elemental-ircd/libratbox/include/rb_patricia.h

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/*
* $Id: patricia.h 23020 2006-09-01 18:20:19Z androsyn $
* Dave Plonka <plonka@doit.wisc.edu>
*
* This product includes software developed by the University of Michigan,
* Merit Network, Inc., and their contributors.
*
* This file had been called "radix.h" in the MRT sources.
*
* I renamed it to "patricia.h" since it's not an implementation of a general
* radix trie. Also, pulled in various requirements from "mrt.h" and added
* some other things it could be used as a standalone API.
*/
#ifndef _RB_PATRICIA_H
#define _RB_PATRICIA_H
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE !(FALSE)
#endif
#ifndef INET6_ADDRSTRLEN
#define INET6_ADDRSTRLEN 46
#endif
/* typedef unsigned int u_int; */
typedef void (*void_fn_t) ();
#define rb_prefix_touchar(prefix) ((unsigned char *)&(prefix)->add.sin)
#define MAXLINE 1024
#define BIT_TEST(f, b) ((f) & (b))
typedef struct _rb_prefix_t
{
unsigned short family; /* AF_INET | AF_INET6 */
unsigned short bitlen; /* same as mask? */
int ref_count; /* reference count */
union
{
struct in_addr sin;
#ifdef RB_IPV6
struct in6_addr sin6;
#endif /* RB_IPV6 */
}
add;
}
rb_prefix_t;
typedef struct _rb_patricia_node_t
{
unsigned int bit; /* flag if this node used */
rb_prefix_t *prefix; /* who we are in patricia tree */
struct _rb_patricia_node_t *l, *r; /* left and right children */
struct _rb_patricia_node_t *parent; /* may be used */
void *data;
}
rb_patricia_node_t;
typedef struct _rb_patricia_tree_t
{
rb_patricia_node_t *head;
unsigned int maxbits; /* for IP, 32 bit addresses */
int num_active_node; /* for debug purpose */
}
rb_patricia_tree_t;
rb_patricia_node_t *rb_match_ip(rb_patricia_tree_t * tree, struct sockaddr *ip);
rb_patricia_node_t *rb_match_ip_exact(rb_patricia_tree_t * tree, struct sockaddr *ip, unsigned int len);
rb_patricia_node_t *rb_match_string(rb_patricia_tree_t * tree, const char *string);
rb_patricia_node_t *rb_match_exact_string(rb_patricia_tree_t * tree, const char *string);
rb_patricia_node_t *rb_patricia_search_exact(rb_patricia_tree_t * patricia, rb_prefix_t * prefix);
rb_patricia_node_t *rb_patricia_search_best(rb_patricia_tree_t * patricia, rb_prefix_t * prefix);
rb_patricia_node_t *rb_patricia_search_best2(rb_patricia_tree_t * patricia,
rb_prefix_t * prefix, int inclusive);
rb_patricia_node_t *rb_patricia_lookup(rb_patricia_tree_t * patricia, rb_prefix_t * prefix);
void rb_patricia_remove(rb_patricia_tree_t * patricia, rb_patricia_node_t * node);
rb_patricia_tree_t *rb_new_patricia(int maxbits);
void rb_clear_patricia(rb_patricia_tree_t * patricia, void_fn_t func);
void rb_destroy_patricia(rb_patricia_tree_t * patricia, void_fn_t func);
void rb_patricia_process(rb_patricia_tree_t * patricia, void_fn_t func);
void rb_init_patricia(void);
#if 0
rb_prefix_t *ascii2prefix(int family, char *string);
#endif
rb_patricia_node_t *make_and_lookup(rb_patricia_tree_t * tree, const char *string);
rb_patricia_node_t *make_and_lookup_ip(rb_patricia_tree_t * tree, struct sockaddr *, int bitlen);
#define RB_PATRICIA_MAXBITS 128
#define RB_PATRICIA_NBIT(x) (0x80 >> ((x) & 0x7f))
#define RB_PATRICIA_NBYTE(x) ((x) >> 3)
#define RB_PATRICIA_DATA_GET(node, type) (type *)((node)->data)
#define RB_PATRICIA_DATA_SET(node, value) ((node)->data = (void *)(value))
#define RB_PATRICIA_WALK(Xhead, Xnode) \
do { \
rb_patricia_node_t *Xstack[RB_PATRICIA_MAXBITS+1]; \
rb_patricia_node_t **Xsp = Xstack; \
rb_patricia_node_t *Xrn = (Xhead); \
while ((Xnode = Xrn)) { \
if (Xnode->prefix)
#define RB_PATRICIA_WALK_ALL(Xhead, Xnode) \
do { \
rb_patricia_node_t *Xstack[RB_PATRICIA_MAXBITS+1]; \
rb_patricia_node_t **Xsp = Xstack; \
rb_patricia_node_t *Xrn = (Xhead); \
while ((Xnode = Xrn)) { \
if (1)
#define RB_PATRICIA_WALK_BREAK { \
if (Xsp != Xstack) { \
Xrn = *(--Xsp); \
} else { \
Xrn = (rb_patricia_node_t *) 0; \
} \
continue; }
#define RB_PATRICIA_WALK_END \
if (Xrn->l) { \
if (Xrn->r) { \
*Xsp++ = Xrn->r; \
} \
Xrn = Xrn->l; \
} else if (Xrn->r) { \
Xrn = Xrn->r; \
} else if (Xsp != Xstack) { \
Xrn = *(--Xsp); \
} else { \
Xrn = (rb_patricia_node_t *) 0; \
} \
} \
} while (0)
#endif /* _RB_PATRICIA_H */