1/* $NetBSD: inet.h,v 1.3 2022/04/03 01:10:58 christos Exp $ */ 2 3/* inet.h 4 5 Portable definitions for internet addresses */ 6 7/* 8 * Copyright (C) 2004-2022 Internet Systems Consortium, Inc. ("ISC") 9 * Copyright (c) 1996-2003 by Internet Software Consortium 10 * 11 * This Source Code Form is subject to the terms of the Mozilla Public 12 * License, v. 2.0. If a copy of the MPL was not distributed with this 13 * file, You can obtain one at http://mozilla.org/MPL/2.0/. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 16 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 17 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 18 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 19 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 20 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 21 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 22 * 23 * Internet Systems Consortium, Inc. 24 * PO Box 360 25 * Newmarket, NH 03857 USA 26 * <info@isc.org> 27 * https://www.isc.org/ 28 * 29 */ 30 31/* An internet address of up to 128 bits. */ 32 33struct iaddr { 34 unsigned len; 35 unsigned char iabuf [16]; 36}; 37 38struct iaddrlist { 39 struct iaddrlist *next; 40 struct iaddr addr; 41}; 42 43 44/* struct iaddrmatch - used to compare a host IP against a subnet spec 45 * 46 * There is a space/speed tradeoff here implied by the use of a second 47 * struct iaddr to hold the mask; while using an unsigned (byte!) to 48 * represent the subnet prefix length would be more memory efficient, 49 * it makes run-time mask comparisons more expensive. Since such 50 * entries are used currently only in restricted circumstances 51 * (wanting to reject a subnet), the decision is in favour of run-time 52 * efficiency. 53 */ 54 55struct iaddrmatch { 56 struct iaddr addr; 57 struct iaddr mask; 58}; 59 60/* its list ... */ 61 62struct iaddrmatchlist { 63 struct iaddrmatchlist *next; 64 struct iaddrmatch match; 65}; 66 67 68/* 69 * Structure to store information about a CIDR network. 70 */ 71 72struct iaddrcidrnet { 73 struct iaddr lo_addr; 74 int bits; 75}; 76 77struct iaddrcidrnetlist { 78 struct iaddrcidrnetlist *next; 79 struct iaddrcidrnet cidrnet; 80}; 81