[PATCH net-next v10 21/23] ovpn: notify userspace when a peer is deleted

@@ -999,6 +999,61 @@ int ovpn_nl_key_del_doit(struct sk_buff *skb, struct genl_info *info)
 	return 0;
 }
 
+/**
+ * ovpn_nl_peer_del_notify - notify userspace about peer being deleted
+ * @peer: the peer being deleted
+ *
+ * Return: 0 on success or a negative error code otherwise
+ */
+int ovpn_nl_peer_del_notify(struct ovpn_peer *peer)
+{
+	struct sk_buff *msg;
+	struct nlattr *attr;
+	int ret = -EMSGSIZE;
+	void *hdr;
+
+	netdev_info(peer->ovpn->dev, "deleting peer with id %u, reason %d\n",
+		    peer->id, peer->delete_reason);
+
+	msg = nlmsg_new(100, GFP_ATOMIC);
+	if (!msg)
+		return -ENOMEM;
+
+	hdr = genlmsg_put(msg, 0, 0, &ovpn_nl_family, 0, OVPN_CMD_PEER_DEL_NTF);
+	if (!hdr) {
+		ret = -ENOBUFS;
+		goto err_free_msg;
+	}
+
+	if (nla_put_u32(msg, OVPN_A_IFINDEX, peer->ovpn->dev->ifindex))
+		goto err_cancel_msg;
+
+	attr = nla_nest_start(msg, OVPN_A_PEER);
+	if (!attr)
+		goto err_cancel_msg;
+
+	if (nla_put_u8(msg, OVPN_A_PEER_DEL_REASON, peer->delete_reason))
+		goto err_cancel_msg;
+
+	if (nla_put_u32(msg, OVPN_A_PEER_ID, peer->id))
+		goto err_cancel_msg;
+
+	nla_nest_end(msg, attr);
+
+	genlmsg_end(msg, hdr);
+
+	genlmsg_multicast_netns(&ovpn_nl_family, dev_net(peer->ovpn->dev), msg,
+				0, OVPN_NLGRP_PEERS, GFP_ATOMIC);
+
+	return 0;
+
+err_cancel_msg:
+	genlmsg_cancel(msg, hdr);
+err_free_msg:
+	nlmsg_free(msg);
+	return ret;
+}
+
 /**
  * ovpn_nl_key_swap_notify - notify userspace peer's key must be renewed
  * @peer: the peer whose key needs to be renewed

@@ -12,6 +12,7 @@
 int ovpn_nl_register(void);
 void ovpn_nl_unregister(void);
 
+int ovpn_nl_peer_del_notify(struct ovpn_peer *peer);
 int ovpn_nl_key_swap_notify(struct ovpn_peer *peer, u8 key_id);
 
 #endif /* _NET_OVPN_NETLINK_H_ */

@@ -242,6 +242,7 @@ void ovpn_peer_release_kref(struct kref *kref)
 {
 	struct ovpn_peer *peer = container_of(kref, struct ovpn_peer, refcount);
 
+	ovpn_nl_peer_del_notify(peer);
 	ovpn_peer_release(peer);
 }