genetlink: add auto module loading

When testing L2TP support, I discovered that the l2tp module is not autoloaded
as are other netlink interfaces. There is because of lack of hook in genetlink to call
request_module and load the module.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 21a82410ec7c..a403b618faa5 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -792,6 +792,15 @@ static int ctrl_getfamily(struct sk_buff *skb, struct genl_info *info)
 
                 name = nla_data(info->attrs[CTRL_ATTR_FAMILY_NAME]);
                 res = genl_family_find_byname(name);
+#ifdef CONFIG_MODULES
+                if (res == NULL) {
+                        genl_unlock();
+                        request_module("net-pf-%d-proto-%d-type-%s",
+                                       PF_NETLINK, NETLINK_GENERIC, name);
+                        genl_lock();
+                        res = genl_family_find_byname(name);
+                }
+#endif
                 err = -ENOENT;
         }