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      1 // Copyright 2011 The Go Authors.  All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package net
      6 
      7 import (
      8 	"os"
      9 	"syscall"
     10 )
     11 
     12 func setDefaultSockopts(s, family, sotype int, ipv6only bool) error {
     13 	if family == syscall.AF_INET6 && sotype != syscall.SOCK_RAW {
     14 		// Allow both IP versions even if the OS default
     15 		// is otherwise.  Note that some operating systems
     16 		// never admit this option.
     17 		syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only))
     18 	}
     19 	// Allow broadcast.
     20 	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1))
     21 }
     22 
     23 func setDefaultListenerSockopts(s int) error {
     24 	// Allow reuse of recently-used addresses.
     25 	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
     26 }
     27 
     28 func setDefaultMulticastSockopts(s int) error {
     29 	// Allow multicast UDP and raw IP datagram sockets to listen
     30 	// concurrently across multiple listeners.
     31 	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
     32 }
     33