netlink: add nlk->netlink_bind hook for module auto-loading

This patch adds a hook in the binding path of netlink.

This is used by ctnetlink to allow module autoloading for the case
in which one user executes:

 conntrack -E

So far, this resulted in nfnetlink loaded, but not
nf_conntrack_netlink.

I have received in the past many complains on this behaviour.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 6085e4919cb3..f74dd133788f 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -179,6 +179,7 @@ struct netlink_kernel_cfg {
         unsigned int    groups;
         void            (*input)(struct sk_buff *skb);
         struct mutex    *cb_mutex;
+        void            (*bind)(int group);
 };
 
 extern struct sock *netlink_kernel_create(struct net *net, int unit,