96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/*
|
|
* Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
|
|
*
|
|
* Marek Lindner, Simon Wunderlich
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA
|
|
*
|
|
*/
|
|
|
|
#ifndef _NET_BATMAN_ADV_ORIGINATOR_H_
|
|
#define _NET_BATMAN_ADV_ORIGINATOR_H_
|
|
|
|
#include "hash.h"
|
|
|
|
int originator_init(struct bat_priv *bat_priv);
|
|
void originator_free(struct bat_priv *bat_priv);
|
|
void purge_orig_ref(struct bat_priv *bat_priv);
|
|
void orig_node_free_ref(struct orig_node *orig_node);
|
|
struct orig_node *get_orig_node(struct bat_priv *bat_priv, const uint8_t *addr);
|
|
struct neigh_node *create_neighbor(struct orig_node *orig_node,
|
|
struct orig_node *orig_neigh_node,
|
|
const uint8_t *neigh,
|
|
struct hard_iface *if_incoming);
|
|
void neigh_node_free_ref(struct neigh_node *neigh_node);
|
|
struct neigh_node *orig_node_get_router(struct orig_node *orig_node);
|
|
int orig_seq_print_text(struct seq_file *seq, void *offset);
|
|
int orig_hash_add_if(struct hard_iface *hard_iface, int max_if_num);
|
|
int orig_hash_del_if(struct hard_iface *hard_iface, int max_if_num);
|
|
|
|
|
|
/* hashfunction to choose an entry in a hash table of given size */
|
|
/* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */
|
|
static inline int choose_orig(const void *data, int32_t size)
|
|
{
|
|
const unsigned char *key = data;
|
|
uint32_t hash = 0;
|
|
size_t i;
|
|
|
|
for (i = 0; i < 6; i++) {
|
|
hash += key[i];
|
|
hash += (hash << 10);
|
|
hash ^= (hash >> 6);
|
|
}
|
|
|
|
hash += (hash << 3);
|
|
hash ^= (hash >> 11);
|
|
hash += (hash << 15);
|
|
|
|
return hash % size;
|
|
}
|
|
|
|
static inline struct orig_node *orig_hash_find(struct bat_priv *bat_priv,
|
|
const void *data)
|
|
{
|
|
struct hashtable_t *hash = bat_priv->orig_hash;
|
|
struct hlist_head *head;
|
|
struct hlist_node *node;
|
|
struct orig_node *orig_node, *orig_node_tmp = NULL;
|
|
int index;
|
|
|
|
if (!hash)
|
|
return NULL;
|
|
|
|
index = choose_orig(data, hash->size);
|
|
head = &hash->table[index];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
|
|
if (!compare_eth(orig_node, data))
|
|
continue;
|
|
|
|
if (!atomic_inc_not_zero(&orig_node->refcount))
|
|
continue;
|
|
|
|
orig_node_tmp = orig_node;
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return orig_node_tmp;
|
|
}
|
|
|
|
#endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */
|