net/batman-adv/originator.h

   1 /* Copyright (C) 2007-2015 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/atomic.h>
  24 #include <linux/compiler.h>
  25 #include <linux/if_ether.h>
  26 #include <linux/jhash.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_free_ref(struct batadv_orig_node *orig_node);
  41 void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node);
  42 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
  43                                               const u8 *addr);
  44 struct batadv_neigh_node *
  45 batadv_neigh_node_new(struct batadv_orig_node *orig_node,
  46                       struct batadv_hard_iface *hard_iface,
  47                       const u8 *neigh_addr);
  48 void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node);
  49 struct batadv_neigh_node *
  50 batadv_orig_router_get(struct batadv_orig_node *orig_node,
  51                        const struct batadv_hard_iface *if_outgoing);
  52 struct batadv_neigh_ifinfo *
  53 batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
  54                         struct batadv_hard_iface *if_outgoing);
  55 struct batadv_neigh_ifinfo *
  56 batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh,
  57                         struct batadv_hard_iface *if_outgoing);
  58 void batadv_neigh_ifinfo_free_ref(struct batadv_neigh_ifinfo *neigh_ifinfo);
  59
  60 struct batadv_orig_ifinfo *
  61 batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
  62                        struct batadv_hard_iface *if_outgoing);
  63 struct batadv_orig_ifinfo *
  64 batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
  65                        struct batadv_hard_iface *if_outgoing);
  66 void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo);
  67
  68 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset);
  69 int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset);
  70 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
  71                             int max_if_num);
  72 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
  73                             int max_if_num);
  74 struct batadv_orig_node_vlan *
  75 batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
  76                           unsigned short vid);
  77 struct batadv_orig_node_vlan *
  78 batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
  79                           unsigned short vid);
  80 void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan);
  81
  82 /* hashfunction to choose an entry in a hash table of given size
  83  * hash algorithm from http://en.wikipedia.org/wiki/Hash_table
  84  */
  85 static inline u32 batadv_choose_orig(const void *data, u32 size)
  86 {
  87         u32 hash = 0;
  88
  89         hash = jhash(data, ETH_ALEN, hash);
  90         return hash % size;
  91 }
  92
  93 static inline struct batadv_orig_node *
  94 batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data)
  95 {
  96         struct batadv_hashtable *hash = bat_priv->orig_hash;
  97         struct hlist_head *head;
  98         struct batadv_orig_node *orig_node, *orig_node_tmp = NULL;
  99         int index;
 100
 101         if (!hash)
 102                 return NULL;
 103
 104         index = batadv_choose_orig(data, hash->size);
 105         head = &hash->table[index];
 106
 107         rcu_read_lock();
 108         hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 109                 if (!batadv_compare_eth(orig_node, data))
 110                         continue;
 111
 112                 if (!atomic_inc_not_zero(&orig_node->refcount))
 113                         continue;
 114
 115                 orig_node_tmp = orig_node;
 116                 break;
 117         }
 118         rcu_read_unlock();
 119
 120         return orig_node_tmp;
 121 }
 122
 123 #endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */