521251f2f5
When trying to add a new tt_local_entry, if such entry already exists, we have to ensure that the TT_CLIENT_PENDING flag is not set, otherwise the entry will be deleted soon. Reported-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2140 lines
58 KiB
C
2140 lines
58 KiB
C
/*
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* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner, Simon Wunderlich, Antonio Quartulli
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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 "bridge_loop_avoidance.h"
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#include <linux/crc16.h>
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static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
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struct orig_node *orig_node);
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static void tt_purge(struct work_struct *work);
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static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry);
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/* returns 1 if they are the same mac addr */
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static int compare_tt(const struct hlist_node *node, const void *data2)
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{
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const void *data1 = container_of(node, struct tt_common_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_common_entry *tt_hash_find(struct hashtable_t *hash,
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const void *data)
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{
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struct hlist_head *head;
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struct hlist_node *node;
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struct tt_common_entry *tt_common_entry, *tt_common_entry_tmp = NULL;
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uint32_t 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_common_entry, node, head, hash_entry) {
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if (!compare_eth(tt_common_entry, data))
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continue;
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if (!atomic_inc_not_zero(&tt_common_entry->refcount))
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continue;
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tt_common_entry_tmp = tt_common_entry;
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break;
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}
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rcu_read_unlock();
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return tt_common_entry_tmp;
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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 tt_common_entry *tt_common_entry;
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struct tt_local_entry *tt_local_entry = NULL;
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tt_common_entry = tt_hash_find(bat_priv->tt_local_hash, data);
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if (tt_common_entry)
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tt_local_entry = container_of(tt_common_entry,
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struct tt_local_entry, common);
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return tt_local_entry;
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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 tt_common_entry *tt_common_entry;
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struct tt_global_entry *tt_global_entry = NULL;
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tt_common_entry = tt_hash_find(bat_priv->tt_global_hash, data);
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if (tt_common_entry)
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tt_global_entry = container_of(tt_common_entry,
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struct tt_global_entry, common);
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return tt_global_entry;
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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->common.refcount))
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kfree_rcu(tt_local_entry, common.rcu);
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}
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static void tt_global_entry_free_rcu(struct rcu_head *rcu)
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{
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struct tt_common_entry *tt_common_entry;
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struct tt_global_entry *tt_global_entry;
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tt_common_entry = container_of(rcu, struct tt_common_entry, rcu);
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tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
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common);
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kfree(tt_global_entry);
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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->common.refcount)) {
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tt_global_del_orig_list(tt_global_entry);
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call_rcu(&tt_global_entry->common.rcu,
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tt_global_entry_free_rcu);
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}
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}
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static void tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
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{
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struct tt_orig_list_entry *orig_entry;
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orig_entry = container_of(rcu, struct tt_orig_list_entry, rcu);
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atomic_dec(&orig_entry->orig_node->tt_size);
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orig_node_free_ref(orig_entry->orig_node);
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kfree(orig_entry);
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}
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static void tt_orig_list_entry_free_ref(struct tt_orig_list_entry *orig_entry)
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{
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call_rcu(&orig_entry->rcu, tt_orig_list_entry_free_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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int ifindex)
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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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struct hlist_head *head;
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struct hlist_node *node;
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struct tt_orig_list_entry *orig_entry;
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int hash_added;
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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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/* possibly unset the TT_CLIENT_PENDING flag */
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tt_local_entry->common.flags &= ~TT_CLIENT_PENDING;
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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->common.addr, addr, ETH_ALEN);
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tt_local_entry->common.flags = NO_FLAGS;
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if (is_wifi_iface(ifindex))
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tt_local_entry->common.flags |= TT_CLIENT_WIFI;
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atomic_set(&tt_local_entry->common.refcount, 2);
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tt_local_entry->last_seen = jiffies;
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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->common.flags |= TT_CLIENT_NOPURGE;
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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->common.flags |= TT_CLIENT_NEW;
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hash_added = hash_add(bat_priv->tt_local_hash, compare_tt, choose_orig,
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&tt_local_entry->common,
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&tt_local_entry->common.hash_entry);
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if (unlikely(hash_added != 0)) {
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/* remove the reference for the hash */
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tt_local_entry_free_ref(tt_local_entry);
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goto out;
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}
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tt_local_event(bat_priv, addr, tt_local_entry->common.flags);
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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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/* These node are probably going to update their tt table */
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head = &tt_global_entry->orig_list;
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rcu_read_lock();
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hlist_for_each_entry_rcu(orig_entry, node, head, list) {
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orig_entry->orig_node->tt_poss_change = true;
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send_roam_adv(bat_priv, tt_global_entry->common.addr,
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orig_entry->orig_node);
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}
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rcu_read_unlock();
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/* The global entry has to be marked as ROAMING and
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* has to be kept for consistency purpose
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*/
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tt_global_entry->common.flags |= TT_CLIENT_ROAM;
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tt_global_entry->roam_at = jiffies;
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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_common_entry *tt_common_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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uint32_t i;
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int 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,
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"BATMAN mesh %s disabled - 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,
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"BATMAN mesh %s disabled - 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,
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"Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
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net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
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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_common_entry, node,
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head, hash_entry) {
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seq_printf(seq, " * %pM [%c%c%c%c%c]\n",
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tt_common_entry->addr,
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(tt_common_entry->flags &
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TT_CLIENT_ROAM ? 'R' : '.'),
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(tt_common_entry->flags &
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TT_CLIENT_NOPURGE ? 'P' : '.'),
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(tt_common_entry->flags &
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TT_CLIENT_NEW ? 'N' : '.'),
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(tt_common_entry->flags &
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TT_CLIENT_PENDING ? 'X' : '.'),
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(tt_common_entry->flags &
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TT_CLIENT_WIFI ? 'W' : '.'));
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}
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rcu_read_unlock();
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}
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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, const char *message)
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{
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tt_local_event(bat_priv, tt_local_entry->common.addr,
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tt_local_entry->common.flags | flags);
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/* The local client has to be marked as "pending to be removed" but has
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* to be kept in the table in order to send it in a full table
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* response issued before the net ttvn increment (consistency check) */
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tt_local_entry->common.flags |= TT_CLIENT_PENDING;
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bat_dbg(DBG_TT, bat_priv,
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"Local tt entry (%pM) pending to be removed: %s\n",
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tt_local_entry->common.addr, message);
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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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|
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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), 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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|
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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 tt_common_entry *tt_common_entry;
|
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struct hlist_node *node, *node_tmp;
|
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struct hlist_head *head;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
uint32_t 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_common_entry, node, node_tmp,
|
|
head, hash_entry) {
|
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tt_local_entry = container_of(tt_common_entry,
|
|
struct tt_local_entry,
|
|
common);
|
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if (tt_local_entry->common.flags & TT_CLIENT_NOPURGE)
|
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continue;
|
|
|
|
/* entry already marked for deletion */
|
|
if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
|
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continue;
|
|
|
|
if (!has_timed_out(tt_local_entry->last_seen,
|
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TT_LOCAL_TIMEOUT))
|
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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, "timed out");
|
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}
|
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spin_unlock_bh(list_lock);
|
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}
|
|
|
|
}
|
|
|
|
static void tt_local_table_free(struct bat_priv *bat_priv)
|
|
{
|
|
struct hashtable_t *hash;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
struct tt_common_entry *tt_common_entry;
|
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struct tt_local_entry *tt_local_entry;
|
|
struct hlist_node *node, *node_tmp;
|
|
struct hlist_head *head;
|
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uint32_t i;
|
|
|
|
if (!bat_priv->tt_local_hash)
|
|
return;
|
|
|
|
hash = bat_priv->tt_local_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_common_entry, node, node_tmp,
|
|
head, hash_entry) {
|
|
hlist_del_rcu(node);
|
|
tt_local_entry = container_of(tt_common_entry,
|
|
struct tt_local_entry,
|
|
common);
|
|
tt_local_entry_free_ref(tt_local_entry);
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
|
|
hash_destroy(hash);
|
|
|
|
bat_priv->tt_local_hash = NULL;
|
|
}
|
|
|
|
static int tt_global_init(struct bat_priv *bat_priv)
|
|
{
|
|
if (bat_priv->tt_global_hash)
|
|
return 1;
|
|
|
|
bat_priv->tt_global_hash = hash_new(1024);
|
|
|
|
if (!bat_priv->tt_global_hash)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void tt_changes_list_free(struct bat_priv *bat_priv)
|
|
{
|
|
struct tt_change_node *entry, *safe;
|
|
|
|
spin_lock_bh(&bat_priv->tt_changes_list_lock);
|
|
|
|
list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
|
|
list) {
|
|
list_del(&entry->list);
|
|
kfree(entry);
|
|
}
|
|
|
|
atomic_set(&bat_priv->tt_local_changes, 0);
|
|
spin_unlock_bh(&bat_priv->tt_changes_list_lock);
|
|
}
|
|
|
|
/* find out if an orig_node is already in the list of a tt_global_entry.
|
|
* returns 1 if found, 0 otherwise
|
|
*/
|
|
static bool tt_global_entry_has_orig(const struct tt_global_entry *entry,
|
|
const struct orig_node *orig_node)
|
|
{
|
|
struct tt_orig_list_entry *tmp_orig_entry;
|
|
const struct hlist_head *head;
|
|
struct hlist_node *node;
|
|
bool found = false;
|
|
|
|
rcu_read_lock();
|
|
head = &entry->orig_list;
|
|
hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) {
|
|
if (tmp_orig_entry->orig_node == orig_node) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return found;
|
|
}
|
|
|
|
static void tt_global_add_orig_entry(struct tt_global_entry *tt_global_entry,
|
|
struct orig_node *orig_node,
|
|
int ttvn)
|
|
{
|
|
struct tt_orig_list_entry *orig_entry;
|
|
|
|
orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
|
|
if (!orig_entry)
|
|
return;
|
|
|
|
INIT_HLIST_NODE(&orig_entry->list);
|
|
atomic_inc(&orig_node->refcount);
|
|
atomic_inc(&orig_node->tt_size);
|
|
orig_entry->orig_node = orig_node;
|
|
orig_entry->ttvn = ttvn;
|
|
|
|
spin_lock_bh(&tt_global_entry->list_lock);
|
|
hlist_add_head_rcu(&orig_entry->list,
|
|
&tt_global_entry->orig_list);
|
|
spin_unlock_bh(&tt_global_entry->list_lock);
|
|
}
|
|
|
|
/* 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,
|
|
bool wifi)
|
|
{
|
|
struct tt_global_entry *tt_global_entry = NULL;
|
|
int ret = 0;
|
|
int hash_added;
|
|
|
|
tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
|
|
|
|
if (!tt_global_entry) {
|
|
tt_global_entry = kzalloc(sizeof(*tt_global_entry),
|
|
GFP_ATOMIC);
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
memcpy(tt_global_entry->common.addr, tt_addr, ETH_ALEN);
|
|
|
|
tt_global_entry->common.flags = NO_FLAGS;
|
|
tt_global_entry->roam_at = 0;
|
|
atomic_set(&tt_global_entry->common.refcount, 2);
|
|
|
|
INIT_HLIST_HEAD(&tt_global_entry->orig_list);
|
|
spin_lock_init(&tt_global_entry->list_lock);
|
|
|
|
hash_added = hash_add(bat_priv->tt_global_hash, compare_tt,
|
|
choose_orig, &tt_global_entry->common,
|
|
&tt_global_entry->common.hash_entry);
|
|
|
|
if (unlikely(hash_added != 0)) {
|
|
/* remove the reference for the hash */
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
goto out_remove;
|
|
}
|
|
|
|
tt_global_add_orig_entry(tt_global_entry, orig_node, ttvn);
|
|
} else {
|
|
/* there is already a global entry, use this one. */
|
|
|
|
/* If there is the TT_CLIENT_ROAM flag set, there is only one
|
|
* originator left in the list and we previously received a
|
|
* delete + roaming change for this originator.
|
|
*
|
|
* We should first delete the old originator before adding the
|
|
* new one.
|
|
*/
|
|
if (tt_global_entry->common.flags & TT_CLIENT_ROAM) {
|
|
tt_global_del_orig_list(tt_global_entry);
|
|
tt_global_entry->common.flags &= ~TT_CLIENT_ROAM;
|
|
tt_global_entry->roam_at = 0;
|
|
}
|
|
|
|
if (!tt_global_entry_has_orig(tt_global_entry, orig_node))
|
|
tt_global_add_orig_entry(tt_global_entry, orig_node,
|
|
ttvn);
|
|
}
|
|
|
|
if (wifi)
|
|
tt_global_entry->common.flags |= TT_CLIENT_WIFI;
|
|
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Creating new global tt entry: %pM (via %pM)\n",
|
|
tt_global_entry->common.addr, orig_node->orig);
|
|
|
|
out_remove:
|
|
/* remove address from local hash if present */
|
|
tt_local_remove(bat_priv, tt_global_entry->common.addr,
|
|
"global tt received", roaming);
|
|
ret = 1;
|
|
out:
|
|
if (tt_global_entry)
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
return ret;
|
|
}
|
|
|
|
/* print all orig nodes who announce the address for this global entry.
|
|
* it is assumed that the caller holds rcu_read_lock();
|
|
*/
|
|
static void tt_global_print_entry(struct tt_global_entry *tt_global_entry,
|
|
struct seq_file *seq)
|
|
{
|
|
struct hlist_head *head;
|
|
struct hlist_node *node;
|
|
struct tt_orig_list_entry *orig_entry;
|
|
struct tt_common_entry *tt_common_entry;
|
|
uint16_t flags;
|
|
uint8_t last_ttvn;
|
|
|
|
tt_common_entry = &tt_global_entry->common;
|
|
|
|
head = &tt_global_entry->orig_list;
|
|
|
|
hlist_for_each_entry_rcu(orig_entry, node, head, list) {
|
|
flags = tt_common_entry->flags;
|
|
last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
|
|
seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c]\n",
|
|
tt_global_entry->common.addr, orig_entry->ttvn,
|
|
orig_entry->orig_node->orig, last_ttvn,
|
|
(flags & TT_CLIENT_ROAM ? 'R' : '.'),
|
|
(flags & TT_CLIENT_WIFI ? 'W' : '.'));
|
|
}
|
|
}
|
|
|
|
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_common_entry *tt_common_entry;
|
|
struct tt_global_entry *tt_global_entry;
|
|
struct hard_iface *primary_if;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
uint32_t i;
|
|
int 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 %s\n",
|
|
"Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_common_entry, node,
|
|
head, hash_entry) {
|
|
tt_global_entry = container_of(tt_common_entry,
|
|
struct tt_global_entry,
|
|
common);
|
|
tt_global_print_entry(tt_global_entry, seq);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
out:
|
|
if (primary_if)
|
|
hardif_free_ref(primary_if);
|
|
return ret;
|
|
}
|
|
|
|
/* deletes the orig list of a tt_global_entry */
|
|
static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry)
|
|
{
|
|
struct hlist_head *head;
|
|
struct hlist_node *node, *safe;
|
|
struct tt_orig_list_entry *orig_entry;
|
|
|
|
spin_lock_bh(&tt_global_entry->list_lock);
|
|
head = &tt_global_entry->orig_list;
|
|
hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
|
|
hlist_del_rcu(node);
|
|
tt_orig_list_entry_free_ref(orig_entry);
|
|
}
|
|
spin_unlock_bh(&tt_global_entry->list_lock);
|
|
|
|
}
|
|
|
|
static void tt_global_del_orig_entry(struct bat_priv *bat_priv,
|
|
struct tt_global_entry *tt_global_entry,
|
|
struct orig_node *orig_node,
|
|
const char *message)
|
|
{
|
|
struct hlist_head *head;
|
|
struct hlist_node *node, *safe;
|
|
struct tt_orig_list_entry *orig_entry;
|
|
|
|
spin_lock_bh(&tt_global_entry->list_lock);
|
|
head = &tt_global_entry->orig_list;
|
|
hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
|
|
if (orig_entry->orig_node == orig_node) {
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Deleting %pM from global tt entry %pM: %s\n",
|
|
orig_node->orig, tt_global_entry->common.addr,
|
|
message);
|
|
hlist_del_rcu(node);
|
|
tt_orig_list_entry_free_ref(orig_entry);
|
|
}
|
|
}
|
|
spin_unlock_bh(&tt_global_entry->list_lock);
|
|
}
|
|
|
|
static void tt_global_del_struct(struct bat_priv *bat_priv,
|
|
struct tt_global_entry *tt_global_entry,
|
|
const char *message)
|
|
{
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Deleting global tt entry %pM: %s\n",
|
|
tt_global_entry->common.addr, message);
|
|
|
|
hash_remove(bat_priv->tt_global_hash, compare_tt, choose_orig,
|
|
tt_global_entry->common.addr);
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
|
|
}
|
|
|
|
/* If the client is to be deleted, we check if it is the last origantor entry
|
|
* within tt_global entry. If yes, we set the TT_CLIENT_ROAM flag and the timer,
|
|
* otherwise we simply remove the originator scheduled for deletion.
|
|
*/
|
|
static void tt_global_del_roaming(struct bat_priv *bat_priv,
|
|
struct tt_global_entry *tt_global_entry,
|
|
struct orig_node *orig_node,
|
|
const char *message)
|
|
{
|
|
bool last_entry = true;
|
|
struct hlist_head *head;
|
|
struct hlist_node *node;
|
|
struct tt_orig_list_entry *orig_entry;
|
|
|
|
/* no local entry exists, case 1:
|
|
* Check if this is the last one or if other entries exist.
|
|
*/
|
|
|
|
rcu_read_lock();
|
|
head = &tt_global_entry->orig_list;
|
|
hlist_for_each_entry_rcu(orig_entry, node, head, list) {
|
|
if (orig_entry->orig_node != orig_node) {
|
|
last_entry = false;
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (last_entry) {
|
|
/* its the last one, mark for roaming. */
|
|
tt_global_entry->common.flags |= TT_CLIENT_ROAM;
|
|
tt_global_entry->roam_at = jiffies;
|
|
} else
|
|
/* there is another entry, we can simply delete this
|
|
* one and can still use the other one.
|
|
*/
|
|
tt_global_del_orig_entry(bat_priv, tt_global_entry,
|
|
orig_node, message);
|
|
}
|
|
|
|
|
|
|
|
static 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;
|
|
struct tt_local_entry *tt_local_entry = NULL;
|
|
|
|
tt_global_entry = tt_global_hash_find(bat_priv, addr);
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
if (!roaming) {
|
|
tt_global_del_orig_entry(bat_priv, tt_global_entry, orig_node,
|
|
message);
|
|
|
|
if (hlist_empty(&tt_global_entry->orig_list))
|
|
tt_global_del_struct(bat_priv, tt_global_entry,
|
|
message);
|
|
|
|
goto out;
|
|
}
|
|
|
|
/* if we are deleting a global entry due to a roam
|
|
* event, there are two possibilities:
|
|
* 1) the client roamed from node A to node B => if there
|
|
* is only one originator left for this client, we mark
|
|
* it with TT_CLIENT_ROAM, we start a timer and we
|
|
* wait for node B to claim it. In case of timeout
|
|
* the entry is purged.
|
|
*
|
|
* If there are other originators left, we directly delete
|
|
* the originator.
|
|
* 2) the client roamed to us => we can directly delete
|
|
* the global entry, since it is useless now. */
|
|
|
|
tt_local_entry = tt_local_hash_find(bat_priv,
|
|
tt_global_entry->common.addr);
|
|
if (tt_local_entry) {
|
|
/* local entry exists, case 2: client roamed to us. */
|
|
tt_global_del_orig_list(tt_global_entry);
|
|
tt_global_del_struct(bat_priv, tt_global_entry, message);
|
|
} else
|
|
/* no local entry exists, case 1: check for roaming */
|
|
tt_global_del_roaming(bat_priv, tt_global_entry, orig_node,
|
|
message);
|
|
|
|
|
|
out:
|
|
if (tt_global_entry)
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
if (tt_local_entry)
|
|
tt_local_entry_free_ref(tt_local_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;
|
|
struct tt_common_entry *tt_common_entry;
|
|
uint32_t 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 */
|
|
|
|
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_common_entry, node, safe,
|
|
head, hash_entry) {
|
|
tt_global_entry = container_of(tt_common_entry,
|
|
struct tt_global_entry,
|
|
common);
|
|
|
|
tt_global_del_orig_entry(bat_priv, tt_global_entry,
|
|
orig_node, message);
|
|
|
|
if (hlist_empty(&tt_global_entry->orig_list)) {
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Deleting global tt entry %pM: %s\n",
|
|
tt_global_entry->common.addr,
|
|
message);
|
|
hlist_del_rcu(node);
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
}
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
atomic_set(&orig_node->tt_size, 0);
|
|
orig_node->tt_initialised = false;
|
|
}
|
|
|
|
static void tt_global_roam_purge(struct bat_priv *bat_priv)
|
|
{
|
|
struct hashtable_t *hash = bat_priv->tt_global_hash;
|
|
struct tt_common_entry *tt_common_entry;
|
|
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 */
|
|
uint32_t 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_common_entry, node, node_tmp,
|
|
head, hash_entry) {
|
|
tt_global_entry = container_of(tt_common_entry,
|
|
struct tt_global_entry,
|
|
common);
|
|
if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM))
|
|
continue;
|
|
if (!has_timed_out(tt_global_entry->roam_at,
|
|
TT_CLIENT_ROAM_TIMEOUT))
|
|
continue;
|
|
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Deleting global tt entry (%pM): Roaming timeout\n",
|
|
tt_global_entry->common.addr);
|
|
|
|
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_common_entry *tt_common_entry;
|
|
struct tt_global_entry *tt_global_entry;
|
|
struct hlist_node *node, *node_tmp;
|
|
struct hlist_head *head;
|
|
uint32_t 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_common_entry, node, node_tmp,
|
|
head, hash_entry) {
|
|
hlist_del_rcu(node);
|
|
tt_global_entry = container_of(tt_common_entry,
|
|
struct tt_global_entry,
|
|
common);
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
|
|
hash_destroy(hash);
|
|
|
|
bat_priv->tt_global_hash = NULL;
|
|
}
|
|
|
|
static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry,
|
|
struct tt_global_entry *tt_global_entry)
|
|
{
|
|
bool ret = false;
|
|
|
|
if (tt_local_entry->common.flags & TT_CLIENT_WIFI &&
|
|
tt_global_entry->common.flags & TT_CLIENT_WIFI)
|
|
ret = true;
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct orig_node *transtable_search(struct bat_priv *bat_priv,
|
|
const uint8_t *src, const uint8_t *addr)
|
|
{
|
|
struct tt_local_entry *tt_local_entry = NULL;
|
|
struct tt_global_entry *tt_global_entry = NULL;
|
|
struct orig_node *orig_node = NULL;
|
|
struct neigh_node *router = NULL;
|
|
struct hlist_head *head;
|
|
struct hlist_node *node;
|
|
struct tt_orig_list_entry *orig_entry;
|
|
int best_tq;
|
|
|
|
if (src && atomic_read(&bat_priv->ap_isolation)) {
|
|
tt_local_entry = tt_local_hash_find(bat_priv, src);
|
|
if (!tt_local_entry)
|
|
goto out;
|
|
}
|
|
|
|
tt_global_entry = tt_global_hash_find(bat_priv, addr);
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
/* check whether the clients should not communicate due to AP
|
|
* isolation */
|
|
if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry))
|
|
goto out;
|
|
|
|
best_tq = 0;
|
|
|
|
rcu_read_lock();
|
|
head = &tt_global_entry->orig_list;
|
|
hlist_for_each_entry_rcu(orig_entry, node, head, list) {
|
|
router = orig_node_get_router(orig_entry->orig_node);
|
|
if (!router)
|
|
continue;
|
|
|
|
if (router->tq_avg > best_tq) {
|
|
orig_node = orig_entry->orig_node;
|
|
best_tq = router->tq_avg;
|
|
}
|
|
neigh_node_free_ref(router);
|
|
}
|
|
/* found anything? */
|
|
if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
|
|
orig_node = NULL;
|
|
rcu_read_unlock();
|
|
out:
|
|
if (tt_global_entry)
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
if (tt_local_entry)
|
|
tt_local_entry_free_ref(tt_local_entry);
|
|
|
|
return orig_node;
|
|
}
|
|
|
|
/* Calculates the checksum of the local table of a given orig_node */
|
|
static 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_common_entry *tt_common_entry;
|
|
struct tt_global_entry *tt_global_entry;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
uint32_t i;
|
|
int j;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_common_entry, node,
|
|
head, hash_entry) {
|
|
tt_global_entry = container_of(tt_common_entry,
|
|
struct tt_global_entry,
|
|
common);
|
|
/* 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->common.flags & TT_CLIENT_ROAM)
|
|
continue;
|
|
|
|
/* find out if this global entry is announced by this
|
|
* originator
|
|
*/
|
|
if (!tt_global_entry_has_orig(tt_global_entry,
|
|
orig_node))
|
|
continue;
|
|
|
|
total_one = 0;
|
|
for (j = 0; j < ETH_ALEN; j++)
|
|
total_one = crc16_byte(total_one,
|
|
tt_global_entry->common.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_common_entry *tt_common_entry;
|
|
struct hlist_node *node;
|
|
struct hlist_head *head;
|
|
uint32_t i;
|
|
int j;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_common_entry, node,
|
|
head, hash_entry) {
|
|
/* not yet committed clients have not to be taken into
|
|
* account while computing the CRC */
|
|
if (tt_common_entry->flags & TT_CLIENT_NEW)
|
|
continue;
|
|
total_one = 0;
|
|
for (j = 0; j < ETH_ALEN; j++)
|
|
total_one = crc16_byte(total_one,
|
|
tt_common_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);
|
|
}
|
|
|
|
static 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 (has_timed_out(node->issued_at, TT_REQUEST_TIMEOUT)) {
|
|
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) &&
|
|
!has_timed_out(tt_req_node_tmp->issued_at,
|
|
TT_REQUEST_TIMEOUT))
|
|
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_common_entry *tt_common_entry = entry_ptr;
|
|
|
|
if (tt_common_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_common_entry *tt_common_entry = entry_ptr;
|
|
const struct tt_global_entry *tt_global_entry;
|
|
const struct orig_node *orig_node = data_ptr;
|
|
|
|
if (tt_common_entry->flags & TT_CLIENT_ROAM)
|
|
return 0;
|
|
|
|
tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
|
|
common);
|
|
|
|
return tt_global_entry_has_orig(tt_global_entry, 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_common_entry *tt_common_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);
|
|
uint32_t 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_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_common_entry, node,
|
|
head, hash_entry) {
|
|
if (tt_count == tt_tot)
|
|
break;
|
|
|
|
if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
|
|
continue;
|
|
|
|
memcpy(tt_change->addr, tt_common_entry->addr,
|
|
ETH_ALEN);
|
|
tt_change->flags = NO_FLAGS;
|
|
|
|
tt_count++;
|
|
tt_change++;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
/* store in the message the number of entries we have successfully
|
|
* copied */
|
|
tt_response->tt_data = htons(tt_count);
|
|
|
|
out:
|
|
return skb;
|
|
}
|
|
|
|
static 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->header.packet_type = BAT_TT_QUERY;
|
|
tt_request->header.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->header.ttl = TTL;
|
|
tt_request->ttvn = ttvn;
|
|
tt_request->tt_data = htons(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 = orig_hash_find(bat_priv, tt_request->dst);
|
|
if (!req_dst_orig_node)
|
|
goto out;
|
|
|
|
res_dst_orig_node = orig_hash_find(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 don't have the requested data */
|
|
if (orig_ttvn != req_ttvn ||
|
|
tt_request->tt_data != req_dst_orig_node->tt_crc)
|
|
goto out;
|
|
|
|
/* If the full table has been explicitly requested */
|
|
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->header.packet_type = BAT_TT_QUERY;
|
|
tt_response->header.version = COMPAT_VERSION;
|
|
tt_response->header.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 = orig_hash_find(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->header.packet_type = BAT_TT_QUERY;
|
|
tt_response->header.version = COMPAT_VERSION;
|
|
tt_response->header.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)) {
|
|
/* don't answer backbone gws! */
|
|
if (bla_is_backbone_gw_orig(bat_priv, tt_request->src))
|
|
return true;
|
|
|
|
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,
|
|
(tt_change + i)->flags &
|
|
TT_CLIENT_WIFI))
|
|
/* 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;
|
|
}
|
|
orig_node->tt_initialised = true;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static 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->common.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' : '.'));
|
|
|
|
/* we should have never asked a backbone gw */
|
|
if (bla_is_backbone_gw_orig(bat_priv, tt_response->src))
|
|
goto out;
|
|
|
|
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 (!has_timed_out(node->first_time, ROAMING_MAX_TIME))
|
|
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 (has_timed_out(tt_roam_node->first_time, ROAMING_MAX_TIME))
|
|
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;
|
|
}
|
|
|
|
static 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->header.packet_type = BAT_ROAM_ADV;
|
|
roam_adv_packet->header.version = COMPAT_VERSION;
|
|
roam_adv_packet->header.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 enable or disable the specified flags for all the entries
|
|
* in the given hash table and returns the number of modified entries */
|
|
static uint16_t tt_set_flags(struct hashtable_t *hash, uint16_t flags,
|
|
bool enable)
|
|
{
|
|
uint32_t i;
|
|
uint16_t changed_num = 0;
|
|
struct hlist_head *head;
|
|
struct hlist_node *node;
|
|
struct tt_common_entry *tt_common_entry;
|
|
|
|
if (!hash)
|
|
goto out;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_common_entry, node,
|
|
head, hash_entry) {
|
|
if (enable) {
|
|
if ((tt_common_entry->flags & flags) == flags)
|
|
continue;
|
|
tt_common_entry->flags |= flags;
|
|
} else {
|
|
if (!(tt_common_entry->flags & flags))
|
|
continue;
|
|
tt_common_entry->flags &= ~flags;
|
|
}
|
|
changed_num++;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
out:
|
|
return changed_num;
|
|
}
|
|
|
|
/* 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_common_entry *tt_common_entry;
|
|
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 */
|
|
uint32_t 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_common_entry, node, node_tmp,
|
|
head, hash_entry) {
|
|
if (!(tt_common_entry->flags & TT_CLIENT_PENDING))
|
|
continue;
|
|
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"Deleting local tt entry (%pM): pending\n",
|
|
tt_common_entry->addr);
|
|
|
|
atomic_dec(&bat_priv->num_local_tt);
|
|
hlist_del_rcu(node);
|
|
tt_local_entry = container_of(tt_common_entry,
|
|
struct tt_local_entry,
|
|
common);
|
|
tt_local_entry_free_ref(tt_local_entry);
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
|
|
}
|
|
|
|
void tt_commit_changes(struct bat_priv *bat_priv)
|
|
{
|
|
uint16_t changed_num = tt_set_flags(bat_priv->tt_local_hash,
|
|
TT_CLIENT_NEW, false);
|
|
/* all the reset entries have now to be effectively counted as local
|
|
* entries */
|
|
atomic_add(changed_num, &bat_priv->num_local_tt);
|
|
tt_local_purge_pending_clients(bat_priv);
|
|
|
|
/* Increment the TTVN only once per OGM interval */
|
|
atomic_inc(&bat_priv->ttvn);
|
|
bat_dbg(DBG_TT, bat_priv, "Local changes committed, updating to ttvn %u\n",
|
|
(uint8_t)atomic_read(&bat_priv->ttvn));
|
|
bat_priv->tt_poss_change = false;
|
|
}
|
|
|
|
bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst)
|
|
{
|
|
struct tt_local_entry *tt_local_entry = NULL;
|
|
struct tt_global_entry *tt_global_entry = NULL;
|
|
bool ret = true;
|
|
|
|
if (!atomic_read(&bat_priv->ap_isolation))
|
|
return false;
|
|
|
|
tt_local_entry = tt_local_hash_find(bat_priv, dst);
|
|
if (!tt_local_entry)
|
|
goto out;
|
|
|
|
tt_global_entry = tt_global_hash_find(bat_priv, src);
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
if (_is_ap_isolated(tt_local_entry, tt_global_entry))
|
|
goto out;
|
|
|
|
ret = false;
|
|
|
|
out:
|
|
if (tt_global_entry)
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
if (tt_local_entry)
|
|
tt_local_entry_free_ref(tt_local_entry);
|
|
return ret;
|
|
}
|
|
|
|
void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node,
|
|
const unsigned char *tt_buff, uint8_t tt_num_changes,
|
|
uint8_t ttvn, uint16_t tt_crc)
|
|
{
|
|
uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
|
|
bool full_table = true;
|
|
|
|
/* don't care about a backbone gateways updates. */
|
|
if (bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
|
|
return;
|
|
|
|
/* orig table not initialised AND first diff is in the OGM OR the ttvn
|
|
* increased by one -> we can apply the attached changes */
|
|
if ((!orig_node->tt_initialised && ttvn == 1) ||
|
|
ttvn - orig_ttvn == 1) {
|
|
/* the OGM could not contain the changes due to their size or
|
|
* because they have already been sent TT_OGM_APPEND_MAX times.
|
|
* In this case send a tt request */
|
|
if (!tt_num_changes) {
|
|
full_table = false;
|
|
goto request_table;
|
|
}
|
|
|
|
tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn,
|
|
(struct tt_change *)tt_buff);
|
|
|
|
/* Even if we received the precomputed crc with the OGM, we
|
|
* prefer to recompute it to spot any possible inconsistency
|
|
* in the global table */
|
|
orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
|
|
|
|
/* The ttvn alone is not enough to guarantee consistency
|
|
* because a single value could represent different states
|
|
* (due to the wrap around). Thus a node has to check whether
|
|
* the resulting table (after applying the changes) is still
|
|
* consistent or not. E.g. a node could disconnect while its
|
|
* ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
|
|
* checking the CRC value is mandatory to detect the
|
|
* inconsistency */
|
|
if (orig_node->tt_crc != tt_crc)
|
|
goto request_table;
|
|
|
|
/* Roaming phase is over: tables are in sync again. I can
|
|
* unset the flag */
|
|
orig_node->tt_poss_change = false;
|
|
} else {
|
|
/* if we missed more than one change or our tables are not
|
|
* in sync anymore -> request fresh tt data */
|
|
|
|
if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
|
|
orig_node->tt_crc != tt_crc) {
|
|
request_table:
|
|
bat_dbg(DBG_TT, bat_priv,
|
|
"TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n",
|
|
orig_node->orig, ttvn, orig_ttvn, tt_crc,
|
|
orig_node->tt_crc, tt_num_changes);
|
|
send_tt_request(bat_priv, orig_node, ttvn, tt_crc,
|
|
full_table);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* returns true whether we know that the client has moved from its old
|
|
* originator to another one. This entry is kept is still kept for consistency
|
|
* purposes
|
|
*/
|
|
bool tt_global_client_is_roaming(struct bat_priv *bat_priv, uint8_t *addr)
|
|
{
|
|
struct tt_global_entry *tt_global_entry;
|
|
bool ret = false;
|
|
|
|
tt_global_entry = tt_global_hash_find(bat_priv, addr);
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
ret = tt_global_entry->common.flags & TT_CLIENT_ROAM;
|
|
tt_global_entry_free_ref(tt_global_entry);
|
|
out:
|
|
return ret;
|
|
}
|