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author | Marek Lindner <lindner_marek@yahoo.de> | 2010-12-12 21:57:10 (GMT) |
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committer | Marek Lindner <lindner_marek@yahoo.de> | 2011-03-05 11:49:52 (GMT) |
commit | a8e7f4bc38c4a90ee308cd7f1f8604f71db59d05 (patch) | |
tree | eaad8069534691aaa06b316ce42fbeb81f380b20 /net/batman-adv | |
parent | 8d689218568174955129d0f0e9e4370a391b3609 (diff) | |
download | linux-fsl-qoriq-a8e7f4bc38c4a90ee308cd7f1f8604f71db59d05.tar.xz |
batman-adv: protect neighbor nodes with reference counters
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Diffstat (limited to 'net/batman-adv')
-rw-r--r-- | net/batman-adv/originator.c | 20 | ||||
-rw-r--r-- | net/batman-adv/originator.h | 8 | ||||
-rw-r--r-- | net/batman-adv/routing.c | 7 | ||||
-rw-r--r-- | net/batman-adv/types.h | 1 |
4 files changed, 28 insertions, 8 deletions
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c index 54863c9..b1b1773 100644 --- a/net/batman-adv/originator.c +++ b/net/batman-adv/originator.c @@ -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)) diff --git a/net/batman-adv/originator.h b/net/batman-adv/originator.h index 8019fbd..88e5c60 100644 --- a/net/batman-adv/originator.h +++ b/net/batman-adv/originator.h @@ -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); diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 8274140..36351d3 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -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); } diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 7270405..f9217d5 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -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; }; |