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 uint8_t *addr); 44 struct batadv_neigh_node * 45 batadv_neigh_node_get(const struct batadv_orig_node *orig_node, 46 const struct batadv_hard_iface *hard_iface, 47 const uint8_t *addr); 48 struct batadv_neigh_node * 49 batadv_neigh_node_new(struct batadv_hard_iface *hard_iface, 50 const uint8_t *neigh_addr, 51 struct batadv_orig_node *orig_node); 52 void batadv_neigh_node_free_ref(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_free_ref(struct batadv_neigh_ifinfo *neigh_ifinfo); 63 64 struct batadv_orig_ifinfo * 65 batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node, 66 struct batadv_hard_iface *if_outgoing); 67 struct batadv_orig_ifinfo * 68 batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node, 69 struct batadv_hard_iface *if_outgoing); 70 void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo); 71 72 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset); 73 int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset); 74 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, 75 int max_if_num); 76 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface, 77 int max_if_num); 78 struct batadv_orig_node_vlan * 79 batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node, 80 unsigned short vid); 81 struct batadv_orig_node_vlan * 82 batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node, 83 unsigned short vid); 84 void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan); 85 86 /* hashfunction to choose an entry in a hash table of given size 87 * hash algorithm from http://en.wikipedia.org/wiki/Hash_table 88 */ 89 static inline uint32_t batadv_choose_orig(const void *data, uint32_t size) 90 { 91 uint32_t hash = 0; 92 93 hash = jhash(data, ETH_ALEN, hash); 94 return hash % size; 95 } 96 97 static inline struct batadv_orig_node * 98 batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data) 99 { 100 struct batadv_hashtable *hash = bat_priv->orig_hash; 101 struct hlist_head *head; 102 struct batadv_orig_node *orig_node, *orig_node_tmp = NULL; 103 int index; 104 105 if (!hash) 106 return NULL; 107 108 index = batadv_choose_orig(data, hash->size); 109 head = &hash->table[index]; 110 111 rcu_read_lock(); 112 hlist_for_each_entry_rcu(orig_node, head, hash_entry) { 113 if (!batadv_compare_eth(orig_node, data)) 114 continue; 115 116 if (!atomic_inc_not_zero(&orig_node->refcount)) 117 continue; 118 119 orig_node_tmp = orig_node; 120 break; 121 } 122 rcu_read_unlock(); 123 124 return orig_node_tmp; 125 } 126 127 #endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */ 128