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/** BEGIN COPYRIGHT BLOCK
* This Program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; version 2 of the License.
*
* This Program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this Program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA.
*
* In addition, as a special exception, Red Hat, Inc. gives You the additional
* right to link the code of this Program with code not covered under the GNU
* General Public License ("Non-GPL Code") and to distribute linked combinations
* including the two, subject to the limitations in this paragraph. Non-GPL Code
* permitted under this exception must only link to the code of this Program
* through those well defined interfaces identified in the file named EXCEPTION
* found in the source code files (the "Approved Interfaces"). The files of
* Non-GPL Code may instantiate templates or use macros or inline functions from
* the Approved Interfaces without causing the resulting work to be covered by
* the GNU General Public License. Only Red Hat, Inc. may make changes or
* additions to the list of Approved Interfaces. You must obey the GNU General
* Public License in all respects for all of the Program code and other code used
* in conjunction with the Program except the Non-GPL Code covered by this
* exception. If you modify this file, you may extend this exception to your
* version of the file, but you are not obligated to do so. If you do not wish to
* provide this exception without modification, you must delete this exception
* statement from your version and license this file solely under the GPL without
* exception.
*
*
* Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
#ifndef __ipfstruct_h
#define __ipfstruct_h
/*
* Description (ipfstruct.h)
*
* This file defines types and structures used to represent an
* IP address filter in memory. An IP address filter contains
* specifications of IP host and network addresses. Each of
* these specifications can be associated with whatever information
* is appropriate for a particular use of an IP address filter.
*/
/* Define a scalar IP address value */
#ifndef __IPADDR_T_
#define __IPADDR_T_
typedef unsigned long IPAddr_t;
#endif /* __IPADDR_T_ */
/*
* Description (IPNode_t)
*
* This type describes an internal node in the radix tree. An internal
* node has a link up the tree to its parent, and up to three links
* down the tree to its descendants. Each internal node is used to
* test a particular bit in a given IP address, and traverse down the
* tree in a direction which depends on whether the bit is set, clear,
* or masked out. The descendants of an internal node may be internal
* nodes or leaf nodes (IPLeaf_t).
*/
/* Define indices of links in an IPNode_t */
#define IPN_CLEAR 0 /* link to node with ipn_bit clear */
#define IPN_SET 1 /* link to node with ipn_bit set */
#define IPN_MASKED 2 /* link to node with ipn_bit masked out */
#define IPN_NLINKS 3 /* number of links */
typedef struct IPNode_s IPNode_t;
struct IPNode_s {
char ipn_type; /* node type */
#define IPN_LEAF 0 /* leaf node */
#define IPN_NODE 1 /* internal node */
char ipn_bit; /* bit number (31-0) to test */
IPNode_t * ipn_parent; /* link to parent node */
IPNode_t * ipn_links[IPN_NLINKS];
};
/* Helper definitions */
#define ipn_clear ipn_links[IPN_CLEAR]
#define ipn_set ipn_links[IPN_SET]
#define ipn_masked ipn_links[IPN_MASKED]
/*
* Description (IPLeaf_t)
*
* This type describes a leaf node in the radix tree. A leaf node
* contains an IP host or network address, and a network mask. A
* given IP address matches a leaf node if the IP address, when masked
* by ipl_netmask, equals ipl_ipaddr.
*/
typedef struct IPLeaf_s IPLeaf_t;
struct IPLeaf_s {
char ipl_type; /* see ipn_type in IPNode_t */
IPAddr_t ipl_netmask; /* IP network mask */
IPAddr_t ipl_ipaddr; /* IP address of host or network */
};
typedef struct IPFilter_s IPFilter_t;
struct IPFilter_s {
IPFilter_t * ipf_next; /* link to next filter */
IPNode_t * ipf_tree; /* pointer to radix tree structure */
};
#endif /* __ipfstruct_h */
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