1 /* $NetBSD: radix.h,v 1.5 1998/10/25 14:56:08 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgment: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)radix.h 8.2 (Berkeley) 10/31/94 36 */ 37 38 #ifndef __RADIX_H_ 39 #define __RADIX_H_ 40 41 #include <sys/cdefs.h> 42 struct walkarg; 43 44 /* 45 * Radix search tree node layout. 46 */ 47 48 struct radix_node { 49 struct radix_mask *rn_mklist; /* list of masks contained in subtree */ 50 struct radix_node *rn_p; /* parent */ 51 short rn_b; /* bit offset; -1-index(netmask) */ 52 char rn_bmask; /* node: mask for bit test*/ 53 u_char rn_flags; /* enumerated next */ 54 #define RNF_NORMAL 1 /* leaf contains normal route */ 55 #define RNF_ROOT 2 /* leaf is root leaf for tree */ 56 #define RNF_ACTIVE 4 /* This node is alive (for rtfree) */ 57 union { 58 struct { /* leaf only data: */ 59 caddr_t rn_Key; /* object of search */ 60 caddr_t rn_Mask; /* netmask, if present */ 61 struct radix_node *rn_Dupedkey; 62 } rn_leaf; 63 struct { /* node only data: */ 64 int rn_Off; /* where to start compare */ 65 struct radix_node *rn_L;/* progeny */ 66 struct radix_node *rn_R;/* progeny */ 67 }rn_node; 68 } rn_u; 69 #ifdef RN_DEBUG 70 int rn_info; 71 struct radix_node *rn_twin; 72 struct radix_node *rn_ybro; 73 #endif 74 }; 75 76 #define rn_dupedkey rn_u.rn_leaf.rn_Dupedkey 77 #define rn_key rn_u.rn_leaf.rn_Key 78 #define rn_mask rn_u.rn_leaf.rn_Mask 79 #define rn_off rn_u.rn_node.rn_Off 80 #define rn_l rn_u.rn_node.rn_L 81 #define rn_r rn_u.rn_node.rn_R 82 83 /* 84 * Annotations to tree concerning potential routes applying to subtrees. 85 */ 86 87 extern struct radix_mask { 88 short rm_b; /* bit offset; -1-index(netmask) */ 89 char rm_unused; /* cf. rn_bmask */ 90 u_char rm_flags; /* cf. rn_flags */ 91 struct radix_mask *rm_mklist; /* more masks to try */ 92 union { 93 caddr_t rmu_mask; /* the mask */ 94 struct radix_node *rmu_leaf; /* for normal routes */ 95 } rm_rmu; 96 int rm_refs; /* # of references to this struct */ 97 } *rn_mkfreelist; 98 99 #define rm_mask rm_rmu.rmu_mask 100 #define rm_leaf rm_rmu.rmu_leaf /* extra field would make 32 bytes */ 101 102 #define MKGet(m) {\ 103 if (rn_mkfreelist) {\ 104 m = rn_mkfreelist; \ 105 rn_mkfreelist = (m)->rm_mklist; \ 106 } else \ 107 m = (struct radix_mask *)rtmalloc(sizeof(*(m)), "MKGet"); }\ 108 109 #define MKFree(m) { (m)->rm_mklist = rn_mkfreelist; rn_mkfreelist = (m);} 110 111 struct radix_node_head { 112 struct radix_node *rnh_treetop; 113 int rnh_addrsize; /* permit, but not require fixed keys */ 114 int rnh_pktsize; /* permit, but not require fixed keys */ 115 struct radix_node *(*rnh_addaddr) /* add based on sockaddr */ 116 __P((void *v, void *mask, 117 struct radix_node_head *head, struct radix_node nodes[])); 118 struct radix_node *(*rnh_addpkt) /* add based on packet hdr */ 119 __P((void *v, void *mask, 120 struct radix_node_head *head, struct radix_node nodes[])); 121 struct radix_node *(*rnh_deladdr) /* remove based on sockaddr */ 122 __P((void *v, void *mask, struct radix_node_head *head)); 123 struct radix_node *(*rnh_delpkt) /* remove based on packet hdr */ 124 __P((void *v, void *mask, struct radix_node_head *head)); 125 struct radix_node *(*rnh_matchaddr) /* locate based on sockaddr */ 126 __P((void *v, struct radix_node_head *head)); 127 struct radix_node *(*rnh_lookup) /* locate based on sockaddr */ 128 __P((void *v, void *mask, struct radix_node_head *head)); 129 struct radix_node *(*rnh_matchpkt) /* locate based on packet hdr */ 130 __P((void *v, struct radix_node_head *head)); 131 int (*rnh_walktree) /* traverse tree */ 132 (struct radix_node_head *head, 133 int (*f)(struct radix_node *, struct walkarg *), 134 struct walkarg *w); 135 struct radix_node rnh_nodes[3]; /* empty tree for common case */ 136 }; 137 138 139 #define Bcmp(a, b, n) memcmp(((void *)(a)), ((void *)(b)), (n)) 140 #define Bcopy(a, b, n) memmove(((void *)(b)), ((void *)(a)), (size_t)(n)) 141 #define Bzero(p, n) memset((void *)(p), 0, (size_t)(n)); 142 #define Free(p) free((void *)p); 143 144 void rn_init __P((void)); 145 int rn_inithead __P((void **, int)); 146 int rn_refines __P((void *, void *)); 147 int rn_walktree __P((struct radix_node_head *, 148 int (*)__P((struct radix_node *, struct walkarg *)), 149 struct walkarg *)); 150 151 struct radix_node 152 *rn_addmask __P((void *, int, int)), 153 *rn_addroute __P((void *, void *, struct radix_node_head *, 154 struct radix_node [2])), 155 *rn_delete __P((void *, void *, struct radix_node_head *)), 156 *rn_insert __P((void *, struct radix_node_head *, int *, 157 struct radix_node [2])), 158 *rn_match __P((void *, struct radix_node_head *)), 159 *rn_newpair __P((void *, int, struct radix_node[2])), 160 *rn_search __P((void *, struct radix_node *)), 161 *rn_search_m __P((void *, struct radix_node *, void *)); 162 163 struct radix_node *rn_lookup __P((void *, void *, struct radix_node_head *)); 164 165 #endif /* __RADIX_H_ */ 166