 23:00:06 thorpej 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 1.3 2007/02/21 23:00:06 thorpej Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 35 #include <net/agr/ieee8023_tlv.h> 36 37 int 38 tlv_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