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(+)
diff --git a/drivers/net/ovpn/netlink.c b/drivers/net/ovpn/netlink.c index 355cd3aa4849b518bc794152e6d9d0bce7ed0f6b..20e9d6b5e92c2647b00f8d50f508b5b1bd8d83d2 100644 --- a/drivers/net/ovpn/netlink.c +++ b/drivers/net/ovpn/netlink.c @@ -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 diff --git a/drivers/net/ovpn/netlink.h b/drivers/net/ovpn/netlink.h index 33390b13c8904d40b629662005a9eb92ff617c3b..4ab3abcf23dba11f6b92e3d69e700693adbc671b 100644 --- a/drivers/net/ovpn/netlink.h +++ b/drivers/net/ovpn/netlink.h @@ -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_ */ diff --git a/drivers/net/ovpn/peer.c b/drivers/net/ovpn/peer.c index 86caac747c6173672e4d3294639f60cd4138ac43..513b738364b9281861ea6b83a6330e78cbea5f4f 100644 --- a/drivers/net/ovpn/peer.c +++ b/drivers/net/ovpn/peer.c @@ -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);