linux/net/batman-adv/translation-table.c
Antonio Quartulli 980d55b20a batman-adv: keep global table consistency in case of roaming
To keep consistency of other originator tables, new clients detected as
roamed, are kept in the global table but are marked as TT_CLIENT_PENDING
They are purged only when the new ttvn is received by the corresponding
originator. Moreover they need to be considered as removed in case of global
transtable lookup.

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
2011-07-07 18:49:26 +02:00

1723 lines
45 KiB
C

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