1723 lines
45 KiB
C
1723 lines
45 KiB
C
/*
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* Copyright (C) 2007-2011 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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*/
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#include "main.h"
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#include "translation-table.h"
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#include "soft-interface.h"
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#include "hard-interface.h"
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#include "send.h"
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#include "hash.h"
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#include "originator.h"
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#include "routing.h"
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#include <linux/crc16.h>
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static void _tt_global_del(struct bat_priv *bat_priv,
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struct tt_global_entry *tt_global_entry,
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const char *message);
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static void tt_purge(struct work_struct *work);
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/* returns 1 if they are the same mac addr */
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static int compare_ltt(const struct hlist_node *node, const void *data2)
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{
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const void *data1 = container_of(node, struct tt_local_entry,
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hash_entry);
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return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
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}
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/* returns 1 if they are the same mac addr */
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static int compare_gtt(const struct hlist_node *node, const void *data2)
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{
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const void *data1 = container_of(node, struct tt_global_entry,
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hash_entry);
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return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
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}
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static void tt_start_timer(struct bat_priv *bat_priv)
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{
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INIT_DELAYED_WORK(&bat_priv->tt_work, tt_purge);
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queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work,
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msecs_to_jiffies(5000));
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}
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static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
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const void *data)
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{
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struct hashtable_t *hash = bat_priv->tt_local_hash;
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struct hlist_head *head;
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struct hlist_node *node;
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struct tt_local_entry *tt_local_entry, *tt_local_entry_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 = 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(tt_local_entry, node, head, hash_entry) {
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if (!compare_eth(tt_local_entry, data))
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continue;
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if (!atomic_inc_not_zero(&tt_local_entry->refcount))
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continue;
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tt_local_entry_tmp = tt_local_entry;
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break;
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}
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rcu_read_unlock();
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return tt_local_entry_tmp;
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}
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static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
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const void *data)
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{
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struct hashtable_t *hash = bat_priv->tt_global_hash;
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struct hlist_head *head;
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struct hlist_node *node;
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struct tt_global_entry *tt_global_entry;
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struct tt_global_entry *tt_global_entry_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 = 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(tt_global_entry, node, head, hash_entry) {
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if (!compare_eth(tt_global_entry, data))
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continue;
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if (!atomic_inc_not_zero(&tt_global_entry->refcount))
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continue;
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tt_global_entry_tmp = tt_global_entry;
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break;
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}
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rcu_read_unlock();
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return tt_global_entry_tmp;
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}
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static bool is_out_of_time(unsigned long starting_time, unsigned long timeout)
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{
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unsigned long deadline;
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deadline = starting_time + msecs_to_jiffies(timeout);
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return time_after(jiffies, deadline);
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}
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static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry)
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{
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if (atomic_dec_and_test(&tt_local_entry->refcount))
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kfree_rcu(tt_local_entry, rcu);
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}
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static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry)
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{
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if (atomic_dec_and_test(&tt_global_entry->refcount))
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kfree_rcu(tt_global_entry, rcu);
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}
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static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr,
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uint8_t flags)
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{
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struct tt_change_node *tt_change_node;
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tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
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if (!tt_change_node)
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return;
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tt_change_node->change.flags = flags;
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memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
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spin_lock_bh(&bat_priv->tt_changes_list_lock);
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/* track the change in the OGMinterval list */
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list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list);
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atomic_inc(&bat_priv->tt_local_changes);
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spin_unlock_bh(&bat_priv->tt_changes_list_lock);
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atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
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}
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int tt_len(int changes_num)
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{
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return changes_num * sizeof(struct tt_change);
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}
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static int tt_local_init(struct bat_priv *bat_priv)
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{
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if (bat_priv->tt_local_hash)
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return 1;
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bat_priv->tt_local_hash = hash_new(1024);
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if (!bat_priv->tt_local_hash)
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return 0;
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return 1;
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}
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void tt_local_add(struct net_device *soft_iface, const uint8_t *addr)
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{
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struct bat_priv *bat_priv = netdev_priv(soft_iface);
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struct tt_local_entry *tt_local_entry = NULL;
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struct tt_global_entry *tt_global_entry = NULL;
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tt_local_entry = tt_local_hash_find(bat_priv, addr);
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if (tt_local_entry) {
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tt_local_entry->last_seen = jiffies;
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goto out;
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}
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tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
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if (!tt_local_entry)
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goto out;
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bat_dbg(DBG_TT, bat_priv,
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"Creating new local tt entry: %pM (ttvn: %d)\n", addr,
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(uint8_t)atomic_read(&bat_priv->ttvn));
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memcpy(tt_local_entry->addr, addr, ETH_ALEN);
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tt_local_entry->last_seen = jiffies;
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tt_local_entry->flags = NO_FLAGS;
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atomic_set(&tt_local_entry->refcount, 2);
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/* the batman interface mac address should never be purged */
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if (compare_eth(addr, soft_iface->dev_addr))
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tt_local_entry->flags |= TT_CLIENT_NOPURGE;
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tt_local_event(bat_priv, addr, tt_local_entry->flags);
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/* The local entry has to be marked as NEW to avoid to send it in
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* a full table response going out before the next ttvn increment
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* (consistency check) */
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tt_local_entry->flags |= TT_CLIENT_NEW;
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hash_add(bat_priv->tt_local_hash, compare_ltt, choose_orig,
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tt_local_entry, &tt_local_entry->hash_entry);
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/* remove address from global hash if present */
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tt_global_entry = tt_global_hash_find(bat_priv, addr);
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/* Check whether it is a roaming! */
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if (tt_global_entry) {
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/* This node is probably going to update its tt table */
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tt_global_entry->orig_node->tt_poss_change = true;
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/* The global entry has to be marked as PENDING and has to be
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* kept for consistency purpose */
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tt_global_entry->flags |= TT_CLIENT_PENDING;
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send_roam_adv(bat_priv, tt_global_entry->addr,
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tt_global_entry->orig_node);
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}
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out:
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if (tt_local_entry)
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tt_local_entry_free_ref(tt_local_entry);
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if (tt_global_entry)
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tt_global_entry_free_ref(tt_global_entry);
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}
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int tt_changes_fill_buffer(struct bat_priv *bat_priv,
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unsigned char *buff, int buff_len)
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{
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int count = 0, tot_changes = 0;
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struct tt_change_node *entry, *safe;
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if (buff_len > 0)
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tot_changes = buff_len / tt_len(1);
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spin_lock_bh(&bat_priv->tt_changes_list_lock);
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atomic_set(&bat_priv->tt_local_changes, 0);
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list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
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list) {
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if (count < tot_changes) {
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memcpy(buff + tt_len(count),
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&entry->change, sizeof(struct tt_change));
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count++;
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}
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list_del(&entry->list);
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kfree(entry);
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}
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spin_unlock_bh(&bat_priv->tt_changes_list_lock);
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/* Keep the buffer for possible tt_request */
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spin_lock_bh(&bat_priv->tt_buff_lock);
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kfree(bat_priv->tt_buff);
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bat_priv->tt_buff_len = 0;
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bat_priv->tt_buff = NULL;
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/* We check whether this new OGM has no changes due to size
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* problems */
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if (buff_len > 0) {
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/**
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* if kmalloc() fails we will reply with the full table
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* instead of providing the diff
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*/
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bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC);
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if (bat_priv->tt_buff) {
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memcpy(bat_priv->tt_buff, buff, buff_len);
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bat_priv->tt_buff_len = buff_len;
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}
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}
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spin_unlock_bh(&bat_priv->tt_buff_lock);
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return tot_changes;
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}
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int tt_local_seq_print_text(struct seq_file *seq, void *offset)
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{
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struct net_device *net_dev = (struct net_device *)seq->private;
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struct bat_priv *bat_priv = netdev_priv(net_dev);
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struct hashtable_t *hash = bat_priv->tt_local_hash;
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struct tt_local_entry *tt_local_entry;
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struct hard_iface *primary_if;
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struct hlist_node *node;
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struct hlist_head *head;
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size_t buf_size, pos;
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char *buff;
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int i, ret = 0;
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primary_if = primary_if_get_selected(bat_priv);
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if (!primary_if) {
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ret = seq_printf(seq, "BATMAN mesh %s disabled - "
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"please specify interfaces to enable it\n",
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net_dev->name);
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goto out;
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}
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if (primary_if->if_status != IF_ACTIVE) {
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ret = seq_printf(seq, "BATMAN mesh %s disabled - "
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"primary interface not active\n",
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net_dev->name);
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goto out;
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}
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seq_printf(seq, "Locally retrieved addresses (from %s) "
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"announced via TT (TTVN: %u):\n",
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net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
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buf_size = 1;
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/* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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rcu_read_lock();
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__hlist_for_each_rcu(node, head)
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buf_size += 21;
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rcu_read_unlock();
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}
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buff = kmalloc(buf_size, GFP_ATOMIC);
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if (!buff) {
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ret = -ENOMEM;
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goto out;
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}
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buff[0] = '\0';
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pos = 0;
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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rcu_read_lock();
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hlist_for_each_entry_rcu(tt_local_entry, node,
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head, hash_entry) {
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pos += snprintf(buff + pos, 22, " * %pM\n",
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tt_local_entry->addr);
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}
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rcu_read_unlock();
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}
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seq_printf(seq, "%s", buff);
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kfree(buff);
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out:
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if (primary_if)
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hardif_free_ref(primary_if);
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return ret;
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}
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static void tt_local_set_pending(struct bat_priv *bat_priv,
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struct tt_local_entry *tt_local_entry,
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uint16_t flags)
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{
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tt_local_event(bat_priv, tt_local_entry->addr,
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tt_local_entry->flags | flags);
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/* The local client has to be merked as "pending to be removed" but has
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* to be kept in the table in order to send it in an full tables
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* response issued before the net ttvn increment (consistency check) */
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tt_local_entry->flags |= TT_CLIENT_PENDING;
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}
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void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
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const char *message, bool roaming)
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{
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struct tt_local_entry *tt_local_entry = NULL;
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tt_local_entry = tt_local_hash_find(bat_priv, addr);
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if (!tt_local_entry)
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goto out;
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tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL |
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(roaming ? TT_CLIENT_ROAM : NO_FLAGS));
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bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) pending to be removed: "
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"%s\n", tt_local_entry->addr, message);
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out:
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if (tt_local_entry)
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tt_local_entry_free_ref(tt_local_entry);
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}
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static void tt_local_purge(struct bat_priv *bat_priv)
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{
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struct hashtable_t *hash = bat_priv->tt_local_hash;
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struct tt_local_entry *tt_local_entry;
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struct hlist_node *node, *node_tmp;
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struct hlist_head *head;
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spinlock_t *list_lock; /* protects write access to the hash lists */
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int i;
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for (i = 0; i < hash->size; i++) {
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head = &hash->table[i];
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list_lock = &hash->list_locks[i];
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spin_lock_bh(list_lock);
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hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
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head, hash_entry) {
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if (tt_local_entry->flags & TT_CLIENT_NOPURGE)
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continue;
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/* entry already marked for deletion */
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if (tt_local_entry->flags & TT_CLIENT_PENDING)
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continue;
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if (!is_out_of_time(tt_local_entry->last_seen,
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TT_LOCAL_TIMEOUT * 1000))
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continue;
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tt_local_set_pending(bat_priv, tt_local_entry,
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TT_CLIENT_DEL);
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bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) "
|
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"pending to be removed: timed out\n",
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tt_local_entry->addr);
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}
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spin_unlock_bh(list_lock);
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}
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}
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|
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static void tt_local_table_free(struct bat_priv *bat_priv)
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{
|
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struct hashtable_t *hash;
|
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spinlock_t *list_lock; /* protects write access to the hash lists */
|
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struct tt_local_entry *tt_local_entry;
|
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struct hlist_node *node, *node_tmp;
|
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struct hlist_head *head;
|
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int i;
|
|
|
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if (!bat_priv->tt_local_hash)
|
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return;
|
|
|
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hash = bat_priv->tt_local_hash;
|
|
|
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for (i = 0; i < hash->size; i++) {
|
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head = &hash->table[i];
|
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list_lock = &hash->list_locks[i];
|
|
|
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spin_lock_bh(list_lock);
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hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
|
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head, hash_entry) {
|
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hlist_del_rcu(node);
|
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tt_local_entry_free_ref(tt_local_entry);
|
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}
|
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spin_unlock_bh(list_lock);
|
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}
|
|
|
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hash_destroy(hash);
|
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|
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bat_priv->tt_local_hash = NULL;
|
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}
|
|
|
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static int tt_global_init(struct bat_priv *bat_priv)
|
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{
|
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if (bat_priv->tt_global_hash)
|
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return 1;
|
|
|
|
bat_priv->tt_global_hash = hash_new(1024);
|
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|
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if (!bat_priv->tt_global_hash)
|
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return 0;
|
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|
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return 1;
|
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}
|
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|
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static void tt_changes_list_free(struct bat_priv *bat_priv)
|
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{
|
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struct tt_change_node *entry, *safe;
|
|
|
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spin_lock_bh(&bat_priv->tt_changes_list_lock);
|
|
|
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list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
|
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list) {
|
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list_del(&entry->list);
|
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kfree(entry);
|
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}
|
|
|
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atomic_set(&bat_priv->tt_local_changes, 0);
|
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spin_unlock_bh(&bat_priv->tt_changes_list_lock);
|
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}
|
|
|
|
/* caller must hold orig_node refcount */
|
|
int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
|
|
const unsigned char *tt_addr, uint8_t ttvn, bool roaming)
|
|
{
|
|
struct tt_global_entry *tt_global_entry;
|
|
struct orig_node *orig_node_tmp;
|
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int ret = 0;
|
|
|
|
tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
|
|
|
|
if (!tt_global_entry) {
|
|
tt_global_entry =
|
|
kmalloc(sizeof(*tt_global_entry),
|
|
GFP_ATOMIC);
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
memcpy(tt_global_entry->addr, tt_addr, ETH_ALEN);
|
|
/* Assign the new orig_node */
|
|
atomic_inc(&orig_node->refcount);
|
|
tt_global_entry->orig_node = orig_node;
|
|
tt_global_entry->ttvn = ttvn;
|
|
tt_global_entry->flags = NO_FLAGS;
|
|
tt_global_entry->roam_at = 0;
|
|
atomic_set(&tt_global_entry->refcount, 2);
|
|
|
|
hash_add(bat_priv->tt_global_hash, compare_gtt,
|
|
choose_orig, tt_global_entry,
|
|
&tt_global_entry->hash_entry);
|
|
atomic_inc(&orig_node->tt_size);
|
|
} else {
|
|
if (tt_global_entry->orig_node != orig_node) {
|
|
atomic_dec(&tt_global_entry->orig_node->tt_size);
|
|
orig_node_tmp = tt_global_entry->orig_node;
|
|
atomic_inc(&orig_node->refcount);
|
|
tt_global_entry->orig_node = orig_node;
|
|
orig_node_free_ref(orig_node_tmp);
|
|
atomic_inc(&orig_node->tt_size);
|
|
}
|
|
tt_global_entry->ttvn = ttvn;
|
|
tt_global_entry->flags = NO_FLAGS;
|
|
tt_global_entry->roam_at = 0;
|
|
}
|
|
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Creating new global tt entry: %pM (via %pM)\n",
|
|
tt_global_entry->addr, orig_node->orig);
|
|
|
|
/* remove address from local hash if present */
|
|
tt_local_remove(bat_priv, tt_global_entry->addr,
|
|
"global tt received", roaming);
|
|
ret = 1;
|
|
out:
|
|
if (tt_global_entry)
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
return ret;
|
|
}
|
|
|
|
int tt_global_seq_print_text(struct seq_file *seq, void *offset)
|
|
{
|
|
struct net_device *net_dev = (struct net_device *)seq->private;
|
|
struct bat_priv *bat_priv = netdev_priv(net_dev);
|
|
struct hashtable_t *hash = bat_priv->tt_global_hash;
|
|
struct tt_global_entry *tt_global_entry;
|
|
struct hard_iface *primary_if;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
size_t buf_size, pos;
|
|
char *buff;
|
|
int i, ret = 0;
|
|
|
|
primary_if = primary_if_get_selected(bat_priv);
|
|
if (!primary_if) {
|
|
ret = seq_printf(seq, "BATMAN mesh %s disabled - please "
|
|
"specify interfaces to enable it\n",
|
|
net_dev->name);
|
|
goto out;
|
|
}
|
|
|
|
if (primary_if->if_status != IF_ACTIVE) {
|
|
ret = seq_printf(seq, "BATMAN mesh %s disabled - "
|
|
"primary interface not active\n",
|
|
net_dev->name);
|
|
goto out;
|
|
}
|
|
|
|
seq_printf(seq,
|
|
"Globally announced TT entries received via the mesh %s\n",
|
|
net_dev->name);
|
|
seq_printf(seq, " %-13s %s %-15s %s\n",
|
|
"Client", "(TTVN)", "Originator", "(Curr TTVN)");
|
|
|
|
buf_size = 1;
|
|
/* Estimate length for: " * xx:xx:xx:xx:xx:xx (ttvn) via
|
|
* xx:xx:xx:xx:xx:xx (cur_ttvn)\n"*/
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
__hlist_for_each_rcu(node, head)
|
|
buf_size += 59;
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
buff = kmalloc(buf_size, GFP_ATOMIC);
|
|
if (!buff) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
buff[0] = '\0';
|
|
pos = 0;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_global_entry, node,
|
|
head, hash_entry) {
|
|
pos += snprintf(buff + pos, 61,
|
|
" * %pM (%3u) via %pM (%3u)\n",
|
|
tt_global_entry->addr,
|
|
tt_global_entry->ttvn,
|
|
tt_global_entry->orig_node->orig,
|
|
(uint8_t) atomic_read(
|
|
&tt_global_entry->orig_node->
|
|
last_ttvn));
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
seq_printf(seq, "%s", buff);
|
|
kfree(buff);
|
|
out:
|
|
if (primary_if)
|
|
hardif_free_ref(primary_if);
|
|
return ret;
|
|
}
|
|
|
|
static void _tt_global_del(struct bat_priv *bat_priv,
|
|
struct tt_global_entry *tt_global_entry,
|
|
const char *message)
|
|
{
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Deleting global tt entry %pM (via %pM): %s\n",
|
|
tt_global_entry->addr, tt_global_entry->orig_node->orig,
|
|
message);
|
|
|
|
atomic_dec(&tt_global_entry->orig_node->tt_size);
|
|
|
|
hash_remove(bat_priv->tt_global_hash, compare_gtt, choose_orig,
|
|
tt_global_entry->addr);
|
|
out:
|
|
if (tt_global_entry)
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
}
|
|
|
|
void tt_global_del(struct bat_priv *bat_priv,
|
|
struct orig_node *orig_node, const unsigned char *addr,
|
|
const char *message, bool roaming)
|
|
{
|
|
struct tt_global_entry *tt_global_entry = NULL;
|
|
|
|
tt_global_entry = tt_global_hash_find(bat_priv, addr);
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
if (tt_global_entry->orig_node == orig_node) {
|
|
if (roaming) {
|
|
tt_global_entry->flags |= TT_CLIENT_ROAM;
|
|
tt_global_entry->roam_at = jiffies;
|
|
goto out;
|
|
}
|
|
_tt_global_del(bat_priv, tt_global_entry, message);
|
|
}
|
|
out:
|
|
if (tt_global_entry)
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
}
|
|
|
|
void tt_global_del_orig(struct bat_priv *bat_priv,
|
|
struct orig_node *orig_node, const char *message)
|
|
{
|
|
struct tt_global_entry *tt_global_entry;
|
|
int i;
|
|
struct hashtable_t *hash = bat_priv->tt_global_hash;
|
|
struct hlist_node *node, *safe;
|
|
struct hlist_head *head;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
list_lock = &hash->list_locks[i];
|
|
|
|
spin_lock_bh(list_lock);
|
|
hlist_for_each_entry_safe(tt_global_entry, node, safe,
|
|
head, hash_entry) {
|
|
if (tt_global_entry->orig_node == orig_node) {
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Deleting global tt entry %pM "
|
|
"(via %pM): originator time out\n",
|
|
tt_global_entry->addr,
|
|
tt_global_entry->orig_node->orig);
|
|
hlist_del_rcu(node);
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
}
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
atomic_set(&orig_node->tt_size, 0);
|
|
}
|
|
|
|
static void tt_global_roam_purge(struct bat_priv *bat_priv)
|
|
{
|
|
struct hashtable_t *hash = bat_priv->tt_global_hash;
|
|
struct tt_global_entry *tt_global_entry;
|
|
struct hlist_node *node, *node_tmp;
|
|
struct hlist_head *head;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
int i;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
list_lock = &hash->list_locks[i];
|
|
|
|
spin_lock_bh(list_lock);
|
|
hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
|
|
head, hash_entry) {
|
|
if (!(tt_global_entry->flags & TT_CLIENT_ROAM))
|
|
continue;
|
|
if (!is_out_of_time(tt_global_entry->roam_at,
|
|
TT_CLIENT_ROAM_TIMEOUT * 1000))
|
|
continue;
|
|
|
|
bat_dbg(DBG_TT, bat_priv, "Deleting global "
|
|
"tt entry (%pM): Roaming timeout\n",
|
|
tt_global_entry->addr);
|
|
atomic_dec(&tt_global_entry->orig_node->tt_size);
|
|
hlist_del_rcu(node);
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
|
|
}
|
|
|
|
static void tt_global_table_free(struct bat_priv *bat_priv)
|
|
{
|
|
struct hashtable_t *hash;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
struct tt_global_entry *tt_global_entry;
|
|
struct hlist_node *node, *node_tmp;
|
|
struct hlist_head *head;
|
|
int i;
|
|
|
|
if (!bat_priv->tt_global_hash)
|
|
return;
|
|
|
|
hash = bat_priv->tt_global_hash;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
list_lock = &hash->list_locks[i];
|
|
|
|
spin_lock_bh(list_lock);
|
|
hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
|
|
head, hash_entry) {
|
|
hlist_del_rcu(node);
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
|
|
hash_destroy(hash);
|
|
|
|
bat_priv->tt_global_hash = NULL;
|
|
}
|
|
|
|
struct orig_node *transtable_search(struct bat_priv *bat_priv,
|
|
const uint8_t *addr)
|
|
{
|
|
struct tt_global_entry *tt_global_entry;
|
|
struct orig_node *orig_node = NULL;
|
|
|
|
tt_global_entry = tt_global_hash_find(bat_priv, addr);
|
|
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
|
|
goto free_tt;
|
|
|
|
/* A global client marked as PENDING has already moved from that
|
|
* originator */
|
|
if (tt_global_entry->flags & TT_CLIENT_PENDING)
|
|
goto free_tt;
|
|
|
|
orig_node = tt_global_entry->orig_node;
|
|
|
|
free_tt:
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
out:
|
|
return orig_node;
|
|
}
|
|
|
|
/* Calculates the checksum of the local table of a given orig_node */
|
|
uint16_t tt_global_crc(struct bat_priv *bat_priv, struct orig_node *orig_node)
|
|
{
|
|
uint16_t total = 0, total_one;
|
|
struct hashtable_t *hash = bat_priv->tt_global_hash;
|
|
struct tt_global_entry *tt_global_entry;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
int i, j;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_global_entry, node,
|
|
head, hash_entry) {
|
|
if (compare_eth(tt_global_entry->orig_node,
|
|
orig_node)) {
|
|
/* Roaming clients are in the global table for
|
|
* consistency only. They don't have to be
|
|
* taken into account while computing the
|
|
* global crc */
|
|
if (tt_global_entry->flags & TT_CLIENT_ROAM)
|
|
continue;
|
|
total_one = 0;
|
|
for (j = 0; j < ETH_ALEN; j++)
|
|
total_one = crc16_byte(total_one,
|
|
tt_global_entry->addr[j]);
|
|
total ^= total_one;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return total;
|
|
}
|
|
|
|
/* Calculates the checksum of the local table */
|
|
uint16_t tt_local_crc(struct bat_priv *bat_priv)
|
|
{
|
|
uint16_t total = 0, total_one;
|
|
struct hashtable_t *hash = bat_priv->tt_local_hash;
|
|
struct tt_local_entry *tt_local_entry;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
int i, j;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_local_entry, node,
|
|
head, hash_entry) {
|
|
/* not yet committed clients have not to be taken into
|
|
* account while computing the CRC */
|
|
if (tt_local_entry->flags & TT_CLIENT_NEW)
|
|
continue;
|
|
total_one = 0;
|
|
for (j = 0; j < ETH_ALEN; j++)
|
|
total_one = crc16_byte(total_one,
|
|
tt_local_entry->addr[j]);
|
|
total ^= total_one;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return total;
|
|
}
|
|
|
|
static void tt_req_list_free(struct bat_priv *bat_priv)
|
|
{
|
|
struct tt_req_node *node, *safe;
|
|
|
|
spin_lock_bh(&bat_priv->tt_req_list_lock);
|
|
|
|
list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
|
|
list_del(&node->list);
|
|
kfree(node);
|
|
}
|
|
|
|
spin_unlock_bh(&bat_priv->tt_req_list_lock);
|
|
}
|
|
|
|
void tt_save_orig_buffer(struct bat_priv *bat_priv, struct orig_node *orig_node,
|
|
const unsigned char *tt_buff, uint8_t tt_num_changes)
|
|
{
|
|
uint16_t tt_buff_len = tt_len(tt_num_changes);
|
|
|
|
/* Replace the old buffer only if I received something in the
|
|
* last OGM (the OGM could carry no changes) */
|
|
spin_lock_bh(&orig_node->tt_buff_lock);
|
|
if (tt_buff_len > 0) {
|
|
kfree(orig_node->tt_buff);
|
|
orig_node->tt_buff_len = 0;
|
|
orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
|
|
if (orig_node->tt_buff) {
|
|
memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
|
|
orig_node->tt_buff_len = tt_buff_len;
|
|
}
|
|
}
|
|
spin_unlock_bh(&orig_node->tt_buff_lock);
|
|
}
|
|
|
|
static void tt_req_purge(struct bat_priv *bat_priv)
|
|
{
|
|
struct tt_req_node *node, *safe;
|
|
|
|
spin_lock_bh(&bat_priv->tt_req_list_lock);
|
|
list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
|
|
if (is_out_of_time(node->issued_at,
|
|
TT_REQUEST_TIMEOUT * 1000)) {
|
|
list_del(&node->list);
|
|
kfree(node);
|
|
}
|
|
}
|
|
spin_unlock_bh(&bat_priv->tt_req_list_lock);
|
|
}
|
|
|
|
/* returns the pointer to the new tt_req_node struct if no request
|
|
* has already been issued for this orig_node, NULL otherwise */
|
|
static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
|
|
struct orig_node *orig_node)
|
|
{
|
|
struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
|
|
|
|
spin_lock_bh(&bat_priv->tt_req_list_lock);
|
|
list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
|
|
if (compare_eth(tt_req_node_tmp, orig_node) &&
|
|
!is_out_of_time(tt_req_node_tmp->issued_at,
|
|
TT_REQUEST_TIMEOUT * 1000))
|
|
goto unlock;
|
|
}
|
|
|
|
tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
|
|
if (!tt_req_node)
|
|
goto unlock;
|
|
|
|
memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
|
|
tt_req_node->issued_at = jiffies;
|
|
|
|
list_add(&tt_req_node->list, &bat_priv->tt_req_list);
|
|
unlock:
|
|
spin_unlock_bh(&bat_priv->tt_req_list_lock);
|
|
return tt_req_node;
|
|
}
|
|
|
|
/* data_ptr is useless here, but has to be kept to respect the prototype */
|
|
static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr)
|
|
{
|
|
const struct tt_local_entry *tt_local_entry = entry_ptr;
|
|
|
|
if (tt_local_entry->flags & TT_CLIENT_NEW)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
|
|
{
|
|
const struct tt_global_entry *tt_global_entry = entry_ptr;
|
|
const struct orig_node *orig_node = data_ptr;
|
|
|
|
if (tt_global_entry->flags & TT_CLIENT_ROAM)
|
|
return 0;
|
|
|
|
return (tt_global_entry->orig_node == orig_node);
|
|
}
|
|
|
|
static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
|
|
struct hashtable_t *hash,
|
|
struct hard_iface *primary_if,
|
|
int (*valid_cb)(const void *,
|
|
const void *),
|
|
void *cb_data)
|
|
{
|
|
struct tt_local_entry *tt_local_entry;
|
|
struct tt_query_packet *tt_response;
|
|
struct tt_change *tt_change;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
struct sk_buff *skb = NULL;
|
|
uint16_t tt_tot, tt_count;
|
|
ssize_t tt_query_size = sizeof(struct tt_query_packet);
|
|
int i;
|
|
|
|
if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
|
|
tt_len = primary_if->soft_iface->mtu - tt_query_size;
|
|
tt_len -= tt_len % sizeof(struct tt_change);
|
|
}
|
|
tt_tot = tt_len / sizeof(struct tt_change);
|
|
|
|
skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
skb_reserve(skb, ETH_HLEN);
|
|
tt_response = (struct tt_query_packet *)skb_put(skb,
|
|
tt_query_size + tt_len);
|
|
tt_response->ttvn = ttvn;
|
|
tt_response->tt_data = htons(tt_tot);
|
|
|
|
tt_change = (struct tt_change *)(skb->data + tt_query_size);
|
|
tt_count = 0;
|
|
|
|
rcu_read_lock();
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
hlist_for_each_entry_rcu(tt_local_entry, node,
|
|
head, hash_entry) {
|
|
if (tt_count == tt_tot)
|
|
break;
|
|
|
|
if ((valid_cb) && (!valid_cb(tt_local_entry, cb_data)))
|
|
continue;
|
|
|
|
memcpy(tt_change->addr, tt_local_entry->addr, ETH_ALEN);
|
|
tt_change->flags = NO_FLAGS;
|
|
|
|
tt_count++;
|
|
tt_change++;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
out:
|
|
return skb;
|
|
}
|
|
|
|
int send_tt_request(struct bat_priv *bat_priv, struct orig_node *dst_orig_node,
|
|
uint8_t ttvn, uint16_t tt_crc, bool full_table)
|
|
{
|
|
struct sk_buff *skb = NULL;
|
|
struct tt_query_packet *tt_request;
|
|
struct neigh_node *neigh_node = NULL;
|
|
struct hard_iface *primary_if;
|
|
struct tt_req_node *tt_req_node = NULL;
|
|
int ret = 1;
|
|
|
|
primary_if = primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
/* The new tt_req will be issued only if I'm not waiting for a
|
|
* reply from the same orig_node yet */
|
|
tt_req_node = new_tt_req_node(bat_priv, dst_orig_node);
|
|
if (!tt_req_node)
|
|
goto out;
|
|
|
|
skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
skb_reserve(skb, ETH_HLEN);
|
|
|
|
tt_request = (struct tt_query_packet *)skb_put(skb,
|
|
sizeof(struct tt_query_packet));
|
|
|
|
tt_request->packet_type = BAT_TT_QUERY;
|
|
tt_request->version = COMPAT_VERSION;
|
|
memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
|
|
memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
|
|
tt_request->ttl = TTL;
|
|
tt_request->ttvn = ttvn;
|
|
tt_request->tt_data = tt_crc;
|
|
tt_request->flags = TT_REQUEST;
|
|
|
|
if (full_table)
|
|
tt_request->flags |= TT_FULL_TABLE;
|
|
|
|
neigh_node = orig_node_get_router(dst_orig_node);
|
|
if (!neigh_node)
|
|
goto out;
|
|
|
|
bat_dbg(DBG_TT, bat_priv, "Sending TT_REQUEST to %pM via %pM "
|
|
"[%c]\n", dst_orig_node->orig, neigh_node->addr,
|
|
(full_table ? 'F' : '.'));
|
|
|
|
send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
|
|
ret = 0;
|
|
|
|
out:
|
|
if (neigh_node)
|
|
neigh_node_free_ref(neigh_node);
|
|
if (primary_if)
|
|
hardif_free_ref(primary_if);
|
|
if (ret)
|
|
kfree_skb(skb);
|
|
if (ret && tt_req_node) {
|
|
spin_lock_bh(&bat_priv->tt_req_list_lock);
|
|
list_del(&tt_req_node->list);
|
|
spin_unlock_bh(&bat_priv->tt_req_list_lock);
|
|
kfree(tt_req_node);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static bool send_other_tt_response(struct bat_priv *bat_priv,
|
|
struct tt_query_packet *tt_request)
|
|
{
|
|
struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL;
|
|
struct neigh_node *neigh_node = NULL;
|
|
struct hard_iface *primary_if = NULL;
|
|
uint8_t orig_ttvn, req_ttvn, ttvn;
|
|
int ret = false;
|
|
unsigned char *tt_buff;
|
|
bool full_table;
|
|
uint16_t tt_len, tt_tot;
|
|
struct sk_buff *skb = NULL;
|
|
struct tt_query_packet *tt_response;
|
|
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Received TT_REQUEST from %pM for "
|
|
"ttvn: %u (%pM) [%c]\n", tt_request->src,
|
|
tt_request->ttvn, tt_request->dst,
|
|
(tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
|
|
|
|
/* Let's get the orig node of the REAL destination */
|
|
req_dst_orig_node = get_orig_node(bat_priv, tt_request->dst);
|
|
if (!req_dst_orig_node)
|
|
goto out;
|
|
|
|
res_dst_orig_node = get_orig_node(bat_priv, tt_request->src);
|
|
if (!res_dst_orig_node)
|
|
goto out;
|
|
|
|
neigh_node = orig_node_get_router(res_dst_orig_node);
|
|
if (!neigh_node)
|
|
goto out;
|
|
|
|
primary_if = primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
|
|
req_ttvn = tt_request->ttvn;
|
|
|
|
/* I have not the requested data */
|
|
if (orig_ttvn != req_ttvn ||
|
|
tt_request->tt_data != req_dst_orig_node->tt_crc)
|
|
goto out;
|
|
|
|
/* If it has explicitly been requested the full table */
|
|
if (tt_request->flags & TT_FULL_TABLE ||
|
|
!req_dst_orig_node->tt_buff)
|
|
full_table = true;
|
|
else
|
|
full_table = false;
|
|
|
|
/* In this version, fragmentation is not implemented, then
|
|
* I'll send only one packet with as much TT entries as I can */
|
|
if (!full_table) {
|
|
spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
|
|
tt_len = req_dst_orig_node->tt_buff_len;
|
|
tt_tot = tt_len / sizeof(struct tt_change);
|
|
|
|
skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
|
|
tt_len + ETH_HLEN);
|
|
if (!skb)
|
|
goto unlock;
|
|
|
|
skb_reserve(skb, ETH_HLEN);
|
|
tt_response = (struct tt_query_packet *)skb_put(skb,
|
|
sizeof(struct tt_query_packet) + tt_len);
|
|
tt_response->ttvn = req_ttvn;
|
|
tt_response->tt_data = htons(tt_tot);
|
|
|
|
tt_buff = skb->data + sizeof(struct tt_query_packet);
|
|
/* Copy the last orig_node's OGM buffer */
|
|
memcpy(tt_buff, req_dst_orig_node->tt_buff,
|
|
req_dst_orig_node->tt_buff_len);
|
|
|
|
spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
|
|
} else {
|
|
tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) *
|
|
sizeof(struct tt_change);
|
|
ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
|
|
|
|
skb = tt_response_fill_table(tt_len, ttvn,
|
|
bat_priv->tt_global_hash,
|
|
primary_if, tt_global_valid_entry,
|
|
req_dst_orig_node);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
tt_response = (struct tt_query_packet *)skb->data;
|
|
}
|
|
|
|
tt_response->packet_type = BAT_TT_QUERY;
|
|
tt_response->version = COMPAT_VERSION;
|
|
tt_response->ttl = TTL;
|
|
memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
|
|
memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
|
|
tt_response->flags = TT_RESPONSE;
|
|
|
|
if (full_table)
|
|
tt_response->flags |= TT_FULL_TABLE;
|
|
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
|
|
res_dst_orig_node->orig, neigh_node->addr,
|
|
req_dst_orig_node->orig, req_ttvn);
|
|
|
|
send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
|
|
ret = true;
|
|
goto out;
|
|
|
|
unlock:
|
|
spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
|
|
|
|
out:
|
|
if (res_dst_orig_node)
|
|
orig_node_free_ref(res_dst_orig_node);
|
|
if (req_dst_orig_node)
|
|
orig_node_free_ref(req_dst_orig_node);
|
|
if (neigh_node)
|
|
neigh_node_free_ref(neigh_node);
|
|
if (primary_if)
|
|
hardif_free_ref(primary_if);
|
|
if (!ret)
|
|
kfree_skb(skb);
|
|
return ret;
|
|
|
|
}
|
|
static bool send_my_tt_response(struct bat_priv *bat_priv,
|
|
struct tt_query_packet *tt_request)
|
|
{
|
|
struct orig_node *orig_node = NULL;
|
|
struct neigh_node *neigh_node = NULL;
|
|
struct hard_iface *primary_if = NULL;
|
|
uint8_t my_ttvn, req_ttvn, ttvn;
|
|
int ret = false;
|
|
unsigned char *tt_buff;
|
|
bool full_table;
|
|
uint16_t tt_len, tt_tot;
|
|
struct sk_buff *skb = NULL;
|
|
struct tt_query_packet *tt_response;
|
|
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Received TT_REQUEST from %pM for "
|
|
"ttvn: %u (me) [%c]\n", tt_request->src,
|
|
tt_request->ttvn,
|
|
(tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
|
|
|
|
|
|
my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
|
|
req_ttvn = tt_request->ttvn;
|
|
|
|
orig_node = get_orig_node(bat_priv, tt_request->src);
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
neigh_node = orig_node_get_router(orig_node);
|
|
if (!neigh_node)
|
|
goto out;
|
|
|
|
primary_if = primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
/* If the full table has been explicitly requested or the gap
|
|
* is too big send the whole local translation table */
|
|
if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn ||
|
|
!bat_priv->tt_buff)
|
|
full_table = true;
|
|
else
|
|
full_table = false;
|
|
|
|
/* In this version, fragmentation is not implemented, then
|
|
* I'll send only one packet with as much TT entries as I can */
|
|
if (!full_table) {
|
|
spin_lock_bh(&bat_priv->tt_buff_lock);
|
|
tt_len = bat_priv->tt_buff_len;
|
|
tt_tot = tt_len / sizeof(struct tt_change);
|
|
|
|
skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
|
|
tt_len + ETH_HLEN);
|
|
if (!skb)
|
|
goto unlock;
|
|
|
|
skb_reserve(skb, ETH_HLEN);
|
|
tt_response = (struct tt_query_packet *)skb_put(skb,
|
|
sizeof(struct tt_query_packet) + tt_len);
|
|
tt_response->ttvn = req_ttvn;
|
|
tt_response->tt_data = htons(tt_tot);
|
|
|
|
tt_buff = skb->data + sizeof(struct tt_query_packet);
|
|
memcpy(tt_buff, bat_priv->tt_buff,
|
|
bat_priv->tt_buff_len);
|
|
spin_unlock_bh(&bat_priv->tt_buff_lock);
|
|
} else {
|
|
tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) *
|
|
sizeof(struct tt_change);
|
|
ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
|
|
|
|
skb = tt_response_fill_table(tt_len, ttvn,
|
|
bat_priv->tt_local_hash,
|
|
primary_if, tt_local_valid_entry,
|
|
NULL);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
tt_response = (struct tt_query_packet *)skb->data;
|
|
}
|
|
|
|
tt_response->packet_type = BAT_TT_QUERY;
|
|
tt_response->version = COMPAT_VERSION;
|
|
tt_response->ttl = TTL;
|
|
memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
|
|
memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
|
|
tt_response->flags = TT_RESPONSE;
|
|
|
|
if (full_table)
|
|
tt_response->flags |= TT_FULL_TABLE;
|
|
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Sending TT_RESPONSE to %pM via %pM [%c]\n",
|
|
orig_node->orig, neigh_node->addr,
|
|
(tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
|
|
|
|
send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
|
|
ret = true;
|
|
goto out;
|
|
|
|
unlock:
|
|
spin_unlock_bh(&bat_priv->tt_buff_lock);
|
|
out:
|
|
if (orig_node)
|
|
orig_node_free_ref(orig_node);
|
|
if (neigh_node)
|
|
neigh_node_free_ref(neigh_node);
|
|
if (primary_if)
|
|
hardif_free_ref(primary_if);
|
|
if (!ret)
|
|
kfree_skb(skb);
|
|
/* This packet was for me, so it doesn't need to be re-routed */
|
|
return true;
|
|
}
|
|
|
|
bool send_tt_response(struct bat_priv *bat_priv,
|
|
struct tt_query_packet *tt_request)
|
|
{
|
|
if (is_my_mac(tt_request->dst))
|
|
return send_my_tt_response(bat_priv, tt_request);
|
|
else
|
|
return send_other_tt_response(bat_priv, tt_request);
|
|
}
|
|
|
|
static void _tt_update_changes(struct bat_priv *bat_priv,
|
|
struct orig_node *orig_node,
|
|
struct tt_change *tt_change,
|
|
uint16_t tt_num_changes, uint8_t ttvn)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < tt_num_changes; i++) {
|
|
if ((tt_change + i)->flags & TT_CLIENT_DEL)
|
|
tt_global_del(bat_priv, orig_node,
|
|
(tt_change + i)->addr,
|
|
"tt removed by changes",
|
|
(tt_change + i)->flags & TT_CLIENT_ROAM);
|
|
else
|
|
if (!tt_global_add(bat_priv, orig_node,
|
|
(tt_change + i)->addr, ttvn, false))
|
|
/* In case of problem while storing a
|
|
* global_entry, we stop the updating
|
|
* procedure without committing the
|
|
* ttvn change. This will avoid to send
|
|
* corrupted data on tt_request
|
|
*/
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void tt_fill_gtable(struct bat_priv *bat_priv,
|
|
struct tt_query_packet *tt_response)
|
|
{
|
|
struct orig_node *orig_node = NULL;
|
|
|
|
orig_node = orig_hash_find(bat_priv, tt_response->src);
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
/* Purge the old table first.. */
|
|
tt_global_del_orig(bat_priv, orig_node, "Received full table");
|
|
|
|
_tt_update_changes(bat_priv, orig_node,
|
|
(struct tt_change *)(tt_response + 1),
|
|
tt_response->tt_data, tt_response->ttvn);
|
|
|
|
spin_lock_bh(&orig_node->tt_buff_lock);
|
|
kfree(orig_node->tt_buff);
|
|
orig_node->tt_buff_len = 0;
|
|
orig_node->tt_buff = NULL;
|
|
spin_unlock_bh(&orig_node->tt_buff_lock);
|
|
|
|
atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
|
|
|
|
out:
|
|
if (orig_node)
|
|
orig_node_free_ref(orig_node);
|
|
}
|
|
|
|
void tt_update_changes(struct bat_priv *bat_priv, struct orig_node *orig_node,
|
|
uint16_t tt_num_changes, uint8_t ttvn,
|
|
struct tt_change *tt_change)
|
|
{
|
|
_tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes,
|
|
ttvn);
|
|
|
|
tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change,
|
|
tt_num_changes);
|
|
atomic_set(&orig_node->last_ttvn, ttvn);
|
|
}
|
|
|
|
bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
|
|
{
|
|
struct tt_local_entry *tt_local_entry = NULL;
|
|
bool ret = false;
|
|
|
|
tt_local_entry = tt_local_hash_find(bat_priv, addr);
|
|
if (!tt_local_entry)
|
|
goto out;
|
|
/* Check if the client has been logically deleted (but is kept for
|
|
* consistency purpose) */
|
|
if (tt_local_entry->flags & TT_CLIENT_PENDING)
|
|
goto out;
|
|
ret = true;
|
|
out:
|
|
if (tt_local_entry)
|
|
tt_local_entry_free_ref(tt_local_entry);
|
|
return ret;
|
|
}
|
|
|
|
void handle_tt_response(struct bat_priv *bat_priv,
|
|
struct tt_query_packet *tt_response)
|
|
{
|
|
struct tt_req_node *node, *safe;
|
|
struct orig_node *orig_node = NULL;
|
|
|
|
bat_dbg(DBG_TT, bat_priv, "Received TT_RESPONSE from %pM for "
|
|
"ttvn %d t_size: %d [%c]\n",
|
|
tt_response->src, tt_response->ttvn,
|
|
tt_response->tt_data,
|
|
(tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
|
|
|
|
orig_node = orig_hash_find(bat_priv, tt_response->src);
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
if (tt_response->flags & TT_FULL_TABLE)
|
|
tt_fill_gtable(bat_priv, tt_response);
|
|
else
|
|
tt_update_changes(bat_priv, orig_node, tt_response->tt_data,
|
|
tt_response->ttvn,
|
|
(struct tt_change *)(tt_response + 1));
|
|
|
|
/* Delete the tt_req_node from pending tt_requests list */
|
|
spin_lock_bh(&bat_priv->tt_req_list_lock);
|
|
list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
|
|
if (!compare_eth(node->addr, tt_response->src))
|
|
continue;
|
|
list_del(&node->list);
|
|
kfree(node);
|
|
}
|
|
spin_unlock_bh(&bat_priv->tt_req_list_lock);
|
|
|
|
/* Recalculate the CRC for this orig_node and store it */
|
|
orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
|
|
/* Roaming phase is over: tables are in sync again. I can
|
|
* unset the flag */
|
|
orig_node->tt_poss_change = false;
|
|
out:
|
|
if (orig_node)
|
|
orig_node_free_ref(orig_node);
|
|
}
|
|
|
|
int tt_init(struct bat_priv *bat_priv)
|
|
{
|
|
if (!tt_local_init(bat_priv))
|
|
return 0;
|
|
|
|
if (!tt_global_init(bat_priv))
|
|
return 0;
|
|
|
|
tt_start_timer(bat_priv);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void tt_roam_list_free(struct bat_priv *bat_priv)
|
|
{
|
|
struct tt_roam_node *node, *safe;
|
|
|
|
spin_lock_bh(&bat_priv->tt_roam_list_lock);
|
|
|
|
list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
|
|
list_del(&node->list);
|
|
kfree(node);
|
|
}
|
|
|
|
spin_unlock_bh(&bat_priv->tt_roam_list_lock);
|
|
}
|
|
|
|
static void tt_roam_purge(struct bat_priv *bat_priv)
|
|
{
|
|
struct tt_roam_node *node, *safe;
|
|
|
|
spin_lock_bh(&bat_priv->tt_roam_list_lock);
|
|
list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
|
|
if (!is_out_of_time(node->first_time,
|
|
ROAMING_MAX_TIME * 1000))
|
|
continue;
|
|
|
|
list_del(&node->list);
|
|
kfree(node);
|
|
}
|
|
spin_unlock_bh(&bat_priv->tt_roam_list_lock);
|
|
}
|
|
|
|
/* This function checks whether the client already reached the
|
|
* maximum number of possible roaming phases. In this case the ROAMING_ADV
|
|
* will not be sent.
|
|
*
|
|
* returns true if the ROAMING_ADV can be sent, false otherwise */
|
|
static bool tt_check_roam_count(struct bat_priv *bat_priv,
|
|
uint8_t *client)
|
|
{
|
|
struct tt_roam_node *tt_roam_node;
|
|
bool ret = false;
|
|
|
|
spin_lock_bh(&bat_priv->tt_roam_list_lock);
|
|
/* The new tt_req will be issued only if I'm not waiting for a
|
|
* reply from the same orig_node yet */
|
|
list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
|
|
if (!compare_eth(tt_roam_node->addr, client))
|
|
continue;
|
|
|
|
if (is_out_of_time(tt_roam_node->first_time,
|
|
ROAMING_MAX_TIME * 1000))
|
|
continue;
|
|
|
|
if (!atomic_dec_not_zero(&tt_roam_node->counter))
|
|
/* Sorry, you roamed too many times! */
|
|
goto unlock;
|
|
ret = true;
|
|
break;
|
|
}
|
|
|
|
if (!ret) {
|
|
tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
|
|
if (!tt_roam_node)
|
|
goto unlock;
|
|
|
|
tt_roam_node->first_time = jiffies;
|
|
atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1);
|
|
memcpy(tt_roam_node->addr, client, ETH_ALEN);
|
|
|
|
list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
|
|
ret = true;
|
|
}
|
|
|
|
unlock:
|
|
spin_unlock_bh(&bat_priv->tt_roam_list_lock);
|
|
return ret;
|
|
}
|
|
|
|
void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
|
|
struct orig_node *orig_node)
|
|
{
|
|
struct neigh_node *neigh_node = NULL;
|
|
struct sk_buff *skb = NULL;
|
|
struct roam_adv_packet *roam_adv_packet;
|
|
int ret = 1;
|
|
struct hard_iface *primary_if;
|
|
|
|
/* before going on we have to check whether the client has
|
|
* already roamed to us too many times */
|
|
if (!tt_check_roam_count(bat_priv, client))
|
|
goto out;
|
|
|
|
skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
skb_reserve(skb, ETH_HLEN);
|
|
|
|
roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
|
|
sizeof(struct roam_adv_packet));
|
|
|
|
roam_adv_packet->packet_type = BAT_ROAM_ADV;
|
|
roam_adv_packet->version = COMPAT_VERSION;
|
|
roam_adv_packet->ttl = TTL;
|
|
primary_if = primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
|
|
hardif_free_ref(primary_if);
|
|
memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
|
|
memcpy(roam_adv_packet->client, client, ETH_ALEN);
|
|
|
|
neigh_node = orig_node_get_router(orig_node);
|
|
if (!neigh_node)
|
|
goto out;
|
|
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
|
|
orig_node->orig, client, neigh_node->addr);
|
|
|
|
send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
|
|
ret = 0;
|
|
|
|
out:
|
|
if (neigh_node)
|
|
neigh_node_free_ref(neigh_node);
|
|
if (ret)
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
|
|
static void tt_purge(struct work_struct *work)
|
|
{
|
|
struct delayed_work *delayed_work =
|
|
container_of(work, struct delayed_work, work);
|
|
struct bat_priv *bat_priv =
|
|
container_of(delayed_work, struct bat_priv, tt_work);
|
|
|
|
tt_local_purge(bat_priv);
|
|
tt_global_roam_purge(bat_priv);
|
|
tt_req_purge(bat_priv);
|
|
tt_roam_purge(bat_priv);
|
|
|
|
tt_start_timer(bat_priv);
|
|
}
|
|
|
|
void tt_free(struct bat_priv *bat_priv)
|
|
{
|
|
cancel_delayed_work_sync(&bat_priv->tt_work);
|
|
|
|
tt_local_table_free(bat_priv);
|
|
tt_global_table_free(bat_priv);
|
|
tt_req_list_free(bat_priv);
|
|
tt_changes_list_free(bat_priv);
|
|
tt_roam_list_free(bat_priv);
|
|
|
|
kfree(bat_priv->tt_buff);
|
|
}
|
|
|
|
/* This function will reset the specified flags from all the entries in
|
|
* the given hash table and will increment num_local_tt for each involved
|
|
* entry */
|
|
static void tt_local_reset_flags(struct bat_priv *bat_priv, uint16_t flags)
|
|
{
|
|
int i;
|
|
struct hashtable_t *hash = bat_priv->tt_local_hash;
|
|
struct hlist_head *head;
|
|
struct hlist_node *node;
|
|
struct tt_local_entry *tt_local_entry;
|
|
|
|
if (!hash)
|
|
return;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_local_entry, node,
|
|
head, hash_entry) {
|
|
tt_local_entry->flags &= ~flags;
|
|
atomic_inc(&bat_priv->num_local_tt);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
}
|
|
|
|
/* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
|
|
static void tt_local_purge_pending_clients(struct bat_priv *bat_priv)
|
|
{
|
|
struct hashtable_t *hash = bat_priv->tt_local_hash;
|
|
struct tt_local_entry *tt_local_entry;
|
|
struct hlist_node *node, *node_tmp;
|
|
struct hlist_head *head;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
int i;
|
|
|
|
if (!hash)
|
|
return;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
list_lock = &hash->list_locks[i];
|
|
|
|
spin_lock_bh(list_lock);
|
|
hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
|
|
head, hash_entry) {
|
|
if (!(tt_local_entry->flags & TT_CLIENT_PENDING))
|
|
continue;
|
|
|
|
bat_dbg(DBG_TT, bat_priv, "Deleting local tt entry "
|
|
"(%pM): pending\n", tt_local_entry->addr);
|
|
|
|
atomic_dec(&bat_priv->num_local_tt);
|
|
hlist_del_rcu(node);
|
|
tt_local_entry_free_ref(tt_local_entry);
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
|
|
}
|
|
|
|
void tt_commit_changes(struct bat_priv *bat_priv)
|
|
{
|
|
tt_local_reset_flags(bat_priv, TT_CLIENT_NEW);
|
|
tt_local_purge_pending_clients(bat_priv);
|
|
|
|
/* Increment the TTVN only once per OGM interval */
|
|
atomic_inc(&bat_priv->ttvn);
|
|
bat_priv->tt_poss_change = false;
|
|
}
|