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.
5 //go:build unix || windows
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 {
19 err := fd.pfd.SetsockoptIPMreq(syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq)
21 return wrapSyscallError("setsockopt", err)
24 func setIPv6MulticastInterface(fd *netFD, ifi *Interface) error {
29 err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_IF, v)
31 return wrapSyscallError("setsockopt", err)
34 func setIPv6MulticastLoopback(fd *netFD, v bool) error {
35 err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP, boolint(v))
37 return wrapSyscallError("setsockopt", err)
40 func joinIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
41 mreq := &syscall.IPv6Mreq{}
42 copy(mreq.Multiaddr[:], ip)
44 mreq.Interface = uint32(ifi.Index)
46 err := fd.pfd.SetsockoptIPv6Mreq(syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq)
48 return wrapSyscallError("setsockopt", err)