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use std::io;
use talpid_windows::net::{AddressFamily, get_ip_interface_entry, set_ip_interface_entry};
use windows_sys::Win32::{
Foundation::ERROR_NOT_FOUND, NetworkManagement::Ndis::NET_LUID_LH,
Networking::WinSock::RouterDiscoveryDisabled,
};
/// Sets MTU, metric, and disables unnecessary features for the IP interfaces
/// on the specified network interface (identified by `luid`).
pub fn initialize_interfaces(
luid: NET_LUID_LH,
ipv4_mtu: Option<u32>,
ipv6_mtu: Option<u32>,
) -> io::Result<()> {
for (family, mtu) in &[
(AddressFamily::Ipv4, ipv4_mtu),
(AddressFamily::Ipv6, ipv6_mtu),
] {
let mut row = match get_ip_interface_entry(*family, &luid) {
Ok(row) => row,
Err(error) if error.raw_os_error() == Some(ERROR_NOT_FOUND as i32) => continue,
Err(error) => return Err(error),
};
if let Some(mtu) = mtu {
row.NlMtu = *mtu;
}
// Disable DAD, DHCP, and router discovery
row.SitePrefixLength = 0;
row.RouterDiscoveryBehavior = RouterDiscoveryDisabled;
row.DadTransmits = 0;
row.ManagedAddressConfigurationSupported = false;
row.OtherStatefulConfigurationSupported = false;
// Ensure lowest interface metric
row.Metric = 1;
row.UseAutomaticMetric = false;
set_ip_interface_entry(&mut row)?;
}
Ok(())
}
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