netfilter: nfnetlink_log: autoload nf_conntrack_netlink module NFQA_CFG_F_CONNTRACK config flag

This patch enables to load nf_conntrack_netlink module if
NFULNL_CFG_F_CONNTRACK config flag is specified.

Signed-off-by: Ken-ichirou MATSUZAWA <chamas@h4.dion.ne.jp>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 10 insertions, 1 deletions

diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index e1d1187f6646..f8d9bd848f79 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -927,7 +927,16 @@ nfulnl_recv_config(struct sock *ctnl, struct sk_buff *skb,
                 }
 
                 if (flags & NFULNL_CFG_F_CONNTRACK &&
-                    rcu_access_pointer(nfnl_ct_hook) == NULL) {
+                    !rcu_access_pointer(nfnl_ct_hook)) {
+#ifdef CONFIG_MODULES
+                        nfnl_unlock(NFNL_SUBSYS_ULOG);
+                        request_module("ip_conntrack_netlink");
+                        nfnl_lock(NFNL_SUBSYS_ULOG);
+                        if (rcu_access_pointer(nfnl_ct_hook)) {
+                                ret = -EAGAIN;
+                                goto out;
+                        }
+#endif
                         ret = -EOPNOTSUPP;
                         goto out;
                 }