1 /* inet.h
2 
3    Portable definitions for internet addresses */
4 
5 /*
6  * Copyright (c) 2004-2017 by 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  *   950 Charter Street
23  *   Redwood City, CA 94063
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 };
79 
80