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0b873931 | 1 | /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
2 | * |
3 | * Marek Lindner, Simon Wunderlich | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
c6c8fea2 SE |
18 | */ |
19 | ||
20 | #ifndef _NET_BATMAN_ADV_ORIGINATOR_H_ | |
21 | #define _NET_BATMAN_ADV_ORIGINATOR_H_ | |
22 | ||
7aadf889 ML |
23 | #include "hash.h" |
24 | ||
bbad0a5e | 25 | int batadv_compare_orig(const struct hlist_node *node, const void *data2); |
56303d34 SE |
26 | int batadv_originator_init(struct batadv_priv *bat_priv); |
27 | void batadv_originator_free(struct batadv_priv *bat_priv); | |
28 | void batadv_purge_orig_ref(struct batadv_priv *bat_priv); | |
29 | void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node); | |
72822225 | 30 | void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node); |
bbad0a5e | 31 | struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, |
56303d34 SE |
32 | const uint8_t *addr); |
33 | struct batadv_neigh_node * | |
34 | batadv_neigh_node_new(struct batadv_hard_iface *hard_iface, | |
0538f759 AQ |
35 | const uint8_t *neigh_addr, |
36 | struct batadv_orig_node *orig_node); | |
56303d34 SE |
37 | void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node); |
38 | struct batadv_neigh_node * | |
39 | batadv_orig_node_get_router(struct batadv_orig_node *orig_node); | |
7d211efc | 40 | int batadv_orig_seq_print_text(struct seq_file *seq, void *offset); |
56303d34 SE |
41 | int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, |
42 | int max_if_num); | |
43 | int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface, | |
44 | int max_if_num); | |
7ea7b4a1 AQ |
45 | struct batadv_orig_node_vlan * |
46 | batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node, | |
47 | unsigned short vid); | |
48 | struct batadv_orig_node_vlan * | |
49 | batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node, | |
50 | unsigned short vid); | |
51 | void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan); | |
c6c8fea2 SE |
52 | |
53 | ||
9cfc7bd6 SE |
54 | /* hashfunction to choose an entry in a hash table of given size |
55 | * hash algorithm from http://en.wikipedia.org/wiki/Hash_table | |
56 | */ | |
da641193 | 57 | static inline uint32_t batadv_choose_orig(const void *data, uint32_t size) |
c6c8fea2 | 58 | { |
747e4221 | 59 | const unsigned char *key = data; |
c6c8fea2 SE |
60 | uint32_t hash = 0; |
61 | size_t i; | |
62 | ||
63 | for (i = 0; i < 6; i++) { | |
64 | hash += key[i]; | |
65 | hash += (hash << 10); | |
66 | hash ^= (hash >> 6); | |
67 | } | |
68 | ||
69 | hash += (hash << 3); | |
70 | hash ^= (hash >> 11); | |
71 | hash += (hash << 15); | |
72 | ||
73 | return hash % size; | |
74 | } | |
75 | ||
56303d34 SE |
76 | static inline struct batadv_orig_node * |
77 | batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data) | |
7aadf889 | 78 | { |
5bf74e9c | 79 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
7aadf889 | 80 | struct hlist_head *head; |
56303d34 | 81 | struct batadv_orig_node *orig_node, *orig_node_tmp = NULL; |
7aadf889 ML |
82 | int index; |
83 | ||
84 | if (!hash) | |
85 | return NULL; | |
86 | ||
da641193 | 87 | index = batadv_choose_orig(data, hash->size); |
7aadf889 ML |
88 | head = &hash->table[index]; |
89 | ||
90 | rcu_read_lock(); | |
b67bfe0d | 91 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
1eda58bf | 92 | if (!batadv_compare_eth(orig_node, data)) |
7aadf889 ML |
93 | continue; |
94 | ||
7b36e8ee ML |
95 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
96 | continue; | |
97 | ||
7aadf889 | 98 | orig_node_tmp = orig_node; |
7aadf889 ML |
99 | break; |
100 | } | |
101 | rcu_read_unlock(); | |
102 | ||
103 | return orig_node_tmp; | |
104 | } | |
105 | ||
c6c8fea2 | 106 | #endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */ |