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authorAntonio Quartulli <ordex@autistici.org>2011-07-07 03:40:58 +0400
committerMarek Lindner <lindner_marek@yahoo.de>2011-07-07 20:49:26 +0400
commit058d0e26989e3da2fa031f551235f6ff1e0bc27c (patch)
treef39ce9771166b9a110a38c65621eb2128c152068 /net/batman-adv/translation-table.c
parentc8c991bf2076d711f14ff9063db306fd522ddcd4 (diff)
downloadlinux-058d0e26989e3da2fa031f551235f6ff1e0bc27c.tar.xz
batman-adv: keep local table consistency for further TT_RESPONSE
To keep transtable consistency among all the nodes, an originator must not send not yet announced clients within a full table TT_RESPONSE. Instead, deleted client have to be kept in the table in order to be sent within an immediate TT_RESPONSE. In this way all the nodes in the network will always provide the same response for the same request. All the modification are committed at the next ttvn increment event. Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Diffstat (limited to 'net/batman-adv/translation-table.c')
-rw-r--r--net/batman-adv/translation-table.c146
1 files changed, 120 insertions, 26 deletions
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 06d361d4ac4b..7cc67c0f4915 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -215,11 +215,14 @@ void tt_local_add(struct net_device *soft_iface, const uint8_t *addr)
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);
- atomic_inc(&bat_priv->num_local_tt);
-
/* remove address from global hash if present */
tt_global_entry = tt_global_hash_find(bat_priv, addr);
@@ -358,19 +361,17 @@ out:
return ret;
}
-static void tt_local_del(struct bat_priv *bat_priv,
- struct tt_local_entry *tt_local_entry,
- const char *message)
+static void tt_local_set_pending(struct bat_priv *bat_priv,
+ struct tt_local_entry *tt_local_entry,
+ uint16_t flags)
{
- bat_dbg(DBG_TT, bat_priv, "Deleting local tt entry (%pM): %s\n",
- tt_local_entry->addr, message);
-
- atomic_dec(&bat_priv->num_local_tt);
-
- hash_remove(bat_priv->tt_local_hash, compare_ltt, choose_orig,
- tt_local_entry->addr);
+ tt_local_event(bat_priv, tt_local_entry->addr,
+ tt_local_entry->flags | flags);
- tt_local_entry_free_ref(tt_local_entry);
+ /* 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,
@@ -379,14 +380,14 @@ void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
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_event(bat_priv, tt_local_entry->addr,
- tt_local_entry->flags | TT_CLIENT_DEL |
- (roaming ? TT_CLIENT_ROAM : NO_FLAGS));
- tt_local_del(bat_priv, tt_local_entry, message);
+ 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);
@@ -411,18 +412,19 @@ static void tt_local_purge(struct bat_priv *bat_priv)
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_event(bat_priv, tt_local_entry->addr,
- tt_local_entry->flags | TT_CLIENT_DEL);
- atomic_dec(&bat_priv->num_local_tt);
- bat_dbg(DBG_TT, bat_priv, "Deleting local "
- "tt entry (%pM): timed out\n",
+ 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);
- hlist_del_rcu(node);
- tt_local_entry_free_ref(tt_local_entry);
}
spin_unlock_bh(list_lock);
}
@@ -846,6 +848,10 @@ uint16_t tt_local_crc(struct bat_priv *bat_priv)
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,
@@ -935,6 +941,16 @@ unlock:
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;
@@ -1275,7 +1291,8 @@ static bool send_my_tt_response(struct bat_priv *bat_priv,
skb = tt_response_fill_table(tt_len, ttvn,
bat_priv->tt_local_hash,
- primary_if, NULL, NULL);
+ primary_if, tt_local_valid_entry,
+ NULL);
if (!skb)
goto out;
@@ -1400,6 +1417,10 @@ bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
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)
@@ -1620,3 +1641,76 @@ void tt_free(struct bat_priv *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;
+}