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 34 struct netlink_callback; 35 struct seq_file; 36 struct sk_buff; 37 38 bool batadv_compare_orig(const struct hlist_node *node, const void *data2); 39 int batadv_originator_init(struct batadv_priv *bat_priv); 40 void batadv_originator_free(struct batadv_priv *bat_priv); 41 void batadv_purge_orig_ref(struct batadv_priv *bat_priv); 42 void batadv_orig_node_put(struct batadv_orig_node *orig_node); 43 struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, 44 const u8 *addr); 45 struct batadv_hardif_neigh_node * 46 batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface, 47 const u8 *neigh_addr); 48 void 49 batadv_hardif_neigh_put(struct batadv_hardif_neigh_node *hardif_neigh); 50 struct batadv_neigh_node * 51 batadv_neigh_node_get_or_create(struct batadv_orig_node *orig_node, 52 struct batadv_hard_iface *hard_iface, 53 const u8 *neigh_addr); 54 void batadv_neigh_node_put(struct batadv_neigh_node *neigh_node); 55 struct batadv_neigh_node * 56 batadv_orig_router_get(struct batadv_orig_node *orig_node, 57 const struct batadv_hard_iface *if_outgoing); 58 struct batadv_neigh_ifinfo * 59 batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh, 60 struct batadv_hard_iface *if_outgoing); 61 struct batadv_neigh_ifinfo * 62 batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh, 63 struct batadv_hard_iface *if_outgoing); 64 void batadv_neigh_ifinfo_put(struct batadv_neigh_ifinfo *neigh_ifinfo); 65 66 int batadv_hardif_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb); 67 int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset); 68 69 struct batadv_orig_ifinfo * 70 batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node, 71 struct batadv_hard_iface *if_outgoing); 72 struct batadv_orig_ifinfo * 73 batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node, 74 struct batadv_hard_iface *if_outgoing); 75 void batadv_orig_ifinfo_put(struct batadv_orig_ifinfo *orig_ifinfo); 76 77 int batadv_orig_seq_print_text(struct seq_file *seq, void *offset); 78 int batadv_orig_dump(struct sk_buff *msg, struct netlink_callback *cb); 79 int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset); 80 int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, 81 int max_if_num); 82 int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface, 83 int max_if_num); 84 struct batadv_orig_node_vlan * 85 batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node, 86 unsigned short vid); 87 struct batadv_orig_node_vlan * 88 batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node, 89 unsigned short vid); 90 void 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 */ 95 static 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 } 102 103 static inline struct batadv_orig_node * 104 batadv_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