netfilter: nfnetlink_queue: autoload nf_conntrack_netlink module NFQA_CFG_F_CONNTRACK config flag

This patch enables to load nf_conntrack_netlink module if
NFQA_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, 11 insertions, 0 deletions

diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index c1f6df4cfe88..1d3936587ace 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -1147,6 +1147,17 @@ static int nfqnl_recv_config(struct net *net, struct sock *ctnl,
                 if (flags & mask & NFQA_CFG_F_SECCTX)
                         return -EOPNOTSUPP;
 #endif
+                if ((flags & mask & NFQA_CFG_F_CONNTRACK) &&
+                    !rcu_access_pointer(nfnl_ct_hook)) {
+#ifdef CONFIG_MODULES
+                        nfnl_unlock(NFNL_SUBSYS_QUEUE);
+                        request_module("ip_conntrack_netlink");
+                        nfnl_lock(NFNL_SUBSYS_QUEUE);
+                        if (rcu_access_pointer(nfnl_ct_hook))
+                                return -EAGAIN;
+#endif
+                        return -EOPNOTSUPP;
+                }
         }
 
         rcu_read_lock();