func joinIPv6Group(fd int, ifi *net.Interface, grp net.IP) error {
mreq := syscall.IPv6Mreq{}
copy(mreq.Multiaddr[:], grp)
if ifi != nil {
mreq.Interface = uint32(ifi.Index)
}
return os.NewSyscallError("setsockopt", syscall.SetsockoptIPv6Mreq(fd, ianaProtocolIPv6, syscall.IPV6_JOIN_GROUP, &mreq))
}
func leaveIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
mreq := &syscall.IPv6Mreq{}
copy(mreq.Multiaddr[:], ip)
if ifi != nil {
mreq.Interface = uint32(ifi.Index)
}
fd.incref()
defer fd.decref()
return os.NewSyscallError("setsockopt", syscall.SetsockoptIPv6Mreq(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_LEAVE_GROUP, mreq))
}
func leaveIPv6GroupUDP(c *UDPConn, ifi *Interface, ip IP) error {
mreq := &syscall.IPv6Mreq{}
copy(mreq.Multiaddr[:], ip)
if ifi != nil {
mreq.Interface = uint32(ifi.Index)
}
if err := os.NewSyscallError("setsockopt", syscall.SetsockoptIPv6Mreq(c.fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_LEAVE_GROUP, mreq)); err != nil {
return &OpError{"leaveipv6group", "udp", &IPAddr{ip}, err}
}
return nil
}
func joinIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
mreq := &syscall.IPv6Mreq{}
copy(mreq.Multiaddr[:], ip)
if ifi != nil {
mreq.Interface = uint32(ifi.Index)
}
if err := fd.incref(false); err != nil {
return err
}
defer fd.decref()
return os.NewSyscallError("setsockopt", syscall.SetsockoptIPv6Mreq(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq))
}
// JoinMulticastIPv6 joins the multicast group address given by gaddr. laddr specifies which
// network interface to use when joining the group.
func JoinMulticastIPv6(c *net.IPConn, gaddr, laddr net.IP) error {
f, err := c.File()
if err != nil {
return err
}
defer f.Close()
mreq := &syscall.IPv6Mreq{}
copy(mreq.Multiaddr[:], gaddr.To16())
iface, err := findInterface(laddr)
if err != nil {
return err
}
mreq.Interface = uint32(iface.Index)
err = syscall.SetsockoptIPv6Mreq(int(f.Fd()), syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq)
if err != nil {
return err
}
return nil
}