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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package net
import (
"os"
"syscall"
)
func setDefaultSockopts(s, family, sotype int, ipv6only bool) error {
if family == syscall.AF_INET6 && sotype != syscall.SOCK_RAW {
// Allow both IP versions even if the OS default
// is otherwise. Note that some operating systems
// never admit this option.
syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only))
}
// Allow broadcast.
if err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1); err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}
func setDefaultListenerSockopts(s int) error {
// Allow reuse of recently-used addresses.
if err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}
func setDefaultMulticastSockopts(s int) error {
// Allow multicast UDP and raw IP datagram sockets to listen
// concurrently across multiple listeners.
if err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}
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