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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 | ||
56303d34 SE |
25 | int batadv_originator_init(struct batadv_priv *bat_priv); |
26 | void batadv_originator_free(struct batadv_priv *bat_priv); | |
27 | void batadv_purge_orig_ref(struct batadv_priv *bat_priv); | |
28 | void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node); | |
72822225 | 29 | void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node); |
56303d34 SE |
30 | struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv, |
31 | const uint8_t *addr); | |
32 | struct batadv_neigh_node * | |
33 | batadv_neigh_node_new(struct batadv_hard_iface *hard_iface, | |
863dd7a8 | 34 | const uint8_t *neigh_addr); |
56303d34 SE |
35 | void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node); |
36 | struct batadv_neigh_node * | |
37 | batadv_orig_node_get_router(struct batadv_orig_node *orig_node); | |
7d211efc | 38 | int batadv_orig_seq_print_text(struct seq_file *seq, void *offset); |
56303d34 SE |
39 | int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, |
40 | int max_if_num); | |
41 | int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface, | |
42 | int max_if_num); | |
7ea7b4a1 AQ |
43 | struct batadv_orig_node_vlan * |
44 | batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node, | |
45 | unsigned short vid); | |
46 | struct batadv_orig_node_vlan * | |
47 | batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node, | |
48 | unsigned short vid); | |
49 | void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan); | |
c6c8fea2 SE |
50 | |
51 | ||
9cfc7bd6 SE |
52 | /* hashfunction to choose an entry in a hash table of given size |
53 | * hash algorithm from http://en.wikipedia.org/wiki/Hash_table | |
54 | */ | |
da641193 | 55 | static inline uint32_t batadv_choose_orig(const void *data, uint32_t size) |
c6c8fea2 | 56 | { |
747e4221 | 57 | const unsigned char *key = data; |
c6c8fea2 SE |
58 | uint32_t hash = 0; |
59 | size_t i; | |
60 | ||
61 | for (i = 0; i < 6; i++) { | |
62 | hash += key[i]; | |
63 | hash += (hash << 10); | |
64 | hash ^= (hash >> 6); | |
65 | } | |
66 | ||
67 | hash += (hash << 3); | |
68 | hash ^= (hash >> 11); | |
69 | hash += (hash << 15); | |
70 | ||
71 | return hash % size; | |
72 | } | |
73 | ||
56303d34 SE |
74 | static inline struct batadv_orig_node * |
75 | batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data) | |
7aadf889 | 76 | { |
5bf74e9c | 77 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
7aadf889 | 78 | struct hlist_head *head; |
56303d34 | 79 | struct batadv_orig_node *orig_node, *orig_node_tmp = NULL; |
7aadf889 ML |
80 | int index; |
81 | ||
82 | if (!hash) | |
83 | return NULL; | |
84 | ||
da641193 | 85 | index = batadv_choose_orig(data, hash->size); |
7aadf889 ML |
86 | head = &hash->table[index]; |
87 | ||
88 | rcu_read_lock(); | |
b67bfe0d | 89 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
1eda58bf | 90 | if (!batadv_compare_eth(orig_node, data)) |
7aadf889 ML |
91 | continue; |
92 | ||
7b36e8ee ML |
93 | if (!atomic_inc_not_zero(&orig_node->refcount)) |
94 | continue; | |
95 | ||
7aadf889 | 96 | orig_node_tmp = orig_node; |
7aadf889 ML |
97 | break; |
98 | } | |
99 | rcu_read_unlock(); | |
100 | ||
101 | return orig_node_tmp; | |
102 | } | |
103 | ||
c6c8fea2 | 104 | #endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */ |