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 aix darwin dragonfly freebsd linux netbsd openbsd solaris windows
6
7package net
8
9import (
10	"runtime"
11	"syscall"
12)
13
14func 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	err := fd.pfd.SetsockoptIPMreq(syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq)
20	runtime.KeepAlive(fd)
21	return wrapSyscallError("setsockopt", err)
22}
23
24func setIPv6MulticastInterface(fd *netFD, ifi *Interface) error {
25	var v int
26	if ifi != nil {
27		v = ifi.Index
28	}
29	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_IF, v)
30	runtime.KeepAlive(fd)
31	return wrapSyscallError("setsockopt", err)
32}
33
34func setIPv6MulticastLoopback(fd *netFD, v bool) error {
35	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP, boolint(v))
36	runtime.KeepAlive(fd)
37	return wrapSyscallError("setsockopt", err)
38}
39
40func joinIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
41	mreq := &syscall.IPv6Mreq{}
42	copy(mreq.Multiaddr[:], ip)
43	if ifi != nil {
44		mreq.Interface = uint32(ifi.Index)
45	}
46	err := fd.pfd.SetsockoptIPv6Mreq(syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq)
47	runtime.KeepAlive(fd)
48	return wrapSyscallError("setsockopt", err)
49}
50