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
