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fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
188 lines
6.8 KiB
C
188 lines
6.8 KiB
C
/*-
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* Copyright (c) 1988, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)radix.h 8.2 (Berkeley) 10/31/94
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* $FreeBSD$
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*/
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#ifndef _RADIX_H_
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#define _RADIX_H_
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#ifdef _KERNEL
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <sys/_rwlock.h>
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#endif
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_RTABLE);
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#endif
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/*
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* Radix search tree node layout.
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*/
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struct radix_node {
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struct radix_mask *rn_mklist; /* list of masks contained in subtree */
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struct radix_node *rn_parent; /* parent */
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short rn_bit; /* bit offset; -1-index(netmask) */
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char rn_bmask; /* node: mask for bit test*/
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u_char rn_flags; /* enumerated next */
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#define RNF_NORMAL 1 /* leaf contains normal route */
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#define RNF_ROOT 2 /* leaf is root leaf for tree */
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#define RNF_ACTIVE 4 /* This node is alive (for rtfree) */
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union {
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struct { /* leaf only data: */
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caddr_t rn_Key; /* object of search */
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caddr_t rn_Mask; /* netmask, if present */
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struct radix_node *rn_Dupedkey;
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} rn_leaf;
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struct { /* node only data: */
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int rn_Off; /* where to start compare */
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struct radix_node *rn_L;/* progeny */
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struct radix_node *rn_R;/* progeny */
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} rn_node;
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} rn_u;
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#ifdef RN_DEBUG
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int rn_info;
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struct radix_node *rn_twin;
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struct radix_node *rn_ybro;
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#endif
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};
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#define rn_dupedkey rn_u.rn_leaf.rn_Dupedkey
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#define rn_key rn_u.rn_leaf.rn_Key
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#define rn_mask rn_u.rn_leaf.rn_Mask
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#define rn_offset rn_u.rn_node.rn_Off
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#define rn_left rn_u.rn_node.rn_L
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#define rn_right rn_u.rn_node.rn_R
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/*
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* Annotations to tree concerning potential routes applying to subtrees.
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*/
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struct radix_mask {
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short rm_bit; /* bit offset; -1-index(netmask) */
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char rm_unused; /* cf. rn_bmask */
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u_char rm_flags; /* cf. rn_flags */
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struct radix_mask *rm_mklist; /* more masks to try */
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union {
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caddr_t rmu_mask; /* the mask */
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struct radix_node *rmu_leaf; /* for normal routes */
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} rm_rmu;
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int rm_refs; /* # of references to this struct */
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};
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#define rm_mask rm_rmu.rmu_mask
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#define rm_leaf rm_rmu.rmu_leaf /* extra field would make 32 bytes */
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struct radix_head;
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typedef int walktree_f_t(struct radix_node *, void *);
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typedef struct radix_node *rn_matchaddr_f_t(void *v,
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struct radix_head *head);
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typedef struct radix_node *rn_addaddr_f_t(void *v, void *mask,
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struct radix_head *head, struct radix_node nodes[]);
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typedef struct radix_node *rn_deladdr_f_t(void *v, void *mask,
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struct radix_head *head);
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typedef struct radix_node *rn_lookup_f_t(void *v, void *mask,
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struct radix_head *head);
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typedef int rn_walktree_t(struct radix_head *head, walktree_f_t *f,
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void *w);
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typedef int rn_walktree_from_t(struct radix_head *head,
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void *a, void *m, walktree_f_t *f, void *w);
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typedef void rn_close_t(struct radix_node *rn, struct radix_head *head);
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struct radix_mask_head;
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struct radix_head {
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struct radix_node *rnh_treetop;
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struct radix_mask_head *rnh_masks; /* Storage for our masks */
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};
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struct radix_node_head {
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struct radix_head rh;
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rn_matchaddr_f_t *rnh_matchaddr; /* longest match for sockaddr */
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rn_addaddr_f_t *rnh_addaddr; /* add based on sockaddr*/
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rn_deladdr_f_t *rnh_deladdr; /* remove based on sockaddr */
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rn_lookup_f_t *rnh_lookup; /* exact match for sockaddr */
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rn_walktree_t *rnh_walktree; /* traverse tree */
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rn_walktree_from_t *rnh_walktree_from; /* traverse tree below a */
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rn_close_t *rnh_close; /*do something when the last ref drops*/
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struct radix_node rnh_nodes[3]; /* empty tree for common case */
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#ifdef _KERNEL
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struct rwlock rnh_lock; /* locks entire radix tree */
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#endif
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};
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struct radix_mask_head {
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struct radix_head head;
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struct radix_node mask_nodes[3];
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};
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void rn_inithead_internal(struct radix_head *rh, struct radix_node *base_nodes,
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int off);
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#ifndef _KERNEL
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#define R_Malloc(p, t, n) (p = (t) malloc((unsigned int)(n)))
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#define R_Zalloc(p, t, n) (p = (t) calloc(1,(unsigned int)(n)))
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#define R_Free(p) free((char *)p);
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#else
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#define R_Malloc(p, t, n) (p = (t) malloc((unsigned long)(n), M_RTABLE, M_NOWAIT))
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#define R_Zalloc(p, t, n) (p = (t) malloc((unsigned long)(n), M_RTABLE, M_NOWAIT | M_ZERO))
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#define R_Free(p) free((caddr_t)p, M_RTABLE);
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#define RADIX_NODE_HEAD_LOCK_INIT(rnh) \
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rw_init_flags(&(rnh)->rnh_lock, "radix node head", 0)
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#define RADIX_NODE_HEAD_LOCK(rnh) rw_wlock(&(rnh)->rnh_lock)
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#define RADIX_NODE_HEAD_UNLOCK(rnh) rw_wunlock(&(rnh)->rnh_lock)
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#define RADIX_NODE_HEAD_RLOCK(rnh) rw_rlock(&(rnh)->rnh_lock)
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#define RADIX_NODE_HEAD_RUNLOCK(rnh) rw_runlock(&(rnh)->rnh_lock)
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#define RADIX_NODE_HEAD_LOCK_TRY_UPGRADE(rnh) rw_try_upgrade(&(rnh)->rnh_lock)
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#define RADIX_NODE_HEAD_DESTROY(rnh) rw_destroy(&(rnh)->rnh_lock)
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#define RADIX_NODE_HEAD_LOCK_ASSERT(rnh) rw_assert(&(rnh)->rnh_lock, RA_LOCKED)
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#define RADIX_NODE_HEAD_WLOCK_ASSERT(rnh) rw_assert(&(rnh)->rnh_lock, RA_WLOCKED)
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#endif /* _KERNEL */
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int rn_inithead(void **, int);
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int rn_detachhead(void **);
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int rn_refines(void *, void *);
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struct radix_node *rn_addroute(void *, void *, struct radix_head *,
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struct radix_node[2]);
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struct radix_node *rn_delete(void *, void *, struct radix_head *);
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struct radix_node *rn_lookup (void *v_arg, void *m_arg,
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struct radix_head *head);
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struct radix_node *rn_match(void *, struct radix_head *);
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int rn_walktree_from(struct radix_head *h, void *a, void *m,
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walktree_f_t *f, void *w);
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int rn_walktree(struct radix_head *, walktree_f_t *, void *);
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#endif /* _RADIX_H_ */
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