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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
//go:build linux
package udprelay
import (
"net"
"syscall"
"golang.org/x/sys/unix"
)
func trySetReusePort(_ string, _ string, c syscall.RawConn) {
c.Control(func(fd uintptr) {
unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
})
}
func isReusableSocket(uc *net.UDPConn) bool {
rc, err := uc.SyscallConn()
if err != nil {
return false
}
var reusable bool
rc.Control(func(fd uintptr) {
val, err := unix.GetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT)
if err == nil && val == 1 {
reusable = true
}
})
return reusable
}
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