route: handle default gateway (net_gateway) and nexthop towards VPN server separately

route: handle default gateway (net_gateway) and nexthop towards VPN server separately

Right now there is the assumption that the gateway used for net_gateway is the same used to reach the VPN server.
However, these two gateways may be different (i.e. when there is a specific hostroute for the VPN server using a different nexthop).
For this reason we must adapt init_route_list() to fetch the two gateways separately.

Github: fixes OpenVPN/openvpn#890

Change-Id: I16d90221d0a75193035253817ff195f6da9dc0b3
Signed-off-by: Marco Baffo <marco@mandelbit.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1222
Message-Id: <20251119114041.17665-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg34529.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>