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radix.h
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radix.h
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/* $NetBSD: radix.h,v 1.19 2007/06/09 03:07:21 dyoung Exp $ */
/*
* Copyright (c) 1988, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)radix.h 8.2 (Berkeley) 10/31/94
*/
#ifndef _NET_RADIX_H_
#define _NET_RADIX_H_
/*
* Radix search tree node layout.
*/
struct radix_node {
struct radix_mask *rn_mklist; /* list of masks contained in subtree */
struct radix_node *rn_p; /* parent */
short rn_b; /* bit offset; -1-index(netmask) */
char rn_bmask; /* node: mask for bit test*/
u_char rn_flags; /* enumerated next */
#define RNF_NORMAL 1 /* leaf contains normal route */
#define RNF_ROOT 2 /* leaf is root leaf for tree */
#define RNF_ACTIVE 4 /* This node is alive (for rtfree) */
union {
struct { /* leaf only data: */
const char *rn_Key; /* object of search */
const char *rn_Mask; /* netmask, if present */
struct radix_node *rn_Dupedkey;
} rn_leaf;
struct { /* node only data: */
int rn_Off; /* where to start compare */
struct radix_node *rn_L;/* progeny */
struct radix_node *rn_R;/* progeny */
} rn_node;
} rn_u;
#ifdef RN_DEBUG
int rn_info;
struct radix_node *rn_twin;
struct radix_node *rn_ybro;
#endif
};
#define rn_dupedkey rn_u.rn_leaf.rn_Dupedkey
#define rn_key rn_u.rn_leaf.rn_Key
#define rn_mask rn_u.rn_leaf.rn_Mask
#define rn_off rn_u.rn_node.rn_Off
#define rn_l rn_u.rn_node.rn_L
#define rn_r rn_u.rn_node.rn_R
/*
* Annotations to tree concerning potential routes applying to subtrees.
*/
struct radix_mask {
short rm_b; /* bit offset; -1-index(netmask) */
char rm_unused; /* cf. rn_bmask */
u_char rm_flags; /* cf. rn_flags */
struct radix_mask *rm_mklist; /* more masks to try */
union {
const char *rmu_mask; /* the mask */
struct radix_node *rmu_leaf; /* for normal routes */
} rm_rmu;
int rm_refs; /* # of references to this struct */
};
#define rm_mask rm_rmu.rmu_mask
#define rm_leaf rm_rmu.rmu_leaf /* extra field would make 32 bytes */
#define MKGet(m) {\
if (rn_mkfreelist) {\
m = rn_mkfreelist; \
rn_mkfreelist = (m)->rm_mklist; \
} else \
R_Malloc(m, struct radix_mask *, sizeof (*(m))); }\
#define MKFree(m) { (m)->rm_mklist = rn_mkfreelist; rn_mkfreelist = (m);}
struct radix_node_head {
struct radix_node *rnh_treetop;
int rnh_addrsize; /* permit, but not require fixed keys */
int rnh_pktsize; /* permit, but not require fixed keys */
struct radix_node *(*rnh_addaddr) /* add based on sockaddr */
(const void *v, const void *mask,
struct radix_node_head *head, struct radix_node nodes[]);
struct radix_node *(*rnh_addpkt) /* add based on packet hdr */
(const void *v, const void *mask,
struct radix_node_head *head, struct radix_node nodes[]);
struct radix_node *(*rnh_deladdr) /* remove based on sockaddr */
(const void *v, const void *mask, struct radix_node_head *head);
struct radix_node *(*rnh_delpkt) /* remove based on packet hdr */
(const void *v, const void *mask, struct radix_node_head *head);
struct radix_node *(*rnh_matchaddr) /* locate based on sockaddr */
(const void *v, struct radix_node_head *head);
struct radix_node *(*rnh_lookup) /* locate based on sockaddr */
(const void *v, const void *mask, struct radix_node_head *head);
struct radix_node *(*rnh_matchpkt) /* locate based on packet hdr */
(const void *v, struct radix_node_head *head);
struct radix_node rnh_nodes[3]; /* empty tree for common case */
};
#ifdef _KERNEL
extern struct radix_mask *rn_mkfreelist;
#define Bcmp(a, b, n) ((n) == 0 ? 0 : memcmp((a), (b), (n)))
#define Bcopy(a, b, n) memmove((b), (a), (n))
#define Bzero(p, n) memset((p), 0, (n));
#define R_Malloc(p, t, n) (p = (t) malloc((size_t)(n), M_RTABLE, M_NOWAIT))
#define Free(p) free(p, M_RTABLE);
#endif /*_KERNEL*/
void rn_init(void);
int rn_inithead(void **, int);
int rn_inithead0(struct radix_node_head *, int);
int rn_refines(const void *, const void *);
int rn_walktree(struct radix_node_head *,
int (*)(struct radix_node *, void *), void *);
struct radix_node
*rn_addmask(const void *, int, int),
*rn_addroute(const void *, const void *, struct radix_node_head *,
struct radix_node [2]),
*rn_delete1(const void *, const void *, struct radix_node_head *,
struct radix_node *),
*rn_delete(const void *, const void *, struct radix_node_head *),
*rn_insert(const void *, struct radix_node_head *, int *,
struct radix_node [2]),
*rn_lookup(const void *, const void *, struct radix_node_head *),
*rn_match(const void *, struct radix_node_head *),
*rn_newpair(const void *, int, struct radix_node[2]),
*rn_search(const void *, struct radix_node *),
*rn_search_m(const void *, struct radix_node *, const void *);
#endif /* !_NET_RADIX_H_ */