[thirdparty/dhcp.git] / includes / inet.h

/* inet.h

   Portable definitions for internet addresses */

/*
 * Copyright (C) 2004-2022 Internet Systems Consortium, Inc. ("ISC")
 * Copyright (c) 1996-2003 by Internet Software Consortium
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 *   Internet Systems Consortium, Inc.
 *   PO Box 360
 *   Newmarket, NH 03857 USA
 *   <info@isc.org>
 *   https://www.isc.org/
 *
 */

/* An internet address of up to 128 bits. */

struct iaddr {
	unsigned len;
	unsigned char iabuf [16];
};

struct iaddrlist {
	struct iaddrlist *next;
	struct iaddr addr;
};


/* struct iaddrmatch - used to compare a host IP against a subnet spec
 *
 * There is a space/speed tradeoff here implied by the use of a second
 * struct iaddr to hold the mask; while using an unsigned (byte!) to
 * represent the subnet prefix length would be more memory efficient,
 * it makes run-time mask comparisons more expensive.  Since such
 * entries are used currently only in restricted circumstances
 * (wanting to reject a subnet), the decision is in favour of run-time
 * efficiency.
 */

struct iaddrmatch {
	struct iaddr addr;
	struct iaddr mask;
};

/* its list ... */

struct iaddrmatchlist {
	struct iaddrmatchlist *next;
	struct iaddrmatch match;
};


/*
 * Structure to store information about a CIDR network.
 */

struct iaddrcidrnet {
	struct iaddr lo_addr;
	int bits;
};

struct iaddrcidrnetlist {
	struct iaddrcidrnetlist *next;
	struct iaddrcidrnet cidrnet;
};
Commit	Line	Data
bbeaeedc TL	1	/* inet.h
	2
	3	Portable definitions for internet addresses */
	4
	5	/*
49a7fb58	6	* Copyright (C) 2004-2022 Internet Systems Consortium, Inc. ("ISC")
98311e4b	7	* Copyright (c) 1996-2003 by Internet Software Consortium
bbeaeedc	8	*
7512d88b TM	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/.
bbeaeedc	12	*
98311e4b DH	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.
bbeaeedc	20	*
98311e4b	21	* Internet Systems Consortium, Inc.
429a56d7 TM	22	* PO Box 360
429a56d7 TM	23	* Newmarket, NH 03857 USA
98311e4b	24	* <info@isc.org>
2c85ac9b	25	* https://www.isc.org/
49733f31	26	*
bbeaeedc TL	27	*/
bbeaeedc TL	28
18909bef TL	29	/* An internet address of up to 128 bits. */
18909bef TL	30
bbeaeedc	31	struct iaddr {
b1b7b521	32	unsigned len;
089fb364	33	unsigned char iabuf [16];
bbeaeedc	34	};
6d497d24 TL	35
	36	struct iaddrlist {
	37	struct iaddrlist *next;
	38	struct iaddr addr;
	39	};
febbd402 DH	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 ... */
f6b8f48d	59
febbd402 DH	60	struct iaddrmatchlist {
	61	struct iaddrmatchlist *next;
	62	struct iaddrmatch match;
	63	};
98bd7ca0 DH	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	};