IPV6_RTHDR
SOCKET_OPTION_INFO_ENTRY(IPPROTO_IPV6, IPV6_RTHDR),
setsockopt(dummy, IPPROTO_IPV6, IPV6_RTHDR,
case IPV6_RTHDR:
if (setsockopt(srecv, IPPROTO_IPV6, IPV6_RTHDR, &opton,
scmsgp->cmsg_type = IPV6_RTHDR;
*optp = IPV6_RTHDR;