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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
//go:build linux
package prober
import (
"fmt"
"net/netip"
"github.com/tailscale/netlink"
"go4.org/netipx"
)
const tunName = "derpprobe"
func configureTUN(addr netip.Prefix, tunname string) error {
link, err := netlink.LinkByName(tunname)
if err != nil {
return fmt.Errorf("failed to look up link %q: %w", tunname, err)
}
// We need to bring the TUN device up before assigning an address. This
// allows the OS to automatically create a route for it. Otherwise, we'd
// have to manually create the route.
if err := netlink.LinkSetUp(link); err != nil {
return fmt.Errorf("failed to bring tun %q up: %w", tunname, err)
}
if err := netlink.AddrReplace(link, &netlink.Addr{IPNet: netipx.PrefixIPNet(addr)}); err != nil {
return fmt.Errorf("failed to add address: %w", err)
}
return nil
}
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