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/*

 * 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 1.18 2002/03/19 21:54:18 alfred Exp $

 */

#ifndef _RADIX_H_

#define _RADIX_H_

#ifdef MALLOC_DECLARE

MALLOC_DECLARE(M_RTABLE);

#endif

/*

 * Radix search tree node layout.

 */

struct radix_node {

        struct  radix_mask *rn_mklist;  /* list of masks contained in subtree */

        struct  radix_node *rn_parent;  /* parent */

        short   rn_bit;                 /* 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_offset       rn_u.rn_node.rn_Off

#define rn_left         rn_u.rn_node.rn_L

#define rn_right        rn_u.rn_node.rn_R

/*

 * Annotations to tree concerning potential routes applying to subtrees.

 */

struct radix_mask {

        short   rm_bit;                 /* 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 */

};

#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(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 */

                (void *v, void *mask,

                     struct radix_node_head *head, struct radix_node nodes[]);

        struct  radix_node *(*rnh_addpkt)       /* add based on packet hdr */

                (void *v, void *mask,

                     struct radix_node_head *head, struct radix_node nodes[]);

        struct  radix_node *(*rnh_deladdr)      /* remove based on sockaddr */

                (void *v, void *mask, struct radix_node_head *head);

        struct  radix_node *(*rnh_delpkt)       /* remove based on packet hdr */

                (void *v, void *mask, struct radix_node_head *head);

        struct  radix_node *(*rnh_matchaddr)    /* locate based on sockaddr */

                (void *v, struct radix_node_head *head);

        struct  radix_node *(*rnh_lookup)       /* locate based on sockaddr */

                (void *v, void *mask, struct radix_node_head *head);

        struct  radix_node *(*rnh_matchpkt)     /* locate based on packet hdr */

                (void *v, struct radix_node_head *head);

        int     (*rnh_walktree)                 /* traverse tree */

                (struct radix_node_head *head, walktree_f_t *f, void *w);

        int     (*rnh_walktree_from)            /* traverse tree below a */

                (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 */

                (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 */

void     rn_init(void);

int      rn_inithead(void **, int);

int      rn_refines(void *, void *);

struct radix_node

         *rn_addmask(void *, int, int),

         *rn_addroute (void *, void *, struct radix_node_head *,

                        struct radix_node [2]),

         *rn_delete(void *, void *, struct radix_node_head *),

         *rn_lookup (void *v_arg, void *m_arg,

                        struct radix_node_head *head),

         *rn_match(void *, struct radix_node_head *);

#endif /* _RADIX_H_ */