net/batman-adv/originator.h

   1 /* Copyright (C) 2007-2016  B.A.T.M.A.N. contributors:
   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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef _NET_BATMAN_ADV_ORIGINATOR_H_
  19 #define _NET_BATMAN_ADV_ORIGINATOR_H_
  20
  21 #include "main.h"
  22
  23 #include <linux/compiler.h>
  24 #include <linux/if_ether.h>
  25 #include <linux/jhash.h>
  26 #include <linux/kref.h>
  27 #include <linux/rculist.h>
  28 #include <linux/rcupdate.h>
  29 #include <linux/stddef.h>
  30 #include <linux/types.h>
  31
  32 #include "hash.h"
  33
  34 struct seq_file;
  35
  36 int batadv_compare_orig(const struct hlist_node *node, const void *data2);
  37 int batadv_originator_init(struct batadv_priv *bat_priv);
  38 void batadv_originator_free(struct batadv_priv *bat_priv);
  39 void batadv_purge_orig_ref(struct batadv_priv *bat_priv);
  40 void batadv_orig_node_put(struct batadv_orig_node *orig_node);
  41 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
  42                                               const u8 *addr);
  43 struct batadv_hardif_neigh_node *
  44 batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface,
  45                         const u8 *neigh_addr);
  46 void
  47 batadv_hardif_neigh_put(struct batadv_hardif_neigh_node *hardif_neigh);
  48 struct batadv_neigh_node *
  49 batadv_neigh_node_new(struct batadv_orig_node *orig_node,
  50                       struct batadv_hard_iface *hard_iface,
  51                       const u8 *neigh_addr);
  52 void batadv_neigh_node_put(struct batadv_neigh_node *neigh_node);
  53 struct batadv_neigh_node *
  54 batadv_orig_router_get(struct batadv_orig_node *orig_node,
  55                        const struct batadv_hard_iface *if_outgoing);
  56 struct batadv_neigh_ifinfo *
  57 batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
  58                         struct batadv_hard_iface *if_outgoing);
  59 struct batadv_neigh_ifinfo *
  60 batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh,
  61                         struct batadv_hard_iface *if_outgoing);
  62 void batadv_neigh_ifinfo_put(struct batadv_neigh_ifinfo *neigh_ifinfo);
  63
  64 int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset);
  65
  66 struct batadv_orig_ifinfo *
  67 batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
  68                        struct batadv_hard_iface *if_outgoing);
  69 struct batadv_orig_ifinfo *
  70 batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
  71                        struct batadv_hard_iface *if_outgoing);
  72 void batadv_orig_ifinfo_put(struct batadv_orig_ifinfo *orig_ifinfo);
  73
  74 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset);
  75 int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset);
  76 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
  77                             int max_if_num);
  78 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
  79                             int max_if_num);
  80 struct batadv_orig_node_vlan *
  81 batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
  82                           unsigned short vid);
  83 struct batadv_orig_node_vlan *
  84 batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
  85                           unsigned short vid);
  86 void batadv_orig_node_vlan_put(struct batadv_orig_node_vlan *orig_vlan);
  87
  88 /* hashfunction to choose an entry in a hash table of given size
  89  * hash algorithm from http://en.wikipedia.org/wiki/Hash_table
  90  */
  91 static inline u32 batadv_choose_orig(const void *data, u32 size)
  92 {
  93         u32 hash = 0;
  94
  95         hash = jhash(data, ETH_ALEN, hash);
  96         return hash % size;
  97 }
  98
  99 static inline struct batadv_orig_node *
 100 batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data)
 101 {
 102         struct batadv_hashtable *hash = bat_priv->orig_hash;
 103         struct hlist_head *head;
 104         struct batadv_orig_node *orig_node, *orig_node_tmp = NULL;
 105         int index;
 106
 107         if (!hash)
 108                 return NULL;
 109
 110         index = batadv_choose_orig(data, hash->size);
 111         head = &hash->table[index];
 112
 113         rcu_read_lock();
 114         hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 115                 if (!batadv_compare_eth(orig_node, data))
 116                         continue;
 117
 118                 if (!kref_get_unless_zero(&orig_node->refcount))
 119                         continue;
 120
 121                 orig_node_tmp = orig_node;
 122                 break;
 123         }
 124         rcu_read_unlock();
 125
 126         return orig_node_tmp;
 127 }
 128
 129 #endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */