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batman-adv: protect originator nodes with reference counters 

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
This commit is contained in:
Marek Lindner 2011-01-19 20:01:42 +00:00
parent fb778ea173
commit 16b1aba849
4 changed files with 78 additions and 19 deletions
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61
net/batman-adv/originator.c
View File

@ -103,12 +103,13 @@ struct neigh_node *create_neighbor(struct orig_node *orig_node,
return neigh_node;
}
static void free_orig_node(void *data, void *arg)
void orig_node_free_ref(struct kref *refcount)
{
struct hlist_node *node, *node_tmp;
struct neigh_node *neigh_node;
struct orig_node *orig_node = (struct orig_node *)data;
struct bat_priv *bat_priv = (struct bat_priv *)arg;
struct orig_node *orig_node;
orig_node = container_of(refcount, struct orig_node, refcount);
spin_lock_bh(&orig_node->neigh_list_lock);
@ -122,7 +123,8 @@ static void free_orig_node(void *data, void *arg)
spin_unlock_bh(&orig_node->neigh_list_lock);
frag_list_free(&orig_node->frag_list);
hna_global_del_orig(bat_priv, orig_node, "originator timed out");
hna_global_del_orig(orig_node->bat_priv, orig_node,
"originator timed out");
kfree(orig_node->bcast_own);
kfree(orig_node->bcast_own_sum);
@ -131,17 +133,53 @@ static void free_orig_node(void *data, void *arg)
void originator_free(struct bat_priv *bat_priv)
{
if (!bat_priv->orig_hash)
struct hashtable_t *hash = bat_priv->orig_hash;
struct hlist_node *walk, *safe;
struct hlist_head *head;
struct element_t *bucket;
spinlock_t *list_lock; /* spinlock to protect write access */
struct orig_node *orig_node;
int i;
if (!hash)
return;
cancel_delayed_work_sync(&bat_priv->orig_work);
spin_lock_bh(&bat_priv->orig_hash_lock);
hash_delete(bat_priv->orig_hash, free_orig_node, bat_priv);
bat_priv->orig_hash = NULL;
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(bucket, walk, safe, head, hlist) {
orig_node = bucket->data;
hlist_del_rcu(walk);
call_rcu(&bucket->rcu, bucket_free_rcu);
kref_put(&orig_node->refcount, orig_node_free_ref);
}
spin_unlock_bh(list_lock);
}
hash_destroy(hash);
spin_unlock_bh(&bat_priv->orig_hash_lock);
}
static void bucket_free_orig_rcu(struct rcu_head *rcu)
{
struct element_t *bucket;
struct orig_node *orig_node;
bucket = container_of(rcu, struct element_t, rcu);
orig_node = bucket->data;
kref_put(&orig_node->refcount, orig_node_free_ref);
kfree(bucket);
}
/* this function finds or creates an originator entry for the given
* address if it does not exits */
struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr)
@ -156,8 +194,10 @@ struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr)
addr));
rcu_read_unlock();
if (orig_node)
if (orig_node) {
kref_get(&orig_node->refcount);
return orig_node;
}
bat_dbg(DBG_BATMAN, bat_priv,
"Creating new originator: %pM\n", addr);
@ -168,7 +208,9 @@ struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr)
INIT_HLIST_HEAD(&orig_node->neigh_list);
spin_lock_init(&orig_node->neigh_list_lock);
kref_init(&orig_node->refcount);
orig_node->bat_priv = bat_priv;
memcpy(orig_node->orig, addr, ETH_ALEN);
orig_node->router = NULL;
orig_node->hna_buff = NULL;
@ -197,6 +239,8 @@ struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr)
if (hash_added < 0)
goto free_bcast_own_sum;
/* extra reference for return */
kref_get(&orig_node->refcount);
return orig_node;
free_bcast_own_sum:
kfree(orig_node->bcast_own_sum);
@ -318,8 +362,7 @@ static void _purge_orig(struct bat_priv *bat_priv)
if (orig_node->gw_flags)
gw_node_delete(bat_priv, orig_node);
hlist_del_rcu(walk);
call_rcu(&bucket->rcu, bucket_free_rcu);
free_orig_node(orig_node, bat_priv);
call_rcu(&bucket->rcu, bucket_free_orig_rcu);
continue;
}

1
net/batman-adv/originator.h
View File

@ -25,6 +25,7 @@
int originator_init(struct bat_priv *bat_priv);
void originator_free(struct bat_priv *bat_priv);
void purge_orig_ref(struct bat_priv *bat_priv);
void orig_node_free_ref(struct kref *refcount);
struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr);
struct neigh_node *create_neighbor(struct orig_node *orig_node,
struct orig_node *orig_neigh_node,

33
net/batman-adv/routing.c
View File

@ -311,6 +311,8 @@ static void update_orig(struct bat_priv *bat_priv,
neigh_node = create_neighbor(orig_node, orig_tmp,
ethhdr->h_source, if_incoming);
kref_put(&orig_tmp->refcount, orig_node_free_ref);
if (!neigh_node)
goto unlock;
} else
@ -438,7 +440,7 @@ static char count_real_packets(struct ethhdr *ethhdr,
/* signalize caller that the packet is to be dropped. */
if (window_protected(bat_priv, seq_diff,
&orig_node->batman_seqno_reset))
return -1;
goto err;
rcu_read_lock();
hlist_for_each_entry_rcu(tmp_neigh_node, node,
@ -471,7 +473,12 @@ static char count_real_packets(struct ethhdr *ethhdr,
orig_node->last_real_seqno = batman_packet->seqno;
}
kref_put(&orig_node->refcount, orig_node_free_ref);
return is_duplicate;
err:
kref_put(&orig_node->refcount, orig_node_free_ref);
return -1;
}
/* copy primary address for bonding */
@ -686,7 +693,6 @@ void receive_bat_packet(struct ethhdr *ethhdr,
int offset;
orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
if (!orig_neigh_node)
return;
@ -707,6 +713,7 @@ void receive_bat_packet(struct ethhdr *ethhdr,
bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "
"originator packet from myself (via neighbor)\n");
kref_put(&orig_neigh_node->refcount, orig_node_free_ref);
return;
}
@ -727,13 +734,13 @@ void receive_bat_packet(struct ethhdr *ethhdr,
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: packet within seqno protection time "
"(sender: %pM)\n", ethhdr->h_source);
return;
goto out;
}
if (batman_packet->tq == 0) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: originator packet with tq equal 0\n");
return;
goto out;
}
/* avoid temporary routing loops */
@ -747,7 +754,7 @@ void receive_bat_packet(struct ethhdr *ethhdr,
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: ignoring all rebroadcast packets that "
"may make me loop (sender: %pM)\n", ethhdr->h_source);
return;
goto out;
}
/* if sender is a direct neighbor the sender mac equals
@ -756,14 +763,14 @@ void receive_bat_packet(struct ethhdr *ethhdr,
orig_node :
get_orig_node(bat_priv, ethhdr->h_source));
if (!orig_neigh_node)
return;
goto out_neigh;
/* drop packet if sender is not a direct neighbor and if we
* don't route towards it */
if (!is_single_hop_neigh && (!orig_neigh_node->router)) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: OGM via unknown neighbor!\n");
return;
goto out_neigh;
}
is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node,
@ -790,26 +797,32 @@ void receive_bat_packet(struct ethhdr *ethhdr,
bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: "
"rebroadcast neighbor packet with direct link flag\n");
return;
goto out_neigh;
}
/* multihop originator */
if (!is_bidirectional) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: not received via bidirectional link\n");
return;
goto out_neigh;
}
if (is_duplicate) {
bat_dbg(DBG_BATMAN, bat_priv,
"Drop packet: duplicate packet received\n");
return;
goto out_neigh;
}
bat_dbg(DBG_BATMAN, bat_priv,
"Forwarding packet: rebroadcast originator packet\n");
schedule_forward_packet(orig_node, ethhdr, batman_packet,
0, hna_buff_len, if_incoming);
out_neigh:
if (!is_single_hop_neigh)
kref_put(&orig_neigh_node->refcount, orig_node_free_ref);
out:
kref_put(&orig_node->refcount, orig_node_free_ref);
}
int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if)

2
net/batman-adv/types.h
View File

@ -86,6 +86,8 @@ struct orig_node {
struct hlist_head neigh_list;
struct list_head frag_list;
spinlock_t neigh_list_lock; /* protects neighbor list */
struct kref refcount;
struct bat_priv *bat_priv;
unsigned long last_frag_packet;
struct {
uint8_t candidates;