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[NETFILTER]: nf_conntrack: properly use RCU for nf_conntrack_destroyed callback

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Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-02-12 11:14:11 -08:00 committed by David S. Miller
parent 6b48a7d08d
commit 982d9a9ce3
2 changed files with 10 additions and 6 deletions
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7
net/ipv4/netfilter/nf_nat_core.c
View file

@ -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);
}

9
net/netfilter/nf_conntrack_core.c
View file

@ -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,