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_ */ 124