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[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>
This commit is contained in:
Patrick McHardy 2007-12-17 22:42:51 -08:00 committed by David S. Miller
parent 1e796fda00
commit 051578ccbc
2 changed files with 11 additions and 6 deletions
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11
include/linux/netfilter.h
View File

@ -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
}

6
net/ipv4/netfilter/nf_nat_standalone.c
View File

@ -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 */