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