Function tap_subnet_from_host_ip

crates/openshell-driver-vm/src/runtime.rs:534–543

(host_ip: &str)

}

fn tap_subnet_from_host_ip(host_ip: &str) -> String {
    host_ip.parse::<std::net::Ipv4Addr>().map_or_else(
        |_| format!("{host_ip}/30"),
        |ip| {
            let base = u32::from(ip) & !3;
            let base_ip = std::net::Ipv4Addr::from(base);
            format!("{base_ip}/30")
        },
    )
}

fn enable_ip_forwarding() -> Result<(), String> {
    std::fs::write("/proc/sys/net/ipv4/ip_forward", "1")