LXR linux/net/batman-adv/originator.h

   1/* Copyright (C) 2007-2017  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
  34struct netlink_callback;
  35struct seq_file;
  36struct sk_buff;
  37
  38bool batadv_compare_orig(const struct hlist_node *node, const void *data2);
  39int batadv_originator_init(struct batadv_priv *bat_priv);
  40void batadv_originator_free(struct batadv_priv *bat_priv);
  41void batadv_purge_orig_ref(struct batadv_priv *bat_priv);
  42void batadv_orig_node_put(struct batadv_orig_node *orig_node);
  43struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
  44                                              const u8 *addr);
  45struct batadv_hardif_neigh_node *
  46batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface,
  47                        const u8 *neigh_addr);
  48void
  49batadv_hardif_neigh_put(struct batadv_hardif_neigh_node *hardif_neigh);
  50struct batadv_neigh_node *
  51batadv_neigh_node_get_or_create(struct batadv_orig_node *orig_node,
  52                                struct batadv_hard_iface *hard_iface,
  53                                const u8 *neigh_addr);
  54void batadv_neigh_node_put(struct batadv_neigh_node *neigh_node);
  55struct batadv_neigh_node *
  56batadv_orig_router_get(struct batadv_orig_node *orig_node,
  57                       const struct batadv_hard_iface *if_outgoing);
  58struct batadv_neigh_ifinfo *
  59batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
  60                        struct batadv_hard_iface *if_outgoing);
  61struct batadv_neigh_ifinfo *
  62batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh,
  63                        struct batadv_hard_iface *if_outgoing);
  64void batadv_neigh_ifinfo_put(struct batadv_neigh_ifinfo *neigh_ifinfo);
  65
  66int batadv_hardif_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb);
  67int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset);
  68
  69struct batadv_orig_ifinfo *
  70batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
  71                       struct batadv_hard_iface *if_outgoing);
  72struct batadv_orig_ifinfo *
  73batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node,
  74                       struct batadv_hard_iface *if_outgoing);
  75void batadv_orig_ifinfo_put(struct batadv_orig_ifinfo *orig_ifinfo);
  76
  77int batadv_orig_seq_print_text(struct seq_file *seq, void *offset);
  78int batadv_orig_dump(struct sk_buff *msg, struct netlink_callback *cb);
  79int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset);
  80int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
  81                            int max_if_num);
  82int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
  83                            int max_if_num);
  84struct batadv_orig_node_vlan *
  85batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
  86                          unsigned short vid);
  87struct batadv_orig_node_vlan *
  88batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
  89                          unsigned short vid);
  90void batadv_orig_node_vlan_put(struct batadv_orig_node_vlan *orig_vlan);
  91
  92/* hashfunction to choose an entry in a hash table of given size
  93 * hash algorithm from http://en.wikipedia.org/wiki/Hash_table
  94 */
  95static inline u32 batadv_choose_orig(const void *data, u32 size)
  96{
  97        u32 hash = 0;
  98
  99        hash = jhash(data, ETH_ALEN, hash);
 100        return hash % size;
 101}
 102
 103static inline struct batadv_orig_node *
 104batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data)
 105{
 106        struct batadv_hashtable *hash = bat_priv->orig_hash;
 107        struct hlist_head *head;
 108        struct batadv_orig_node *orig_node, *orig_node_tmp = NULL;
 109        int index;
 110
 111        if (!hash)
 112                return NULL;
 113
 114        index = batadv_choose_orig(data, hash->size);
 115        head = &hash->table[index];
 116
 117        rcu_read_lock();
 118        hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 119                if (!batadv_compare_eth(orig_node, data))
 120                        continue;
 121
 122                if (!kref_get_unless_zero(&orig_node->refcount))
 123                        continue;
 124
 125                orig_node_tmp = orig_node;
 126                break;
 127        }
 128        rcu_read_unlock();
 129
 130        return orig_node_tmp;
 131}
 132
 133#endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */
 134