diff options
| author | Patrick McHardy <kaber@trash.net> | 2007-12-17 22:42:51 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 14:59:06 -0800 |
| commit | 051578ccbcdad3b24b621dfb652194e36759e8d5 (patch) | |
| tree | d0afda1f43bd1e6de4d38e9efa4c498723e7f206 | |
| parent | 1e796fda00f06bac584f0e4ad8750ab9430d79d3 (diff) | |
[NETFILTER]: nf_nat: properly use RCU for ip_nat_decode_session
We need to use rcu_assign_pointer/rcu_dereference to avoid races.
Also remove an obsolete CONFIG_IP_NAT_NEEDED ifdef.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/netfilter.h | 11 | ||||
| -rw-r--r-- | net/ipv4/netfilter/nf_nat_standalone.c | 6 |
2 files changed, 11 insertions, 6 deletions
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h index 0947424d01d..1a8487325a4 100644 --- a/include/linux/netfilter.h +++ b/include/linux/netfilter.h @@ -256,11 +256,16 @@ extern void (*ip_nat_decode_session)(struct sk_buff *, struct flowi *); static inline void nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, int family) { -#if defined(CONFIG_IP_NF_NAT_NEEDED) || defined(CONFIG_NF_NAT_NEEDED) +#ifdef CONFIG_NF_NAT_NEEDED void (*decodefn)(struct sk_buff *, struct flowi *); - if (family == AF_INET && (decodefn = ip_nat_decode_session) != NULL) - decodefn(skb, fl); + if (family == AF_INET) { + rcu_read_lock(); + decodefn = rcu_dereference(ip_nat_decode_session); + if (decodefn) + decodefn(skb, fl); + rcu_read_unlock(); + } #endif } diff --git a/net/ipv4/netfilter/nf_nat_standalone.c b/net/ipv4/netfilter/nf_nat_standalone.c index a2b02f01cc5..99b2c788d5a 100644 --- a/net/ipv4/netfilter/nf_nat_standalone.c +++ b/net/ipv4/netfilter/nf_nat_standalone.c @@ -332,7 +332,7 @@ static int __init nf_nat_standalone_init(void) #ifdef CONFIG_XFRM BUG_ON(ip_nat_decode_session != NULL); - ip_nat_decode_session = nat_decode_session; + rcu_assign_pointer(ip_nat_decode_session, nat_decode_session); #endif ret = nf_nat_rule_init(); if (ret < 0) { @@ -350,7 +350,7 @@ static int __init nf_nat_standalone_init(void) nf_nat_rule_cleanup(); cleanup_decode_session: #ifdef CONFIG_XFRM - ip_nat_decode_session = NULL; + rcu_assign_pointer(ip_nat_decode_session, NULL); synchronize_net(); #endif return ret; @@ -361,7 +361,7 @@ static void __exit nf_nat_standalone_fini(void) nf_unregister_hooks(nf_nat_ops, ARRAY_SIZE(nf_nat_ops)); nf_nat_rule_cleanup(); #ifdef CONFIG_XFRM - ip_nat_decode_session = NULL; + rcu_assign_pointer(ip_nat_decode_session, NULL); synchronize_net(); #endif /* Conntrack caches are unregistered in nf_conntrack_cleanup */ |