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batman-adv: allow multiple entries in tt_global_entries

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as backbone gateways will all independently announce the same clients,
also the tt global table must be able to hold multiple originators per
client entry.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
This commit is contained in:
Simon Wunderlich 2011-10-22 20:12:51 +02:00 committed by Antonio Quartulli
parent 9bf8e4d425
commit db08e6e557
2 changed files with 318 additions and 100 deletions
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409
net/batman-adv/translation-table.c
View File

@ -32,10 +32,8 @@
static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
struct orig_node *orig_node);
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);
static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry);
/* returns 1 if they are the same mac addr */
static int compare_tt(const struct hlist_node *node, const void *data2)
@ -125,17 +123,31 @@ static void tt_global_entry_free_rcu(struct rcu_head *rcu)
tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
common);
if (tt_global_entry->orig_node)
orig_node_free_ref(tt_global_entry->orig_node);
kfree(tt_global_entry);
}
static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry)
{
if (atomic_dec_and_test(&tt_global_entry->common.refcount))
if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
tt_global_del_orig_list(tt_global_entry);
call_rcu(&tt_global_entry->common.rcu,
tt_global_entry_free_rcu);
}
}
static void tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
{
struct tt_orig_list_entry *orig_entry;
orig_entry = container_of(rcu, struct tt_orig_list_entry, rcu);
atomic_dec(&orig_entry->orig_node->tt_size);
orig_node_free_ref(orig_entry->orig_node);
kfree(orig_entry);
}
static void tt_orig_list_entry_free_ref(struct tt_orig_list_entry *orig_entry)
{
call_rcu(&orig_entry->rcu, tt_orig_list_entry_free_rcu);
}
static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr,
@ -184,6 +196,9 @@ 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;
struct hlist_head *head;
struct hlist_node *node;
struct tt_orig_list_entry *orig_entry;
int hash_added;
tt_local_entry = tt_local_hash_find(bat_priv, addr);
@ -234,14 +249,21 @@ void tt_local_add(struct net_device *soft_iface, const uint8_t *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 ROAMING and has to be
* kept for consistency purpose */
/* 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;
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 |= TT_CLIENT_ROAM;
tt_global_entry->roam_at = jiffies;
send_roam_adv(bat_priv, tt_global_entry->common.addr,
tt_global_entry->orig_node);
}
out:
if (tt_local_entry)
@ -492,33 +514,76 @@ static void tt_changes_list_free(struct bat_priv *bat_priv)
spin_unlock_bh(&bat_priv->tt_changes_list_lock);
}
/* find out if an orig_node is already in the list of a tt_global_entry.
* returns 1 if found, 0 otherwise
*/
static bool tt_global_entry_has_orig(const struct tt_global_entry *entry,
const struct orig_node *orig_node)
{
struct tt_orig_list_entry *tmp_orig_entry;
const struct hlist_head *head;
struct hlist_node *node;
bool found = false;
rcu_read_lock();
head = &entry->orig_list;
hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) {
if (tmp_orig_entry->orig_node == orig_node) {
found = true;
break;
}
}
rcu_read_unlock();
return found;
}
static void tt_global_add_orig_entry(struct tt_global_entry *tt_global_entry,
struct orig_node *orig_node,
int ttvn)
{
struct tt_orig_list_entry *orig_entry;
orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
if (!orig_entry)
return;
INIT_HLIST_NODE(&orig_entry->list);
atomic_inc(&orig_node->refcount);
atomic_inc(&orig_node->tt_size);
orig_entry->orig_node = orig_node;
orig_entry->ttvn = ttvn;
spin_lock_bh(&tt_global_entry->list_lock);
hlist_add_head_rcu(&orig_entry->list,
&tt_global_entry->orig_list);
spin_unlock_bh(&tt_global_entry->list_lock);
}
/* caller must hold orig_node refcount */
int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
const unsigned char *tt_addr, uint8_t ttvn, bool roaming,
bool wifi)
{
struct tt_global_entry *tt_global_entry;
struct orig_node *orig_node_tmp;
struct tt_global_entry *tt_global_entry = NULL;
int ret = 0;
int hash_added;
tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
if (!tt_global_entry) {
tt_global_entry =
kmalloc(sizeof(*tt_global_entry),
GFP_ATOMIC);
tt_global_entry = kzalloc(sizeof(*tt_global_entry),
GFP_ATOMIC);
if (!tt_global_entry)
goto out;
memcpy(tt_global_entry->common.addr, tt_addr, ETH_ALEN);
tt_global_entry->common.flags = NO_FLAGS;
atomic_set(&tt_global_entry->common.refcount, 2);
/* 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->roam_at = 0;
atomic_set(&tt_global_entry->common.refcount, 2);
INIT_HLIST_HEAD(&tt_global_entry->orig_list);
spin_lock_init(&tt_global_entry->list_lock);
hash_added = hash_add(bat_priv->tt_global_hash, compare_tt,
choose_orig, &tt_global_entry->common,
@ -529,19 +594,27 @@ int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
tt_global_entry_free_ref(tt_global_entry);
goto out_remove;
}
atomic_inc(&orig_node->tt_size);
tt_global_add_orig_entry(tt_global_entry, orig_node, ttvn);
} 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);
/* there is already a global entry, use this one. */
/* If there is the TT_CLIENT_ROAM flag set, there is only one
* originator left in the list and we previously received a
* delete + roaming change for this originator.
*
* We should first delete the old originator before adding the
* new one.
*/
if (tt_global_entry->common.flags & TT_CLIENT_ROAM) {
tt_global_del_orig_list(tt_global_entry);
tt_global_entry->common.flags &= ~TT_CLIENT_ROAM;
tt_global_entry->roam_at = 0;
}
tt_global_entry->common.flags = NO_FLAGS;
tt_global_entry->ttvn = ttvn;
tt_global_entry->roam_at = 0;
if (!tt_global_entry_has_orig(tt_global_entry, orig_node))
tt_global_add_orig_entry(tt_global_entry, orig_node,
ttvn);
}
if (wifi)
@ -562,6 +635,34 @@ out:
return ret;
}
/* print all orig nodes who announce the address for this global entry.
* it is assumed that the caller holds rcu_read_lock();
*/
static void tt_global_print_entry(struct tt_global_entry *tt_global_entry,
struct seq_file *seq)
{
struct hlist_head *head;
struct hlist_node *node;
struct tt_orig_list_entry *orig_entry;
struct tt_common_entry *tt_common_entry;
uint16_t flags;
uint8_t last_ttvn;
tt_common_entry = &tt_global_entry->common;
head = &tt_global_entry->orig_list;
hlist_for_each_entry_rcu(orig_entry, node, head, list) {
flags = tt_common_entry->flags;
last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c]\n",
tt_global_entry->common.addr, orig_entry->ttvn,
orig_entry->orig_node->orig, last_ttvn,
(flags & TT_CLIENT_ROAM ? 'R' : '.'),
(flags & TT_CLIENT_WIFI ? 'W' : '.'));
}
}
int tt_global_seq_print_text(struct seq_file *seq, void *offset)
{
struct net_device *net_dev = (struct net_device *)seq->private;
@ -605,18 +706,7 @@ int tt_global_seq_print_text(struct seq_file *seq, void *offset)
tt_global_entry = container_of(tt_common_entry,
struct tt_global_entry,
common);
seq_printf(seq,
" * %pM (%3u) via %pM (%3u) [%c%c]\n",
tt_global_entry->common.addr,
tt_global_entry->ttvn,
tt_global_entry->orig_node->orig,
(uint8_t) atomic_read(
&tt_global_entry->orig_node->
last_ttvn),
(tt_global_entry->common.flags &
TT_CLIENT_ROAM ? 'R' : '.'),
(tt_global_entry->common.flags &
TT_CLIENT_WIFI ? 'W' : '.'));
tt_global_print_entry(tt_global_entry, seq);
}
rcu_read_unlock();
}
@ -626,27 +716,103 @@ out:
return ret;
}
static void _tt_global_del(struct bat_priv *bat_priv,
struct tt_global_entry *tt_global_entry,
const char *message)
/* deletes the orig list of a tt_global_entry */
static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry)
{
if (!tt_global_entry)
goto out;
struct hlist_head *head;
struct hlist_node *node, *safe;
struct tt_orig_list_entry *orig_entry;
spin_lock_bh(&tt_global_entry->list_lock);
head = &tt_global_entry->orig_list;
hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
hlist_del_rcu(node);
tt_orig_list_entry_free_ref(orig_entry);
}
spin_unlock_bh(&tt_global_entry->list_lock);
}
static void tt_global_del_orig_entry(struct bat_priv *bat_priv,
struct tt_global_entry *tt_global_entry,
struct orig_node *orig_node,
const char *message)
{
struct hlist_head *head;
struct hlist_node *node, *safe;
struct tt_orig_list_entry *orig_entry;
spin_lock_bh(&tt_global_entry->list_lock);
head = &tt_global_entry->orig_list;
hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
if (orig_entry->orig_node == orig_node) {
bat_dbg(DBG_TT, bat_priv,
"Deleting %pM from global tt entry %pM: %s\n",
orig_node->orig, tt_global_entry->common.addr,
message);
hlist_del_rcu(node);
tt_orig_list_entry_free_ref(orig_entry);
}
}
spin_unlock_bh(&tt_global_entry->list_lock);
}
static void tt_global_del_struct(struct bat_priv *bat_priv,
struct tt_global_entry *tt_global_entry,
const char *message)
{
bat_dbg(DBG_TT, bat_priv,
"Deleting global tt entry %pM (via %pM): %s\n",
tt_global_entry->common.addr, tt_global_entry->orig_node->orig,
message);
atomic_dec(&tt_global_entry->orig_node->tt_size);
"Deleting global tt entry %pM: %s\n",
tt_global_entry->common.addr, message);
hash_remove(bat_priv->tt_global_hash, compare_tt, choose_orig,
tt_global_entry->common.addr);
out:
if (tt_global_entry)
tt_global_entry_free_ref(tt_global_entry);
tt_global_entry_free_ref(tt_global_entry);
}
/* If the client is to be deleted, we check if it is the last origantor entry
* within tt_global entry. If yes, we set the TT_CLIENT_ROAM flag and the timer,
* otherwise we simply remove the originator scheduled for deletion.
*/
static void tt_global_del_roaming(struct bat_priv *bat_priv,
struct tt_global_entry *tt_global_entry,
struct orig_node *orig_node,
const char *message)
{
bool last_entry = true;
struct hlist_head *head;
struct hlist_node *node;
struct tt_orig_list_entry *orig_entry;
/* no local entry exists, case 1:
* Check if this is the last one or if other entries exist.
*/
rcu_read_lock();
head = &tt_global_entry->orig_list;
hlist_for_each_entry_rcu(orig_entry, node, head, list) {
if (orig_entry->orig_node != orig_node) {
last_entry = false;
break;
}
}
rcu_read_unlock();
if (last_entry) {
/* its the last one, mark for roaming. */
tt_global_entry->common.flags |= TT_CLIENT_ROAM;
tt_global_entry->roam_at = jiffies;
} else
/* there is another entry, we can simply delete this
* one and can still use the other one.
*/
tt_global_del_orig_entry(bat_priv, tt_global_entry,
orig_node, message);
}
static void tt_global_del(struct bat_priv *bat_priv,
struct orig_node *orig_node,
const unsigned char *addr,
@ -656,30 +822,44 @@ static void tt_global_del(struct bat_priv *bat_priv,
struct tt_local_entry *tt_local_entry = NULL;
tt_global_entry = tt_global_hash_find(bat_priv, addr);
if (!tt_global_entry || tt_global_entry->orig_node != orig_node)
if (!tt_global_entry)
goto out;
if (!roaming)
goto out_del;
if (!roaming) {
tt_global_del_orig_entry(bat_priv, tt_global_entry, orig_node,
message);
if (hlist_empty(&tt_global_entry->orig_list))
tt_global_del_struct(bat_priv, tt_global_entry,
message);
/* 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 => we mark
* it with TT_CLIENT_ROAM, we start a timer and we
* wait for node B to claim it. In case of timeout
* the entry is purged.
* 2) the client roamed to us => we can directly delete
* the global entry, since it is useless now. */
tt_local_entry = tt_local_hash_find(bat_priv,
tt_global_entry->common.addr);
if (!tt_local_entry) {
tt_global_entry->common.flags |= TT_CLIENT_ROAM;
tt_global_entry->roam_at = jiffies;
goto out;
}
out_del:
_tt_global_del(bat_priv, tt_global_entry, message);
/* if we are deleting a global entry due to a roam
* event, there are two possibilities:
* 1) the client roamed from node A to node B => if there
* is only one originator left for this client, we mark
* it with TT_CLIENT_ROAM, we start a timer and we
* wait for node B to claim it. In case of timeout
* the entry is purged.
*
* If there are other originators left, we directly delete
* the originator.
* 2) the client roamed to us => we can directly delete
* the global entry, since it is useless now. */
tt_local_entry = tt_local_hash_find(bat_priv,
tt_global_entry->common.addr);
if (tt_local_entry) {
/* local entry exists, case 2: client roamed to us. */
tt_global_del_orig_list(tt_global_entry);
tt_global_del_struct(bat_priv, tt_global_entry, message);
} else
/* no local entry exists, case 1: check for roaming */
tt_global_del_roaming(bat_priv, tt_global_entry, orig_node,
message);
out:
if (tt_global_entry)
@ -712,11 +892,14 @@ void tt_global_del_orig(struct bat_priv *bat_priv,
tt_global_entry = container_of(tt_common_entry,
struct tt_global_entry,
common);
if (tt_global_entry->orig_node == orig_node) {
tt_global_del_orig_entry(bat_priv, tt_global_entry,
orig_node, message);
if (hlist_empty(&tt_global_entry->orig_list)) {
bat_dbg(DBG_TT, bat_priv,
"Deleting global tt entry %pM (via %pM): %s\n",
"Deleting global tt entry %pM: %s\n",
tt_global_entry->common.addr,
tt_global_entry->orig_node->orig,
message);
hlist_del_rcu(node);
tt_global_entry_free_ref(tt_global_entry);
@ -757,7 +940,7 @@ static void tt_global_roam_purge(struct bat_priv *bat_priv)
bat_dbg(DBG_TT, bat_priv,
"Deleting global tt entry (%pM): Roaming timeout\n",
tt_global_entry->common.addr);
atomic_dec(&tt_global_entry->orig_node->tt_size);
hlist_del_rcu(node);
tt_global_entry_free_ref(tt_global_entry);
}
@ -820,6 +1003,11 @@ struct orig_node *transtable_search(struct bat_priv *bat_priv,
struct tt_local_entry *tt_local_entry = NULL;
struct tt_global_entry *tt_global_entry = NULL;
struct orig_node *orig_node = NULL;
struct neigh_node *router = NULL;
struct hlist_head *head;
struct hlist_node *node;
struct tt_orig_list_entry *orig_entry;
int best_tq;
if (src && atomic_read(&bat_priv->ap_isolation)) {
tt_local_entry = tt_local_hash_find(bat_priv, src);
@ -836,11 +1024,25 @@ struct orig_node *transtable_search(struct bat_priv *bat_priv,
if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry))
goto out;
if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
goto out;
best_tq = 0;
orig_node = tt_global_entry->orig_node;
rcu_read_lock();
head = &tt_global_entry->orig_list;
hlist_for_each_entry_rcu(orig_entry, node, head, list) {
router = orig_node_get_router(orig_entry->orig_node);
if (!router)
continue;
if (router->tq_avg > best_tq) {
orig_node = orig_entry->orig_node;
best_tq = router->tq_avg;
}
neigh_node_free_ref(router);
}
/* found anything? */
if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
orig_node = NULL;
rcu_read_unlock();
out:
if (tt_global_entry)
tt_global_entry_free_ref(tt_global_entry);
@ -872,20 +1074,26 @@ static uint16_t tt_global_crc(struct bat_priv *bat_priv,
tt_global_entry = container_of(tt_common_entry,
struct tt_global_entry,
common);
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_common_entry->flags & TT_CLIENT_ROAM)
continue;
total_one = 0;
for (j = 0; j < ETH_ALEN; j++)
total_one = crc16_byte(total_one,
tt_common_entry->addr[j]);
total ^= total_one;
}
/* Roaming clients are in the global table for
* consistency only. They don't have to be
* taken into account while computing the
* global crc
*/
if (tt_global_entry->common.flags & TT_CLIENT_ROAM)
continue;
/* find out if this global entry is announced by this
* originator
*/
if (!tt_global_entry_has_orig(tt_global_entry,
orig_node))
continue;
total_one = 0;
for (j = 0; j < ETH_ALEN; j++)
total_one = crc16_byte(total_one,
tt_global_entry->common.addr[j]);
total ^= total_one;
}
rcu_read_unlock();
}
@ -1026,7 +1234,7 @@ static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
common);
return (tt_global_entry->orig_node == orig_node);
return tt_global_entry_has_orig(tt_global_entry, orig_node);
}
static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
@ -1802,6 +2010,8 @@ void tt_commit_changes(struct bat_priv *bat_priv)
/* Increment the TTVN only once per OGM interval */
atomic_inc(&bat_priv->ttvn);
bat_dbg(DBG_TT, bat_priv, "Local changes committed, updating to ttvn %u\n",
(uint8_t)atomic_read(&bat_priv->ttvn));
bat_priv->tt_poss_change = false;
}
@ -1879,6 +2089,7 @@ void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node,
} else {
/* if we missed more than one change or our tables are not
* in sync anymore -> request fresh tt data */
if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
orig_node->tt_crc != tt_crc) {
request_table:

9
net/batman-adv/types.h
View File

@ -241,9 +241,16 @@ struct tt_local_entry {
struct tt_global_entry {
struct tt_common_entry common;
struct hlist_head orig_list;
spinlock_t list_lock; /* protects the list */
unsigned long roam_at; /* time at which TT_GLOBAL_ROAM was set */
};
struct tt_orig_list_entry {
struct orig_node *orig_node;
uint8_t ttvn;
unsigned long roam_at; /* time at which TT_GLOBAL_ROAM was set */
struct rcu_head rcu;
struct hlist_node list;
};
struct backbone_gw {