libratbox/include/rb_patricia.h

   1 /*
   2  * Dave Plonka <plonka@doit.wisc.edu>
   3  *
   4  * This product includes software developed by the University of Michigan,
   5  * Merit Network, Inc., and their contributors.
   6  *
   7  * This file had been called "radix.h" in the MRT sources.
   8  *
   9  * I renamed it to "patricia.h" since it's not an implementation of a general
  10  * radix trie.  Also, pulled in various requirements from "mrt.h" and added
  11  * some other things it could be used as a standalone API.
  12  */
  13
  14 #ifndef _RB_PATRICIA_H
  15 #define _RB_PATRICIA_H
  16
  17 #ifndef FALSE
  18 #define FALSE 0
  19 #endif
  20 #ifndef TRUE
  21 #define TRUE !(FALSE)
  22 #endif
  23 #ifndef INET6_ADDRSTRLEN
  24 #define INET6_ADDRSTRLEN 46
  25 #endif
  26
  27 /* typedef unsigned int u_int; */
  28 #define rb_prefix_touchar(prefix) ((unsigned char *)&(prefix)->add.sin)
  29 #define MAXLINE 1024
  30 #define BIT_TEST(f, b)  ((f) & (b))
  31
  32 typedef struct _rb_prefix_t
  33 {
  34         unsigned short family;  /* AF_INET | AF_INET6 */
  35         unsigned short bitlen;  /* same as mask? */
  36         int ref_count;          /* reference count */
  37         union
  38         {
  39                 struct in_addr sin;
  40 #ifdef RB_IPV6
  41                 struct in6_addr sin6;
  42 #endif                          /* RB_IPV6 */
  43         }
  44         add;
  45 }
  46 rb_prefix_t;
  47
  48
  49 typedef struct _rb_patricia_node_t
  50 {
  51         unsigned int bit;       /* flag if this node used */
  52         rb_prefix_t *prefix;    /* who we are in patricia tree */
  53         struct _rb_patricia_node_t *l, *r;      /* left and right children */
  54         struct _rb_patricia_node_t *parent;     /* may be used */
  55         void *data;
  56 }
  57 rb_patricia_node_t;
  58
  59 typedef struct _rb_patricia_tree_t
  60 {
  61         rb_patricia_node_t *head;
  62         unsigned int maxbits;   /* for IP, 32 bit addresses */
  63         int num_active_node;    /* for debug purpose */
  64 }
  65 rb_patricia_tree_t;
  66
  67
  68 rb_patricia_node_t *rb_match_ip(rb_patricia_tree_t *tree, struct sockaddr *ip);
  69 rb_patricia_node_t *rb_match_ip_exact(rb_patricia_tree_t *tree, struct sockaddr *ip,
  70                                       unsigned int len);
  71 rb_patricia_node_t *rb_match_string(rb_patricia_tree_t *tree, const char *string);
  72 rb_patricia_node_t *rb_match_exact_string(rb_patricia_tree_t *tree, const char *string);
  73 rb_patricia_node_t *rb_patricia_search_exact(rb_patricia_tree_t *patricia, rb_prefix_t *prefix);
  74 rb_patricia_node_t *rb_patricia_search_best(rb_patricia_tree_t *patricia, rb_prefix_t *prefix);
  75 rb_patricia_node_t *rb_patricia_search_best2(rb_patricia_tree_t *patricia,
  76                                              rb_prefix_t *prefix, int inclusive);
  77 rb_patricia_node_t *rb_patricia_lookup(rb_patricia_tree_t *patricia, rb_prefix_t *prefix);
  78
  79 void rb_patricia_remove(rb_patricia_tree_t *patricia, rb_patricia_node_t *node);
  80 rb_patricia_tree_t *rb_new_patricia(int maxbits);
  81 void rb_clear_patricia(rb_patricia_tree_t *patricia, void (*func) (void *));
  82 void rb_destroy_patricia(rb_patricia_tree_t *patricia, void (*func) (void *));
  83 void rb_patricia_process(rb_patricia_tree_t *patricia, void (*func) (rb_prefix_t *, void *));
  84 void rb_init_patricia(void);
  85
  86
  87 #if 0
  88 rb_prefix_t *ascii2prefix(int family, char *string);
  89 #endif
  90 rb_patricia_node_t *make_and_lookup(rb_patricia_tree_t *tree, const char *string);
  91 rb_patricia_node_t *make_and_lookup_ip(rb_patricia_tree_t *tree, struct sockaddr *, int bitlen);
  92
  93
  94 #define RB_PATRICIA_MAXBITS 128
  95 #define RB_PATRICIA_NBIT(x)        (0x80 >> ((x) & 0x7f))
  96 #define RB_PATRICIA_NBYTE(x)       ((x) >> 3)
  97
  98 #define RB_PATRICIA_DATA_GET(node, type) (type *)((node)->data)
  99 #define RB_PATRICIA_DATA_SET(node, value) ((node)->data = (void *)(value))
 100
 101 #define RB_PATRICIA_WALK(Xhead, Xnode) \
 102     do { \
 103         rb_patricia_node_t *Xstack[RB_PATRICIA_MAXBITS+1]; \
 104         rb_patricia_node_t **Xsp = Xstack; \
 105         rb_patricia_node_t *Xrn = (Xhead); \
 106         while ((Xnode = Xrn)) { \
 107             if (Xnode->prefix)
 108
 109 #define RB_PATRICIA_WALK_ALL(Xhead, Xnode) \
 110 do { \
 111         rb_patricia_node_t *Xstack[RB_PATRICIA_MAXBITS+1]; \
 112         rb_patricia_node_t **Xsp = Xstack; \
 113         rb_patricia_node_t *Xrn = (Xhead); \
 114         while ((Xnode = Xrn)) { \
 115             if (1)
 116
 117 #define RB_PATRICIA_WALK_BREAK { \
 118             if (Xsp != Xstack) { \
 119                 Xrn = *(--Xsp); \
 120              } else { \
 121                 Xrn = (rb_patricia_node_t *) 0; \
 122             } \
 123             continue; }
 124
 125 #define RB_PATRICIA_WALK_END \
 126             if (Xrn->l) { \
 127                 if (Xrn->r) { \
 128                     *Xsp++ = Xrn->r; \
 129                 } \
 130                 Xrn = Xrn->l; \
 131             } else if (Xrn->r) { \
 132                 Xrn = Xrn->r; \
 133             } else if (Xsp != Xstack) { \
 134                 Xrn = *(--Xsp); \
 135             } else { \
 136                 Xrn = (rb_patricia_node_t *) 0; \
 137             } \
 138         } \
 139     } while (0)
 140
 141 #endif /* _RB_PATRICIA_H */