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Annotation of embedaddon/dhcp/includes/inet.h, revision 1.1.1.1

1.1       misho       1: /* inet.h
                      2: 
                      3:    Portable definitions for internet addresses */
                      4: 
                      5: /*
                      6:  * Copyright (c) 2004,2007,2009 by Internet Systems Consortium, Inc. ("ISC")
                      7:  * Copyright (c) 1996-2003 by Internet Software Consortium
                      8:  *
                      9:  * Permission to use, copy, modify, and distribute this software for any
                     10:  * purpose with or without fee is hereby granted, provided that the above
                     11:  * copyright notice and this permission notice appear in all copies.
                     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:  * This software has been written for Internet Systems Consortium
                     28:  * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
                     29:  * To learn more about Internet Systems Consortium, see
                     30:  * ``https://www.isc.org/''.  To learn more about Vixie Enterprises,
                     31:  * see ``http://www.vix.com''.   To learn more about Nominum, Inc., see
                     32:  * ``http://www.nominum.com''.
                     33:  */
                     34: 
                     35: /* An internet address of up to 128 bits. */
                     36: 
                     37: struct iaddr {
                     38:        unsigned len;
                     39:        unsigned char iabuf [16];
                     40: };
                     41: 
                     42: struct iaddrlist {
                     43:        struct iaddrlist *next;
                     44:        struct iaddr addr;
                     45: };
                     46: 
                     47: 
                     48: /* struct iaddrmatch - used to compare a host IP against a subnet spec
                     49:  *
                     50:  * There is a space/speed tradeoff here implied by the use of a second
                     51:  * struct iaddr to hold the mask; while using an unsigned (byte!) to
                     52:  * represent the subnet prefix length would be more memory efficient,
                     53:  * it makes run-time mask comparisons more expensive.  Since such
                     54:  * entries are used currently only in restricted circumstances
                     55:  * (wanting to reject a subnet), the decision is in favour of run-time
                     56:  * efficiency.
                     57:  */
                     58: 
                     59: struct iaddrmatch {
                     60:        struct iaddr addr;
                     61:        struct iaddr mask;
                     62: };
                     63: 
                     64: /* its list ... */
                     65:  
                     66: struct iaddrmatchlist {
                     67:        struct iaddrmatchlist *next;
                     68:        struct iaddrmatch match;
                     69: };
                     70: 
                     71: 
                     72: /*
                     73:  * Structure to store information about a CIDR network.
                     74:  */
                     75: 
                     76: struct iaddrcidrnet {
                     77:        struct iaddr lo_addr;
                     78:        int bits;
                     79: };
                     80: 
                     81: struct iaddrcidrnetlist {
                     82:        struct iaddrcidrnetlist *next;
                     83:        struct iaddrcidrnet cidrnet;
                     84: };
                     85: