From c2b28c99103a643dd29ad48152999d6dac7722fe Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Wed, 12 Apr 2000 14:09:26 +0000
Subject: Real bucket lists.

---
 proto/bgp/attrs.c | 38 ++++++++++++++++++++++++--------------
 proto/bgp/bgp.h   | 20 +++++++++++++++++++-
 2 files changed, 43 insertions(+), 15 deletions(-)

(limited to 'proto')

diff --git a/proto/bgp/attrs.c b/proto/bgp/attrs.c
index 350123a..e42a6ea 100644
--- a/proto/bgp/attrs.c
+++ b/proto/bgp/attrs.c
@@ -21,12 +21,6 @@
 
 static int bgp_mandatory_attrs[] = { BA_ORIGIN, BA_AS_PATH, BA_NEXT_HOP };
 
-struct bgp_bucket {
-  struct bgp_bucket *next;
-  unsigned hash;
-  ea_list eattrs[0];
-};
-
 struct attr_desc {
   char *name;				/* FIXME: Use the same names as in filters */
   int expected_length;
@@ -38,6 +32,13 @@ struct attr_desc {
 
 extern struct attr_desc bgp_attr_table[];
 
+static void
+bgp_init_prefix(struct fib_node *N)
+{
+  struct bgp_prefix *p = (struct bgp_prefix *) N;
+  /* FIXME */
+}
+
 static void
 bgp_normalize_set(u32 *dest, u32 *src, unsigned cnt)
 {
@@ -48,7 +49,7 @@ bgp_normalize_set(u32 *dest, u32 *src, unsigned cnt)
 static void
 bgp_rehash_buckets(struct bgp_proto *p)
 {
-  struct bgp_bucket **old = p->bucket_table;
+  struct bgp_bucket **old = p->bucket_hash;
   struct bgp_bucket **new;
   unsigned oldn = p->hash_size;
   unsigned i, e, mask;
@@ -59,14 +60,17 @@ bgp_rehash_buckets(struct bgp_proto *p)
   p->hash_limit *= 4;
   if (p->hash_limit >= 65536)
     p->hash_limit = ~0;
-  new = p->bucket_table = mb_allocz(p->p.pool, p->hash_size * sizeof(struct bgp_bucket *));
+  new = p->bucket_hash = mb_allocz(p->p.pool, p->hash_size * sizeof(struct bgp_bucket *));
   mask = p->hash_size - 1;
   for (i=0; i<oldn; i++)
     while (b = old[i])
       {
-	old[i] = b->next;
+	old[i] = b->hash_next;
 	e = b->hash & mask;
-	b->next = new[e];
+	b->hash_next = new[e];
+	if (b->hash_next)
+	  b->hash_next->hash_prev = b;
+	b->hash_prev = NULL;
 	new[e] = b;
       }
   mb_free(old);
@@ -93,8 +97,11 @@ bgp_new_bucket(struct bgp_proto *p, ea_list *new, unsigned hash)
 
   /* Create the bucket and hash it */
   b = mb_alloc(p->p.pool, size);
-  b->next = p->bucket_table[index];
-  p->bucket_table[index] = b;
+  b->hash_next = p->bucket_hash[index];
+  if (b->hash_next)
+    b->hash_next->hash_prev = b;
+  p->bucket_hash[index] = b;
+  b->hash_prev = NULL;
   b->hash = hash;
   memcpy(b->eattrs, new, ea_size);
   dest = ((byte *)b->eattrs) + ea_size_aligned;
@@ -177,7 +184,7 @@ bgp_get_bucket(struct bgp_proto *p, ea_list *old, ea_list *tmp)
 
   /* Hash */
   hash = ea_hash(new);
-  for(b=p->bucket_table[hash & (p->hash_size - 1)]; b; b=b->next)
+  for(b=p->bucket_hash[hash & (p->hash_size - 1)]; b; b=b->hash_next)
     if (b->hash == hash && ea_same(b->eattrs, new))
       {
 	DBG("Found bucket.\n");
@@ -688,5 +695,8 @@ bgp_attr_init(struct bgp_proto *p)
 {
   p->hash_size = 256;
   p->hash_limit = p->hash_size * 4;
-  p->bucket_table = mb_allocz(p->p.pool, p->hash_size * sizeof(struct bgp_bucket *));
+  p->bucket_hash = mb_allocz(p->p.pool, p->hash_size * sizeof(struct bgp_bucket *));
+  init_list(&p->bucket_queue);
+  p->withdraw_bucket = NULL;
+  fib_init(&p->prefix_fib, p->p.pool, sizeof(struct bgp_prefix), 0, bgp_init_prefix);
 }
diff --git a/proto/bgp/bgp.h b/proto/bgp/bgp.h
index 78bb426..965196b 100644
--- a/proto/bgp/bgp.h
+++ b/proto/bgp/bgp.h
@@ -9,6 +9,8 @@
 #ifndef _BIRD_BGP_H_
 #define _BIRD_BGP_H_
 
+#include "nest/route.h"
+
 struct linpool;
 struct eattr;
 
@@ -53,8 +55,24 @@ struct bgp_proto {
   ip_addr next_hop;			/* Either the peer or multihop_via */
   struct neighbor *neigh;		/* Neighbor entry corresponding to next_hop */
   ip_addr local_addr;			/* Address of the local end of the link to next_hop */
-  struct bgp_bucket **bucket_table;	/* Hash table of attribute buckets */
+  struct bgp_bucket **bucket_hash;	/* Hash table of attribute buckets */
   unsigned int hash_size, hash_count, hash_limit;
+  struct fib prefix_fib;		/* Prefixes to be sent */
+  list bucket_queue;			/* Queue of buckets to send */
+  struct bgp_bucket *withdraw_bucket;	/* Withdrawn routes */
+};
+
+struct bgp_prefix {
+  struct fib_node n;			/* Node in prefix fib */
+  node bucket_node;			/* Node in per-bucket list */
+};
+
+struct bgp_bucket {
+  struct bgp_bucket *hash_next, *hash_prev;	/* Node in bucket hash table */
+  node send_node;			/* Node in send queue */
+  unsigned hash;			/* Hash over extended attributes */
+  list prefixes;			/* Prefixes in this buckets */
+  ea_list eattrs[0];			/* Per-bucket extended attributes */
 };
 
 #define BGP_PORT		179
-- 
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