ISC DHCP  4.4.3-P1
A reference DHCPv4 and DHCPv6 implementation
inet.h
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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 
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 
78 };
struct iaddrcidrnet cidrnet
Definition: inet.h:77
struct iaddrlist * next
Definition: inet.h:37
int bits
Definition: inet.h:72
unsigned char iabuf[16]
Definition: inet.h:33
unsigned len
Definition: inet.h:32
struct iaddrmatchlist * next
Definition: inet.h:61
struct iaddr addr
Definition: inet.h:38
Definition: inet.h:36
struct iaddrcidrnetlist * next
Definition: inet.h:76
Definition: inet.h:31
struct iaddr addr
Definition: inet.h:54
struct iaddr lo_addr
Definition: inet.h:71
struct iaddr mask
Definition: inet.h:55
struct iaddrmatch match
Definition: inet.h:62