linux/net/batman-adv/translation-table.c

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/*
* Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*
*/
#include "main.h"
#include "translation-table.h"
#include "soft-interface.h"
#include "hard-interface.h"
#include "hash.h"
#include "originator.h"
static void tt_local_purge(struct work_struct *work);
static void _tt_global_del_orig(struct bat_priv *bat_priv,
struct tt_global_entry *tt_global_entry,
const char *message);
/* returns 1 if they are the same mac addr */
static int compare_ltt(const struct hlist_node *node, const void *data2)
{
const void *data1 = container_of(node, struct tt_local_entry,
hash_entry);
return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
}
/* returns 1 if they are the same mac addr */
static int compare_gtt(const struct hlist_node *node, const void *data2)
{
const void *data1 = container_of(node, struct tt_global_entry,
hash_entry);
return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
}
static void tt_local_start_timer(struct bat_priv *bat_priv)
{
INIT_DELAYED_WORK(&bat_priv->tt_work, tt_local_purge);
queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work, 10 * HZ);
}
static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
const void *data)
{
struct hashtable_t *hash = bat_priv->tt_local_hash;
struct hlist_head *head;
struct hlist_node *node;
struct tt_local_entry *tt_local_entry, *tt_local_entry_tmp = NULL;
int index;
if (!hash)
return NULL;
index = choose_orig(data, hash->size);
head = &hash->table[index];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_local_entry, node, head, hash_entry) {
if (!compare_eth(tt_local_entry, data))
continue;
tt_local_entry_tmp = tt_local_entry;
break;
}
rcu_read_unlock();
return tt_local_entry_tmp;
}
static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
const void *data)
{
struct hashtable_t *hash = bat_priv->tt_global_hash;
struct hlist_head *head;
struct hlist_node *node;
struct tt_global_entry *tt_global_entry;
struct tt_global_entry *tt_global_entry_tmp = NULL;
int index;
if (!hash)
return NULL;
index = choose_orig(data, hash->size);
head = &hash->table[index];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_global_entry, node, head, hash_entry) {
if (!compare_eth(tt_global_entry, data))
continue;
tt_global_entry_tmp = tt_global_entry;
break;
}
rcu_read_unlock();
return tt_global_entry_tmp;
}
int tt_local_init(struct bat_priv *bat_priv)
{
if (bat_priv->tt_local_hash)
return 1;
bat_priv->tt_local_hash = hash_new(1024);
if (!bat_priv->tt_local_hash)
return 0;
atomic_set(&bat_priv->tt_local_changed, 0);
tt_local_start_timer(bat_priv);
return 1;
}
void tt_local_add(struct net_device *soft_iface, const uint8_t *addr)
{
struct bat_priv *bat_priv = netdev_priv(soft_iface);
struct tt_local_entry *tt_local_entry;
struct tt_global_entry *tt_global_entry;
int required_bytes;
spin_lock_bh(&bat_priv->tt_lhash_lock);
tt_local_entry = tt_local_hash_find(bat_priv, addr);
spin_unlock_bh(&bat_priv->tt_lhash_lock);
if (tt_local_entry) {
tt_local_entry->last_seen = jiffies;
return;
}
/* only announce as many hosts as possible in the batman-packet and
space in batman_packet->num_tt That also should give a limit to
MAC-flooding. */
required_bytes = (bat_priv->num_local_tt + 1) * ETH_ALEN;
required_bytes += BAT_PACKET_LEN;
if ((required_bytes > ETH_DATA_LEN) ||
(atomic_read(&bat_priv->aggregated_ogms) &&
required_bytes > MAX_AGGREGATION_BYTES) ||
(bat_priv->num_local_tt + 1 > 255)) {
bat_dbg(DBG_ROUTES, bat_priv,
"Can't add new local tt entry (%pM): "
"number of local tt entries exceeds packet size\n",
addr);
return;
}
bat_dbg(DBG_ROUTES, bat_priv,
"Creating new local tt entry: %pM\n", addr);
tt_local_entry = kmalloc(sizeof(struct tt_local_entry), GFP_ATOMIC);
if (!tt_local_entry)
return;
memcpy(tt_local_entry->addr, addr, ETH_ALEN);
tt_local_entry->last_seen = jiffies;
/* the batman interface mac address should never be purged */
if (compare_eth(addr, soft_iface->dev_addr))
tt_local_entry->never_purge = 1;
else
tt_local_entry->never_purge = 0;
spin_lock_bh(&bat_priv->tt_lhash_lock);
hash_add(bat_priv->tt_local_hash, compare_ltt, choose_orig,
tt_local_entry, &tt_local_entry->hash_entry);
bat_priv->num_local_tt++;
atomic_set(&bat_priv->tt_local_changed, 1);
spin_unlock_bh(&bat_priv->tt_lhash_lock);
/* remove address from global hash if present */
spin_lock_bh(&bat_priv->tt_ghash_lock);
tt_global_entry = tt_global_hash_find(bat_priv, addr);
if (tt_global_entry)
_tt_global_del_orig(bat_priv, tt_global_entry,
"local tt received");
spin_unlock_bh(&bat_priv->tt_ghash_lock);
}
int tt_local_fill_buffer(struct bat_priv *bat_priv,
unsigned char *buff, int buff_len)
{
struct hashtable_t *hash = bat_priv->tt_local_hash;
struct tt_local_entry *tt_local_entry;
struct hlist_node *node;
struct hlist_head *head;
int i, count = 0;
spin_lock_bh(&bat_priv->tt_lhash_lock);
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_local_entry, node,
head, hash_entry) {
if (buff_len < (count + 1) * ETH_ALEN)
break;
memcpy(buff + (count * ETH_ALEN), tt_local_entry->addr,
ETH_ALEN);
count++;
}
rcu_read_unlock();
}
/* if we did not get all new local tts see you next time ;-) */
if (count == bat_priv->num_local_tt)
atomic_set(&bat_priv->tt_local_changed, 0);
spin_unlock_bh(&bat_priv->tt_lhash_lock);
return count;
}
int tt_local_seq_print_text(struct seq_file *seq, void *offset)
{
struct net_device *net_dev = (struct net_device *)seq->private;
struct bat_priv *bat_priv = netdev_priv(net_dev);
struct hashtable_t *hash = bat_priv->tt_local_hash;
struct tt_local_entry *tt_local_entry;
struct hard_iface *primary_if;
struct hlist_node *node;
struct hlist_head *head;
size_t buf_size, pos;
char *buff;
int i, ret = 0;
primary_if = primary_if_get_selected(bat_priv);
if (!primary_if) {
ret = seq_printf(seq, "BATMAN mesh %s disabled - "
"please specify interfaces to enable it\n",
net_dev->name);
goto out;
}
if (primary_if->if_status != IF_ACTIVE) {
ret = seq_printf(seq, "BATMAN mesh %s disabled - "
"primary interface not active\n",
net_dev->name);
goto out;
}
seq_printf(seq, "Locally retrieved addresses (from %s) "
"announced via TT:\n",
net_dev->name);
spin_lock_bh(&bat_priv->tt_lhash_lock);
buf_size = 1;
/* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
__hlist_for_each_rcu(node, head)
buf_size += 21;
rcu_read_unlock();
}
buff = kmalloc(buf_size, GFP_ATOMIC);
if (!buff) {
spin_unlock_bh(&bat_priv->tt_lhash_lock);
ret = -ENOMEM;
goto out;
}
buff[0] = '\0';
pos = 0;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_local_entry, node,
head, hash_entry) {
pos += snprintf(buff + pos, 22, " * %pM\n",
tt_local_entry->addr);
}
rcu_read_unlock();
}
spin_unlock_bh(&bat_priv->tt_lhash_lock);
seq_printf(seq, "%s", buff);
kfree(buff);
out:
if (primary_if)
hardif_free_ref(primary_if);
return ret;
}
static void _tt_local_del(struct hlist_node *node, void *arg)
{
struct bat_priv *bat_priv = arg;
void *data = container_of(node, struct tt_local_entry, hash_entry);
kfree(data);
bat_priv->num_local_tt--;
atomic_set(&bat_priv->tt_local_changed, 1);
}
static void tt_local_del(struct bat_priv *bat_priv,
struct tt_local_entry *tt_local_entry,
const char *message)
{
bat_dbg(DBG_ROUTES, bat_priv, "Deleting local tt entry (%pM): %s\n",
tt_local_entry->addr, message);
hash_remove(bat_priv->tt_local_hash, compare_ltt, choose_orig,
tt_local_entry->addr);
_tt_local_del(&tt_local_entry->hash_entry, bat_priv);
}
void tt_local_remove(struct bat_priv *bat_priv,
const uint8_t *addr, const char *message)
{
struct tt_local_entry *tt_local_entry;
spin_lock_bh(&bat_priv->tt_lhash_lock);
tt_local_entry = tt_local_hash_find(bat_priv, addr);
if (tt_local_entry)
tt_local_del(bat_priv, tt_local_entry, message);
spin_unlock_bh(&bat_priv->tt_lhash_lock);
}
static void tt_local_purge(struct work_struct *work)
{
struct delayed_work *delayed_work =
container_of(work, struct delayed_work, work);
struct bat_priv *bat_priv =
container_of(delayed_work, struct bat_priv, tt_work);
struct hashtable_t *hash = bat_priv->tt_local_hash;
struct tt_local_entry *tt_local_entry;
struct hlist_node *node, *node_tmp;
struct hlist_head *head;
unsigned long timeout;
int i;
spin_lock_bh(&bat_priv->tt_lhash_lock);
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
head, hash_entry) {
if (tt_local_entry->never_purge)
continue;
timeout = tt_local_entry->last_seen;
timeout += TT_LOCAL_TIMEOUT * HZ;
if (time_before(jiffies, timeout))
continue;
tt_local_del(bat_priv, tt_local_entry,
"address timed out");
}
}
spin_unlock_bh(&bat_priv->tt_lhash_lock);
tt_local_start_timer(bat_priv);
}
void tt_local_free(struct bat_priv *bat_priv)
{
if (!bat_priv->tt_local_hash)
return;
cancel_delayed_work_sync(&bat_priv->tt_work);
hash_delete(bat_priv->tt_local_hash, _tt_local_del, bat_priv);
bat_priv->tt_local_hash = NULL;
}
int tt_global_init(struct bat_priv *bat_priv)
{
if (bat_priv->tt_global_hash)
return 1;
bat_priv->tt_global_hash = hash_new(1024);
if (!bat_priv->tt_global_hash)
return 0;
return 1;
}
void tt_global_add_orig(struct bat_priv *bat_priv,
struct orig_node *orig_node,
const unsigned char *tt_buff, int tt_buff_len)
{
struct tt_global_entry *tt_global_entry;
struct tt_local_entry *tt_local_entry;
int tt_buff_count = 0;
const unsigned char *tt_ptr;
while ((tt_buff_count + 1) * ETH_ALEN <= tt_buff_len) {
spin_lock_bh(&bat_priv->tt_ghash_lock);
tt_ptr = tt_buff + (tt_buff_count * ETH_ALEN);
tt_global_entry = tt_global_hash_find(bat_priv, tt_ptr);
if (!tt_global_entry) {
spin_unlock_bh(&bat_priv->tt_ghash_lock);
tt_global_entry =
kmalloc(sizeof(struct tt_global_entry),
GFP_ATOMIC);
if (!tt_global_entry)
break;
memcpy(tt_global_entry->addr, tt_ptr, ETH_ALEN);
bat_dbg(DBG_ROUTES, bat_priv,
"Creating new global tt entry: "
"%pM (via %pM)\n",
tt_global_entry->addr, orig_node->orig);
spin_lock_bh(&bat_priv->tt_ghash_lock);
hash_add(bat_priv->tt_global_hash, compare_gtt,
choose_orig, tt_global_entry,
&tt_global_entry->hash_entry);
}
tt_global_entry->orig_node = orig_node;
spin_unlock_bh(&bat_priv->tt_ghash_lock);
/* remove address from local hash if present */
spin_lock_bh(&bat_priv->tt_lhash_lock);
tt_ptr = tt_buff + (tt_buff_count * ETH_ALEN);
tt_local_entry = tt_local_hash_find(bat_priv, tt_ptr);
if (tt_local_entry)
tt_local_del(bat_priv, tt_local_entry,
"global tt received");
spin_unlock_bh(&bat_priv->tt_lhash_lock);
tt_buff_count++;
}
/* initialize, and overwrite if malloc succeeds */
orig_node->tt_buff = NULL;
orig_node->tt_buff_len = 0;
if (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;
}
}
}
int tt_global_seq_print_text(struct seq_file *seq, void *offset)
{
struct net_device *net_dev = (struct net_device *)seq->private;
struct bat_priv *bat_priv = netdev_priv(net_dev);
struct hashtable_t *hash = bat_priv->tt_global_hash;
struct tt_global_entry *tt_global_entry;
struct hard_iface *primary_if;
struct hlist_node *node;
struct hlist_head *head;
size_t buf_size, pos;
char *buff;
int i, ret = 0;
primary_if = primary_if_get_selected(bat_priv);
if (!primary_if) {
ret = seq_printf(seq, "BATMAN mesh %s disabled - please "
"specify interfaces to enable it\n",
net_dev->name);
goto out;
}
if (primary_if->if_status != IF_ACTIVE) {
ret = seq_printf(seq, "BATMAN mesh %s disabled - "
"primary interface not active\n",
net_dev->name);
goto out;
}
seq_printf(seq,
"Globally announced TT entries received via the mesh %s\n",
net_dev->name);
spin_lock_bh(&bat_priv->tt_ghash_lock);
buf_size = 1;
/* Estimate length for: " * xx:xx:xx:xx:xx:xx via xx:xx:xx:xx:xx:xx\n"*/
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
__hlist_for_each_rcu(node, head)
buf_size += 43;
rcu_read_unlock();
}
buff = kmalloc(buf_size, GFP_ATOMIC);
if (!buff) {
spin_unlock_bh(&bat_priv->tt_ghash_lock);
ret = -ENOMEM;
goto out;
}
buff[0] = '\0';
pos = 0;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_global_entry, node,
head, hash_entry) {
pos += snprintf(buff + pos, 44,
" * %pM via %pM\n",
tt_global_entry->addr,
tt_global_entry->orig_node->orig);
}
rcu_read_unlock();
}
spin_unlock_bh(&bat_priv->tt_ghash_lock);
seq_printf(seq, "%s", buff);
kfree(buff);
out:
if (primary_if)
hardif_free_ref(primary_if);
return ret;
}
static void _tt_global_del_orig(struct bat_priv *bat_priv,
struct tt_global_entry *tt_global_entry,
const char *message)
{
bat_dbg(DBG_ROUTES, bat_priv,
"Deleting global tt entry %pM (via %pM): %s\n",
tt_global_entry->addr, tt_global_entry->orig_node->orig,
message);
hash_remove(bat_priv->tt_global_hash, compare_gtt, choose_orig,
tt_global_entry->addr);
kfree(tt_global_entry);
}
void tt_global_del_orig(struct bat_priv *bat_priv,
struct orig_node *orig_node, const char *message)
{
struct tt_global_entry *tt_global_entry;
int tt_buff_count = 0;
unsigned char *tt_ptr;
if (orig_node->tt_buff_len == 0)
return;
spin_lock_bh(&bat_priv->tt_ghash_lock);
while ((tt_buff_count + 1) * ETH_ALEN <= orig_node->tt_buff_len) {
tt_ptr = orig_node->tt_buff + (tt_buff_count * ETH_ALEN);
tt_global_entry = tt_global_hash_find(bat_priv, tt_ptr);
if ((tt_global_entry) &&
(tt_global_entry->orig_node == orig_node))
_tt_global_del_orig(bat_priv, tt_global_entry,
message);
tt_buff_count++;
}
spin_unlock_bh(&bat_priv->tt_ghash_lock);
orig_node->tt_buff_len = 0;
kfree(orig_node->tt_buff);
orig_node->tt_buff = NULL;
}
static void tt_global_del(struct hlist_node *node, void *arg)
{
void *data = container_of(node, struct tt_global_entry, hash_entry);
kfree(data);
}
void tt_global_free(struct bat_priv *bat_priv)
{
if (!bat_priv->tt_global_hash)
return;
hash_delete(bat_priv->tt_global_hash, tt_global_del, NULL);
bat_priv->tt_global_hash = NULL;
}
struct orig_node *transtable_search(struct bat_priv *bat_priv,
const uint8_t *addr)
{
struct tt_global_entry *tt_global_entry;
struct orig_node *orig_node = NULL;
spin_lock_bh(&bat_priv->tt_ghash_lock);
tt_global_entry = tt_global_hash_find(bat_priv, addr);
if (!tt_global_entry)
goto out;
if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
goto out;
orig_node = tt_global_entry->orig_node;
out:
spin_unlock_bh(&bat_priv->tt_ghash_lock);
return orig_node;
}