diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index f7dcd2c..8a64b81 100644
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -20,6 +20,9 @@
 	u32			id;
 };
 
+struct genl_ops;
+struct genl_info;
+
 /**
  * struct genl_family - generic netlink family
  * @id: protocol family idenfitier
@@ -29,6 +32,10 @@
  * @maxattr: maximum number of attributes supported
  * @netnsok: set to true if the family can handle network
  *	namespaces and should be presented in all of them
+ * @pre_doit: called before an operation's doit callback, it may
+ *	do additional, common, filtering and return an error
+ * @post_doit: called after an operation's doit callback, it may
+ *	undo operations done by pre_doit, for example release locks
  * @attrbuf: buffer to store parsed attributes
  * @ops_list: list of all assigned operations
  * @family_list: family list
@@ -41,6 +48,12 @@
 	unsigned int		version;
 	unsigned int		maxattr;
 	bool			netnsok;
+	int			(*pre_doit)(struct genl_ops *ops,
+					    struct sk_buff *skb,
+					    struct genl_info *info);
+	void			(*post_doit)(struct genl_ops *ops,
+					     struct sk_buff *skb,
+					     struct genl_info *info);
 	struct nlattr **	attrbuf;	/* private */
 	struct list_head	ops_list;	/* private */
 	struct list_head	family_list;	/* private */
@@ -55,6 +68,8 @@
  * @genlhdr: generic netlink message header
  * @userhdr: user specific header
  * @attrs: netlink attributes
+ * @_net: network namespace
+ * @user_ptr: user pointers
  */
 struct genl_info {
 	u32			snd_seq;
@@ -66,6 +81,7 @@
 #ifdef CONFIG_NET_NS
 	struct net *		_net;
 #endif
+	void *			user_ptr[2];
 };
 
 static inline struct net *genl_info_net(struct genl_info *info)
@@ -81,6 +97,7 @@
 /**
  * struct genl_ops - generic netlink operations
  * @cmd: command identifier
+ * @internal_flags: flags used by the family
  * @flags: flags
  * @policy: attribute validation policy
  * @doit: standard command callback
@@ -90,6 +107,7 @@
  */
 struct genl_ops {
 	u8			cmd;
+	u8			internal_flags;
 	unsigned int		flags;
 	const struct nla_policy	*policy;
 	int		       (*doit)(struct sk_buff *skb,
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 26ed3e8..1781d99 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -547,8 +547,20 @@
 	info.userhdr = nlmsg_data(nlh) + GENL_HDRLEN;
 	info.attrs = family->attrbuf;
 	genl_info_net_set(&info, net);
+	memset(&info.user_ptr, 0, sizeof(info.user_ptr));
 
-	return ops->doit(skb, &info);
+	if (family->pre_doit) {
+		err = family->pre_doit(ops, skb, &info);
+		if (err)
+			return err;
+	}
+
+	err = ops->doit(skb, &info);
+
+	if (family->post_doit)
+		family->post_doit(ops, skb, &info);
+
+	return err;
 }
 
 static void genl_rcv(struct sk_buff *skb)