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![Sven Eckelmann](/assets/img/avatar_default.png)
Some functions already have documentation about locks they require inside their kerneldoc header. These can be directly tested during runtime using the lockdep asserts. Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
3778 lines
112 KiB
C
3778 lines
112 KiB
C
/* Copyright (C) 2007-2015 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "translation-table.h"
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#include "main.h"
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#include <linux/atomic.h>
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#include <linux/bitops.h>
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#include <linux/bug.h>
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#include <linux/byteorder/generic.h>
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#include <linux/compiler.h>
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#include <linux/crc32c.h>
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#include <linux/errno.h>
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#include <linux/etherdevice.h>
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#include <linux/fs.h>
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#include <linux/if_ether.h>
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#include <linux/jhash.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/lockdep.h>
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#include <linux/netdevice.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/stddef.h>
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#include <linux/string.h>
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#include <linux/workqueue.h>
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#include <net/net_namespace.h>
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#include "bridge_loop_avoidance.h"
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#include "hard-interface.h"
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#include "hash.h"
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#include "multicast.h"
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#include "originator.h"
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#include "packet.h"
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#include "soft-interface.h"
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/* hash class keys */
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static struct lock_class_key batadv_tt_local_hash_lock_class_key;
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static struct lock_class_key batadv_tt_global_hash_lock_class_key;
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static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
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unsigned short vid,
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struct batadv_orig_node *orig_node);
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static void batadv_tt_purge(struct work_struct *work);
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static void
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batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
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static void batadv_tt_global_del(struct batadv_priv *bat_priv,
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struct batadv_orig_node *orig_node,
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const unsigned char *addr,
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unsigned short vid, const char *message,
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bool roaming);
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/* returns 1 if they are the same mac addr */
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static int batadv_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 batadv_tt_common_entry,
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hash_entry);
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return batadv_compare_eth(data1, data2);
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}
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/**
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* batadv_choose_tt - return the index of the tt entry in the hash table
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* @data: pointer to the tt_common_entry object to map
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* @size: the size of the hash table
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*
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* Returns the hash index where the object represented by 'data' should be
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* stored at.
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*/
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static inline u32 batadv_choose_tt(const void *data, u32 size)
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{
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struct batadv_tt_common_entry *tt;
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u32 hash = 0;
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tt = (struct batadv_tt_common_entry *)data;
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hash = jhash(&tt->addr, ETH_ALEN, hash);
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hash = jhash(&tt->vid, sizeof(tt->vid), hash);
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return hash % size;
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}
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/**
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* batadv_tt_hash_find - look for a client in the given hash table
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* @hash: the hash table to search
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* @addr: the mac address of the client to look for
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* @vid: VLAN identifier
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*
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* Returns a pointer to the tt_common struct belonging to the searched client if
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* found, NULL otherwise.
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*/
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static struct batadv_tt_common_entry *
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batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
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unsigned short vid)
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{
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struct hlist_head *head;
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struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
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u32 index;
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if (!hash)
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return NULL;
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ether_addr_copy(to_search.addr, addr);
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to_search.vid = vid;
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index = batadv_choose_tt(&to_search, 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, head, hash_entry) {
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if (!batadv_compare_eth(tt, addr))
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continue;
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if (tt->vid != vid)
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continue;
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if (!atomic_inc_not_zero(&tt->refcount))
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continue;
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tt_tmp = tt;
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break;
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}
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rcu_read_unlock();
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return tt_tmp;
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}
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/**
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* batadv_tt_local_hash_find - search the local table for a given client
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* @bat_priv: the bat priv with all the soft interface information
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* @addr: the mac address of the client to look for
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* @vid: VLAN identifier
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*
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* Returns a pointer to the corresponding tt_local_entry struct if the client is
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* found, NULL otherwise.
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*/
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static struct batadv_tt_local_entry *
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batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
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unsigned short vid)
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{
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struct batadv_tt_common_entry *tt_common_entry;
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struct batadv_tt_local_entry *tt_local_entry = NULL;
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tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
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vid);
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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 batadv_tt_local_entry,
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common);
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return tt_local_entry;
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}
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/**
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* batadv_tt_global_hash_find - search the global table for a given client
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* @bat_priv: the bat priv with all the soft interface information
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* @addr: the mac address of the client to look for
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* @vid: VLAN identifier
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*
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* Returns a pointer to the corresponding tt_global_entry struct if the client
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* is found, NULL otherwise.
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*/
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static struct batadv_tt_global_entry *
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batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
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unsigned short vid)
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{
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struct batadv_tt_common_entry *tt_common_entry;
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struct batadv_tt_global_entry *tt_global_entry = NULL;
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tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
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vid);
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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 batadv_tt_global_entry,
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common);
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return tt_global_entry;
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}
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static void
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batadv_tt_local_entry_free_ref(struct batadv_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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/**
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* batadv_tt_global_entry_free_ref - decrement the refcounter for a
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* tt_global_entry and possibly free it
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* @tt_global_entry: the object to free
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*/
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static void
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batadv_tt_global_entry_free_ref(struct batadv_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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batadv_tt_global_del_orig_list(tt_global_entry);
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kfree_rcu(tt_global_entry, common.rcu);
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}
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}
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/**
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* batadv_tt_global_hash_count - count the number of orig entries
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* @hash: hash table containing the tt entries
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* @addr: the mac address of the client to count entries for
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* @vid: VLAN identifier
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*
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* Return the number of originators advertising the given address/data
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* (excluding ourself).
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*/
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int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
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const u8 *addr, unsigned short vid)
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{
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struct batadv_tt_global_entry *tt_global_entry;
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int count;
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tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
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if (!tt_global_entry)
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return 0;
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count = atomic_read(&tt_global_entry->orig_list_count);
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batadv_tt_global_entry_free_ref(tt_global_entry);
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return count;
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}
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static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
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{
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struct batadv_tt_orig_list_entry *orig_entry;
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orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
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/* We are in an rcu callback here, therefore we cannot use
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* batadv_orig_node_free_ref() and its call_rcu():
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* An rcu_barrier() wouldn't wait for that to finish
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*/
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batadv_orig_node_free_ref_now(orig_entry->orig_node);
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kfree(orig_entry);
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}
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/**
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* batadv_tt_local_size_mod - change the size by v of the local table identified
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* by vid
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* @bat_priv: the bat priv with all the soft interface information
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* @vid: the VLAN identifier of the sub-table to change
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* @v: the amount to sum to the local table size
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*/
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static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
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unsigned short vid, int v)
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{
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struct batadv_softif_vlan *vlan;
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vlan = batadv_softif_vlan_get(bat_priv, vid);
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if (!vlan)
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return;
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atomic_add(v, &vlan->tt.num_entries);
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batadv_softif_vlan_free_ref(vlan);
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}
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/**
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* batadv_tt_local_size_inc - increase by one the local table size for the given
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* vid
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* @bat_priv: the bat priv with all the soft interface information
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* @vid: the VLAN identifier
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*/
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static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
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unsigned short vid)
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{
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batadv_tt_local_size_mod(bat_priv, vid, 1);
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}
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/**
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* batadv_tt_local_size_dec - decrease by one the local table size for the given
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* vid
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* @bat_priv: the bat priv with all the soft interface information
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* @vid: the VLAN identifier
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*/
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static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
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unsigned short vid)
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{
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batadv_tt_local_size_mod(bat_priv, vid, -1);
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}
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/**
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* batadv_tt_global_size_mod - change the size by v of the local table
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* identified by vid
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* @bat_priv: the bat priv with all the soft interface information
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* @vid: the VLAN identifier
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* @v: the amount to sum to the global table size
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*/
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static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
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unsigned short vid, int v)
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{
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struct batadv_orig_node_vlan *vlan;
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vlan = batadv_orig_node_vlan_new(orig_node, vid);
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if (!vlan)
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return;
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if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
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spin_lock_bh(&orig_node->vlan_list_lock);
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hlist_del_init_rcu(&vlan->list);
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spin_unlock_bh(&orig_node->vlan_list_lock);
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batadv_orig_node_vlan_free_ref(vlan);
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}
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batadv_orig_node_vlan_free_ref(vlan);
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}
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/**
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* batadv_tt_global_size_inc - increase by one the global table size for the
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* given vid
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* @orig_node: the originator which global table size has to be decreased
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* @vid: the vlan identifier
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*/
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static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
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unsigned short vid)
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{
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batadv_tt_global_size_mod(orig_node, vid, 1);
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}
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/**
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* batadv_tt_global_size_dec - decrease by one the global table size for the
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* given vid
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* @orig_node: the originator which global table size has to be decreased
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* @vid: the vlan identifier
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*/
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static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
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unsigned short vid)
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{
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batadv_tt_global_size_mod(orig_node, vid, -1);
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}
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static void
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batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
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{
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if (!atomic_dec_and_test(&orig_entry->refcount))
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return;
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call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
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}
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/**
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* batadv_tt_local_event - store a local TT event (ADD/DEL)
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* @bat_priv: the bat priv with all the soft interface information
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* @tt_local_entry: the TT entry involved in the event
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* @event_flags: flags to store in the event structure
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*/
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static void batadv_tt_local_event(struct batadv_priv *bat_priv,
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struct batadv_tt_local_entry *tt_local_entry,
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u8 event_flags)
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{
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struct batadv_tt_change_node *tt_change_node, *entry, *safe;
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struct batadv_tt_common_entry *common = &tt_local_entry->common;
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u8 flags = common->flags | event_flags;
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bool event_removed = false;
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bool del_op_requested, del_op_entry;
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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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memset(tt_change_node->change.reserved, 0,
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sizeof(tt_change_node->change.reserved));
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ether_addr_copy(tt_change_node->change.addr, common->addr);
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tt_change_node->change.vid = htons(common->vid);
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del_op_requested = flags & BATADV_TT_CLIENT_DEL;
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/* check for ADD+DEL or DEL+ADD events */
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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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if (!batadv_compare_eth(entry->change.addr, common->addr))
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continue;
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/* DEL+ADD in the same orig interval have no effect and can be
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* removed to avoid silly behaviour on the receiver side. The
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* other way around (ADD+DEL) can happen in case of roaming of
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* a client still in the NEW state. Roaming of NEW clients is
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* now possible due to automatically recognition of "temporary"
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* clients
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*/
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del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
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if (!del_op_requested && del_op_entry)
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goto del;
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if (del_op_requested && !del_op_entry)
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goto del;
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/* this is a second add in the same originator interval. It
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* means that flags have been changed: update them!
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*/
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if (!del_op_requested && !del_op_entry)
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entry->change.flags = flags;
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continue;
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del:
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list_del(&entry->list);
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kfree(entry);
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kfree(tt_change_node);
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event_removed = true;
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goto unlock;
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}
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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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unlock:
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spin_unlock_bh(&bat_priv->tt.changes_list_lock);
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if (event_removed)
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atomic_dec(&bat_priv->tt.local_changes);
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else
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atomic_inc(&bat_priv->tt.local_changes);
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}
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/**
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* batadv_tt_len - compute length in bytes of given number of tt changes
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* @changes_num: number of tt changes
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*
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* Returns computed length in bytes.
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*/
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static int batadv_tt_len(int changes_num)
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{
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return changes_num * sizeof(struct batadv_tvlv_tt_change);
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}
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/**
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* batadv_tt_entries - compute the number of entries fitting in tt_len bytes
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* @tt_len: available space
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*
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* Returns the number of entries.
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*/
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static u16 batadv_tt_entries(u16 tt_len)
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{
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return tt_len / batadv_tt_len(1);
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}
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/**
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* batadv_tt_local_table_transmit_size - calculates the local translation table
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* size when transmitted over the air
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* @bat_priv: the bat priv with all the soft interface information
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*
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* Returns local translation table size in bytes.
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*/
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static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
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{
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u16 num_vlan = 0;
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u16 tt_local_entries = 0;
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struct batadv_softif_vlan *vlan;
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int hdr_size;
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rcu_read_lock();
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hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
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num_vlan++;
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tt_local_entries += atomic_read(&vlan->tt.num_entries);
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}
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rcu_read_unlock();
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/* header size of tvlv encapsulated tt response payload */
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hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
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hdr_size += sizeof(struct batadv_tvlv_hdr);
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hdr_size += sizeof(struct batadv_tvlv_tt_data);
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hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
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|
|
return hdr_size + batadv_tt_len(tt_local_entries);
|
|
}
|
|
|
|
static int batadv_tt_local_init(struct batadv_priv *bat_priv)
|
|
{
|
|
if (bat_priv->tt.local_hash)
|
|
return 0;
|
|
|
|
bat_priv->tt.local_hash = batadv_hash_new(1024);
|
|
|
|
if (!bat_priv->tt.local_hash)
|
|
return -ENOMEM;
|
|
|
|
batadv_hash_set_lock_class(bat_priv->tt.local_hash,
|
|
&batadv_tt_local_hash_lock_class_key);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void batadv_tt_global_free(struct batadv_priv *bat_priv,
|
|
struct batadv_tt_global_entry *tt_global,
|
|
const char *message)
|
|
{
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Deleting global tt entry %pM (vid: %d): %s\n",
|
|
tt_global->common.addr,
|
|
BATADV_PRINT_VID(tt_global->common.vid), message);
|
|
|
|
batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
|
|
batadv_choose_tt, &tt_global->common);
|
|
batadv_tt_global_entry_free_ref(tt_global);
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_local_add - add a new client to the local table or update an
|
|
* existing client
|
|
* @soft_iface: netdev struct of the mesh interface
|
|
* @addr: the mac address of the client to add
|
|
* @vid: VLAN identifier
|
|
* @ifindex: index of the interface where the client is connected to (useful to
|
|
* identify wireless clients)
|
|
* @mark: the value contained in the skb->mark field of the received packet (if
|
|
* any)
|
|
*
|
|
* Returns true if the client was successfully added, false otherwise.
|
|
*/
|
|
bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
|
|
unsigned short vid, int ifindex, u32 mark)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
|
|
struct batadv_tt_local_entry *tt_local;
|
|
struct batadv_tt_global_entry *tt_global = NULL;
|
|
struct batadv_softif_vlan *vlan;
|
|
struct net_device *in_dev = NULL;
|
|
struct hlist_head *head;
|
|
struct batadv_tt_orig_list_entry *orig_entry;
|
|
int hash_added, table_size, packet_size_max;
|
|
bool ret = false;
|
|
bool roamed_back = false;
|
|
u8 remote_flags;
|
|
u32 match_mark;
|
|
|
|
if (ifindex != BATADV_NULL_IFINDEX)
|
|
in_dev = dev_get_by_index(&init_net, ifindex);
|
|
|
|
tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
|
|
|
|
if (!is_multicast_ether_addr(addr))
|
|
tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
|
|
|
|
if (tt_local) {
|
|
tt_local->last_seen = jiffies;
|
|
if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Re-adding pending client %pM (vid: %d)\n",
|
|
addr, BATADV_PRINT_VID(vid));
|
|
/* whatever the reason why the PENDING flag was set,
|
|
* this is a client which was enqueued to be removed in
|
|
* this orig_interval. Since it popped up again, the
|
|
* flag can be reset like it was never enqueued
|
|
*/
|
|
tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
|
|
goto add_event;
|
|
}
|
|
|
|
if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Roaming client %pM (vid: %d) came back to its original location\n",
|
|
addr, BATADV_PRINT_VID(vid));
|
|
/* the ROAM flag is set because this client roamed away
|
|
* and the node got a roaming_advertisement message. Now
|
|
* that the client popped up again at its original
|
|
* location such flag can be unset
|
|
*/
|
|
tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
|
|
roamed_back = true;
|
|
}
|
|
goto check_roaming;
|
|
}
|
|
|
|
/* Ignore the client if we cannot send it in a full table response. */
|
|
table_size = batadv_tt_local_table_transmit_size(bat_priv);
|
|
table_size += batadv_tt_len(1);
|
|
packet_size_max = atomic_read(&bat_priv->packet_size_max);
|
|
if (table_size > packet_size_max) {
|
|
net_ratelimited_function(batadv_info, soft_iface,
|
|
"Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
|
|
table_size, packet_size_max, addr);
|
|
goto out;
|
|
}
|
|
|
|
tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
|
|
if (!tt_local)
|
|
goto out;
|
|
|
|
/* increase the refcounter of the related vlan */
|
|
vlan = batadv_softif_vlan_get(bat_priv, vid);
|
|
if (WARN(!vlan, "adding TT local entry %pM to non-existent VLAN %d",
|
|
addr, BATADV_PRINT_VID(vid))) {
|
|
kfree(tt_local);
|
|
tt_local = NULL;
|
|
goto out;
|
|
}
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
|
|
addr, BATADV_PRINT_VID(vid),
|
|
(u8)atomic_read(&bat_priv->tt.vn));
|
|
|
|
ether_addr_copy(tt_local->common.addr, addr);
|
|
/* The local entry has to be marked as NEW to avoid to send it in
|
|
* a full table response going out before the next ttvn increment
|
|
* (consistency check)
|
|
*/
|
|
tt_local->common.flags = BATADV_TT_CLIENT_NEW;
|
|
tt_local->common.vid = vid;
|
|
if (batadv_is_wifi_netdev(in_dev))
|
|
tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
|
|
atomic_set(&tt_local->common.refcount, 2);
|
|
tt_local->last_seen = jiffies;
|
|
tt_local->common.added_at = tt_local->last_seen;
|
|
|
|
/* the batman interface mac and multicast addresses should never be
|
|
* purged
|
|
*/
|
|
if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
|
|
is_multicast_ether_addr(addr))
|
|
tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
|
|
|
|
hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
|
|
batadv_choose_tt, &tt_local->common,
|
|
&tt_local->common.hash_entry);
|
|
|
|
if (unlikely(hash_added != 0)) {
|
|
/* remove the reference for the hash */
|
|
batadv_tt_local_entry_free_ref(tt_local);
|
|
batadv_softif_vlan_free_ref(vlan);
|
|
goto out;
|
|
}
|
|
|
|
add_event:
|
|
batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
|
|
|
|
check_roaming:
|
|
/* Check whether it is a roaming, but don't do anything if the roaming
|
|
* process has already been handled
|
|
*/
|
|
if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
|
|
/* These node are probably going to update their tt table */
|
|
head = &tt_global->orig_list;
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(orig_entry, head, list) {
|
|
batadv_send_roam_adv(bat_priv, tt_global->common.addr,
|
|
tt_global->common.vid,
|
|
orig_entry->orig_node);
|
|
}
|
|
rcu_read_unlock();
|
|
if (roamed_back) {
|
|
batadv_tt_global_free(bat_priv, tt_global,
|
|
"Roaming canceled");
|
|
tt_global = NULL;
|
|
} else {
|
|
/* The global entry has to be marked as ROAMING and
|
|
* has to be kept for consistency purpose
|
|
*/
|
|
tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
|
|
tt_global->roam_at = jiffies;
|
|
}
|
|
}
|
|
|
|
/* store the current remote flags before altering them. This helps
|
|
* understanding is flags are changing or not
|
|
*/
|
|
remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
|
|
|
|
if (batadv_is_wifi_netdev(in_dev))
|
|
tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
|
|
else
|
|
tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
|
|
|
|
/* check the mark in the skb: if it's equal to the configured
|
|
* isolation_mark, it means the packet is coming from an isolated
|
|
* non-mesh client
|
|
*/
|
|
match_mark = (mark & bat_priv->isolation_mark_mask);
|
|
if (bat_priv->isolation_mark_mask &&
|
|
match_mark == bat_priv->isolation_mark)
|
|
tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
|
|
else
|
|
tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
|
|
|
|
/* if any "dynamic" flag has been modified, resend an ADD event for this
|
|
* entry so that all the nodes can get the new flags
|
|
*/
|
|
if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
|
|
batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
|
|
|
|
ret = true;
|
|
out:
|
|
if (in_dev)
|
|
dev_put(in_dev);
|
|
if (tt_local)
|
|
batadv_tt_local_entry_free_ref(tt_local);
|
|
if (tt_global)
|
|
batadv_tt_global_entry_free_ref(tt_global);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
|
|
* within a TT Response directed to another node
|
|
* @orig_node: originator for which the TT data has to be prepared
|
|
* @tt_data: uninitialised pointer to the address of the TVLV buffer
|
|
* @tt_change: uninitialised pointer to the address of the area where the TT
|
|
* changed can be stored
|
|
* @tt_len: pointer to the length to reserve to the tt_change. if -1 this
|
|
* function reserves the amount of space needed to send the entire global TT
|
|
* table. In case of success the value is updated with the real amount of
|
|
* reserved bytes
|
|
|
|
* Allocate the needed amount of memory for the entire TT TVLV and write its
|
|
* header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
|
|
* objects, one per active VLAN served by the originator node.
|
|
*
|
|
* Return the size of the allocated buffer or 0 in case of failure.
|
|
*/
|
|
static u16
|
|
batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
|
|
struct batadv_tvlv_tt_data **tt_data,
|
|
struct batadv_tvlv_tt_change **tt_change,
|
|
s32 *tt_len)
|
|
{
|
|
u16 num_vlan = 0;
|
|
u16 num_entries = 0;
|
|
u16 change_offset;
|
|
u16 tvlv_len;
|
|
struct batadv_tvlv_tt_vlan_data *tt_vlan;
|
|
struct batadv_orig_node_vlan *vlan;
|
|
u8 *tt_change_ptr;
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
|
|
num_vlan++;
|
|
num_entries += atomic_read(&vlan->tt.num_entries);
|
|
}
|
|
|
|
change_offset = sizeof(**tt_data);
|
|
change_offset += num_vlan * sizeof(*tt_vlan);
|
|
|
|
/* if tt_len is negative, allocate the space needed by the full table */
|
|
if (*tt_len < 0)
|
|
*tt_len = batadv_tt_len(num_entries);
|
|
|
|
tvlv_len = *tt_len;
|
|
tvlv_len += change_offset;
|
|
|
|
*tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
|
|
if (!*tt_data) {
|
|
*tt_len = 0;
|
|
goto out;
|
|
}
|
|
|
|
(*tt_data)->flags = BATADV_NO_FLAGS;
|
|
(*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
|
|
(*tt_data)->num_vlan = htons(num_vlan);
|
|
|
|
tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
|
|
hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
|
|
tt_vlan->vid = htons(vlan->vid);
|
|
tt_vlan->crc = htonl(vlan->tt.crc);
|
|
|
|
tt_vlan++;
|
|
}
|
|
|
|
tt_change_ptr = (u8 *)*tt_data + change_offset;
|
|
*tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return tvlv_len;
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
|
|
* node
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @tt_data: uninitialised pointer to the address of the TVLV buffer
|
|
* @tt_change: uninitialised pointer to the address of the area where the TT
|
|
* changes can be stored
|
|
* @tt_len: pointer to the length to reserve to the tt_change. if -1 this
|
|
* function reserves the amount of space needed to send the entire local TT
|
|
* table. In case of success the value is updated with the real amount of
|
|
* reserved bytes
|
|
*
|
|
* Allocate the needed amount of memory for the entire TT TVLV and write its
|
|
* header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
|
|
* objects, one per active VLAN.
|
|
*
|
|
* Return the size of the allocated buffer or 0 in case of failure.
|
|
*/
|
|
static u16
|
|
batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
|
|
struct batadv_tvlv_tt_data **tt_data,
|
|
struct batadv_tvlv_tt_change **tt_change,
|
|
s32 *tt_len)
|
|
{
|
|
struct batadv_tvlv_tt_vlan_data *tt_vlan;
|
|
struct batadv_softif_vlan *vlan;
|
|
u16 num_vlan = 0;
|
|
u16 num_entries = 0;
|
|
u16 tvlv_len;
|
|
u8 *tt_change_ptr;
|
|
int change_offset;
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
|
|
num_vlan++;
|
|
num_entries += atomic_read(&vlan->tt.num_entries);
|
|
}
|
|
|
|
change_offset = sizeof(**tt_data);
|
|
change_offset += num_vlan * sizeof(*tt_vlan);
|
|
|
|
/* if tt_len is negative, allocate the space needed by the full table */
|
|
if (*tt_len < 0)
|
|
*tt_len = batadv_tt_len(num_entries);
|
|
|
|
tvlv_len = *tt_len;
|
|
tvlv_len += change_offset;
|
|
|
|
*tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
|
|
if (!*tt_data) {
|
|
tvlv_len = 0;
|
|
goto out;
|
|
}
|
|
|
|
(*tt_data)->flags = BATADV_NO_FLAGS;
|
|
(*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
|
|
(*tt_data)->num_vlan = htons(num_vlan);
|
|
|
|
tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
|
|
hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
|
|
tt_vlan->vid = htons(vlan->vid);
|
|
tt_vlan->crc = htonl(vlan->tt.crc);
|
|
|
|
tt_vlan++;
|
|
}
|
|
|
|
tt_change_ptr = (u8 *)*tt_data + change_offset;
|
|
*tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return tvlv_len;
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_tvlv_container_update - update the translation table tvlv container
|
|
* after local tt changes have been committed
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
*/
|
|
static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_tt_change_node *entry, *safe;
|
|
struct batadv_tvlv_tt_data *tt_data;
|
|
struct batadv_tvlv_tt_change *tt_change;
|
|
int tt_diff_len, tt_change_len = 0;
|
|
int tt_diff_entries_num = 0;
|
|
int tt_diff_entries_count = 0;
|
|
u16 tvlv_len;
|
|
|
|
tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
|
|
tt_diff_len = batadv_tt_len(tt_diff_entries_num);
|
|
|
|
/* if we have too many changes for one packet don't send any
|
|
* and wait for the tt table request which will be fragmented
|
|
*/
|
|
if (tt_diff_len > bat_priv->soft_iface->mtu)
|
|
tt_diff_len = 0;
|
|
|
|
tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
|
|
&tt_change, &tt_diff_len);
|
|
if (!tvlv_len)
|
|
return;
|
|
|
|
tt_data->flags = BATADV_TT_OGM_DIFF;
|
|
|
|
if (tt_diff_len == 0)
|
|
goto container_register;
|
|
|
|
spin_lock_bh(&bat_priv->tt.changes_list_lock);
|
|
atomic_set(&bat_priv->tt.local_changes, 0);
|
|
|
|
list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
|
|
list) {
|
|
if (tt_diff_entries_count < tt_diff_entries_num) {
|
|
memcpy(tt_change + tt_diff_entries_count,
|
|
&entry->change,
|
|
sizeof(struct batadv_tvlv_tt_change));
|
|
tt_diff_entries_count++;
|
|
}
|
|
list_del(&entry->list);
|
|
kfree(entry);
|
|
}
|
|
spin_unlock_bh(&bat_priv->tt.changes_list_lock);
|
|
|
|
/* Keep the buffer for possible tt_request */
|
|
spin_lock_bh(&bat_priv->tt.last_changeset_lock);
|
|
kfree(bat_priv->tt.last_changeset);
|
|
bat_priv->tt.last_changeset_len = 0;
|
|
bat_priv->tt.last_changeset = NULL;
|
|
tt_change_len = batadv_tt_len(tt_diff_entries_count);
|
|
/* check whether this new OGM has no changes due to size problems */
|
|
if (tt_diff_entries_count > 0) {
|
|
/* if kmalloc() fails we will reply with the full table
|
|
* instead of providing the diff
|
|
*/
|
|
bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
|
|
if (bat_priv->tt.last_changeset) {
|
|
memcpy(bat_priv->tt.last_changeset,
|
|
tt_change, tt_change_len);
|
|
bat_priv->tt.last_changeset_len = tt_diff_len;
|
|
}
|
|
}
|
|
spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
|
|
|
|
container_register:
|
|
batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
|
|
tvlv_len);
|
|
kfree(tt_data);
|
|
}
|
|
|
|
int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
|
|
{
|
|
struct net_device *net_dev = (struct net_device *)seq->private;
|
|
struct batadv_priv *bat_priv = netdev_priv(net_dev);
|
|
struct batadv_hashtable *hash = bat_priv->tt.local_hash;
|
|
struct batadv_tt_common_entry *tt_common_entry;
|
|
struct batadv_tt_local_entry *tt_local;
|
|
struct batadv_hard_iface *primary_if;
|
|
struct batadv_softif_vlan *vlan;
|
|
struct hlist_head *head;
|
|
unsigned short vid;
|
|
u32 i;
|
|
int last_seen_secs;
|
|
int last_seen_msecs;
|
|
unsigned long last_seen_jiffies;
|
|
bool no_purge;
|
|
u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
|
|
|
|
primary_if = batadv_seq_print_text_primary_if_get(seq);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
seq_printf(seq,
|
|
"Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
|
|
net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
|
|
seq_printf(seq, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
|
|
"Flags", "Last seen", "CRC");
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_common_entry,
|
|
head, hash_entry) {
|
|
tt_local = container_of(tt_common_entry,
|
|
struct batadv_tt_local_entry,
|
|
common);
|
|
vid = tt_common_entry->vid;
|
|
last_seen_jiffies = jiffies - tt_local->last_seen;
|
|
last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
|
|
last_seen_secs = last_seen_msecs / 1000;
|
|
last_seen_msecs = last_seen_msecs % 1000;
|
|
|
|
no_purge = tt_common_entry->flags & np_flag;
|
|
|
|
vlan = batadv_softif_vlan_get(bat_priv, vid);
|
|
if (!vlan) {
|
|
seq_printf(seq, "Cannot retrieve VLAN %d\n",
|
|
BATADV_PRINT_VID(vid));
|
|
continue;
|
|
}
|
|
|
|
seq_printf(seq,
|
|
" * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
|
|
tt_common_entry->addr,
|
|
BATADV_PRINT_VID(tt_common_entry->vid),
|
|
((tt_common_entry->flags &
|
|
BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
|
|
no_purge ? 'P' : '.',
|
|
((tt_common_entry->flags &
|
|
BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
|
|
((tt_common_entry->flags &
|
|
BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
|
|
((tt_common_entry->flags &
|
|
BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
|
|
((tt_common_entry->flags &
|
|
BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
|
|
no_purge ? 0 : last_seen_secs,
|
|
no_purge ? 0 : last_seen_msecs,
|
|
vlan->tt.crc);
|
|
|
|
batadv_softif_vlan_free_ref(vlan);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
|
|
struct batadv_tt_local_entry *tt_local_entry,
|
|
u16 flags, const char *message)
|
|
{
|
|
batadv_tt_local_event(bat_priv, tt_local_entry, flags);
|
|
|
|
/* The local client has to be marked as "pending to be removed" but has
|
|
* to be kept in the table in order to send it in a full table
|
|
* response issued before the net ttvn increment (consistency check)
|
|
*/
|
|
tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
|
|
tt_local_entry->common.addr,
|
|
BATADV_PRINT_VID(tt_local_entry->common.vid), message);
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_local_remove - logically remove an entry from the local table
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @addr: the MAC address of the client to remove
|
|
* @vid: VLAN identifier
|
|
* @message: message to append to the log on deletion
|
|
* @roaming: true if the deletion is due to a roaming event
|
|
*
|
|
* Returns the flags assigned to the local entry before being deleted
|
|
*/
|
|
u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
|
|
unsigned short vid, const char *message,
|
|
bool roaming)
|
|
{
|
|
struct batadv_tt_local_entry *tt_local_entry;
|
|
u16 flags, curr_flags = BATADV_NO_FLAGS;
|
|
struct batadv_softif_vlan *vlan;
|
|
void *tt_entry_exists;
|
|
|
|
tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
|
|
if (!tt_local_entry)
|
|
goto out;
|
|
|
|
curr_flags = tt_local_entry->common.flags;
|
|
|
|
flags = BATADV_TT_CLIENT_DEL;
|
|
/* if this global entry addition is due to a roaming, the node has to
|
|
* mark the local entry as "roamed" in order to correctly reroute
|
|
* packets later
|
|
*/
|
|
if (roaming) {
|
|
flags |= BATADV_TT_CLIENT_ROAM;
|
|
/* mark the local client as ROAMed */
|
|
tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
|
|
}
|
|
|
|
if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
|
|
batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
|
|
message);
|
|
goto out;
|
|
}
|
|
/* if this client has been added right now, it is possible to
|
|
* immediately purge it
|
|
*/
|
|
batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
|
|
|
|
tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
|
|
batadv_compare_tt,
|
|
batadv_choose_tt,
|
|
&tt_local_entry->common);
|
|
if (!tt_entry_exists)
|
|
goto out;
|
|
|
|
/* extra call to free the local tt entry */
|
|
batadv_tt_local_entry_free_ref(tt_local_entry);
|
|
|
|
/* decrease the reference held for this vlan */
|
|
vlan = batadv_softif_vlan_get(bat_priv, vid);
|
|
if (!vlan)
|
|
goto out;
|
|
|
|
batadv_softif_vlan_free_ref(vlan);
|
|
batadv_softif_vlan_free_ref(vlan);
|
|
|
|
out:
|
|
if (tt_local_entry)
|
|
batadv_tt_local_entry_free_ref(tt_local_entry);
|
|
|
|
return curr_flags;
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_local_purge_list - purge inactive tt local entries
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @head: pointer to the list containing the local tt entries
|
|
* @timeout: parameter deciding whether a given tt local entry is considered
|
|
* inactive or not
|
|
*/
|
|
static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
|
|
struct hlist_head *head,
|
|
int timeout)
|
|
{
|
|
struct batadv_tt_local_entry *tt_local_entry;
|
|
struct batadv_tt_common_entry *tt_common_entry;
|
|
struct hlist_node *node_tmp;
|
|
|
|
hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
|
|
hash_entry) {
|
|
tt_local_entry = container_of(tt_common_entry,
|
|
struct batadv_tt_local_entry,
|
|
common);
|
|
if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
|
|
continue;
|
|
|
|
/* entry already marked for deletion */
|
|
if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
|
|
continue;
|
|
|
|
if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
|
|
continue;
|
|
|
|
batadv_tt_local_set_pending(bat_priv, tt_local_entry,
|
|
BATADV_TT_CLIENT_DEL, "timed out");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_local_purge - purge inactive tt local entries
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @timeout: parameter deciding whether a given tt local entry is considered
|
|
* inactive or not
|
|
*/
|
|
static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
|
|
int timeout)
|
|
{
|
|
struct batadv_hashtable *hash = bat_priv->tt.local_hash;
|
|
struct hlist_head *head;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
u32 i;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
list_lock = &hash->list_locks[i];
|
|
|
|
spin_lock_bh(list_lock);
|
|
batadv_tt_local_purge_list(bat_priv, head, timeout);
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
}
|
|
|
|
static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_hashtable *hash;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
struct batadv_tt_common_entry *tt_common_entry;
|
|
struct batadv_tt_local_entry *tt_local;
|
|
struct batadv_softif_vlan *vlan;
|
|
struct hlist_node *node_tmp;
|
|
struct hlist_head *head;
|
|
u32 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_tmp,
|
|
head, hash_entry) {
|
|
hlist_del_rcu(&tt_common_entry->hash_entry);
|
|
tt_local = container_of(tt_common_entry,
|
|
struct batadv_tt_local_entry,
|
|
common);
|
|
|
|
/* decrease the reference held for this vlan */
|
|
vlan = batadv_softif_vlan_get(bat_priv,
|
|
tt_common_entry->vid);
|
|
if (vlan) {
|
|
batadv_softif_vlan_free_ref(vlan);
|
|
batadv_softif_vlan_free_ref(vlan);
|
|
}
|
|
|
|
batadv_tt_local_entry_free_ref(tt_local);
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
|
|
batadv_hash_destroy(hash);
|
|
|
|
bat_priv->tt.local_hash = NULL;
|
|
}
|
|
|
|
static int batadv_tt_global_init(struct batadv_priv *bat_priv)
|
|
{
|
|
if (bat_priv->tt.global_hash)
|
|
return 0;
|
|
|
|
bat_priv->tt.global_hash = batadv_hash_new(1024);
|
|
|
|
if (!bat_priv->tt.global_hash)
|
|
return -ENOMEM;
|
|
|
|
batadv_hash_set_lock_class(bat_priv->tt.global_hash,
|
|
&batadv_tt_global_hash_lock_class_key);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_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);
|
|
}
|
|
|
|
/* retrieves the orig_tt_list_entry belonging to orig_node from the
|
|
* batadv_tt_global_entry list
|
|
*
|
|
* returns it with an increased refcounter, NULL if not found
|
|
*/
|
|
static struct batadv_tt_orig_list_entry *
|
|
batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
|
|
const struct batadv_orig_node *orig_node)
|
|
{
|
|
struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
|
|
const struct hlist_head *head;
|
|
|
|
rcu_read_lock();
|
|
head = &entry->orig_list;
|
|
hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
|
|
if (tmp_orig_entry->orig_node != orig_node)
|
|
continue;
|
|
if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
|
|
continue;
|
|
|
|
orig_entry = tmp_orig_entry;
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return orig_entry;
|
|
}
|
|
|
|
/* find out if an orig_node is already in the list of a tt_global_entry.
|
|
* returns true if found, false otherwise
|
|
*/
|
|
static bool
|
|
batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
|
|
const struct batadv_orig_node *orig_node)
|
|
{
|
|
struct batadv_tt_orig_list_entry *orig_entry;
|
|
bool found = false;
|
|
|
|
orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
|
|
if (orig_entry) {
|
|
found = true;
|
|
batadv_tt_orig_list_entry_free_ref(orig_entry);
|
|
}
|
|
|
|
return found;
|
|
}
|
|
|
|
static void
|
|
batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
|
|
struct batadv_orig_node *orig_node, int ttvn)
|
|
{
|
|
struct batadv_tt_orig_list_entry *orig_entry;
|
|
|
|
orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
|
|
if (orig_entry) {
|
|
/* refresh the ttvn: the current value could be a bogus one that
|
|
* was added during a "temporary client detection"
|
|
*/
|
|
orig_entry->ttvn = ttvn;
|
|
goto out;
|
|
}
|
|
|
|
orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
|
|
if (!orig_entry)
|
|
goto out;
|
|
|
|
INIT_HLIST_NODE(&orig_entry->list);
|
|
atomic_inc(&orig_node->refcount);
|
|
batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
|
|
orig_entry->orig_node = orig_node;
|
|
orig_entry->ttvn = ttvn;
|
|
atomic_set(&orig_entry->refcount, 2);
|
|
|
|
spin_lock_bh(&tt_global->list_lock);
|
|
hlist_add_head_rcu(&orig_entry->list,
|
|
&tt_global->orig_list);
|
|
spin_unlock_bh(&tt_global->list_lock);
|
|
atomic_inc(&tt_global->orig_list_count);
|
|
|
|
out:
|
|
if (orig_entry)
|
|
batadv_tt_orig_list_entry_free_ref(orig_entry);
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_global_add - add a new TT global entry or update an existing one
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig_node: the originator announcing the client
|
|
* @tt_addr: the mac address of the non-mesh client
|
|
* @vid: VLAN identifier
|
|
* @flags: TT flags that have to be set for this non-mesh client
|
|
* @ttvn: the tt version number ever announcing this non-mesh client
|
|
*
|
|
* Add a new TT global entry for the given originator. If the entry already
|
|
* exists add a new reference to the given originator (a global entry can have
|
|
* references to multiple originators) and adjust the flags attribute to reflect
|
|
* the function argument.
|
|
* If a TT local entry exists for this non-mesh client remove it.
|
|
*
|
|
* The caller must hold orig_node refcount.
|
|
*
|
|
* Return true if the new entry has been added, false otherwise
|
|
*/
|
|
static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
const unsigned char *tt_addr,
|
|
unsigned short vid, u16 flags, u8 ttvn)
|
|
{
|
|
struct batadv_tt_global_entry *tt_global_entry;
|
|
struct batadv_tt_local_entry *tt_local_entry;
|
|
bool ret = false;
|
|
int hash_added;
|
|
struct batadv_tt_common_entry *common;
|
|
u16 local_flags;
|
|
|
|
/* ignore global entries from backbone nodes */
|
|
if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
|
|
return true;
|
|
|
|
tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
|
|
tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
|
|
|
|
/* if the node already has a local client for this entry, it has to wait
|
|
* for a roaming advertisement instead of manually messing up the global
|
|
* table
|
|
*/
|
|
if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
|
|
!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
|
|
goto out;
|
|
|
|
if (!tt_global_entry) {
|
|
tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
common = &tt_global_entry->common;
|
|
ether_addr_copy(common->addr, tt_addr);
|
|
common->vid = vid;
|
|
|
|
common->flags = flags;
|
|
tt_global_entry->roam_at = 0;
|
|
/* node must store current time in case of roaming. This is
|
|
* needed to purge this entry out on timeout (if nobody claims
|
|
* it)
|
|
*/
|
|
if (flags & BATADV_TT_CLIENT_ROAM)
|
|
tt_global_entry->roam_at = jiffies;
|
|
atomic_set(&common->refcount, 2);
|
|
common->added_at = jiffies;
|
|
|
|
INIT_HLIST_HEAD(&tt_global_entry->orig_list);
|
|
atomic_set(&tt_global_entry->orig_list_count, 0);
|
|
spin_lock_init(&tt_global_entry->list_lock);
|
|
|
|
hash_added = batadv_hash_add(bat_priv->tt.global_hash,
|
|
batadv_compare_tt,
|
|
batadv_choose_tt, common,
|
|
&common->hash_entry);
|
|
|
|
if (unlikely(hash_added != 0)) {
|
|
/* remove the reference for the hash */
|
|
batadv_tt_global_entry_free_ref(tt_global_entry);
|
|
goto out_remove;
|
|
}
|
|
} else {
|
|
common = &tt_global_entry->common;
|
|
/* If there is already a global entry, we can use this one for
|
|
* our processing.
|
|
* But if we are trying to add a temporary client then here are
|
|
* two options at this point:
|
|
* 1) the global client is not a temporary client: the global
|
|
* client has to be left as it is, temporary information
|
|
* should never override any already known client state
|
|
* 2) the global client is a temporary client: purge the
|
|
* originator list and add the new one orig_entry
|
|
*/
|
|
if (flags & BATADV_TT_CLIENT_TEMP) {
|
|
if (!(common->flags & BATADV_TT_CLIENT_TEMP))
|
|
goto out;
|
|
if (batadv_tt_global_entry_has_orig(tt_global_entry,
|
|
orig_node))
|
|
goto out_remove;
|
|
batadv_tt_global_del_orig_list(tt_global_entry);
|
|
goto add_orig_entry;
|
|
}
|
|
|
|
/* if the client was temporary added before receiving the first
|
|
* OGM announcing it, we have to clear the TEMP flag
|
|
*/
|
|
common->flags &= ~BATADV_TT_CLIENT_TEMP;
|
|
|
|
/* the change can carry possible "attribute" flags like the
|
|
* TT_CLIENT_WIFI, therefore they have to be copied in the
|
|
* client entry
|
|
*/
|
|
tt_global_entry->common.flags |= flags;
|
|
|
|
/* If there is the BATADV_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 (common->flags & BATADV_TT_CLIENT_ROAM) {
|
|
batadv_tt_global_del_orig_list(tt_global_entry);
|
|
common->flags &= ~BATADV_TT_CLIENT_ROAM;
|
|
tt_global_entry->roam_at = 0;
|
|
}
|
|
}
|
|
add_orig_entry:
|
|
/* add the new orig_entry (if needed) or update it */
|
|
batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Creating new global tt entry: %pM (vid: %d, via %pM)\n",
|
|
common->addr, BATADV_PRINT_VID(common->vid),
|
|
orig_node->orig);
|
|
ret = true;
|
|
|
|
out_remove:
|
|
/* Do not remove multicast addresses from the local hash on
|
|
* global additions
|
|
*/
|
|
if (is_multicast_ether_addr(tt_addr))
|
|
goto out;
|
|
|
|
/* remove address from local hash if present */
|
|
local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
|
|
"global tt received",
|
|
flags & BATADV_TT_CLIENT_ROAM);
|
|
tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
|
|
|
|
if (!(flags & BATADV_TT_CLIENT_ROAM))
|
|
/* this is a normal global add. Therefore the client is not in a
|
|
* roaming state anymore.
|
|
*/
|
|
tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
|
|
|
|
out:
|
|
if (tt_global_entry)
|
|
batadv_tt_global_entry_free_ref(tt_global_entry);
|
|
if (tt_local_entry)
|
|
batadv_tt_local_entry_free_ref(tt_local_entry);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_transtable_best_orig - Get best originator list entry from tt entry
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @tt_global_entry: global translation table entry to be analyzed
|
|
*
|
|
* This functon assumes the caller holds rcu_read_lock().
|
|
* Returns best originator list entry or NULL on errors.
|
|
*/
|
|
static struct batadv_tt_orig_list_entry *
|
|
batadv_transtable_best_orig(struct batadv_priv *bat_priv,
|
|
struct batadv_tt_global_entry *tt_global_entry)
|
|
{
|
|
struct batadv_neigh_node *router, *best_router = NULL;
|
|
struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
|
|
struct hlist_head *head;
|
|
struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
|
|
|
|
head = &tt_global_entry->orig_list;
|
|
hlist_for_each_entry_rcu(orig_entry, head, list) {
|
|
router = batadv_orig_router_get(orig_entry->orig_node,
|
|
BATADV_IF_DEFAULT);
|
|
if (!router)
|
|
continue;
|
|
|
|
if (best_router &&
|
|
bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
|
|
best_router, BATADV_IF_DEFAULT) <= 0) {
|
|
batadv_neigh_node_free_ref(router);
|
|
continue;
|
|
}
|
|
|
|
/* release the refcount for the "old" best */
|
|
if (best_router)
|
|
batadv_neigh_node_free_ref(best_router);
|
|
|
|
best_entry = orig_entry;
|
|
best_router = router;
|
|
}
|
|
|
|
if (best_router)
|
|
batadv_neigh_node_free_ref(best_router);
|
|
|
|
return best_entry;
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_global_print_entry - print all orig nodes who announce the address
|
|
* for this global entry
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @tt_global_entry: global translation table entry to be printed
|
|
* @seq: debugfs table seq_file struct
|
|
*
|
|
* This functon assumes the caller holds rcu_read_lock().
|
|
*/
|
|
static void
|
|
batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
|
|
struct batadv_tt_global_entry *tt_global_entry,
|
|
struct seq_file *seq)
|
|
{
|
|
struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
|
|
struct batadv_tt_common_entry *tt_common_entry;
|
|
struct batadv_orig_node_vlan *vlan;
|
|
struct hlist_head *head;
|
|
u8 last_ttvn;
|
|
u16 flags;
|
|
|
|
tt_common_entry = &tt_global_entry->common;
|
|
flags = tt_common_entry->flags;
|
|
|
|
best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
|
|
if (best_entry) {
|
|
vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
|
|
tt_common_entry->vid);
|
|
if (!vlan) {
|
|
seq_printf(seq,
|
|
" * Cannot retrieve VLAN %d for originator %pM\n",
|
|
BATADV_PRINT_VID(tt_common_entry->vid),
|
|
best_entry->orig_node->orig);
|
|
goto print_list;
|
|
}
|
|
|
|
last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
|
|
seq_printf(seq,
|
|
" %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
|
|
'*', tt_global_entry->common.addr,
|
|
BATADV_PRINT_VID(tt_global_entry->common.vid),
|
|
best_entry->ttvn, best_entry->orig_node->orig,
|
|
last_ttvn, vlan->tt.crc,
|
|
((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
|
|
((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
|
|
((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
|
|
((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
|
|
|
|
batadv_orig_node_vlan_free_ref(vlan);
|
|
}
|
|
|
|
print_list:
|
|
head = &tt_global_entry->orig_list;
|
|
|
|
hlist_for_each_entry_rcu(orig_entry, head, list) {
|
|
if (best_entry == orig_entry)
|
|
continue;
|
|
|
|
vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
|
|
tt_common_entry->vid);
|
|
if (!vlan) {
|
|
seq_printf(seq,
|
|
" + Cannot retrieve VLAN %d for originator %pM\n",
|
|
BATADV_PRINT_VID(tt_common_entry->vid),
|
|
orig_entry->orig_node->orig);
|
|
continue;
|
|
}
|
|
|
|
last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
|
|
seq_printf(seq,
|
|
" %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
|
|
'+', tt_global_entry->common.addr,
|
|
BATADV_PRINT_VID(tt_global_entry->common.vid),
|
|
orig_entry->ttvn, orig_entry->orig_node->orig,
|
|
last_ttvn, vlan->tt.crc,
|
|
((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
|
|
((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
|
|
((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
|
|
((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
|
|
|
|
batadv_orig_node_vlan_free_ref(vlan);
|
|
}
|
|
}
|
|
|
|
int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
|
|
{
|
|
struct net_device *net_dev = (struct net_device *)seq->private;
|
|
struct batadv_priv *bat_priv = netdev_priv(net_dev);
|
|
struct batadv_hashtable *hash = bat_priv->tt.global_hash;
|
|
struct batadv_tt_common_entry *tt_common_entry;
|
|
struct batadv_tt_global_entry *tt_global;
|
|
struct batadv_hard_iface *primary_if;
|
|
struct hlist_head *head;
|
|
u32 i;
|
|
|
|
primary_if = batadv_seq_print_text_primary_if_get(seq);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
seq_printf(seq,
|
|
"Globally announced TT entries received via the mesh %s\n",
|
|
net_dev->name);
|
|
seq_printf(seq, " %-13s %s %s %-15s %s (%-10s) %s\n",
|
|
"Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
|
|
"CRC", "Flags");
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_common_entry,
|
|
head, hash_entry) {
|
|
tt_global = container_of(tt_common_entry,
|
|
struct batadv_tt_global_entry,
|
|
common);
|
|
batadv_tt_global_print_entry(bat_priv, tt_global, seq);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* _batadv_tt_global_del_orig_entry - remove and free an orig_entry
|
|
* @tt_global_entry: the global entry to remove the orig_entry from
|
|
* @orig_entry: the orig entry to remove and free
|
|
*
|
|
* Remove an orig_entry from its list in the given tt_global_entry and
|
|
* free this orig_entry afterwards.
|
|
*
|
|
* Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
|
|
* part of a list.
|
|
*/
|
|
static void
|
|
_batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
|
|
struct batadv_tt_orig_list_entry *orig_entry)
|
|
{
|
|
lockdep_assert_held(&tt_global_entry->list_lock);
|
|
|
|
batadv_tt_global_size_dec(orig_entry->orig_node,
|
|
tt_global_entry->common.vid);
|
|
atomic_dec(&tt_global_entry->orig_list_count);
|
|
/* requires holding tt_global_entry->list_lock and orig_entry->list
|
|
* being part of a list
|
|
*/
|
|
hlist_del_rcu(&orig_entry->list);
|
|
batadv_tt_orig_list_entry_free_ref(orig_entry);
|
|
}
|
|
|
|
/* deletes the orig list of a tt_global_entry */
|
|
static void
|
|
batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
|
|
{
|
|
struct hlist_head *head;
|
|
struct hlist_node *safe;
|
|
struct batadv_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, safe, head, list)
|
|
_batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
|
|
spin_unlock_bh(&tt_global_entry->list_lock);
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @tt_global_entry: the global entry to remove the orig_node from
|
|
* @orig_node: the originator announcing the client
|
|
* @message: message to append to the log on deletion
|
|
*
|
|
* Remove the given orig_node and its according orig_entry from the given
|
|
* global tt entry.
|
|
*/
|
|
static void
|
|
batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
|
|
struct batadv_tt_global_entry *tt_global_entry,
|
|
struct batadv_orig_node *orig_node,
|
|
const char *message)
|
|
{
|
|
struct hlist_head *head;
|
|
struct hlist_node *safe;
|
|
struct batadv_tt_orig_list_entry *orig_entry;
|
|
unsigned short vid;
|
|
|
|
spin_lock_bh(&tt_global_entry->list_lock);
|
|
head = &tt_global_entry->orig_list;
|
|
hlist_for_each_entry_safe(orig_entry, safe, head, list) {
|
|
if (orig_entry->orig_node == orig_node) {
|
|
vid = tt_global_entry->common.vid;
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Deleting %pM from global tt entry %pM (vid: %d): %s\n",
|
|
orig_node->orig,
|
|
tt_global_entry->common.addr,
|
|
BATADV_PRINT_VID(vid), message);
|
|
_batadv_tt_global_del_orig_entry(tt_global_entry,
|
|
orig_entry);
|
|
}
|
|
}
|
|
spin_unlock_bh(&tt_global_entry->list_lock);
|
|
}
|
|
|
|
/* 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 BATADV_TT_CLIENT_ROAM flag and the
|
|
* timer, otherwise we simply remove the originator scheduled for deletion.
|
|
*/
|
|
static void
|
|
batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
|
|
struct batadv_tt_global_entry *tt_global_entry,
|
|
struct batadv_orig_node *orig_node,
|
|
const char *message)
|
|
{
|
|
bool last_entry = true;
|
|
struct hlist_head *head;
|
|
struct batadv_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, 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 |= BATADV_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.
|
|
*/
|
|
batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
|
|
orig_node, message);
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_global_del - remove a client from the global table
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig_node: an originator serving this client
|
|
* @addr: the mac address of the client
|
|
* @vid: VLAN identifier
|
|
* @message: a message explaining the reason for deleting the client to print
|
|
* for debugging purpose
|
|
* @roaming: true if the deletion has been triggered by a roaming event
|
|
*/
|
|
static void batadv_tt_global_del(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
const unsigned char *addr, unsigned short vid,
|
|
const char *message, bool roaming)
|
|
{
|
|
struct batadv_tt_global_entry *tt_global_entry;
|
|
struct batadv_tt_local_entry *local_entry = NULL;
|
|
|
|
tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
if (!roaming) {
|
|
batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
|
|
orig_node, message);
|
|
|
|
if (hlist_empty(&tt_global_entry->orig_list))
|
|
batadv_tt_global_free(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 BATADV_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.
|
|
*/
|
|
local_entry = batadv_tt_local_hash_find(bat_priv,
|
|
tt_global_entry->common.addr,
|
|
vid);
|
|
if (local_entry) {
|
|
/* local entry exists, case 2: client roamed to us. */
|
|
batadv_tt_global_del_orig_list(tt_global_entry);
|
|
batadv_tt_global_free(bat_priv, tt_global_entry, message);
|
|
} else
|
|
/* no local entry exists, case 1: check for roaming */
|
|
batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
|
|
orig_node, message);
|
|
|
|
out:
|
|
if (tt_global_entry)
|
|
batadv_tt_global_entry_free_ref(tt_global_entry);
|
|
if (local_entry)
|
|
batadv_tt_local_entry_free_ref(local_entry);
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_global_del_orig - remove all the TT global entries belonging to the
|
|
* given originator matching the provided vid
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig_node: the originator owning the entries to remove
|
|
* @match_vid: the VLAN identifier to match. If negative all the entries will be
|
|
* removed
|
|
* @message: debug message to print as "reason"
|
|
*/
|
|
void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
s32 match_vid,
|
|
const char *message)
|
|
{
|
|
struct batadv_tt_global_entry *tt_global;
|
|
struct batadv_tt_common_entry *tt_common_entry;
|
|
u32 i;
|
|
struct batadv_hashtable *hash = bat_priv->tt.global_hash;
|
|
struct hlist_node *safe;
|
|
struct hlist_head *head;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
unsigned short vid;
|
|
|
|
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, safe,
|
|
head, hash_entry) {
|
|
/* remove only matching entries */
|
|
if (match_vid >= 0 && tt_common_entry->vid != match_vid)
|
|
continue;
|
|
|
|
tt_global = container_of(tt_common_entry,
|
|
struct batadv_tt_global_entry,
|
|
common);
|
|
|
|
batadv_tt_global_del_orig_node(bat_priv, tt_global,
|
|
orig_node, message);
|
|
|
|
if (hlist_empty(&tt_global->orig_list)) {
|
|
vid = tt_global->common.vid;
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Deleting global tt entry %pM (vid: %d): %s\n",
|
|
tt_global->common.addr,
|
|
BATADV_PRINT_VID(vid), message);
|
|
hlist_del_rcu(&tt_common_entry->hash_entry);
|
|
batadv_tt_global_entry_free_ref(tt_global);
|
|
}
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
|
|
}
|
|
|
|
static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
|
|
char **msg)
|
|
{
|
|
bool purge = false;
|
|
unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
|
|
unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
|
|
|
|
if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
|
|
batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
|
|
purge = true;
|
|
*msg = "Roaming timeout\n";
|
|
}
|
|
|
|
if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
|
|
batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
|
|
purge = true;
|
|
*msg = "Temporary client timeout\n";
|
|
}
|
|
|
|
return purge;
|
|
}
|
|
|
|
static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_hashtable *hash = bat_priv->tt.global_hash;
|
|
struct hlist_head *head;
|
|
struct hlist_node *node_tmp;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
u32 i;
|
|
char *msg = NULL;
|
|
struct batadv_tt_common_entry *tt_common;
|
|
struct batadv_tt_global_entry *tt_global;
|
|
|
|
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, node_tmp, head,
|
|
hash_entry) {
|
|
tt_global = container_of(tt_common,
|
|
struct batadv_tt_global_entry,
|
|
common);
|
|
|
|
if (!batadv_tt_global_to_purge(tt_global, &msg))
|
|
continue;
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Deleting global tt entry %pM (vid: %d): %s\n",
|
|
tt_global->common.addr,
|
|
BATADV_PRINT_VID(tt_global->common.vid),
|
|
msg);
|
|
|
|
hlist_del_rcu(&tt_common->hash_entry);
|
|
|
|
batadv_tt_global_entry_free_ref(tt_global);
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
}
|
|
|
|
static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_hashtable *hash;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
struct batadv_tt_common_entry *tt_common_entry;
|
|
struct batadv_tt_global_entry *tt_global;
|
|
struct hlist_node *node_tmp;
|
|
struct hlist_head *head;
|
|
u32 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_tmp,
|
|
head, hash_entry) {
|
|
hlist_del_rcu(&tt_common_entry->hash_entry);
|
|
tt_global = container_of(tt_common_entry,
|
|
struct batadv_tt_global_entry,
|
|
common);
|
|
batadv_tt_global_entry_free_ref(tt_global);
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
|
|
batadv_hash_destroy(hash);
|
|
|
|
bat_priv->tt.global_hash = NULL;
|
|
}
|
|
|
|
static bool
|
|
_batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
|
|
struct batadv_tt_global_entry *tt_global_entry)
|
|
{
|
|
bool ret = false;
|
|
|
|
if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
|
|
tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
|
|
ret = true;
|
|
|
|
/* check if the two clients are marked as isolated */
|
|
if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
|
|
tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
|
|
ret = true;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_transtable_search - get the mesh destination for a given client
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @src: mac address of the source client
|
|
* @addr: mac address of the destination client
|
|
* @vid: VLAN identifier
|
|
*
|
|
* Returns a pointer to the originator that was selected as destination in the
|
|
* mesh for contacting the client 'addr', NULL otherwise.
|
|
* In case of multiple originators serving the same client, the function returns
|
|
* the best one (best in terms of metric towards the destination node).
|
|
*
|
|
* If the two clients are AP isolated the function returns NULL.
|
|
*/
|
|
struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
|
|
const u8 *src,
|
|
const u8 *addr,
|
|
unsigned short vid)
|
|
{
|
|
struct batadv_tt_local_entry *tt_local_entry = NULL;
|
|
struct batadv_tt_global_entry *tt_global_entry = NULL;
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
struct batadv_tt_orig_list_entry *best_entry;
|
|
|
|
if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
|
|
tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
|
|
if (!tt_local_entry ||
|
|
(tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
|
|
goto out;
|
|
}
|
|
|
|
tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
/* check whether the clients should not communicate due to AP
|
|
* isolation
|
|
*/
|
|
if (tt_local_entry &&
|
|
_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
|
|
goto out;
|
|
|
|
rcu_read_lock();
|
|
best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
|
|
/* found anything? */
|
|
if (best_entry)
|
|
orig_node = best_entry->orig_node;
|
|
if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
|
|
orig_node = NULL;
|
|
rcu_read_unlock();
|
|
|
|
out:
|
|
if (tt_global_entry)
|
|
batadv_tt_global_entry_free_ref(tt_global_entry);
|
|
if (tt_local_entry)
|
|
batadv_tt_local_entry_free_ref(tt_local_entry);
|
|
|
|
return orig_node;
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_global_crc - calculates the checksum of the local table belonging
|
|
* to the given orig_node
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig_node: originator for which the CRC should be computed
|
|
* @vid: VLAN identifier for which the CRC32 has to be computed
|
|
*
|
|
* This function computes the checksum for the global table corresponding to a
|
|
* specific originator. In particular, the checksum is computed as follows: For
|
|
* each client connected to the originator the CRC32C of the MAC address and the
|
|
* VID is computed and then all the CRC32Cs of the various clients are xor'ed
|
|
* together.
|
|
*
|
|
* The idea behind is that CRC32C should be used as much as possible in order to
|
|
* produce a unique hash of the table, but since the order which is used to feed
|
|
* the CRC32C function affects the result and since every node in the network
|
|
* probably sorts the clients differently, the hash function cannot be directly
|
|
* computed over the entire table. Hence the CRC32C is used only on
|
|
* the single client entry, while all the results are then xor'ed together
|
|
* because the XOR operation can combine them all while trying to reduce the
|
|
* noise as much as possible.
|
|
*
|
|
* Returns the checksum of the global table of a given originator.
|
|
*/
|
|
static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
unsigned short vid)
|
|
{
|
|
struct batadv_hashtable *hash = bat_priv->tt.global_hash;
|
|
struct batadv_tt_common_entry *tt_common;
|
|
struct batadv_tt_global_entry *tt_global;
|
|
struct hlist_head *head;
|
|
u32 i, crc_tmp, crc = 0;
|
|
u8 flags;
|
|
__be16 tmp_vid;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
|
|
tt_global = container_of(tt_common,
|
|
struct batadv_tt_global_entry,
|
|
common);
|
|
/* compute the CRC only for entries belonging to the
|
|
* VLAN identified by the vid passed as parameter
|
|
*/
|
|
if (tt_common->vid != vid)
|
|
continue;
|
|
|
|
/* 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_common->flags & BATADV_TT_CLIENT_ROAM)
|
|
continue;
|
|
/* Temporary clients have not been announced yet, so
|
|
* they have to be skipped while computing the global
|
|
* crc
|
|
*/
|
|
if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
|
|
continue;
|
|
|
|
/* find out if this global entry is announced by this
|
|
* originator
|
|
*/
|
|
if (!batadv_tt_global_entry_has_orig(tt_global,
|
|
orig_node))
|
|
continue;
|
|
|
|
/* use network order to read the VID: this ensures that
|
|
* every node reads the bytes in the same order.
|
|
*/
|
|
tmp_vid = htons(tt_common->vid);
|
|
crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
|
|
|
|
/* compute the CRC on flags that have to be kept in sync
|
|
* among nodes
|
|
*/
|
|
flags = tt_common->flags & BATADV_TT_SYNC_MASK;
|
|
crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
|
|
|
|
crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return crc;
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_local_crc - calculates the checksum of the local table
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @vid: VLAN identifier for which the CRC32 has to be computed
|
|
*
|
|
* For details about the computation, please refer to the documentation for
|
|
* batadv_tt_global_crc().
|
|
*
|
|
* Returns the checksum of the local table
|
|
*/
|
|
static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
|
|
unsigned short vid)
|
|
{
|
|
struct batadv_hashtable *hash = bat_priv->tt.local_hash;
|
|
struct batadv_tt_common_entry *tt_common;
|
|
struct hlist_head *head;
|
|
u32 i, crc_tmp, crc = 0;
|
|
u8 flags;
|
|
__be16 tmp_vid;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
|
|
/* compute the CRC only for entries belonging to the
|
|
* VLAN identified by vid
|
|
*/
|
|
if (tt_common->vid != vid)
|
|
continue;
|
|
|
|
/* not yet committed clients have not to be taken into
|
|
* account while computing the CRC
|
|
*/
|
|
if (tt_common->flags & BATADV_TT_CLIENT_NEW)
|
|
continue;
|
|
|
|
/* use network order to read the VID: this ensures that
|
|
* every node reads the bytes in the same order.
|
|
*/
|
|
tmp_vid = htons(tt_common->vid);
|
|
crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
|
|
|
|
/* compute the CRC on flags that have to be kept in sync
|
|
* among nodes
|
|
*/
|
|
flags = tt_common->flags & BATADV_TT_SYNC_MASK;
|
|
crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
|
|
|
|
crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return crc;
|
|
}
|
|
|
|
static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_tt_req_node *node;
|
|
struct hlist_node *safe;
|
|
|
|
spin_lock_bh(&bat_priv->tt.req_list_lock);
|
|
|
|
hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
|
|
hlist_del_init(&node->list);
|
|
kfree(node);
|
|
}
|
|
|
|
spin_unlock_bh(&bat_priv->tt.req_list_lock);
|
|
}
|
|
|
|
static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
const void *tt_buff,
|
|
u16 tt_buff_len)
|
|
{
|
|
/* 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 batadv_tt_req_purge(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_tt_req_node *node;
|
|
struct hlist_node *safe;
|
|
|
|
spin_lock_bh(&bat_priv->tt.req_list_lock);
|
|
hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
|
|
if (batadv_has_timed_out(node->issued_at,
|
|
BATADV_TT_REQUEST_TIMEOUT)) {
|
|
hlist_del_init(&node->list);
|
|
kfree(node);
|
|
}
|
|
}
|
|
spin_unlock_bh(&bat_priv->tt.req_list_lock);
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_req_node_new - search and possibly create a tt_req_node object
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig_node: orig node this request is being issued for
|
|
*
|
|
* 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 batadv_tt_req_node *
|
|
batadv_tt_req_node_new(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node)
|
|
{
|
|
struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
|
|
|
|
spin_lock_bh(&bat_priv->tt.req_list_lock);
|
|
hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
|
|
if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
|
|
!batadv_has_timed_out(tt_req_node_tmp->issued_at,
|
|
BATADV_TT_REQUEST_TIMEOUT))
|
|
goto unlock;
|
|
}
|
|
|
|
tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
|
|
if (!tt_req_node)
|
|
goto unlock;
|
|
|
|
ether_addr_copy(tt_req_node->addr, orig_node->orig);
|
|
tt_req_node->issued_at = jiffies;
|
|
|
|
hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
|
|
unlock:
|
|
spin_unlock_bh(&bat_priv->tt.req_list_lock);
|
|
return tt_req_node;
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_local_valid - verify that given tt entry is a valid one
|
|
* @entry_ptr: to be checked local tt entry
|
|
* @data_ptr: not used but definition required to satisfy the callback prototype
|
|
*
|
|
* Returns 1 if the entry is a valid, 0 otherwise.
|
|
*/
|
|
static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
|
|
{
|
|
const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
|
|
|
|
if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int batadv_tt_global_valid(const void *entry_ptr,
|
|
const void *data_ptr)
|
|
{
|
|
const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
|
|
const struct batadv_tt_global_entry *tt_global_entry;
|
|
const struct batadv_orig_node *orig_node = data_ptr;
|
|
|
|
if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
|
|
tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
|
|
return 0;
|
|
|
|
tt_global_entry = container_of(tt_common_entry,
|
|
struct batadv_tt_global_entry,
|
|
common);
|
|
|
|
return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
|
|
* specified tt hash
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @hash: hash table containing the tt entries
|
|
* @tt_len: expected tvlv tt data buffer length in number of bytes
|
|
* @tvlv_buff: pointer to the buffer to fill with the TT data
|
|
* @valid_cb: function to filter tt change entries
|
|
* @cb_data: data passed to the filter function as argument
|
|
*/
|
|
static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
|
|
struct batadv_hashtable *hash,
|
|
void *tvlv_buff, u16 tt_len,
|
|
int (*valid_cb)(const void *, const void *),
|
|
void *cb_data)
|
|
{
|
|
struct batadv_tt_common_entry *tt_common_entry;
|
|
struct batadv_tvlv_tt_change *tt_change;
|
|
struct hlist_head *head;
|
|
u16 tt_tot, tt_num_entries = 0;
|
|
u32 i;
|
|
|
|
tt_tot = batadv_tt_entries(tt_len);
|
|
tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
|
|
|
|
rcu_read_lock();
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
hlist_for_each_entry_rcu(tt_common_entry,
|
|
head, hash_entry) {
|
|
if (tt_tot == tt_num_entries)
|
|
break;
|
|
|
|
if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
|
|
continue;
|
|
|
|
ether_addr_copy(tt_change->addr, tt_common_entry->addr);
|
|
tt_change->flags = tt_common_entry->flags;
|
|
tt_change->vid = htons(tt_common_entry->vid);
|
|
memset(tt_change->reserved, 0,
|
|
sizeof(tt_change->reserved));
|
|
|
|
tt_num_entries++;
|
|
tt_change++;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_global_check_crc - check if all the CRCs are correct
|
|
* @orig_node: originator for which the CRCs have to be checked
|
|
* @tt_vlan: pointer to the first tvlv VLAN entry
|
|
* @num_vlan: number of tvlv VLAN entries
|
|
* @create: if true, create VLAN objects if not found
|
|
*
|
|
* Return true if all the received CRCs match the locally stored ones, false
|
|
* otherwise
|
|
*/
|
|
static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
|
|
struct batadv_tvlv_tt_vlan_data *tt_vlan,
|
|
u16 num_vlan)
|
|
{
|
|
struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
|
|
struct batadv_orig_node_vlan *vlan;
|
|
u32 crc;
|
|
int i;
|
|
|
|
/* check if each received CRC matches the locally stored one */
|
|
for (i = 0; i < num_vlan; i++) {
|
|
tt_vlan_tmp = tt_vlan + i;
|
|
|
|
/* if orig_node is a backbone node for this VLAN, don't check
|
|
* the CRC as we ignore all the global entries over it
|
|
*/
|
|
if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
|
|
orig_node->orig,
|
|
ntohs(tt_vlan_tmp->vid)))
|
|
continue;
|
|
|
|
vlan = batadv_orig_node_vlan_get(orig_node,
|
|
ntohs(tt_vlan_tmp->vid));
|
|
if (!vlan)
|
|
return false;
|
|
|
|
crc = vlan->tt.crc;
|
|
batadv_orig_node_vlan_free_ref(vlan);
|
|
|
|
if (crc != ntohl(tt_vlan_tmp->crc))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_local_update_crc - update all the local CRCs
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
*/
|
|
static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_softif_vlan *vlan;
|
|
|
|
/* recompute the global CRC for each VLAN */
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
|
|
vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_global_update_crc - update all the global CRCs for this orig_node
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig_node: the orig_node for which the CRCs have to be updated
|
|
*/
|
|
static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node)
|
|
{
|
|
struct batadv_orig_node_vlan *vlan;
|
|
u32 crc;
|
|
|
|
/* recompute the global CRC for each VLAN */
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
|
|
/* if orig_node is a backbone node for this VLAN, don't compute
|
|
* the CRC as we ignore all the global entries over it
|
|
*/
|
|
if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
|
|
vlan->vid))
|
|
continue;
|
|
|
|
crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
|
|
vlan->tt.crc = crc;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* batadv_send_tt_request - send a TT Request message to a given node
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @dst_orig_node: the destination of the message
|
|
* @ttvn: the version number that the source of the message is looking for
|
|
* @tt_vlan: pointer to the first tvlv VLAN object to request
|
|
* @num_vlan: number of tvlv VLAN entries
|
|
* @full_table: ask for the entire translation table if true, while only for the
|
|
* last TT diff otherwise
|
|
*/
|
|
static int batadv_send_tt_request(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *dst_orig_node,
|
|
u8 ttvn,
|
|
struct batadv_tvlv_tt_vlan_data *tt_vlan,
|
|
u16 num_vlan, bool full_table)
|
|
{
|
|
struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
|
|
struct batadv_tt_req_node *tt_req_node = NULL;
|
|
struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
|
|
struct batadv_hard_iface *primary_if;
|
|
bool ret = false;
|
|
int i, size;
|
|
|
|
primary_if = batadv_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 = batadv_tt_req_node_new(bat_priv, dst_orig_node);
|
|
if (!tt_req_node)
|
|
goto out;
|
|
|
|
size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
|
|
tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
|
|
if (!tvlv_tt_data)
|
|
goto out;
|
|
|
|
tvlv_tt_data->flags = BATADV_TT_REQUEST;
|
|
tvlv_tt_data->ttvn = ttvn;
|
|
tvlv_tt_data->num_vlan = htons(num_vlan);
|
|
|
|
/* send all the CRCs within the request. This is needed by intermediate
|
|
* nodes to ensure they have the correct table before replying
|
|
*/
|
|
tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
|
|
for (i = 0; i < num_vlan; i++) {
|
|
tt_vlan_req->vid = tt_vlan->vid;
|
|
tt_vlan_req->crc = tt_vlan->crc;
|
|
|
|
tt_vlan_req++;
|
|
tt_vlan++;
|
|
}
|
|
|
|
if (full_table)
|
|
tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
|
|
dst_orig_node->orig, full_table ? 'F' : '.');
|
|
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
|
|
batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
|
|
dst_orig_node->orig, BATADV_TVLV_TT, 1,
|
|
tvlv_tt_data, size);
|
|
ret = true;
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
if (ret && tt_req_node) {
|
|
spin_lock_bh(&bat_priv->tt.req_list_lock);
|
|
/* hlist_del_init() verifies tt_req_node still is in the list */
|
|
hlist_del_init(&tt_req_node->list);
|
|
spin_unlock_bh(&bat_priv->tt.req_list_lock);
|
|
kfree(tt_req_node);
|
|
}
|
|
kfree(tvlv_tt_data);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_send_other_tt_response - send reply to tt request concerning another
|
|
* node's translation table
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @tt_data: tt data containing the tt request information
|
|
* @req_src: mac address of tt request sender
|
|
* @req_dst: mac address of tt request recipient
|
|
*
|
|
* Returns true if tt request reply was sent, false otherwise.
|
|
*/
|
|
static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
|
|
struct batadv_tvlv_tt_data *tt_data,
|
|
u8 *req_src, u8 *req_dst)
|
|
{
|
|
struct batadv_orig_node *req_dst_orig_node;
|
|
struct batadv_orig_node *res_dst_orig_node = NULL;
|
|
struct batadv_tvlv_tt_change *tt_change;
|
|
struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
|
|
struct batadv_tvlv_tt_vlan_data *tt_vlan;
|
|
bool ret = false, full_table;
|
|
u8 orig_ttvn, req_ttvn;
|
|
u16 tvlv_len;
|
|
s32 tt_len;
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
|
|
req_src, tt_data->ttvn, req_dst,
|
|
((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
|
|
|
|
/* Let's get the orig node of the REAL destination */
|
|
req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
|
|
if (!req_dst_orig_node)
|
|
goto out;
|
|
|
|
res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
|
|
if (!res_dst_orig_node)
|
|
goto out;
|
|
|
|
orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
|
|
req_ttvn = tt_data->ttvn;
|
|
|
|
tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
|
|
/* this node doesn't have the requested data */
|
|
if (orig_ttvn != req_ttvn ||
|
|
!batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
|
|
ntohs(tt_data->num_vlan)))
|
|
goto out;
|
|
|
|
/* If the full table has been explicitly requested */
|
|
if (tt_data->flags & BATADV_TT_FULL_TABLE ||
|
|
!req_dst_orig_node->tt_buff)
|
|
full_table = true;
|
|
else
|
|
full_table = false;
|
|
|
|
/* TT fragmentation hasn't been implemented yet, so send as many
|
|
* TT entries fit a single packet as possible only
|
|
*/
|
|
if (!full_table) {
|
|
spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
|
|
tt_len = req_dst_orig_node->tt_buff_len;
|
|
|
|
tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
|
|
&tvlv_tt_data,
|
|
&tt_change,
|
|
&tt_len);
|
|
if (!tt_len)
|
|
goto unlock;
|
|
|
|
/* Copy the last orig_node's OGM buffer */
|
|
memcpy(tt_change, req_dst_orig_node->tt_buff,
|
|
req_dst_orig_node->tt_buff_len);
|
|
spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
|
|
} else {
|
|
/* allocate the tvlv, put the tt_data and all the tt_vlan_data
|
|
* in the initial part
|
|
*/
|
|
tt_len = -1;
|
|
tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
|
|
&tvlv_tt_data,
|
|
&tt_change,
|
|
&tt_len);
|
|
if (!tt_len)
|
|
goto out;
|
|
|
|
/* fill the rest of the tvlv with the real TT entries */
|
|
batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
|
|
tt_change, tt_len,
|
|
batadv_tt_global_valid,
|
|
req_dst_orig_node);
|
|
}
|
|
|
|
/* Don't send the response, if larger than fragmented packet. */
|
|
tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
|
|
if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
|
|
net_ratelimited_function(batadv_info, bat_priv->soft_iface,
|
|
"Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
|
|
res_dst_orig_node->orig);
|
|
goto out;
|
|
}
|
|
|
|
tvlv_tt_data->flags = BATADV_TT_RESPONSE;
|
|
tvlv_tt_data->ttvn = req_ttvn;
|
|
|
|
if (full_table)
|
|
tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
|
|
res_dst_orig_node->orig, req_dst_orig_node->orig,
|
|
full_table ? 'F' : '.', req_ttvn);
|
|
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
|
|
|
|
batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
|
|
req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
|
|
tvlv_len);
|
|
|
|
ret = true;
|
|
goto out;
|
|
|
|
unlock:
|
|
spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
|
|
|
|
out:
|
|
if (res_dst_orig_node)
|
|
batadv_orig_node_free_ref(res_dst_orig_node);
|
|
if (req_dst_orig_node)
|
|
batadv_orig_node_free_ref(req_dst_orig_node);
|
|
kfree(tvlv_tt_data);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_send_my_tt_response - send reply to tt request concerning this node's
|
|
* translation table
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @tt_data: tt data containing the tt request information
|
|
* @req_src: mac address of tt request sender
|
|
*
|
|
* Returns true if tt request reply was sent, false otherwise.
|
|
*/
|
|
static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
|
|
struct batadv_tvlv_tt_data *tt_data,
|
|
u8 *req_src)
|
|
{
|
|
struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
struct batadv_tvlv_tt_change *tt_change;
|
|
struct batadv_orig_node *orig_node;
|
|
u8 my_ttvn, req_ttvn;
|
|
u16 tvlv_len;
|
|
bool full_table;
|
|
s32 tt_len;
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
|
|
req_src, tt_data->ttvn,
|
|
((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
|
|
|
|
spin_lock_bh(&bat_priv->tt.commit_lock);
|
|
|
|
my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
|
|
req_ttvn = tt_data->ttvn;
|
|
|
|
orig_node = batadv_orig_hash_find(bat_priv, req_src);
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
primary_if = batadv_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_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
|
|
!bat_priv->tt.last_changeset)
|
|
full_table = true;
|
|
else
|
|
full_table = false;
|
|
|
|
/* TT fragmentation hasn't been implemented yet, so send as many
|
|
* TT entries fit a single packet as possible only
|
|
*/
|
|
if (!full_table) {
|
|
spin_lock_bh(&bat_priv->tt.last_changeset_lock);
|
|
|
|
tt_len = bat_priv->tt.last_changeset_len;
|
|
tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
|
|
&tvlv_tt_data,
|
|
&tt_change,
|
|
&tt_len);
|
|
if (!tt_len)
|
|
goto unlock;
|
|
|
|
/* Copy the last orig_node's OGM buffer */
|
|
memcpy(tt_change, bat_priv->tt.last_changeset,
|
|
bat_priv->tt.last_changeset_len);
|
|
spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
|
|
} else {
|
|
req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
|
|
|
|
/* allocate the tvlv, put the tt_data and all the tt_vlan_data
|
|
* in the initial part
|
|
*/
|
|
tt_len = -1;
|
|
tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
|
|
&tvlv_tt_data,
|
|
&tt_change,
|
|
&tt_len);
|
|
if (!tt_len)
|
|
goto out;
|
|
|
|
/* fill the rest of the tvlv with the real TT entries */
|
|
batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
|
|
tt_change, tt_len,
|
|
batadv_tt_local_valid, NULL);
|
|
}
|
|
|
|
tvlv_tt_data->flags = BATADV_TT_RESPONSE;
|
|
tvlv_tt_data->ttvn = req_ttvn;
|
|
|
|
if (full_table)
|
|
tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
|
|
orig_node->orig, full_table ? 'F' : '.', req_ttvn);
|
|
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
|
|
|
|
batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
|
|
req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
|
|
tvlv_len);
|
|
|
|
goto out;
|
|
|
|
unlock:
|
|
spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
|
|
out:
|
|
spin_unlock_bh(&bat_priv->tt.commit_lock);
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(orig_node);
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
kfree(tvlv_tt_data);
|
|
/* The packet was for this host, so it doesn't need to be re-routed */
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* batadv_send_tt_response - send reply to tt request
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @tt_data: tt data containing the tt request information
|
|
* @req_src: mac address of tt request sender
|
|
* @req_dst: mac address of tt request recipient
|
|
*
|
|
* Returns true if tt request reply was sent, false otherwise.
|
|
*/
|
|
static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
|
|
struct batadv_tvlv_tt_data *tt_data,
|
|
u8 *req_src, u8 *req_dst)
|
|
{
|
|
if (batadv_is_my_mac(bat_priv, req_dst))
|
|
return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
|
|
return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
|
|
req_dst);
|
|
}
|
|
|
|
static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
struct batadv_tvlv_tt_change *tt_change,
|
|
u16 tt_num_changes, u8 ttvn)
|
|
{
|
|
int i;
|
|
int roams;
|
|
|
|
for (i = 0; i < tt_num_changes; i++) {
|
|
if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
|
|
roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
|
|
batadv_tt_global_del(bat_priv, orig_node,
|
|
(tt_change + i)->addr,
|
|
ntohs((tt_change + i)->vid),
|
|
"tt removed by changes",
|
|
roams);
|
|
} else {
|
|
if (!batadv_tt_global_add(bat_priv, orig_node,
|
|
(tt_change + i)->addr,
|
|
ntohs((tt_change + i)->vid),
|
|
(tt_change + i)->flags, ttvn))
|
|
/* 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;
|
|
}
|
|
}
|
|
set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
|
|
}
|
|
|
|
static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
|
|
struct batadv_tvlv_tt_change *tt_change,
|
|
u8 ttvn, u8 *resp_src,
|
|
u16 num_entries)
|
|
{
|
|
struct batadv_orig_node *orig_node;
|
|
|
|
orig_node = batadv_orig_hash_find(bat_priv, resp_src);
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
/* Purge the old table first.. */
|
|
batadv_tt_global_del_orig(bat_priv, orig_node, -1,
|
|
"Received full table");
|
|
|
|
_batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
|
|
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, ttvn);
|
|
|
|
out:
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(orig_node);
|
|
}
|
|
|
|
static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
u16 tt_num_changes, u8 ttvn,
|
|
struct batadv_tvlv_tt_change *tt_change)
|
|
{
|
|
_batadv_tt_update_changes(bat_priv, orig_node, tt_change,
|
|
tt_num_changes, ttvn);
|
|
|
|
batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
|
|
batadv_tt_len(tt_num_changes));
|
|
atomic_set(&orig_node->last_ttvn, ttvn);
|
|
}
|
|
|
|
/**
|
|
* batadv_is_my_client - check if a client is served by the local node
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @addr: the mac address of the client to check
|
|
* @vid: VLAN identifier
|
|
*
|
|
* Returns true if the client is served by this node, false otherwise.
|
|
*/
|
|
bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
|
|
unsigned short vid)
|
|
{
|
|
struct batadv_tt_local_entry *tt_local_entry;
|
|
bool ret = false;
|
|
|
|
tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
|
|
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 & BATADV_TT_CLIENT_PENDING) ||
|
|
(tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
|
|
goto out;
|
|
ret = true;
|
|
out:
|
|
if (tt_local_entry)
|
|
batadv_tt_local_entry_free_ref(tt_local_entry);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_handle_tt_response - process incoming tt reply
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @tt_data: tt data containing the tt request information
|
|
* @resp_src: mac address of tt reply sender
|
|
* @num_entries: number of tt change entries appended to the tt data
|
|
*/
|
|
static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
|
|
struct batadv_tvlv_tt_data *tt_data,
|
|
u8 *resp_src, u16 num_entries)
|
|
{
|
|
struct batadv_tt_req_node *node;
|
|
struct hlist_node *safe;
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
struct batadv_tvlv_tt_change *tt_change;
|
|
u8 *tvlv_ptr = (u8 *)tt_data;
|
|
u16 change_offset;
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
|
|
resp_src, tt_data->ttvn, num_entries,
|
|
((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
|
|
|
|
orig_node = batadv_orig_hash_find(bat_priv, resp_src);
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
spin_lock_bh(&orig_node->tt_lock);
|
|
|
|
change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
|
|
change_offset *= ntohs(tt_data->num_vlan);
|
|
change_offset += sizeof(*tt_data);
|
|
tvlv_ptr += change_offset;
|
|
|
|
tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
|
|
if (tt_data->flags & BATADV_TT_FULL_TABLE) {
|
|
batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
|
|
resp_src, num_entries);
|
|
} else {
|
|
batadv_tt_update_changes(bat_priv, orig_node, num_entries,
|
|
tt_data->ttvn, tt_change);
|
|
}
|
|
|
|
/* Recalculate the CRC for this orig_node and store it */
|
|
batadv_tt_global_update_crc(bat_priv, orig_node);
|
|
|
|
spin_unlock_bh(&orig_node->tt_lock);
|
|
|
|
/* Delete the tt_req_node from pending tt_requests list */
|
|
spin_lock_bh(&bat_priv->tt.req_list_lock);
|
|
hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
|
|
if (!batadv_compare_eth(node->addr, resp_src))
|
|
continue;
|
|
hlist_del_init(&node->list);
|
|
kfree(node);
|
|
}
|
|
|
|
spin_unlock_bh(&bat_priv->tt.req_list_lock);
|
|
out:
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(orig_node);
|
|
}
|
|
|
|
static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_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 batadv_tt_roam_purge(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_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 (!batadv_has_timed_out(node->first_time,
|
|
BATADV_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 batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
|
|
{
|
|
struct batadv_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 (!batadv_compare_eth(tt_roam_node->addr, client))
|
|
continue;
|
|
|
|
if (batadv_has_timed_out(tt_roam_node->first_time,
|
|
BATADV_ROAMING_MAX_TIME))
|
|
continue;
|
|
|
|
if (!batadv_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,
|
|
BATADV_ROAMING_MAX_COUNT - 1);
|
|
ether_addr_copy(tt_roam_node->addr, client);
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* batadv_send_roam_adv - send a roaming advertisement message
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @client: mac address of the roaming client
|
|
* @vid: VLAN identifier
|
|
* @orig_node: message destination
|
|
*
|
|
* Send a ROAMING_ADV message to the node which was previously serving this
|
|
* client. This is done to inform the node that from now on all traffic destined
|
|
* for this particular roamed client has to be forwarded to the sender of the
|
|
* roaming message.
|
|
*/
|
|
static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
|
|
unsigned short vid,
|
|
struct batadv_orig_node *orig_node)
|
|
{
|
|
struct batadv_hard_iface *primary_if;
|
|
struct batadv_tvlv_roam_adv tvlv_roam;
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
/* before going on we have to check whether the client has
|
|
* already roamed to us too many times
|
|
*/
|
|
if (!batadv_tt_check_roam_count(bat_priv, client))
|
|
goto out;
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
|
|
orig_node->orig, client, BATADV_PRINT_VID(vid));
|
|
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
|
|
|
|
memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
|
|
tvlv_roam.vid = htons(vid);
|
|
|
|
batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
|
|
orig_node->orig, BATADV_TVLV_ROAM, 1,
|
|
&tvlv_roam, sizeof(tvlv_roam));
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
}
|
|
|
|
static void batadv_tt_purge(struct work_struct *work)
|
|
{
|
|
struct delayed_work *delayed_work;
|
|
struct batadv_priv_tt *priv_tt;
|
|
struct batadv_priv *bat_priv;
|
|
|
|
delayed_work = container_of(work, struct delayed_work, work);
|
|
priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
|
|
bat_priv = container_of(priv_tt, struct batadv_priv, tt);
|
|
|
|
batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
|
|
batadv_tt_global_purge(bat_priv);
|
|
batadv_tt_req_purge(bat_priv);
|
|
batadv_tt_roam_purge(bat_priv);
|
|
|
|
queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
|
|
msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
|
|
}
|
|
|
|
void batadv_tt_free(struct batadv_priv *bat_priv)
|
|
{
|
|
batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
|
|
batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
|
|
|
|
cancel_delayed_work_sync(&bat_priv->tt.work);
|
|
|
|
batadv_tt_local_table_free(bat_priv);
|
|
batadv_tt_global_table_free(bat_priv);
|
|
batadv_tt_req_list_free(bat_priv);
|
|
batadv_tt_changes_list_free(bat_priv);
|
|
batadv_tt_roam_list_free(bat_priv);
|
|
|
|
kfree(bat_priv->tt.last_changeset);
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_local_set_flags - set or unset the specified flags on the local
|
|
* table and possibly count them in the TT size
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @flags: the flag to switch
|
|
* @enable: whether to set or unset the flag
|
|
* @count: whether to increase the TT size by the number of changed entries
|
|
*/
|
|
static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
|
|
bool enable, bool count)
|
|
{
|
|
struct batadv_hashtable *hash = bat_priv->tt.local_hash;
|
|
struct batadv_tt_common_entry *tt_common_entry;
|
|
u16 changed_num = 0;
|
|
struct hlist_head *head;
|
|
u32 i;
|
|
|
|
if (!hash)
|
|
return;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tt_common_entry,
|
|
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++;
|
|
|
|
if (!count)
|
|
continue;
|
|
|
|
batadv_tt_local_size_inc(bat_priv,
|
|
tt_common_entry->vid);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
|
|
/* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
|
|
static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
|
|
{
|
|
struct batadv_hashtable *hash = bat_priv->tt.local_hash;
|
|
struct batadv_tt_common_entry *tt_common;
|
|
struct batadv_tt_local_entry *tt_local;
|
|
struct batadv_softif_vlan *vlan;
|
|
struct hlist_node *node_tmp;
|
|
struct hlist_head *head;
|
|
spinlock_t *list_lock; /* protects write access to the hash lists */
|
|
u32 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, node_tmp, head,
|
|
hash_entry) {
|
|
if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
|
|
continue;
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Deleting local tt entry (%pM, vid: %d): pending\n",
|
|
tt_common->addr,
|
|
BATADV_PRINT_VID(tt_common->vid));
|
|
|
|
batadv_tt_local_size_dec(bat_priv, tt_common->vid);
|
|
hlist_del_rcu(&tt_common->hash_entry);
|
|
tt_local = container_of(tt_common,
|
|
struct batadv_tt_local_entry,
|
|
common);
|
|
|
|
/* decrease the reference held for this vlan */
|
|
vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid);
|
|
if (vlan) {
|
|
batadv_softif_vlan_free_ref(vlan);
|
|
batadv_softif_vlan_free_ref(vlan);
|
|
}
|
|
|
|
batadv_tt_local_entry_free_ref(tt_local);
|
|
}
|
|
spin_unlock_bh(list_lock);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
|
|
* which have been queued in the time since the last commit
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
*
|
|
* Caller must hold tt->commit_lock.
|
|
*/
|
|
static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
|
|
{
|
|
lockdep_assert_held(&bat_priv->tt.commit_lock);
|
|
|
|
/* Update multicast addresses in local translation table */
|
|
batadv_mcast_mla_update(bat_priv);
|
|
|
|
if (atomic_read(&bat_priv->tt.local_changes) < 1) {
|
|
if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
|
|
batadv_tt_tvlv_container_update(bat_priv);
|
|
return;
|
|
}
|
|
|
|
batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
|
|
|
|
batadv_tt_local_purge_pending_clients(bat_priv);
|
|
batadv_tt_local_update_crc(bat_priv);
|
|
|
|
/* Increment the TTVN only once per OGM interval */
|
|
atomic_inc(&bat_priv->tt.vn);
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Local changes committed, updating to ttvn %u\n",
|
|
(u8)atomic_read(&bat_priv->tt.vn));
|
|
|
|
/* reset the sending counter */
|
|
atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
|
|
batadv_tt_tvlv_container_update(bat_priv);
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_local_commit_changes - commit all pending local tt changes which
|
|
* have been queued in the time since the last commit
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
*/
|
|
void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
|
|
{
|
|
spin_lock_bh(&bat_priv->tt.commit_lock);
|
|
batadv_tt_local_commit_changes_nolock(bat_priv);
|
|
spin_unlock_bh(&bat_priv->tt.commit_lock);
|
|
}
|
|
|
|
bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
|
|
unsigned short vid)
|
|
{
|
|
struct batadv_tt_local_entry *tt_local_entry = NULL;
|
|
struct batadv_tt_global_entry *tt_global_entry = NULL;
|
|
struct batadv_softif_vlan *vlan;
|
|
bool ret = false;
|
|
|
|
vlan = batadv_softif_vlan_get(bat_priv, vid);
|
|
if (!vlan || !atomic_read(&vlan->ap_isolation))
|
|
goto out;
|
|
|
|
tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
|
|
if (!tt_local_entry)
|
|
goto out;
|
|
|
|
tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
|
|
goto out;
|
|
|
|
ret = true;
|
|
|
|
out:
|
|
if (vlan)
|
|
batadv_softif_vlan_free_ref(vlan);
|
|
if (tt_global_entry)
|
|
batadv_tt_global_entry_free_ref(tt_global_entry);
|
|
if (tt_local_entry)
|
|
batadv_tt_local_entry_free_ref(tt_local_entry);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_update_orig - update global translation table with new tt
|
|
* information received via ogms
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig: the orig_node of the ogm
|
|
* @tt_vlan: pointer to the first tvlv VLAN entry
|
|
* @tt_num_vlan: number of tvlv VLAN entries
|
|
* @tt_change: pointer to the first entry in the TT buffer
|
|
* @tt_num_changes: number of tt changes inside the tt buffer
|
|
* @ttvn: translation table version number of this changeset
|
|
* @tt_crc: crc32 checksum of orig node's translation table
|
|
*/
|
|
static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
const void *tt_buff, u16 tt_num_vlan,
|
|
struct batadv_tvlv_tt_change *tt_change,
|
|
u16 tt_num_changes, u8 ttvn)
|
|
{
|
|
u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
|
|
struct batadv_tvlv_tt_vlan_data *tt_vlan;
|
|
bool full_table = true;
|
|
bool has_tt_init;
|
|
|
|
tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
|
|
has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
|
|
&orig_node->capa_initialized);
|
|
|
|
/* orig table not initialised AND first diff is in the OGM OR the ttvn
|
|
* increased by one -> we can apply the attached changes
|
|
*/
|
|
if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
|
|
/* the OGM could not contain the changes due to their size or
|
|
* because they have already been sent BATADV_TT_OGM_APPEND_MAX
|
|
* times.
|
|
* In this case send a tt request
|
|
*/
|
|
if (!tt_num_changes) {
|
|
full_table = false;
|
|
goto request_table;
|
|
}
|
|
|
|
spin_lock_bh(&orig_node->tt_lock);
|
|
|
|
batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
|
|
ttvn, tt_change);
|
|
|
|
/* Even if we received the precomputed crc with the OGM, we
|
|
* prefer to recompute it to spot any possible inconsistency
|
|
* in the global table
|
|
*/
|
|
batadv_tt_global_update_crc(bat_priv, orig_node);
|
|
|
|
spin_unlock_bh(&orig_node->tt_lock);
|
|
|
|
/* 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 (!batadv_tt_global_check_crc(orig_node, tt_vlan,
|
|
tt_num_vlan))
|
|
goto request_table;
|
|
} else {
|
|
/* if we missed more than one change or our tables are not
|
|
* in sync anymore -> request fresh tt data
|
|
*/
|
|
if (!has_tt_init || ttvn != orig_ttvn ||
|
|
!batadv_tt_global_check_crc(orig_node, tt_vlan,
|
|
tt_num_vlan)) {
|
|
request_table:
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
|
|
orig_node->orig, ttvn, orig_ttvn,
|
|
tt_num_changes);
|
|
batadv_send_tt_request(bat_priv, orig_node, ttvn,
|
|
tt_vlan, tt_num_vlan,
|
|
full_table);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_global_client_is_roaming - check if a client is marked as roaming
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @addr: the mac address of the client to check
|
|
* @vid: VLAN identifier
|
|
*
|
|
* Returns true if we know that the client has moved from its old originator
|
|
* to another one. This entry is still kept for consistency purposes and will be
|
|
* deleted later by a DEL or because of timeout
|
|
*/
|
|
bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
|
|
u8 *addr, unsigned short vid)
|
|
{
|
|
struct batadv_tt_global_entry *tt_global_entry;
|
|
bool ret = false;
|
|
|
|
tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
|
|
if (!tt_global_entry)
|
|
goto out;
|
|
|
|
ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
|
|
batadv_tt_global_entry_free_ref(tt_global_entry);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_local_client_is_roaming - tells whether the client is roaming
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @addr: the mac address of the local client to query
|
|
* @vid: VLAN identifier
|
|
*
|
|
* Returns true if the local client is known to be roaming (it is not served by
|
|
* this node anymore) or not. If yes, the client is still present in the table
|
|
* to keep the latter consistent with the node TTVN
|
|
*/
|
|
bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
|
|
u8 *addr, unsigned short vid)
|
|
{
|
|
struct batadv_tt_local_entry *tt_local_entry;
|
|
bool ret = false;
|
|
|
|
tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
|
|
if (!tt_local_entry)
|
|
goto out;
|
|
|
|
ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
|
|
batadv_tt_local_entry_free_ref(tt_local_entry);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
const unsigned char *addr,
|
|
unsigned short vid)
|
|
{
|
|
bool ret = false;
|
|
|
|
if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
|
|
BATADV_TT_CLIENT_TEMP,
|
|
atomic_read(&orig_node->last_ttvn)))
|
|
goto out;
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
|
|
addr, BATADV_PRINT_VID(vid), orig_node->orig);
|
|
ret = true;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_local_resize_to_mtu - resize the local translation table fit the
|
|
* maximum packet size that can be transported through the mesh
|
|
* @soft_iface: netdev struct of the mesh interface
|
|
*
|
|
* Remove entries older than 'timeout' and half timeout if more entries need
|
|
* to be removed.
|
|
*/
|
|
void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
|
|
int packet_size_max = atomic_read(&bat_priv->packet_size_max);
|
|
int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
|
|
bool reduced = false;
|
|
|
|
spin_lock_bh(&bat_priv->tt.commit_lock);
|
|
|
|
while (true) {
|
|
table_size = batadv_tt_local_table_transmit_size(bat_priv);
|
|
if (packet_size_max >= table_size)
|
|
break;
|
|
|
|
batadv_tt_local_purge(bat_priv, timeout);
|
|
batadv_tt_local_purge_pending_clients(bat_priv);
|
|
|
|
timeout /= 2;
|
|
reduced = true;
|
|
net_ratelimited_function(batadv_info, soft_iface,
|
|
"Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
|
|
packet_size_max);
|
|
}
|
|
|
|
/* commit these changes immediately, to avoid synchronization problem
|
|
* with the TTVN
|
|
*/
|
|
if (reduced)
|
|
batadv_tt_local_commit_changes_nolock(bat_priv);
|
|
|
|
spin_unlock_bh(&bat_priv->tt.commit_lock);
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig: the orig_node of the ogm
|
|
* @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
|
|
* @tvlv_value: tvlv buffer containing the gateway data
|
|
* @tvlv_value_len: tvlv buffer length
|
|
*/
|
|
static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig,
|
|
u8 flags, void *tvlv_value,
|
|
u16 tvlv_value_len)
|
|
{
|
|
struct batadv_tvlv_tt_vlan_data *tt_vlan;
|
|
struct batadv_tvlv_tt_change *tt_change;
|
|
struct batadv_tvlv_tt_data *tt_data;
|
|
u16 num_entries, num_vlan;
|
|
|
|
if (tvlv_value_len < sizeof(*tt_data))
|
|
return;
|
|
|
|
tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
|
|
tvlv_value_len -= sizeof(*tt_data);
|
|
|
|
num_vlan = ntohs(tt_data->num_vlan);
|
|
|
|
if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
|
|
return;
|
|
|
|
tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
|
|
tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
|
|
tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
|
|
|
|
num_entries = batadv_tt_entries(tvlv_value_len);
|
|
|
|
batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
|
|
num_entries, tt_data->ttvn);
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
|
|
* container
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @src: mac address of tt tvlv sender
|
|
* @dst: mac address of tt tvlv recipient
|
|
* @tvlv_value: tvlv buffer containing the tt data
|
|
* @tvlv_value_len: tvlv buffer length
|
|
*
|
|
* Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
|
|
* otherwise.
|
|
*/
|
|
static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
|
|
u8 *src, u8 *dst,
|
|
void *tvlv_value,
|
|
u16 tvlv_value_len)
|
|
{
|
|
struct batadv_tvlv_tt_data *tt_data;
|
|
u16 tt_vlan_len, tt_num_entries;
|
|
char tt_flag;
|
|
bool ret;
|
|
|
|
if (tvlv_value_len < sizeof(*tt_data))
|
|
return NET_RX_SUCCESS;
|
|
|
|
tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
|
|
tvlv_value_len -= sizeof(*tt_data);
|
|
|
|
tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
|
|
tt_vlan_len *= ntohs(tt_data->num_vlan);
|
|
|
|
if (tvlv_value_len < tt_vlan_len)
|
|
return NET_RX_SUCCESS;
|
|
|
|
tvlv_value_len -= tt_vlan_len;
|
|
tt_num_entries = batadv_tt_entries(tvlv_value_len);
|
|
|
|
switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
|
|
case BATADV_TT_REQUEST:
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
|
|
|
|
/* If this node cannot provide a TT response the tt_request is
|
|
* forwarded
|
|
*/
|
|
ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
|
|
if (!ret) {
|
|
if (tt_data->flags & BATADV_TT_FULL_TABLE)
|
|
tt_flag = 'F';
|
|
else
|
|
tt_flag = '.';
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Routing TT_REQUEST to %pM [%c]\n",
|
|
dst, tt_flag);
|
|
/* tvlv API will re-route the packet */
|
|
return NET_RX_DROP;
|
|
}
|
|
break;
|
|
case BATADV_TT_RESPONSE:
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
|
|
|
|
if (batadv_is_my_mac(bat_priv, dst)) {
|
|
batadv_handle_tt_response(bat_priv, tt_data,
|
|
src, tt_num_entries);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
if (tt_data->flags & BATADV_TT_FULL_TABLE)
|
|
tt_flag = 'F';
|
|
else
|
|
tt_flag = '.';
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
|
|
|
|
/* tvlv API will re-route the packet */
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @src: mac address of tt tvlv sender
|
|
* @dst: mac address of tt tvlv recipient
|
|
* @tvlv_value: tvlv buffer containing the tt data
|
|
* @tvlv_value_len: tvlv buffer length
|
|
*
|
|
* Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
|
|
* otherwise.
|
|
*/
|
|
static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
|
|
u8 *src, u8 *dst,
|
|
void *tvlv_value,
|
|
u16 tvlv_value_len)
|
|
{
|
|
struct batadv_tvlv_roam_adv *roaming_adv;
|
|
struct batadv_orig_node *orig_node = NULL;
|
|
|
|
/* If this node is not the intended recipient of the
|
|
* roaming advertisement the packet is forwarded
|
|
* (the tvlv API will re-route the packet).
|
|
*/
|
|
if (!batadv_is_my_mac(bat_priv, dst))
|
|
return NET_RX_DROP;
|
|
|
|
if (tvlv_value_len < sizeof(*roaming_adv))
|
|
goto out;
|
|
|
|
orig_node = batadv_orig_hash_find(bat_priv, src);
|
|
if (!orig_node)
|
|
goto out;
|
|
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
|
|
roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
|
|
|
|
batadv_dbg(BATADV_DBG_TT, bat_priv,
|
|
"Received ROAMING_ADV from %pM (client %pM)\n",
|
|
src, roaming_adv->client);
|
|
|
|
batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
|
|
ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
|
|
atomic_read(&orig_node->last_ttvn) + 1);
|
|
|
|
out:
|
|
if (orig_node)
|
|
batadv_orig_node_free_ref(orig_node);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* batadv_tt_init - initialise the translation table internals
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
*
|
|
* Return 0 on success or negative error number in case of failure.
|
|
*/
|
|
int batadv_tt_init(struct batadv_priv *bat_priv)
|
|
{
|
|
int ret;
|
|
|
|
/* synchronized flags must be remote */
|
|
BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
|
|
|
|
ret = batadv_tt_local_init(bat_priv);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = batadv_tt_global_init(bat_priv);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
|
|
batadv_tt_tvlv_unicast_handler_v1,
|
|
BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
|
|
|
|
batadv_tvlv_handler_register(bat_priv, NULL,
|
|
batadv_roam_tvlv_unicast_handler_v1,
|
|
BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
|
|
|
|
INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
|
|
queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
|
|
msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
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* batadv_tt_global_is_isolated - check if a client is marked as isolated
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* @bat_priv: the bat priv with all the soft interface information
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* @addr: the mac address of the client
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* @vid: the identifier of the VLAN where this client is connected
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*
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* Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
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* otherwise
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*/
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bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
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const u8 *addr, unsigned short vid)
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{
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struct batadv_tt_global_entry *tt;
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bool ret;
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tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
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if (!tt)
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return false;
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ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
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batadv_tt_global_entry_free_ref(tt);
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return ret;
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}
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