blob: 4ecc8cb1cf97b67001b7feb9299efe7b1bb0013f [file] [log] [blame]
// Copyright 2011 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.
// +build darwin dragonfly freebsd netbsd openbsd
package net
import (
func setDefaultSockopts(s, family, sotype int, ipv6only bool) error {
if runtime.GOOS == "dragonfly" && sotype != syscall.SOCK_RAW {
// On DragonFly BSD, we adjust the ephemeral port
// range because unlike other BSD systems its default
// port range doesn't conform to IANA recommendation
// as described in RFC 6056 and is pretty narrow.
switch family {
case syscall.AF_INET:
syscall.SetsockoptInt(s, syscall.IPPROTO_IP, syscall.IP_PORTRANGE, syscall.IP_PORTRANGE_HIGH)
case syscall.AF_INET6:
syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_PORTRANGE, syscall.IPV6_PORTRANGE_HIGH)
if supportsIPv4map() && 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.
return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1))
func setDefaultListenerSockopts(s int) error {
// Allow reuse of recently-used addresses.
return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
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)
// Allow reuse of recently-used ports.
// This option is supported only in descendants of 4.4BSD,
// to make an effective multicast application that requires
// quick draw possible.
return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 1))