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 // +build darwin dragonfly freebsd linux netbsd openbsd windows 6 7 package net 8 9 import ( 10 "os" 11 "syscall" 12 ) 13 14 func joinIPv4Group(fd *netFD, ifi *Interface, ip IP) error { 15 mreq := &syscall.IPMreq{Multiaddr: [4]byte{ip[0], ip[1], ip[2], ip[3]}} 16 if err := setIPv4MreqToInterface(mreq, ifi); err != nil { 17 return err 18 } 19 if err := fd.incref(); err != nil { 20 return err 21 } 22 defer fd.decref() 23 return os.NewSyscallError("setsockopt", syscall.SetsockoptIPMreq(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq)) 24 } 25 26 func setIPv6MulticastInterface(fd *netFD, ifi *Interface) error { 27 var v int 28 if ifi != nil { 29 v = ifi.Index 30 } 31 if err := fd.incref(); err != nil { 32 return err 33 } 34 defer fd.decref() 35 return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_IF, v)) 36 } 37 38 func setIPv6MulticastLoopback(fd *netFD, v bool) error { 39 if err := fd.incref(); err != nil { 40 return err 41 } 42 defer fd.decref() 43 return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP, boolint(v))) 44 } 45 46 func joinIPv6Group(fd *netFD, ifi *Interface, ip IP) error { 47 mreq := &syscall.IPv6Mreq{} 48 copy(mreq.Multiaddr[:], ip) 49 if ifi != nil { 50 mreq.Interface = uint32(ifi.Index) 51 } 52 if err := fd.incref(); err != nil { 53 return err 54 } 55 defer fd.decref() 56 return os.NewSyscallError("setsockopt", syscall.SetsockoptIPv6Mreq(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq)) 57 } 58
