external/bsd/dhcp/dist/includes/inet.h

   1 /*      $NetBSD: inet.h,v 1.1.1.3 2014/07/12 11:57:56 spz Exp $ */
   2 /* inet.h
   3
   4    Portable definitions for internet addresses */
   5
   6 /*
   7  * Copyright (c) 2004,2007,2009,2014 by Internet Systems Consortium, Inc. ("ISC")
   8  * Copyright (c) 1996-2003 by Internet Software Consortium
   9  *
  10  * Permission to use, copy, modify, and distribute this software for any
  11  * purpose with or without fee is hereby granted, provided that the above
  12  * copyright notice and this permission notice appear in all copies.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  15  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  16  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  17  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  18  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  19  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  20  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21  *
  22  *   Internet Systems Consortium, Inc.
  23  *   950 Charter Street
  24  *   Redwood City, CA 94063
  25  *   <info@isc.org>
  26  *   https://www.isc.org/
  27  *
  28  */
  29
  30 /* An internet address of up to 128 bits. */
  31
  32 struct iaddr {
  33         unsigned len;
  34         unsigned char iabuf [16];
  35 };
  36
  37 struct iaddrlist {
  38         struct iaddrlist *next;
  39         struct iaddr addr;
  40 };
  41
  42
  43 /* struct iaddrmatch - used to compare a host IP against a subnet spec
  44  *
  45  * There is a space/speed tradeoff here implied by the use of a second
  46  * struct iaddr to hold the mask; while using an unsigned (byte!) to
  47  * represent the subnet prefix length would be more memory efficient,
  48  * it makes run-time mask comparisons more expensive.  Since such
  49  * entries are used currently only in restricted circumstances
  50  * (wanting to reject a subnet), the decision is in favour of run-time
  51  * efficiency.
  52  */
  53
  54 struct iaddrmatch {
  55         struct iaddr addr;
  56         struct iaddr mask;
  57 };
  58
  59 /* its list ... */
  60
  61 struct iaddrmatchlist {
  62         struct iaddrmatchlist *next;
  63         struct iaddrmatch match;
  64 };
  65
  66
  67 /*
  68  * Structure to store information about a CIDR network.
  69  */
  70
  71 struct iaddrcidrnet {
  72         struct iaddr lo_addr;
  73         int bits;
  74 };
  75
  76 struct iaddrcidrnetlist {
  77         struct iaddrcidrnetlist *next;
  78         struct iaddrcidrnet cidrnet;
  79 };
  80