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batman-adv: protect neighbor nodes with reference counters

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Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
This commit is contained in:
Marek Lindner 2010-12-12 21:57:10 +00:00
parent 8d68921856
commit a8e7f4bc38
4 changed files with 28 additions and 8 deletions
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20
net/batman-adv/originator.c
View File

@ -59,9 +59,18 @@ err:
return 0;
}
struct neigh_node *
create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node,
uint8_t *neigh, struct batman_if *if_incoming)
void neigh_node_free_ref(struct kref *refcount)
{
struct neigh_node *neigh_node;
neigh_node = container_of(refcount, struct neigh_node, refcount);
kfree(neigh_node);
}
struct neigh_node *create_neighbor(struct orig_node *orig_node,
struct orig_node *orig_neigh_node,
uint8_t *neigh,
struct batman_if *if_incoming)
{
struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
struct neigh_node *neigh_node;
@ -78,6 +87,7 @@ create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node,
memcpy(neigh_node->addr, neigh, ETH_ALEN);
neigh_node->orig_node = orig_neigh_node;
neigh_node->if_incoming = if_incoming;
kref_init(&neigh_node->refcount);
list_add_tail(&neigh_node->list, &orig_node->neigh_list);
return neigh_node;
@ -95,7 +105,7 @@ static void free_orig_node(void *data, void *arg)
neigh_node = list_entry(list_pos, struct neigh_node, list);
list_del(list_pos);
kfree(neigh_node);
kref_put(&neigh_node->refcount, neigh_node_free_ref);
}
frag_list_free(&orig_node->frag_list);
@ -216,7 +226,7 @@ static bool purge_orig_neighbors(struct bat_priv *bat_priv,
neigh_purged = true;
list_del(list_pos);
kfree(neigh_node);
kref_put(&neigh_node->refcount, neigh_node_free_ref);
} else {
if ((!*best_neigh_node) ||
(neigh_node->tq_avg > (*best_neigh_node)->tq_avg))

8
net/batman-adv/originator.h
View File

@ -26,9 +26,11 @@ 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);
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,
uint8_t *neigh, struct batman_if *if_incoming);
struct neigh_node *create_neighbor(struct orig_node *orig_node,
struct orig_node *orig_neigh_node,
uint8_t *neigh,
struct batman_if *if_incoming);
void neigh_node_free_ref(struct kref *refcount);
int orig_seq_print_text(struct seq_file *seq, void *offset);
int orig_hash_add_if(struct batman_if *batman_if, int max_if_num);
int orig_hash_del_if(struct batman_if *batman_if, int max_if_num);

7
net/batman-adv/routing.c
View File

@ -89,6 +89,8 @@ static void update_route(struct bat_priv *bat_priv,
struct neigh_node *neigh_node,
unsigned char *hna_buff, int hna_buff_len)
{
struct neigh_node *neigh_node_tmp;
/* route deleted */
if ((orig_node->router) && (!neigh_node)) {
@ -115,7 +117,12 @@ static void update_route(struct bat_priv *bat_priv,
orig_node->router->addr);
}
if (neigh_node)
kref_get(&neigh_node->refcount);
neigh_node_tmp = orig_node->router;
orig_node->router = neigh_node;
if (neigh_node_tmp)
kref_put(&neigh_node_tmp->refcount, neigh_node_free_ref);
}

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

@ -115,6 +115,7 @@ struct neigh_node {
struct neigh_node *next_bond_candidate;
unsigned long last_valid;
unsigned long real_bits[NUM_WORDS];
struct kref refcount;
struct orig_node *orig_node;
struct batman_if *if_incoming;
};