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authorPatrick McHardy <kaber@trash.net>2007-02-12 11:13:58 -0800
committerDavid S. Miller <davem@davemloft.net>2007-02-12 11:13:58 -0800
commit6b48a7d08d1bb2e3932bce1662fe411304acc18f (patch)
treef0405cee3ff4fb3898a2a691e25cd77c31e392d8 /net/ipv4
parent[NETFILTER]: nf_conntrack: fix invalid conntrack statistics RCU assumption (diff)
downloadlinux-dev-6b48a7d08d1bb2e3932bce1662fe411304acc18f.tar.xz
linux-dev-6b48a7d08d1bb2e3932bce1662fe411304acc18f.zip
[NETFILTER]: ip_conntrack: properly use RCU for ip_conntrack_destroyed callback
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--net/ipv4/netfilter/ip_conntrack_core.c9
-rw-r--r--net/ipv4/netfilter/ip_nat_core.c7
2 files changed, 10 insertions, 6 deletions
diff --git a/net/ipv4/netfilter/ip_conntrack_core.c b/net/ipv4/netfilter/ip_conntrack_core.c
index a7e34d007ab0..07ba1dd136b5 100644
--- a/net/ipv4/netfilter/ip_conntrack_core.c
+++ b/net/ipv4/netfilter/ip_conntrack_core.c
@@ -303,6 +303,7 @@ destroy_conntrack(struct nf_conntrack *nfct)
struct ip_conntrack *ct = (struct ip_conntrack *)nfct;
struct ip_conntrack_protocol *proto;
struct ip_conntrack_helper *helper;
+ typeof(ip_conntrack_destroyed) destroyed;
DEBUGP("destroy_conntrack(%p)\n", ct);
IP_NF_ASSERT(atomic_read(&nfct->use) == 0);
@@ -322,10 +323,12 @@ destroy_conntrack(struct nf_conntrack *nfct)
proto = __ip_conntrack_proto_find(ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
if (proto && proto->destroy)
proto->destroy(ct);
- rcu_read_unlock();
- if (ip_conntrack_destroyed)
- ip_conntrack_destroyed(ct);
+ destroyed = rcu_dereference(ip_conntrack_destroyed);
+ if (destroyed)
+ destroyed(ct);
+
+ rcu_read_unlock();
write_lock_bh(&ip_conntrack_lock);
/* Expectations will have been removed in clean_from_lists,
diff --git a/net/ipv4/netfilter/ip_nat_core.c b/net/ipv4/netfilter/ip_nat_core.c
index 18daabc22069..40737fdbe9a7 100644
--- a/net/ipv4/netfilter/ip_nat_core.c
+++ b/net/ipv4/netfilter/ip_nat_core.c
@@ -604,8 +604,8 @@ static int __init ip_nat_init(void)
}
/* FIXME: Man, this is a hack. <SIGH> */
- IP_NF_ASSERT(ip_conntrack_destroyed == NULL);
- ip_conntrack_destroyed = &ip_nat_cleanup_conntrack;
+ IP_NF_ASSERT(rcu_dereference(ip_conntrack_destroyed) == NULL);
+ rcu_assign_pointer(ip_conntrack_destroyed, ip_nat_cleanup_conntrack);
/* Initialize fake conntrack so that NAT will skip it */
ip_conntrack_untracked.status |= IPS_NAT_DONE_MASK;
@@ -623,7 +623,8 @@ static int clean_nat(struct ip_conntrack *i, void *data)
static void __exit ip_nat_cleanup(void)
{
ip_ct_iterate_cleanup(&clean_nat, NULL);
- ip_conntrack_destroyed = NULL;
+ rcu_assign_pointer(ip_conntrack_destroyed, NULL);
+ synchronize_rcu();
vfree(bysource);
}