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7ea7b4a142
This change allows nodes to handle the TT table on a per-VLAN basis. This is needed because nodes may have to store only some of the global entries advertised by another node. In this scenario such nodes would re-create only a partial global table and would not be able to compute a correct CRC anymore. This patch splits the logic and introduces one CRC per VLAN. In this way a node fetching only some entries belonging to some VLANs is still able to compute the needed CRCs and still check the table correctness. With this patch the shape of the TVLV-TT is changed too because now a node needs to advertise all the CRCs of all the VLANs that it is wired to. The debug output of the local Translation Table now shows the CRC along with each entry since there is not a common value for the entire table anymore. Signed-off-by: Antonio Quartulli <antonio@open-mesh.com> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#ifndef _NET_BATMAN_ADV_ORIGINATOR_H_
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#define _NET_BATMAN_ADV_ORIGINATOR_H_
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#include "hash.h"
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int batadv_originator_init(struct batadv_priv *bat_priv);
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void batadv_originator_free(struct batadv_priv *bat_priv);
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void batadv_purge_orig_ref(struct batadv_priv *bat_priv);
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void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node);
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void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node);
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struct batadv_orig_node *batadv_get_orig_node(struct batadv_priv *bat_priv,
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const uint8_t *addr);
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struct batadv_neigh_node *
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batadv_neigh_node_new(struct batadv_hard_iface *hard_iface,
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const uint8_t *neigh_addr);
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void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node);
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struct batadv_neigh_node *
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batadv_orig_node_get_router(struct batadv_orig_node *orig_node);
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int batadv_orig_seq_print_text(struct seq_file *seq, void *offset);
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int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
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int max_if_num);
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int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
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int max_if_num);
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struct batadv_orig_node_vlan *
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batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
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unsigned short vid);
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struct batadv_orig_node_vlan *
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batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
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unsigned short vid);
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void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan);
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/* hashfunction to choose an entry in a hash table of given size
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* hash algorithm from http://en.wikipedia.org/wiki/Hash_table
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*/
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static inline uint32_t batadv_choose_orig(const void *data, uint32_t size)
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{
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const unsigned char *key = data;
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uint32_t hash = 0;
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size_t i;
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for (i = 0; i < 6; i++) {
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hash += key[i];
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hash += (hash << 10);
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hash ^= (hash >> 6);
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}
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hash += (hash << 3);
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hash ^= (hash >> 11);
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hash += (hash << 15);
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return hash % size;
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}
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static inline struct batadv_orig_node *
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batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data)
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{
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struct batadv_hashtable *hash = bat_priv->orig_hash;
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struct hlist_head *head;
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struct batadv_orig_node *orig_node, *orig_node_tmp = NULL;
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int index;
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if (!hash)
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return NULL;
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index = batadv_choose_orig(data, hash->size);
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head = &hash->table[index];
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rcu_read_lock();
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hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
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if (!batadv_compare_eth(orig_node, data))
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continue;
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if (!atomic_inc_not_zero(&orig_node->refcount))
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continue;
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orig_node_tmp = orig_node;
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break;
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}
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rcu_read_unlock();
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return orig_node_tmp;
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}
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#endif /* _NET_BATMAN_ADV_ORIGINATOR_H_ */
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