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translation-table.c
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/* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich, Antonio Quartulli
*
* 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 "send.h"
#include "hash.h"
#include "originator.h"
#include "routing.h"
#include "bridge_loop_avoidance.h"
#include <linux/crc16.h>
static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
struct batadv_orig_node *orig_node);
static void batadv_tt_purge(struct work_struct *work);
static void
batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
/* returns 1 if they are the same mac addr */
static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
{
const void *data1 = container_of(node, struct batadv_tt_common_entry,
hash_entry);
return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
}
static void batadv_tt_start_timer(struct batadv_priv *bat_priv)
{
INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
msecs_to_jiffies(5000));
}
static struct batadv_tt_common_entry *
batadv_tt_hash_find(struct batadv_hashtable *hash, const void *data)
{
struct hlist_head *head;
struct hlist_node *node;
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_tt_common_entry *tt_common_entry_tmp = NULL;
uint32_t index;
if (!hash)
return NULL;
index = batadv_choose_orig(data, hash->size);
head = &hash->table[index];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) {
if (!batadv_compare_eth(tt_common_entry, data))
continue;
if (!atomic_inc_not_zero(&tt_common_entry->refcount))
continue;
tt_common_entry_tmp = tt_common_entry;
break;
}
rcu_read_unlock();
return tt_common_entry_tmp;
}
static struct batadv_tt_local_entry *
batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const void *data)
{
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_tt_local_entry *tt_local_entry = NULL;
tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, data);
if (tt_common_entry)
tt_local_entry = container_of(tt_common_entry,
struct batadv_tt_local_entry,
common);
return tt_local_entry;
}
static struct batadv_tt_global_entry *
batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const void *data)
{
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_tt_global_entry *tt_global_entry = NULL;
tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, data);
if (tt_common_entry)
tt_global_entry = container_of(tt_common_entry,
struct batadv_tt_global_entry,
common);
return tt_global_entry;
}
static void
batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
{
if (atomic_dec_and_test(&tt_local_entry->common.refcount))
kfree_rcu(tt_local_entry, common.rcu);
}
static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
{
struct batadv_tt_common_entry *tt_common_entry;
struct batadv_tt_global_entry *tt_global_entry;
tt_common_entry = container_of(rcu, struct batadv_tt_common_entry, rcu);
tt_global_entry = container_of(tt_common_entry,
struct batadv_tt_global_entry, common);
kfree(tt_global_entry);
}
static void
batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
{
if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
batadv_tt_global_del_orig_list(tt_global_entry);
call_rcu(&tt_global_entry->common.rcu,
batadv_tt_global_entry_free_rcu);
}
}
static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
{
struct batadv_tt_orig_list_entry *orig_entry;
orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
batadv_orig_node_free_ref(orig_entry->orig_node);
kfree(orig_entry);
}
static void
batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
{
if (!atomic_dec_and_test(&orig_entry->refcount))
return;
/* to avoid race conditions, immediately decrease the tt counter */
atomic_dec(&orig_entry->orig_node->tt_size);
call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
}
static void batadv_tt_local_event(struct batadv_priv *bat_priv,
const uint8_t *addr, uint8_t flags)
{
struct batadv_tt_change_node *tt_change_node, *entry, *safe;
bool event_removed = false;
bool del_op_requested, del_op_entry;
tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
if (!tt_change_node)
return;
tt_change_node->change.flags = flags;
memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
del_op_requested = flags & BATADV_TT_CLIENT_DEL;
/* check for ADD+DEL or DEL+ADD events */
spin_lock_bh(&bat_priv->tt.changes_list_lock);
list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
list) {
if (!batadv_compare_eth(entry->change.addr, addr))
continue;
/* DEL+ADD in the same orig interval have no effect and can be
* removed to avoid silly behaviour on the receiver side. The
* other way around (ADD+DEL) can happen in case of roaming of
* a client still in the NEW state. Roaming of NEW clients is
* now possible due to automatically recognition of "temporary"
* clients
*/
del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
if (!del_op_requested && del_op_entry)
goto del;
if (del_op_requested && !del_op_entry)
goto del;
continue;
del:
list_del(&entry->list);
kfree(entry);
kfree(tt_change_node);
event_removed = true;
goto unlock;
}
/* track the change in the OGMinterval list */
list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
unlock:
spin_unlock_bh(&bat_priv->tt.changes_list_lock);
if (event_removed)
atomic_dec(&bat_priv->tt.local_changes);
else
atomic_inc(&bat_priv->tt.local_changes);
}
int batadv_tt_len(int changes_num)
{
return changes_num * sizeof(struct batadv_tt_change);
}
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;
return 0;
}
void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
int ifindex)
{
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
struct batadv_tt_local_entry *tt_local_entry = NULL;
struct batadv_tt_global_entry *tt_global_entry = NULL;
struct hlist_head *head;
struct hlist_node *node;
struct batadv_tt_orig_list_entry *orig_entry;
int hash_added;
tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
if (tt_local_entry) {
tt_local_entry->last_seen = jiffies;
/* possibly unset the BATADV_TT_CLIENT_PENDING flag */
tt_local_entry->common.flags &= ~BATADV_TT_CLIENT_PENDING;
goto out;
}
tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
if (!tt_local_entry)
goto out;
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Creating new local tt entry: %pM (ttvn: %d)\n", addr,
(uint8_t)atomic_read(&bat_priv->tt.vn));
memcpy(tt_local_entry->common.addr, addr, ETH_ALEN);
tt_local_entry->common.flags = BATADV_NO_FLAGS;
if (batadv_is_wifi_iface(ifindex))
tt_local_entry->common.flags |= BATADV_TT_CLIENT_WIFI;
atomic_set(&tt_local_entry->common.refcount, 2);
tt_local_entry->last_seen = jiffies;
/* the batman interface mac address should never be purged */
if (batadv_compare_eth(addr, soft_iface->dev_addr))
tt_local_entry->common.flags |= BATADV_TT_CLIENT_NOPURGE;
/* 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_entry->common.flags |= BATADV_TT_CLIENT_NEW;
hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
batadv_choose_orig,
&tt_local_entry->common,
&tt_local_entry->common.hash_entry);
if (unlikely(hash_added != 0)) {
/* remove the reference for the hash */
batadv_tt_local_entry_free_ref(tt_local_entry);
goto out;
}
batadv_tt_local_event(bat_priv, addr, tt_local_entry->common.flags);
/* remove address from global hash if present */
tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
/* Check whether it is a roaming! */
if (tt_global_entry) {
/* These node are probably going to update their tt table */
head = &tt_global_entry->orig_list;
rcu_read_lock();
hlist_for_each_entry_rcu(orig_entry, node, head, list) {
orig_entry->orig_node->tt_poss_change = true;
batadv_send_roam_adv(bat_priv,
tt_global_entry->common.addr,
orig_entry->orig_node);
}
rcu_read_unlock();
/* The global entry has to be marked as ROAMING and
* has to be kept for consistency purpose
*/
tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
tt_global_entry->roam_at = jiffies;
}
out:
if (tt_local_entry)
batadv_tt_local_entry_free_ref(tt_local_entry);
if (tt_global_entry)
batadv_tt_global_entry_free_ref(tt_global_entry);
}
static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff,
int *packet_buff_len,
int min_packet_len,
int new_packet_len)
{
unsigned char *new_buff;
new_buff = kmalloc(new_packet_len, GFP_ATOMIC);
/* keep old buffer if kmalloc should fail */
if (new_buff) {
memcpy(new_buff, *packet_buff, min_packet_len);
kfree(*packet_buff);
*packet_buff = new_buff;
*packet_buff_len = new_packet_len;
}
}
static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv,
unsigned char **packet_buff,
int *packet_buff_len,
int min_packet_len)
{
struct batadv_hard_iface *primary_if;
int req_len;
primary_if = batadv_primary_if_get_selected(bat_priv);
req_len = min_packet_len;
req_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes));
/* 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 ((!primary_if) || (req_len > primary_if->soft_iface->mtu))
req_len = min_packet_len;
batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len,
min_packet_len, req_len);
if (primary_if)
batadv_hardif_free_ref(primary_if);
}
static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv,
unsigned char **packet_buff,
int *packet_buff_len,
int min_packet_len)
{
struct batadv_tt_change_node *entry, *safe;
int count = 0, tot_changes = 0, new_len;
unsigned char *tt_buff;
batadv_tt_prepare_packet_buff(bat_priv, packet_buff,
packet_buff_len, min_packet_len);
new_len = *packet_buff_len - min_packet_len;
tt_buff = *packet_buff + min_packet_len;
if (new_len > 0)
tot_changes = new_len / batadv_tt_len(1);
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 (count < tot_changes) {
memcpy(tt_buff + batadv_tt_len(count),
&entry->change, sizeof(struct batadv_tt_change));
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;
/* check whether this new OGM has no changes due to size problems */
if (new_len > 0) {
/* if kmalloc() fails we will reply with the full table
* instead of providing the diff
*/
bat_priv->tt.last_changeset = kmalloc(new_len, GFP_ATOMIC);
if (bat_priv->tt.last_changeset) {
memcpy(bat_priv->tt.last_changeset, tt_buff, new_len);
bat_priv->tt.last_changeset_len = new_len;
}
}
spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
return count;
}
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_hard_iface *primary_if;
struct hlist_node *node;
struct hlist_head *head;
uint32_t i;
int ret = 0;
primary_if = batadv_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 != BATADV_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 (TTVN: %u):\n",
net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_common_entry, node,
head, hash_entry) {
seq_printf(seq, " * %pM [%c%c%c%c%c]\n",
tt_common_entry->addr,
(tt_common_entry->flags &
BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
(tt_common_entry->flags &
BATADV_TT_CLIENT_NOPURGE ? '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' : '.'));
}
rcu_read_unlock();
}
out:
if (primary_if)
batadv_hardif_free_ref(primary_if);
return ret;
}
static void
batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
struct batadv_tt_local_entry *tt_local_entry,
uint16_t flags, const char *message)
{
batadv_tt_local_event(bat_priv, tt_local_entry->common.addr,
tt_local_entry->common.flags | 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) pending to be removed: %s\n",
tt_local_entry->common.addr, message);
}
void batadv_tt_local_remove(struct batadv_priv *bat_priv, const uint8_t *addr,
const char *message, bool roaming)
{
struct batadv_tt_local_entry *tt_local_entry = NULL;
uint16_t flags;
tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr);
if (!tt_local_entry)
goto out;
flags = BATADV_TT_CLIENT_DEL;
if (roaming)
flags |= BATADV_TT_CLIENT_ROAM;
batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, message);
out:
if (tt_local_entry)
batadv_tt_local_entry_free_ref(tt_local_entry);
}
static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
struct hlist_head *head)
{
struct batadv_tt_local_entry *tt_local_entry;
struct batadv_tt_common_entry *tt_common_entry;
struct hlist_node *node, *node_tmp;
hlist_for_each_entry_safe(tt_common_entry, node, 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,
BATADV_TT_LOCAL_TIMEOUT))
continue;
batadv_tt_local_set_pending(bat_priv, tt_local_entry,
BATADV_TT_CLIENT_DEL, "timed out");
}
}
static void batadv_tt_local_purge(struct batadv_priv *bat_priv)
{
struct batadv_hashtable *hash = bat_priv->tt.local_hash;
struct hlist_head *head;
spinlock_t *list_lock; /* protects write access to the hash lists */
uint32_t i;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
list_lock = &hash->list_locks[i];
spin_lock_bh(list_lock);
batadv_tt_local_purge_list(bat_priv, head);
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 hlist_node *node, *node_tmp;
struct hlist_head *head;
uint32_t i;
if (!bat_priv->tt.local_hash)
return;
hash = bat_priv->tt.local_hash;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
list_lock = &hash->list_locks[i];
spin_lock_bh(list_lock);
hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
head, hash_entry) {
hlist_del_rcu(node);
tt_local = container_of(tt_common_entry,
struct batadv_tt_local_entry,
common);
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;
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;
struct hlist_node *node;
rcu_read_lock();
head = &entry->orig_list;
hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) {
if (tmp_orig_entry->orig_node != orig_node)
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)
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);
atomic_inc(&orig_node->tt_size);
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);
out:
if (orig_entry)
batadv_tt_orig_list_entry_free_ref(orig_entry);
}
/* caller must hold orig_node refcount */
int batadv_tt_global_add(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
const unsigned char *tt_addr, uint8_t flags,
uint8_t ttvn)
{
struct batadv_tt_global_entry *tt_global_entry = NULL;
int ret = 0;
int hash_added;
struct batadv_tt_common_entry *common;
tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr);
if (!tt_global_entry) {
tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
if (!tt_global_entry)
goto out;
common = &tt_global_entry->common;
memcpy(common->addr, tt_addr, ETH_ALEN);
common->flags = flags;
tt_global_entry->roam_at = 0;
atomic_set(&common->refcount, 2);
INIT_HLIST_HEAD(&tt_global_entry->orig_list);
spin_lock_init(&tt_global_entry->list_lock);
hash_added = batadv_hash_add(bat_priv->tt.global_hash,
batadv_compare_tt,
batadv_choose_orig, 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 {
/* there is already a global entry, use this one. */
/* 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 (tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM) {
batadv_tt_global_del_orig_list(tt_global_entry);
tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
tt_global_entry->roam_at = 0;
}
}
/* add the new orig_entry (if needed) */
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 (via %pM)\n",
tt_global_entry->common.addr, orig_node->orig);
out_remove:
/* remove address from local hash if present */
batadv_tt_local_remove(bat_priv, tt_global_entry->common.addr,
"global tt received",
flags & BATADV_TT_CLIENT_ROAM);
ret = 1;
out:
if (tt_global_entry)
batadv_tt_global_entry_free_ref(tt_global_entry);
return ret;
}
/* print all orig nodes who announce the address for this global entry.
* it is assumed that the caller holds rcu_read_lock();
*/
static void
batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry,
struct seq_file *seq)
{
struct hlist_head *head;
struct hlist_node *node;
struct batadv_tt_orig_list_entry *orig_entry;
struct batadv_tt_common_entry *tt_common_entry;
uint16_t flags;
uint8_t last_ttvn;
tt_common_entry = &tt_global_entry->common;
head = &tt_global_entry->orig_list;
hlist_for_each_entry_rcu(orig_entry, node, head, list) {
flags = tt_common_entry->flags;
last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c]\n",
tt_global_entry->common.addr, orig_entry->ttvn,
orig_entry->orig_node->orig, last_ttvn,
(flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
(flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'));
}
}
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_node *node;
struct hlist_head *head;
uint32_t i;
int ret = 0;
primary_if = batadv_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 != BATADV_IF_ACTIVE) {
ret = seq_printf(seq,
"BATMAN mesh %s disabled - primary interface not active\n",
net_dev->name);
goto out;
}
seq_printf(seq,
"Globally announced TT entries received via the mesh %s\n",
net_dev->name);
seq_printf(seq, " %-13s %s %-15s %s %s\n",
"Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(tt_common_entry, node,
head, hash_entry) {
tt_global = container_of(tt_common_entry,
struct batadv_tt_global_entry,
common);
batadv_tt_global_print_entry(tt_global, seq);
}
rcu_read_unlock();
}
out:
if (primary_if)
batadv_hardif_free_ref(primary_if);
return ret;
}
/* 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 *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, node, safe, head, list) {
hlist_del_rcu(node);
batadv_tt_orig_list_entry_free_ref(orig_entry);
}
spin_unlock_bh(&tt_global_entry->list_lock);
}
static void
batadv_tt_global_del_orig_entry(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 *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, node, safe, head, list) {
if (orig_entry->orig_node == orig_node) {
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Deleting %pM from global tt entry %pM: %s\n",
orig_node->orig,
tt_global_entry->common.addr, message);
hlist_del_rcu(node);
batadv_tt_orig_list_entry_free_ref(orig_entry);
}
}
spin_unlock_bh(&tt_global_entry->list_lock);
}
static void
batadv_tt_global_del_struct(struct batadv_priv *bat_priv,
struct batadv_tt_global_entry *tt_global_entry,
const char *message)
{
batadv_dbg(BATADV_DBG_TT, bat_priv,
"Deleting global tt entry %pM: %s\n",
tt_global_entry->common.addr, message);
batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
batadv_choose_orig, tt_global_entry->common.addr);
batadv_tt_global_entry_free_ref(tt_global_entry);
}
/* If the client is to be deleted, we check if it is the last origantor entry
* within tt_global entry. If yes, we set the 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 hlist_node *node;
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, node, head, list) {
if (orig_entry->orig_node != orig_node) {
last_entry = false;
break;
}
}
rcu_read_unlock();
if (last_entry) {
/* its the last one, mark for roaming. */
tt_global_entry->common.flags |= 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_entry(bat_priv, tt_global_entry,
orig_node, message);
}
static void batadv_tt_global_del(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
const unsigned char *addr,
const char *message, bool roaming)
{
struct batadv_tt_global_entry *tt_global_entry = NULL;
struct batadv_tt_local_entry *local_entry = NULL;
tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr);
if (!tt_global_entry)
goto out;
if (!roaming) {
batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
orig_node, message);
if (hlist_empty(&tt_global_entry->orig_list))
batadv_tt_global_del_struct(bat_priv, tt_global_entry,
message);
goto out;
}
/* if we are deleting a global entry due to a roam
* event, there are two possibilities:
* 1) the client roamed from node A to node B => if there
* is only one originator left for this client, we mark
* it with 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.
*/