IPV6_2292RTHDR
if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, len, rthdr);
case IPV6_2292RTHDR:
case IPV6_2292RTHDR:
case IPV6_2292RTHDR:
case IPV6_2292RTHDR: