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Contents of /ircd-hybrid/trunk/include/patricia.h

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Revision 7822 - (show annotations)
Wed Oct 19 21:53:19 2016 UTC (4 years, 1 month ago) by michael
File MIME type: text/x-csrc
File size: 5212 byte(s)
- patricia.h, patricia.c: constification

1 /*
2 * $Id$
3 * Dave Plonka <plonka@doit.wisc.edu>
4 *
5 * This file had been called "radix.h" in the MRT sources.
6 *
7 * I renamed it to "patricia.h" since it's not an implementation of a general
8 * radix trie. Also, pulled in various requirements from "mrt.h" and added
9 * some other things it could be used as a standalone API.
10 *
11 * Copyright (c) 1999-2013
12 *
13 * The Regents of the University of Michigan ("The Regents") and Merit
14 * Network, Inc.
15 *
16 * Redistributions of source code must retain the above copyright notice,
17 * this list of conditions and the following disclaimer.
18 *
19 * Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
29 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #ifndef _PATRICIA_H
37 #define _PATRICIA_H
38
39 /* { from defs.h */
40 #define prefix_touchar(prefix) ((unsigned char *)&(prefix)->add.sin)
41 #define MAXLINE 1024
42 #define BIT_TEST(f, b) ((f) & (b))
43 /* } */
44
45 #include <netinet/in.h> /* for struct in_addr */
46 #include <sys/socket.h> /* for AF_INET */
47
48 /* { from mrt.h */
49
50 typedef struct _prefix_t {
51 unsigned short family; /* AF_INET | AF_INET6 */
52 unsigned short bitlen; /* same as mask? */
53 int ref_count; /* reference count */
54 union {
55 struct in_addr sin;
56 struct in6_addr sin6;
57 } add;
58 } prefix_t;
59
60 /* } */
61
62 typedef struct _patricia_node_t {
63 unsigned int bit; /* flag if this node used */
64 prefix_t *prefix; /* who we are in patricia tree */
65 struct _patricia_node_t *l, *r; /* left and right children */
66 struct _patricia_node_t *parent;/* may be used */
67 void *data; /* pointer to data */
68 void *user1; /* pointer to usr data (ex. route flap info) */
69 } patricia_node_t;
70
71 typedef struct _patricia_tree_t {
72 patricia_node_t *head;
73 unsigned int maxbits; /* for IP, 32 bit addresses */
74 int num_active_node; /* for debug purpose */
75 } patricia_tree_t;
76
77
78 extern patricia_node_t *patricia_search_exact (patricia_tree_t *patricia, prefix_t *prefix);
79 extern patricia_node_t *patricia_search_best (patricia_tree_t *patricia, prefix_t *prefix);
80 extern patricia_node_t * patricia_search_best2 (patricia_tree_t *patricia, prefix_t *prefix,
81 int inclusive);
82 extern patricia_node_t *patricia_lookup (patricia_tree_t *patricia, prefix_t *prefix);
83 extern void patricia_remove (patricia_tree_t *patricia, patricia_node_t *node);
84 extern patricia_tree_t *New_Patricia (int maxbits);
85 extern void Clear_Patricia (patricia_tree_t *patricia, void (*func)(void *));
86 extern void Destroy_Patricia (patricia_tree_t *patricia, void (*func)(void *));
87
88 extern void patricia_process (patricia_tree_t *patricia, void (*func)(prefix_t *, void *));
89
90 extern const char *prefix_toa (prefix_t * prefix);
91 extern void lookup_then_remove(patricia_tree_t *, const char *);
92 extern patricia_node_t *try_search_exact(patricia_tree_t *, const char *);
93 /* { from demo.c */
94
95 extern patricia_node_t *
96 make_and_lookup (patricia_tree_t *tree, const char *string);
97
98 /* } */
99
100 #define PATRICIA_MAXBITS (sizeof(struct in6_addr) * 8)
101 #define PATRICIA_NBIT(x) (0x80 >> ((x) & 0x7f))
102 #define PATRICIA_NBYTE(x) ((x) >> 3)
103
104 #define PATRICIA_DATA_GET(node, type) (type *)((node)->data)
105 #define PATRICIA_DATA_SET(node, value) ((node)->data = (void *)(value))
106
107 #define PATRICIA_WALK(Xhead, Xnode) \
108 do { \
109 patricia_node_t *Xstack[PATRICIA_MAXBITS+1]; \
110 patricia_node_t **Xsp = Xstack; \
111 patricia_node_t *Xrn = (Xhead); \
112 while ((Xnode = Xrn)) { \
113 if (Xnode->prefix)
114
115 #define PATRICIA_WALK_ALL(Xhead, Xnode) \
116 do { \
117 patricia_node_t *Xstack[PATRICIA_MAXBITS+1]; \
118 patricia_node_t **Xsp = Xstack; \
119 patricia_node_t *Xrn = (Xhead); \
120 while ((Xnode = Xrn)) { \
121 if (1)
122
123 #define PATRICIA_WALK_BREAK { \
124 if (Xsp != Xstack) { \
125 Xrn = *(--Xsp); \
126 } else { \
127 Xrn = (patricia_node_t *) 0; \
128 } \
129 continue; }
130
131 #define PATRICIA_WALK_END \
132 if (Xrn->l) { \
133 if (Xrn->r) { \
134 *Xsp++ = Xrn->r; \
135 } \
136 Xrn = Xrn->l; \
137 } else if (Xrn->r) { \
138 Xrn = Xrn->r; \
139 } else if (Xsp != Xstack) { \
140 Xrn = *(--Xsp); \
141 } else { \
142 Xrn = (patricia_node_t *) 0; \
143 } \
144 } \
145 } while (0)
146
147 #endif /* _PATRICIA_H */

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