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batman-adv: protect ogm counter arrays with spinlock 

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 16b1aba849
commit 2ae2daf6c3
3 changed files with 33 additions and 6 deletions
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11
net/batman-adv/originator.c
View File

@ -207,6 +207,7 @@ struct orig_node *get_orig_node(struct bat_priv *bat_priv, uint8_t *addr)
return NULL;
INIT_HLIST_HEAD(&orig_node->neigh_list);
spin_lock_init(&orig_node->ogm_cnt_lock);
spin_lock_init(&orig_node->neigh_list_lock);
kref_init(&orig_node->refcount);
@ -517,7 +518,7 @@ int orig_hash_add_if(struct batman_if *batman_if, int max_if_num)
struct hlist_head *head;
struct element_t *bucket;
struct orig_node *orig_node;
int i;
int i, ret;
/* resize all orig nodes because orig_node->bcast_own(_sum) depend on
* if_num */
@ -530,7 +531,11 @@ int orig_hash_add_if(struct batman_if *batman_if, int max_if_num)
hlist_for_each_entry_rcu(bucket, walk, head, hlist) {
orig_node = bucket->data;
if (orig_node_add_if(orig_node, max_if_num) == -1)
spin_lock_bh(&orig_node->ogm_cnt_lock);
ret = orig_node_add_if(orig_node, max_if_num);
spin_unlock_bh(&orig_node->ogm_cnt_lock);
if (ret == -1)
goto err;
}
rcu_read_unlock();
@ -619,8 +624,10 @@ int orig_hash_del_if(struct batman_if *batman_if, int max_if_num)
hlist_for_each_entry_rcu(bucket, walk, head, hlist) {
orig_node = bucket->data;
spin_lock_bh(&orig_node->ogm_cnt_lock);
ret = orig_node_del_if(orig_node, max_if_num,
batman_if->if_num);
spin_unlock_bh(&orig_node->ogm_cnt_lock);
if (ret == -1)
goto err;

27
net/batman-adv/routing.c
View File

@ -55,12 +55,14 @@ void slide_own_bcast_window(struct batman_if *batman_if)
rcu_read_lock();
hlist_for_each_entry_rcu(bucket, walk, head, hlist) {
orig_node = bucket->data;
spin_lock_bh(&orig_node->ogm_cnt_lock);
word_index = batman_if->if_num * NUM_WORDS;
word = &(orig_node->bcast_own[word_index]);
bit_get_packet(bat_priv, word, 1, 0);
orig_node->bcast_own_sum[batman_if->if_num] =
bit_packet_count(word);
spin_unlock_bh(&orig_node->ogm_cnt_lock);
}
rcu_read_unlock();
}
@ -278,8 +280,10 @@ static void update_orig(struct bat_priv *bat_priv,
char is_duplicate)
{
struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
struct orig_node *orig_node_tmp;
struct hlist_node *node;
int tmp_hna_buff_len;
uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;
bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): "
"Searching and updating originator entry of received packet\n");
@ -351,10 +355,22 @@ static void update_orig(struct bat_priv *bat_priv,
/* if the TQ is the same and the link not more symetric we
* won't consider it either */
if ((orig_node->router) &&
((neigh_node->tq_avg == orig_node->router->tq_avg) &&
(orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num]
>= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
goto update_hna;
(neigh_node->tq_avg == orig_node->router->tq_avg)) {
orig_node_tmp = orig_node->router->orig_node;
spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
bcast_own_sum_orig =
orig_node_tmp->bcast_own_sum[if_incoming->if_num];
spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
orig_node_tmp = neigh_node->orig_node;
spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
bcast_own_sum_neigh =
orig_node_tmp->bcast_own_sum[if_incoming->if_num];
spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
if (bcast_own_sum_orig >= bcast_own_sum_neigh)
goto update_hna;
}
update_routes(bat_priv, orig_node, neigh_node,
hna_buff, tmp_hna_buff_len);
@ -705,10 +721,13 @@ void receive_bat_packet(struct ethhdr *ethhdr,
batman_packet->orig) &&
(batman_packet->seqno - if_incoming_seqno + 2 == 0)) {
offset = if_incoming->if_num * NUM_WORDS;
spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
word = &(orig_neigh_node->bcast_own[offset]);
bit_mark(word, 0);
orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
bit_packet_count(word);
spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
}
bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: "

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

@ -89,6 +89,7 @@ struct orig_node {
struct kref refcount;
struct bat_priv *bat_priv;
unsigned long last_frag_packet;
spinlock_t ogm_cnt_lock; /* protects ogm counter */
struct {
uint8_t candidates;
struct neigh_node *selected;