void JoinGroupV6(IPAddress group, uint ifindex)
{
System.Diagnostics.Debug.Assert(_socket.Handle != IntPtr.Zero);
System.Diagnostics.Debug.Assert(group.AddressFamily == AddressFamily.InterNetworkV6);
System.Diagnostics.Debug.Assert(ifindex != 0);
if (_localIp == IPAddress.IPv6Any)
{
return;
}
IntPtr ptr = new IntPtr(ifindex);
ipv6_mreq mr = new ipv6_mreq()
{
ipv6mr_multiaddr = group.GetAddressBytes(),
ipv6mr_interface = ptr
};
int ret = setsockopt(_socket.Handle.ToInt32(), IPPROTO_IPV6, IPV6_JOIN_GROUP, ref mr, Marshal.SizeOf(mr));
if (ret != 0)
{
throw new PeachException("Error, failed to join group '{0}' on interface '{1}', error {2}.".Fmt(group, _iface, ret));
}
ret = setsockopt(_socket.Handle.ToInt32(), IPPROTO_IPV6, IPV6_MULTICAST_IF, ref ptr, Marshal.SizeOf(typeof(IntPtr)));
if (ret != 0)
{
throw new PeachException("Error, failed to set outgoing interface to '{1}' for group '{0}', error {2}.".Fmt(group, _iface, ret));
}
}
static extern int setsockopt(int socket, int level, int optname, ref ipv6_mreq opt, int optlen);
