FreeBSD/Linux Kernel Cross Reference
sys/net/radix.h
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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)radix.h 8.2 (Berkeley) 10/31/94
34 * $FreeBSD: src/sys/net/radix.h,v 1.9.4.1 1999/09/05 08:17:56 peter Exp $
35 */
36
37 #ifndef _RADIX_H_
38 #define _RADIX_H_
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 extern 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 } *rn_mkfreelist;
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 R_Malloc(m, struct radix_mask *, sizeof (*(m))); }\
104
105 #define MKFree(m) { (m)->rm_mklist = rn_mkfreelist; rn_mkfreelist = (m);}
106
107 typedef int walktree_f_t __P((struct radix_node *, void *));
108
109 struct radix_node_head {
110 struct radix_node *rnh_treetop;
111 int rnh_addrsize; /* permit, but not require fixed keys */
112 int rnh_pktsize; /* permit, but not require fixed keys */
113 struct radix_node *(*rnh_addaddr) /* add based on sockaddr */
114 __P((void *v, void *mask,
115 struct radix_node_head *head, struct radix_node nodes[]));
116 struct radix_node *(*rnh_addpkt) /* add based on packet hdr */
117 __P((void *v, void *mask,
118 struct radix_node_head *head, struct radix_node nodes[]));
119 struct radix_node *(*rnh_deladdr) /* remove based on sockaddr */
120 __P((void *v, void *mask, struct radix_node_head *head));
121 struct radix_node *(*rnh_delpkt) /* remove based on packet hdr */
122 __P((void *v, void *mask, struct radix_node_head *head));
123 struct radix_node *(*rnh_matchaddr) /* locate based on sockaddr */
124 __P((void *v, struct radix_node_head *head));
125 struct radix_node *(*rnh_lookup) /* locate based on sockaddr */
126 __P((void *v, void *mask, struct radix_node_head *head));
127 struct radix_node *(*rnh_matchpkt) /* locate based on packet hdr */
128 __P((void *v, struct radix_node_head *head));
129 int (*rnh_walktree) /* traverse tree */
130 __P((struct radix_node_head *head, walktree_f_t *f, void *w));
131 int (*rnh_walktree_from) /* traverse tree below a */
132 __P((struct radix_node_head *head, void *a, void *m,
133 walktree_f_t *f, void *w));
134 void (*rnh_close) /* do something when the last ref drops */
135 __P((struct radix_node *rn, struct radix_node_head *head));
136 struct radix_node rnh_nodes[3]; /* empty tree for common case */
137 };
138
139 #ifndef KERNEL
140 #define Bcmp(a, b, n) bcmp(((char *)(a)), ((char *)(b)), (n))
141 #define Bcopy(a, b, n) bcopy(((char *)(a)), ((char *)(b)), (unsigned)(n))
142 #define Bzero(p, n) bzero((char *)(p), (int)(n));
143 #define R_Malloc(p, t, n) (p = (t) malloc((unsigned int)(n)))
144 #define Free(p) free((char *)p);
145 #else
146 #define Bcmp(a, b, n) bcmp(((caddr_t)(a)), ((caddr_t)(b)), (unsigned)(n))
147 #define Bcopy(a, b, n) bcopy(((caddr_t)(a)), ((caddr_t)(b)), (unsigned)(n))
148 #define Bzero(p, n) bzero((caddr_t)(p), (unsigned)(n));
149 #define R_Malloc(p, t, n) (p = (t) malloc((unsigned long)(n), M_RTABLE, M_DONTWAIT))
150 #define Free(p) free((caddr_t)p, M_RTABLE);
151 #endif /*KERNEL*/
152
153 extern struct radix_node_head *mask_rnhead;
154
155 void rn_init __P((void));
156 int rn_inithead __P((void **, int));
157 int rn_refines __P((void *, void *));
158 struct radix_node
159 *rn_addmask __P((void *, int, int)),
160 *rn_addroute __P((void *, void *, struct radix_node_head *,
161 struct radix_node [2])),
162 *rn_match __P((void *, struct radix_node_head *));
163
164
165 #endif /* _RADIX_H_ */
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