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

     /*
      * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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
     * $FreeBSD: src/sys/net/radix.h,v 1.9.4.1 1999/09/05 08:17:56 peter Exp $
     */
    
    #ifndef _RADIX_H_
    #define _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: */
                            caddr_t rn_Key;         /* object of search */
                            caddr_t 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.
     */
    
    extern 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   {
                    caddr_t rmu_mask;               /* the mask */
                    struct  radix_node *rmu_leaf;   /* for normal routes */
            }       rm_rmu;
            int     rm_refs;                /* # of references to this struct */
    } *rn_mkfreelist;
    
    #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);}
   
   typedef int walktree_f_t __P((struct radix_node *, void *));
   
   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 */
                   __P((void *v, void *mask,
                        struct radix_node_head *head, struct radix_node nodes[]));
           struct  radix_node *(*rnh_addpkt)       /* add based on packet hdr */
                   __P((void *v, void *mask,
                        struct radix_node_head *head, struct radix_node nodes[]));
           struct  radix_node *(*rnh_deladdr)      /* remove based on sockaddr */
                   __P((void *v, void *mask, struct radix_node_head *head));
           struct  radix_node *(*rnh_delpkt)       /* remove based on packet hdr */
                   __P((void *v, void *mask, struct radix_node_head *head));
           struct  radix_node *(*rnh_matchaddr)    /* locate based on sockaddr */
                   __P((void *v, struct radix_node_head *head));
           struct  radix_node *(*rnh_lookup)       /* locate based on sockaddr */
                   __P((void *v, void *mask, struct radix_node_head *head));
           struct  radix_node *(*rnh_matchpkt)     /* locate based on packet hdr */
                   __P((void *v, struct radix_node_head *head));
           int     (*rnh_walktree)                 /* traverse tree */
                   __P((struct radix_node_head *head, walktree_f_t *f, void *w));
           int     (*rnh_walktree_from)            /* traverse tree below a */
                   __P((struct radix_node_head *head, void *a, void *m,
                        walktree_f_t *f, void *w));
           void    (*rnh_close)    /* do something when the last ref drops */
                   __P((struct radix_node *rn, struct radix_node_head *head));
           struct  radix_node rnh_nodes[3];        /* empty tree for common case */
   };
   
   #ifndef KERNEL
   #define Bcmp(a, b, n) bcmp(((char *)(a)), ((char *)(b)), (n))
   #define Bcopy(a, b, n) bcopy(((char *)(a)), ((char *)(b)), (unsigned)(n))
   #define Bzero(p, n) bzero((char *)(p), (int)(n));
   #define R_Malloc(p, t, n) (p = (t) malloc((unsigned int)(n)))
   #define Free(p) free((char *)p);
   #else
   #define Bcmp(a, b, n) bcmp(((caddr_t)(a)), ((caddr_t)(b)), (unsigned)(n))
   #define Bcopy(a, b, n) bcopy(((caddr_t)(a)), ((caddr_t)(b)), (unsigned)(n))
   #define Bzero(p, n) bzero((caddr_t)(p), (unsigned)(n));
   #define R_Malloc(p, t, n) (p = (t) malloc((unsigned long)(n), M_RTABLE, M_DONTWAIT))
   #define Free(p) free((caddr_t)p, M_RTABLE);
   #endif /*KERNEL*/
   
   extern struct radix_node_head *mask_rnhead;
   
   void     rn_init __P((void));
   int      rn_inithead __P((void **, int));
   int      rn_refines __P((void *, void *));
   struct radix_node
            *rn_addmask __P((void *, int, int)),
            *rn_addroute __P((void *, void *, struct radix_node_head *,
                           struct radix_node [2])),
            *rn_match __P((void *, struct radix_node_head *));
   
   
   #endif /* _RADIX_H_ */

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