In MP mode, ovpn uses peer VPN addresses as lookup keys for selecting
the peer that should receive outgoing tunnel packets. The netlink
configuration path currently accepts address values that cannot sensibly
identify a VPN peer, such as multicast, broadcast or loopback addresses.
Reject invalid peer VPN addresses when creating or updating an MP peer.
Keep accepting the unspecified address as the internal unset value,
provided that at least one VPN address family remains configured.
Fixes: 1d36a36f6d ("ovpn: implement peer add/get/dump/delete via netlink")
Signed-off-by: Ralf Lici <ralf@mandelbit.com>
Signed-off-by: Antonio Quartulli <antonio@openvpn.net>
5940f3407b