c90681b850
There are two reasons for this fix: - the result of choose_orig() and vis_choose() is an index and therefore it can't be negative. Hence it is correct to make the return type unsigned too. - sizeof(int) may not be the same on ALL the architectures. Since we plan to use choose_orig() as DHT hash function, we need to guarantee that, given the same argument, the result is the same. Then it is correct to explicitly express the size of the return type (and the second argument). Since the expected length is currently 4, uint32_t is the most convenient choice. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Sven Eckelmann <sven@narfation.org>
96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/*
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* Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*
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*/
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#ifndef _NET_BATMAN_ADV_ORIGINATOR_H_
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#define _NET_BATMAN_ADV_ORIGINATOR_H_
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#include "hash.h"
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int originator_init(struct bat_priv *bat_priv);
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void originator_free(struct bat_priv *bat_priv);
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void purge_orig_ref(struct bat_priv *bat_priv);
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void orig_node_free_ref(struct orig_node *orig_node);
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struct orig_node *get_orig_node(struct bat_priv *bat_priv, const uint8_t *addr);
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struct neigh_node *create_neighbor(struct orig_node *orig_node,
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struct orig_node *orig_neigh_node,
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const uint8_t *neigh,
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struct hard_iface *if_incoming);
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void neigh_node_free_ref(struct neigh_node *neigh_node);
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struct neigh_node *orig_node_get_router(struct orig_node *orig_node);
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int orig_seq_print_text(struct seq_file *seq, void *offset);
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int orig_hash_add_if(struct hard_iface *hard_iface, int max_if_num);
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int orig_hash_del_if(struct hard_iface *hard_iface, int max_if_num);
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/* hashfunction to choose an entry in a hash table of given size */
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/* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */
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static inline uint32_t choose_orig(const void *data, uint32_t size)
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{
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const unsigned char *key = data;
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uint32_t hash = 0;
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size_t i;
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for (i = 0; i < 6; i++) {
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hash += key[i];
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hash += (hash << 10);
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hash ^= (hash >> 6);
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}
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hash += (hash << 3);
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hash ^= (hash >> 11);
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hash += (hash << 15);
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return hash % size;
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}
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static inline struct orig_node *orig_hash_find(struct bat_priv *bat_priv,
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const void *data)
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{
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struct hashtable_t *hash = bat_priv->orig_hash;
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struct hlist_head *head;
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struct hlist_node *node;
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struct orig_node *orig_node, *orig_node_tmp = NULL;
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int index;
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if (!hash)
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return NULL;
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index = choose_orig(data, hash->size);
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head = &hash->table[index];
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rcu_read_lock();
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hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
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if (!compare_eth(orig_node, data))
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continue;
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if (!atomic_inc_not_zero(&orig_node->refcount))
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continue;
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orig_node_tmp = orig_node;
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break;
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}
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rcu_read_unlock();
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return orig_node_tmp;
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}
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#endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */
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