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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix || windows
package net
import (
"runtime"
"syscall"
)
func joinIPv4Group(fd *netFD, ifi *Interface, ip IP) error {
mreq := &syscall.IPMreq{Multiaddr: [4]byte{ip[0], ip[1], ip[2], ip[3]}}
if err := setIPv4MreqToInterface(mreq, ifi); err != nil {
return err
}
err := fd.pfd.SetsockoptIPMreq(syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq)
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}
func setIPv6MulticastInterface(fd *netFD, ifi *Interface) error {
var v int
if ifi != nil {
v = ifi.Index
}
err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_IF, v)
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}
func setIPv6MulticastLoopback(fd *netFD, v bool) error {
err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP, boolint(v))
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}
func joinIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
mreq := &syscall.IPv6Mreq{}
copy(mreq.Multiaddr[:], ip)
if ifi != nil {
mreq.Interface = uint32(ifi.Index)
}
err := fd.pfd.SetsockoptIPv6Mreq(syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq)
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}
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