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authorPavel Emelyanov <xemul@openvz.org>2007-11-29 23:58:58 +1100
committerHerbert Xu <herbert@gondor.apana.org.au>2007-11-29 23:58:58 +1100
commit82de382ce8e1c7645984616728dc7aaa057821e4 (patch)
tree980ce308c87e8aa9bbf8381251b805d7d6a108c4
parent17efdd45755c0eb8d1418a1368ef7c7ebbe98c6e (diff)
[BRIDGE]: Properly dereference the br_should_route_hook
This hook is protected with the RCU, so simple if (br_should_route_hook) br_should_route_hook(...) is not enough on some architectures. Use the rcu_dereference/rcu_assign_pointer in this case. Fixed Stephen's comment concerning using the typeof(). Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r--net/bridge/br_input.c7
-rw-r--r--net/bridge/netfilter/ebtable_broute.c4
2 files changed, 6 insertions, 5 deletions
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 3cedd4eeeed..0ee79a726d9 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -122,6 +122,7 @@ static inline int is_link_local(const unsigned char *dest)
struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)
{
const unsigned char *dest = eth_hdr(skb)->h_dest;
+ int (*rhook)(struct sk_buff *skb);
if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
goto drop;
@@ -147,9 +148,9 @@ struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)
switch (p->state) {
case BR_STATE_FORWARDING:
-
- if (br_should_route_hook) {
- if (br_should_route_hook(skb))
+ rhook = rcu_dereference(br_should_route_hook);
+ if (rhook != NULL) {
+ if (rhook(skb))
return skb;
dest = eth_hdr(skb)->h_dest;
}
diff --git a/net/bridge/netfilter/ebtable_broute.c b/net/bridge/netfilter/ebtable_broute.c
index e44519ebf1d..be6f1868105 100644
--- a/net/bridge/netfilter/ebtable_broute.c
+++ b/net/bridge/netfilter/ebtable_broute.c
@@ -70,13 +70,13 @@ static int __init ebtable_broute_init(void)
if (ret < 0)
return ret;
/* see br_input.c */
- br_should_route_hook = ebt_broute;
+ rcu_assign_pointer(br_should_route_hook, ebt_broute);
return ret;
}
static void __exit ebtable_broute_fini(void)
{
- br_should_route_hook = NULL;
+ rcu_assign_pointer(br_should_route_hook, NULL);
synchronize_net();
ebt_unregister_table(&broute_table);
}