IPV6_TCLASS
IPV6_TCLASS, IPPROTO_IPV6);
case IPV6_TCLASS:
case IPV6_TCLASS:
case IPV6_TCLASS:
if (optname == -1 || optname == IPV6_TCLASS)
case IPV6_TCLASS:
case IPV6_TCLASS:
IPV6_TCLASS, &Tflag, sizeof(Tflag)) == -1)