MRT6_INIT
if (setsockopt(s, IPPROTO_IPV6, MRT6_INIT, &value, sizeof(value)) == -1)
case MRT6_INIT:
if (cmd != MRT6_INIT && so != ip6_mrouter[inp->inp_rtableid])
case MRT6_INIT:
case MRT6_INIT: