added IP6OPT_NSAP_ADDR, IP6OPT_TUNNEL_LIMIT, and IP6OPT_ROUTER_ALERT, which are defined in 2292bis-01.
added IP6OPT_NSAP_ADDR, IP6OPT_TUNNEL_LIMIT, and IP6OPT_ROUTER_ALERT,
which are defined in 2292bis-01.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame