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 if (sotype == syscall.SOCK_DGRAM || sotype == syscall.SOCK_RAW) && family != syscall.AF_UNIX {
20 // Allow broadcast.
21 return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1))
22 }
23 return nil
24 }
25 26 func setDefaultListenerSockopts(s int) error {
27 // Allow reuse of recently-used addresses.
28 return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
29 }
30 31 func setDefaultMulticastSockopts(s int) error {
32 // Allow multicast UDP and raw IP datagram sockets to listen
33 // concurrently across multiple listeners.
34 return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
35 }
36