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authorPatrick McHardy <kaber@trash.net>2007-02-12 11:14:11 -0800
committerDavid S. Miller <davem@davemloft.net>2007-02-12 11:14:11 -0800
commit982d9a9ce389c396bc83ce29d799937f379ddcb7 (patch)
tree5f470babe5eafa37aac006bc87a1fab31db80114 /net
parent[NETFILTER]: ip_conntrack: properly use RCU for ip_conntrack_destroyed callback (diff)
downloadlinux-dev-982d9a9ce389c396bc83ce29d799937f379ddcb7.tar.xz
linux-dev-982d9a9ce389c396bc83ce29d799937f379ddcb7.zip
[NETFILTER]: nf_conntrack: properly use RCU for nf_conntrack_destroyed callback
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/netfilter/nf_nat_core.c7
-rw-r--r--net/netfilter/nf_conntrack_core.c9
2 files changed, 10 insertions, 6 deletions
diff --git a/net/ipv4/netfilter/nf_nat_core.c b/net/ipv4/netfilter/nf_nat_core.c
index 5156d5d6c3b8..2c01378d3592 100644
--- a/net/ipv4/netfilter/nf_nat_core.c
+++ b/net/ipv4/netfilter/nf_nat_core.c
@@ -617,8 +617,8 @@ static int __init nf_nat_init(void)
}
/* FIXME: Man, this is a hack. <SIGH> */
- NF_CT_ASSERT(nf_conntrack_destroyed == NULL);
- nf_conntrack_destroyed = &nf_nat_cleanup_conntrack;
+ NF_CT_ASSERT(rcu_dereference(nf_conntrack_destroyed) == NULL);
+ rcu_assign_pointer(nf_conntrack_destroyed, nf_nat_cleanup_conntrack);
/* Initialize fake conntrack so that NAT will skip it */
nf_conntrack_untracked.status |= IPS_NAT_DONE_MASK;
@@ -642,7 +642,8 @@ static int clean_nat(struct nf_conn *i, void *data)
static void __exit nf_nat_cleanup(void)
{
nf_ct_iterate_cleanup(&clean_nat, NULL);
- nf_conntrack_destroyed = NULL;
+ rcu_assign_pointer(nf_conntrack_destroyed, NULL);
+ synchronize_rcu();
vfree(bysource);
nf_ct_l3proto_put(l3proto);
}
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index d59640e2377b..0cc150560fb7 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -318,6 +318,7 @@ destroy_conntrack(struct nf_conntrack *nfct)
struct nf_conn_help *help = nfct_help(ct);
struct nf_conntrack_l3proto *l3proto;
struct nf_conntrack_l4proto *l4proto;
+ typeof(nf_conntrack_destroyed) destroyed;
DEBUGP("destroy_conntrack(%p)\n", ct);
NF_CT_ASSERT(atomic_read(&nfct->use) == 0);
@@ -341,10 +342,12 @@ destroy_conntrack(struct nf_conntrack *nfct)
ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.protonum);
if (l4proto && l4proto->destroy)
l4proto->destroy(ct);
- rcu_read_unlock();
- if (nf_conntrack_destroyed)
- nf_conntrack_destroyed(ct);
+ destroyed = rcu_dereference(nf_conntrack_destroyed);
+ if (destroyed)
+ destroyed(ct);
+
+ rcu_read_unlock();
write_lock_bh(&nf_conntrack_lock);
/* Expectations will have been removed in clean_from_lists,