From 0e1e632f70b74cf111f08175ab3634db2f962579 Mon Sep 17 00:00:00 2001
From: Maria Matejka <mq@ucw.cz>
Date: Thu, 31 Mar 2022 19:00:00 +0200
Subject: FIB is a data structure generic enough to be in lib

---
 nest/route.h | 107 +----------------------------------------------------------
 1 file changed, 1 insertion(+), 106 deletions(-)

(limited to 'nest')

diff --git a/nest/route.h b/nest/route.h
index da8c723f..c6d30148 100644
--- a/nest/route.h
+++ b/nest/route.h
@@ -14,6 +14,7 @@
 #include "lib/resource.h"
 #include "lib/net.h"
 #include "lib/type.h"
+#include "lib/fib.h"
 
 struct ea_list;
 struct protocol;
@@ -21,117 +22,11 @@ struct proto;
 struct rte_src;
 struct symbol;
 struct timer;
-struct fib;
 struct filter;
 struct f_trie;
 struct f_trie_walk_state;
 struct cli;
 
-/*
- *	Generic data structure for storing network prefixes. Also used
- *	for the master routing table. Currently implemented as a hash
- *	table.
- *
- *	Available operations:
- *		- insertion of new entry
- *		- deletion of entry
- *		- searching for entry by network prefix
- *		- asynchronous retrieval of fib contents
- */
-
-struct fib_node {
-  struct fib_node *next;		/* Next in hash chain */
-  struct fib_iterator *readers;		/* List of readers of this node */
-  net_addr addr[0];
-};
-
-struct fib_iterator {			/* See lib/slists.h for an explanation */
-  struct fib_iterator *prev, *next;	/* Must be synced with struct fib_node! */
-  byte efef;				/* 0xff to distinguish between iterator and node */
-  byte pad[3];
-  struct fib_node *node;		/* Or NULL if freshly merged */
-  uint hash;
-};
-
-typedef void (*fib_init_fn)(struct fib *, void *);
-
-struct fib {
-  pool *fib_pool;			/* Pool holding all our data */
-  slab *fib_slab;			/* Slab holding all fib nodes */
-  struct fib_node **hash_table;		/* Node hash table */
-  uint hash_size;			/* Number of hash table entries (a power of two) */
-  uint hash_order;			/* Binary logarithm of hash_size */
-  uint hash_shift;			/* 32 - hash_order */
-  uint addr_type;			/* Type of address data stored in fib (NET_*) */
-  uint node_size;			/* FIB node size, 0 for nonuniform */
-  uint node_offset;			/* Offset of fib_node struct inside of user data */
-  uint entries;				/* Number of entries */
-  uint entries_min, entries_max;	/* Entry count limits (else start rehashing) */
-  fib_init_fn init;			/* Constructor */
-};
-
-static inline void * fib_node_to_user(struct fib *f, struct fib_node *e)
-{ return e ? (void *) ((char *) e - f->node_offset) : NULL; }
-
-static inline struct fib_node * fib_user_to_node(struct fib *f, void *e)
-{ return e ? (void *) ((char *) e + f->node_offset) : NULL; }
-
-void fib_init(struct fib *f, pool *p, uint addr_type, uint node_size, uint node_offset, uint hash_order, fib_init_fn init);
-void *fib_find(struct fib *, const net_addr *);	/* Find or return NULL if doesn't exist */
-void *fib_get_chain(struct fib *f, const net_addr *a); /* Find first node in linked list from hash table */
-void *fib_get(struct fib *, const net_addr *);	/* Find or create new if nonexistent */
-void *fib_route(struct fib *, const net_addr *); /* Longest-match routing lookup */
-void fib_delete(struct fib *, void *);	/* Remove fib entry */
-void fib_free(struct fib *);		/* Destroy the fib */
-void fib_check(struct fib *);		/* Consistency check for debugging */
-
-void fit_init(struct fib_iterator *, struct fib *); /* Internal functions, don't call */
-struct fib_node *fit_get(struct fib *, struct fib_iterator *);
-void fit_put(struct fib_iterator *, struct fib_node *);
-void fit_put_next(struct fib *f, struct fib_iterator *i, struct fib_node *n, uint hpos);
-void fit_put_end(struct fib_iterator *i);
-void fit_copy(struct fib *f, struct fib_iterator *dst, struct fib_iterator *src);
-
-
-#define FIB_WALK(fib, type, z) do {				\
-	struct fib_node *fn_, **ff_ = (fib)->hash_table;	\
-	uint count_ = (fib)->hash_size;				\
-	type *z;						\
-	while (count_--)					\
-	  for (fn_ = *ff_++; z = fib_node_to_user(fib, fn_); fn_=fn_->next)
-
-#define FIB_WALK_END } while (0)
-
-#define FIB_ITERATE_INIT(it, fib) fit_init(it, fib)
-
-#define FIB_ITERATE_START(fib, it, type, z) do {		\
-	struct fib_node *fn_ = fit_get(fib, it);		\
-	uint count_ = (fib)->hash_size;				\
-	uint hpos_ = (it)->hash;				\
-	type *z;						\
-	for(;;) {						\
-	  if (!fn_)						\
-	    {							\
-	       if (++hpos_ >= count_)				\
-		 break;						\
-	       fn_ = (fib)->hash_table[hpos_];			\
-	       continue;					\
-	    }							\
-	  z = fib_node_to_user(fib, fn_);
-
-#define FIB_ITERATE_END fn_ = fn_->next; } } while(0)
-
-#define FIB_ITERATE_PUT(it) fit_put(it, fn_)
-
-#define FIB_ITERATE_PUT_NEXT(it, fib) fit_put_next(fib, it, fn_, hpos_)
-
-#define FIB_ITERATE_PUT_END(it) fit_put_end(it)
-
-#define FIB_ITERATE_UNLINK(it, fib) fit_get(fib, it)
-
-#define FIB_ITERATE_COPY(dst, src, fib) fit_copy(fib, dst, src)
-
-
 /*
  *	Master Routing Tables. Generally speaking, each of them contains a FIB
  *	with each entry pointing to a list of route entries representing routes
-- 
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