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Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00001/*
Sven Eckelmann64afe352011-01-27 10:38:15 +01002 * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00003 *
4 * Marek Lindner, Simon Wunderlich
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA
19 *
20 */
21
22#ifndef _NET_BATMAN_ADV_ORIGINATOR_H_
23#define _NET_BATMAN_ADV_ORIGINATOR_H_
24
Marek Lindner7aadf882011-02-18 12:28:09 +000025#include "hash.h"
26
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000027int originator_init(struct bat_priv *bat_priv);
28void originator_free(struct bat_priv *bat_priv);
29void purge_orig_ref(struct bat_priv *bat_priv);
Marek Lindner7b36e8e2011-02-18 12:28:10 +000030void orig_node_free_ref(struct orig_node *orig_node);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000031struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr);
Marek Lindnera8e7f4b2010-12-12 21:57:10 +000032struct neigh_node *create_neighbor(struct orig_node *orig_node,
33 struct orig_node *orig_neigh_node,
34 uint8_t *neigh,
Marek Lindnere6c10f42011-02-18 12:33:20 +000035 struct hard_iface *if_incoming);
Marek Lindner44524fc2011-02-10 14:33:53 +000036void neigh_node_free_ref(struct neigh_node *neigh_node);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000037int orig_seq_print_text(struct seq_file *seq, void *offset);
Marek Lindnere6c10f42011-02-18 12:33:20 +000038int orig_hash_add_if(struct hard_iface *hard_iface, int max_if_num);
39int orig_hash_del_if(struct hard_iface *hard_iface, int max_if_num);
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000040
41
42/* returns 1 if they are the same originator */
Marek Lindner7aadf882011-02-18 12:28:09 +000043static inline int compare_orig(struct hlist_node *node, void *data2)
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000044{
Marek Lindner7aadf882011-02-18 12:28:09 +000045 void *data1 = container_of(node, struct orig_node, hash_entry);
46
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000047 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
48}
49
50/* hashfunction to choose an entry in a hash table of given size */
51/* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */
52static inline int choose_orig(void *data, int32_t size)
53{
54 unsigned char *key = data;
55 uint32_t hash = 0;
56 size_t i;
57
58 for (i = 0; i < 6; i++) {
59 hash += key[i];
60 hash += (hash << 10);
61 hash ^= (hash >> 6);
62 }
63
64 hash += (hash << 3);
65 hash ^= (hash >> 11);
66 hash += (hash << 15);
67
68 return hash % size;
69}
70
Marek Lindner7aadf882011-02-18 12:28:09 +000071static inline struct orig_node *orig_hash_find(struct bat_priv *bat_priv,
72 void *data)
73{
74 struct hashtable_t *hash = bat_priv->orig_hash;
75 struct hlist_head *head;
76 struct hlist_node *node;
77 struct orig_node *orig_node, *orig_node_tmp = NULL;
78 int index;
79
80 if (!hash)
81 return NULL;
82
83 index = choose_orig(data, hash->size);
84 head = &hash->table[index];
85
86 rcu_read_lock();
87 hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
88 if (!compare_eth(orig_node, data))
89 continue;
90
Marek Lindner7b36e8e2011-02-18 12:28:10 +000091 if (!atomic_inc_not_zero(&orig_node->refcount))
92 continue;
93
Marek Lindner7aadf882011-02-18 12:28:09 +000094 orig_node_tmp = orig_node;
Marek Lindner7aadf882011-02-18 12:28:09 +000095 break;
96 }
97 rcu_read_unlock();
98
99 return orig_node_tmp;
100}
101
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +0000102#endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */