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 | 65 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/net/ovpn/netlink.h | 1 + drivers/net/ovpn/peer.c | 1 + 3 files changed, 67 insertions(+)
diff --git a/drivers/net/ovpn/netlink.c b/drivers/net/ovpn/netlink.c index 0838b65212aa4b077a8ecb0b21807f886a397193..efe787b15c9d9d6271da670506b5e6396f744e37 100644 --- a/drivers/net/ovpn/netlink.c +++ b/drivers/net/ovpn/netlink.c @@ -1094,6 +1094,71 @@ 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 ovpn_socket *sock; + 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); + + rcu_read_lock(); + sock = rcu_dereference(peer->sock); + if (!sock) { + ret = -EINVAL; + goto err_unlock; + } + genlmsg_multicast_netns(&ovpn_nl_family, sock_net(sock->sock->sk), + msg, 0, OVPN_NLGRP_PEERS, GFP_ATOMIC); + rcu_read_unlock(); + + return 0; + +err_unlock: + rcu_read_unlock(); +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 5dc84c8e5e803014053faa0d892fc3a7259d40e5..8615dfc3c4720a2a550b5cd1a8454ccc58a3c6ba 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 cfe5396da584fb2b6ecbd84cd9b65446e123b6f3..b3cbe070bdfe2d129fb4b8f94401004b55cf32d5 100644 --- a/drivers/net/ovpn/peer.c +++ b/drivers/net/ovpn/peer.c @@ -689,6 +689,7 @@ static void ovpn_peer_remove(struct ovpn_peer *peer, }
peer->delete_reason = reason; + ovpn_nl_peer_del_notify(peer);
/* append to provided list for later socket release and ref drop */ llist_add(&peer->release_entry, release_list);