includes/inet.h

   1 /* inet.h
   2
   3    Portable definitions for internet addresses */
   4
   5 /*
   6  * Copyright (C) 2004-2022 Internet Systems Consortium, Inc. ("ISC")
   7  * Copyright (c) 1996-2003 by Internet Software Consortium
   8  *
   9  * This Source Code Form is subject to the terms of the Mozilla Public
  10  * License, v. 2.0. If a copy of the MPL was not distributed with this
  11  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  14  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  15  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  16  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  17  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  18  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  19  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  20  *
  21  *   Internet Systems Consortium, Inc.
  22  *   PO Box 360
  23  *   Newmarket, NH 03857 USA
  24  *   <info@isc.org>
  25  *   https://www.isc.org/
  26  *
  27  */
  28
  29 /* An internet address of up to 128 bits. */
  30
  31 struct iaddr {
  32         unsigned len;
  33         unsigned char iabuf [16];
  34 };
  35
  36 struct iaddrlist {
  37         struct iaddrlist *next;
  38         struct iaddr addr;
  39 };
  40
  41
  42 /* struct iaddrmatch - used to compare a host IP against a subnet spec
  43  *
  44  * There is a space/speed tradeoff here implied by the use of a second
  45  * struct iaddr to hold the mask; while using an unsigned (byte!) to
  46  * represent the subnet prefix length would be more memory efficient,
  47  * it makes run-time mask comparisons more expensive.  Since such
  48  * entries are used currently only in restricted circumstances
  49  * (wanting to reject a subnet), the decision is in favour of run-time
  50  * efficiency.
  51  */
  52
  53 struct iaddrmatch {
  54         struct iaddr addr;
  55         struct iaddr mask;
  56 };
  57
  58 /* its list ... */
  59
  60 struct iaddrmatchlist {
  61         struct iaddrmatchlist *next;
  62         struct iaddrmatch match;
  63 };
  64
  65
  66 /*
  67  * Structure to store information about a CIDR network.
  68  */
  69
  70 struct iaddrcidrnet {
  71         struct iaddr lo_addr;
  72         int bits;
  73 };
  74
  75 struct iaddrcidrnetlist {
  76         struct iaddrcidrnetlist *next;
  77         struct iaddrcidrnet cidrnet;
  78 };