1 /* 2 * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: 3 * 4 * Marek Lindner, Simon Wunderlich 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of version 2 of the GNU General Public 8 * License as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 18 * 02110-1301, USA 19 * 20 */ 21 22 #ifndef _NET_BATMAN_ADV_ORIGINATOR_H_ 23 #define _NET_BATMAN_ADV_ORIGINATOR_H_ 24 25 int originator_init(struct bat_priv *bat_priv); 26 void originator_free(struct bat_priv *bat_priv); 27 void purge_orig_ref(struct bat_priv *bat_priv); 28 struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr); 29 struct neigh_node * 30 create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node, 31 uint8_t *neigh, struct batman_if *if_incoming); 32 int orig_seq_print_text(struct seq_file *seq, void *offset); 33 int orig_hash_add_if(struct batman_if *batman_if, int max_if_num); 34 int orig_hash_del_if(struct batman_if *batman_if, int max_if_num); 35 36 37 /* returns 1 if they are the same originator */ 38 static inline int compare_orig(void *data1, void *data2) 39 { 40 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); 41 } 42 43 /* hashfunction to choose an entry in a hash table of given size */ 44 /* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */ 45 static inline int choose_orig(void *data, int32_t size) 46 { 47 unsigned char *key = data; 48 uint32_t hash = 0; 49 size_t i; 50 51 for (i = 0; i < 6; i++) { 52 hash += key[i]; 53 hash += (hash << 10); 54 hash ^= (hash >> 6); 55 } 56 57 hash += (hash << 3); 58 hash ^= (hash >> 11); 59 hash += (hash << 15); 60 61 return hash % size; 62 } 63 64 #endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */ 65