radix.h

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    1 /*      $OpenBSD: radix.h,v 1.30 2017/06/19 09:42:45 mpi Exp $  */
    2 /*      $NetBSD: radix.h,v 1.8 1996/02/13 22:00:37 christos Exp $       */
    3 
    4 /*
    5  * Copyright (c) 1988, 1989, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)radix.h     8.2 (Berkeley) 10/31/94
   33  */
   34 
   35 #ifndef _NET_RADIX_H_
   36 #define _NET_RADIX_H_
   37 
   38 /*
   39  * Radix search tree node layout.
   40  */
   41 
   42 struct radix_node {
   43         struct  radix_mask *rn_mklist;  /* list of masks contained in subtree */
   44         struct  radix_node *rn_p;       /* parent */
   45         short   rn_b;                   /* bit offset; -1-index(netmask) */
   46         char    rn_bmask;               /* node: mask for bit test*/
   47         u_char  rn_flags;               /* enumerated next */
   48 #define RNF_NORMAL      1               /* leaf contains normal route */
   49 #define RNF_ROOT        2               /* leaf is root leaf for tree */
   50 #define RNF_ACTIVE      4               /* This node is alive (for rtfree) */
   51         union {
   52                 struct {                        /* leaf only data: */
   53                         caddr_t rn_Key;         /* object of search */
   54                         caddr_t rn_Mask;        /* netmask, if present */
   55                         struct  radix_node *rn_Dupedkey;
   56                 } rn_leaf;
   57                 struct {                        /* node only data: */
   58                         int     rn_Off;         /* where to start compare */
   59                         struct  radix_node *rn_L;/* progeny */
   60                         struct  radix_node *rn_R;/* progeny */
   61                 } rn_node;
   62         } rn_u;
   63 };
   64 
   65 #define rn_dupedkey rn_u.rn_leaf.rn_Dupedkey
   66 #define rn_key rn_u.rn_leaf.rn_Key
   67 #define rn_mask rn_u.rn_leaf.rn_Mask
   68 #define rn_off rn_u.rn_node.rn_Off
   69 #define rn_l rn_u.rn_node.rn_L
   70 #define rn_r rn_u.rn_node.rn_R
   71 
   72 /*
   73  * Annotations to tree concerning potential routes applying to subtrees.
   74  */
   75 
   76 struct radix_mask {
   77         short   rm_b;                   /* bit offset; -1-index(netmask) */
   78         char    rm_unused;              /* cf. rn_bmask */
   79         u_char  rm_flags;               /* cf. rn_flags */
   80         struct  radix_mask *rm_mklist;  /* more masks to try */
   81         union   {
   82                 caddr_t rmu_mask;               /* the mask */
   83                 struct  radix_node *rmu_leaf;   /* for normal routes */
   84         }       rm_rmu;
   85         int     rm_refs;                /* # of references to this struct */
   86 };
   87 
   88 #define rm_mask rm_rmu.rmu_mask
   89 #define rm_leaf rm_rmu.rmu_leaf         /* extra field would make 32 bytes */
   90 
   91 struct radix_node_head {
   92         struct  radix_node *rnh_treetop;
   93         int     rnh_addrsize;           /* permit, but not require fixed keys */
   94         int     rnh_pktsize;            /* permit, but not require fixed keys */
   95         struct  radix_node rnh_nodes[3];/* empty tree for common case */
   96         u_int   rnh_rtableid;
   97 };
   98 
   99 void    rn_init(unsigned int);
  100 int     rn_inithead(void **, int);
  101 
  102 int     rn_walktree(struct radix_node_head *,
  103             int (*)(struct radix_node *, void *, u_int), void *);
  104 
  105 struct radix_node       *rn_addroute(void *, void *, struct radix_node_head *,
  106                             struct radix_node [2], u_int8_t);
  107 struct radix_node       *rn_delete(void *, void *, struct radix_node_head *,
  108                             struct radix_node *);
  109 struct radix_node       *rn_lookup(void *, void *, struct radix_node_head *);
  110 struct radix_node       *rn_match(void *, struct radix_node_head *);
  111 
  112 #endif /* _NET_RADIX_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/net/radix.h

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sys/net/radix.h