| /* Copyright (C) 2007-2013 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 batadv_originator_init(struct batadv_priv *bat_priv); |
| void batadv_originator_free(struct batadv_priv *bat_priv); |
| void batadv_purge_orig_ref(struct batadv_priv *bat_priv); |
| void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node); |
| struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv, |
| const uint8_t *addr); |
| struct batadv_neigh_node * |
| batadv_neigh_node_new(struct batadv_hard_iface *hard_iface, |
| const uint8_t *neigh_addr, uint32_t seqno); |
| void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node); |
| struct batadv_neigh_node * |
| batadv_orig_node_get_router(struct batadv_orig_node *orig_node); |
| int batadv_orig_seq_print_text(struct seq_file *seq, void *offset); |
| int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, |
| int max_if_num); |
| int batadv_orig_hash_del_if(struct batadv_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 uint32_t batadv_choose_orig(const void *data, uint32_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 batadv_orig_node * |
| batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data) |
| { |
| struct batadv_hashtable *hash = bat_priv->orig_hash; |
| struct hlist_head *head; |
| struct hlist_node *node; |
| struct batadv_orig_node *orig_node, *orig_node_tmp = NULL; |
| int index; |
| |
| if (!hash) |
| return NULL; |
| |
| index = batadv_choose_orig(data, hash->size); |
| head = &hash->table[index]; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { |
| if (!batadv_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_ */ |