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c6c8fea2 | 1 | /* |
64afe353 | 2 | * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
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 | ||
7aadf889 ML |
25 | #include "hash.h" |
26 | ||
c6c8fea2 SE |
27 | int originator_init(struct bat_priv *bat_priv); |
28 | void originator_free(struct bat_priv *bat_priv); | |
29 | void purge_orig_ref(struct bat_priv *bat_priv); | |
16b1aba8 | 30 | void orig_node_free_ref(struct kref *refcount); |
c6c8fea2 | 31 | struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr); |
a8e7f4bc ML |
32 | struct neigh_node *create_neighbor(struct orig_node *orig_node, |
33 | struct orig_node *orig_neigh_node, | |
34 | uint8_t *neigh, | |
35 | struct batman_if *if_incoming); | |
44524fcd | 36 | void neigh_node_free_ref(struct neigh_node *neigh_node); |
c6c8fea2 SE |
37 | int orig_seq_print_text(struct seq_file *seq, void *offset); |
38 | int orig_hash_add_if(struct batman_if *batman_if, int max_if_num); | |
39 | int orig_hash_del_if(struct batman_if *batman_if, int max_if_num); | |
40 | ||
41 | ||
42 | /* returns 1 if they are the same originator */ | |
7aadf889 | 43 | static inline int compare_orig(struct hlist_node *node, void *data2) |
c6c8fea2 | 44 | { |
7aadf889 ML |
45 | void *data1 = container_of(node, struct orig_node, hash_entry); |
46 | ||
c6c8fea2 SE |
47 | 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 */ | |
52 | static 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 | ||
7aadf889 ML |
71 | static 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 | ||
91 | orig_node_tmp = orig_node; | |
92 | kref_get(&orig_node_tmp->refcount); | |
93 | break; | |
94 | } | |
95 | rcu_read_unlock(); | |
96 | ||
97 | return orig_node_tmp; | |
98 | } | |
99 | ||
c6c8fea2 | 100 | #endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */ |