@@ -1044,6 +1044,61 @@ 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(NLMSG_DEFAULT_SIZE, 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, sock_net(peer->sock->sock->sk),
+ msg, 0, OVPN_NLGRP_PEERS, GFP_KERNEL);
+
+ 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_ */
@@ -995,6 +995,7 @@ static void ovpn_peer_remove(struct ovpn_peer *peer,
}
peer->delete_reason = reason;
+ ovpn_nl_peer_del_notify(peer);
if (peer->sock)
ovpn_socket_put(peer->sock);
Whenever a peer is deleted, send a notification to userspace so that it can react accordingly. This is most important when a peer is deleted due to ping timeout, because it all happens in kernelspace and thus userspace has no direct way to learn about it. Signed-off-by: Antonio Quartulli <antonio@openvpn.net> --- drivers/net/ovpn/netlink.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/net/ovpn/netlink.h | 1 + drivers/net/ovpn/peer.c | 1 + 3 files changed, 57 insertions(+)