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Real bucket lists.

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This commit is contained in:
Martin Mares 2000-04-12 14:09:26 +00:00
parent a2d157463a
commit c2b28c9910
2 changed files with 43 additions and 15 deletions
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38
proto/bgp/attrs.c
View file

@ -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);
}

20
proto/bgp/bgp.h
View file

@ -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