sys/net/agr/ieee8023_tlv.c

   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
  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